DE3205140A1 - Method for generating a calibrated clock circuit, and clock circuit calibrated in accordance with the method - Google Patents

Abstract

The aim of the method and of a clock circuit (1) calibrated in accordance with this method is an inexpensive method product which can be installed directly into a clock mechanism. For this purpose, integrated calibration capacitors are connected, at the base of the integrated circuit (19) on conductor frames (18), to the integrated oscillator, as determined by the size and distribution of the deviation from natural resonance of a ready-to-install batch of stored crystal resonators (7) which are later inserted into a recess (5) of an injection-moulded body (2) where they are connected to the conductor frames (18), in such a manner that the circuit oscillators have approximately the same deviations from the operating frequency required later as the frequency of the ready-to-install frequency-classified crystal resonators (7), but with the opposite sign from these. Finally, each circuit (19) is equipped with the crystal resonator (7) of opposite frequency deviation. This provides a series of circuits (1) which are permanently calibrated to the operating frequency without further calibration requirements and without having to maintain a costly store with types of defined natural resonance for the crystal resonators (7). The circuit (1) thus calibrated can be inserted directly, that is to say without requiring a separate circuit board to be installed due to the lack of external calibration components, into a clock mechanism and mounted on a suitable clock mechanism component. <IMAGE>

Description

Procedure for creating a matched

Clock circuit and according to the method balanced clock circuit The invention relates to a method according to the preamble of claim 1 and a circuit according to the preamble of claim 3.

Such a method and such a circuit are from GB-PS 1 381 996 known. There the circuit is built on a base plate9 the thick-film line connections between an integrated circuit for an oscillator with a downstream divider circuit and motor driver output stage on the one hand and on the other hand a tuning fork oscillating quartz manufactured using etching technology to stabilize the oscillator oscillation frequency. The oscillation adjustment of the oscillator takes place by means of the step-by-step connection of trimming capacities, which are also made using thick-film technology, namely with capacitor coatings which are applied to both sides of the circuit base plate; being on the outer surface of the base plate freely accessible partial coverings afterwards applied conductive layers can be connected to one another and thus for the balancing capacitance are effectively switchable. In addition, the natural resonance frequency of the Quarzesp namely by evaporation of damping mass by means of a laser beam; for this, the circuit structure on the base plate is surrounded by a housing, which is at least locally transparent to laser beams.

This previously known frequency-adjusted clock circuit or the Procedures for its adjustment have different for the concerns of the practical Usefulness of such a circuit on detrimental properties. To this include the comparatively large dimensions for the circuit structure inside of the housing bulging over the base plate and the high costs of manufacturing the housing taking into account the possibility of laser calibration inside the housing. Disadvantageous is in particular the one to be made by conductive layers outside the housing Capacitor adjustment to adjust the oscillator frequency, because mechanical impact influences or environmental influences lead to a subsequent change in this comparison; th can lead. Finally, the frequency adjustment must be carried out independently of one another on the one hand the oscillator and on the other hand the quartz oscillator expensive, especially since the use of automatic balancing devices due to the very different and acting on completely different areas of the circuit Adjustment requirements at least made more difficult and in addition to the costs of a laser adjustment device becomes more expensive.

From DE-PS 29 31 357 a generic balanced clock circuit is or a method for its production is known in which in a recess in the Injection molded body that connects the mechanically and electrically connected to a lead frame Integrated circuit encased as a housing, also a laser-adjustable oscillating crystal is used. A balance of the oscillator circuit within the integrated Circuit is not provided. Here, too, the outlay on equipment is disadvantageous for the formation of an optically transparent-from equal window above the in quartz crystal inserted into the recess and for the laser adjustment of the oscillating quartz self; especially since such laser-adjustable oscillating crystals are not commercially available, so no optional recourse to different providers depending on the current one Market conditions is possible.

Another generic, adjustable clock circuit is from DE-GM 80 29 184 known. There the integrated circuit has a plurality of matching connection compartments, which are connected to a grid of conductor tracks are, which are used for frequency adjustment when inserted into a housing recess and quartz oscillator connected to the oscillating gate circuit for the adjustment process are to be separated selectively. This intervenes in the operation of the the oscillator downstream frequency divider circuit, so that regardless of the Oscillator frequency at the motor driver output the desired pulse repetition frequency for the stepper motor control, i.e. for driving an electromechanical converter occurs in the clockwork. One of the decisive disadvantages of this and similar comparison procedures, which are based on an intervention in the divider ratio is, in particular, that the Oscillator output frequency is no longer a measure of the accuracy of the watch. Of the The factory manufacturer can no longer use the conventional measuring and testing equipment use, but must make extraordinary investments to ensure the accuracy to be determined from the low-frequency pulse train at the motor driver output; whereby this determination usually takes a long time, in the automated production process in the Usually requires measurement periods that cannot be implemented at all, because depending on the intervention in the frequency divider behavior correcting motor pulse blanking only after one Large number of motor control periods with incorrect frequency occur in order to then on average only to achieve the desired time-keeping motor control.

Because of these drawbacks, previously known ways of creating matched Clock circuits have already been calibrated on the market without any further calibration requirements directly usable clock circuits (as so-called "building blocks") not yet enforce or even gain a noteworthy market share.

Rather, it is still completely common to be laminated on one with Printed circuit board equipped with a pre-balanced circuit a vibration-stabilizing quartz crystal with connection of a compensation capacitor interconnect, which is usually a mechanical trimmer or is a ceramic capacitor that can be capacitated by mechanical abrasion. Such a circuit board for electrical interconnection with mechanical However, holding the individual components is expensive to manufacture, assemble and test and installation as well as space-consuming in the workshop; also leaves the long-term stability of the adjustment to the desired operating frequency left something to be desired, since the set Capacity of such balancing capacitors from environmental influences such as in particular the Humidity and ambient temperature can be changed; being in the case of the mechanical Trimmers still add the shock sensitivity of the contact. Disadvantageous with this previous use of electronic blocks to be mounted on printed circuit boards with a circuit to be matched by an additional external circuit, that the latter have at least one connection accessible for the adjustment must, which has an adverse effect on the manufacturing costs and the installation effort.

It is an object of the invention to recognize these given deficiencies based on the generic method or

to develop the generic circuit to the effect that an immediate - without any subsequent bearable matching requirements - usable and therefore not to be wired by additional discrete components High frequency accuracy circuit results.

This object is essential according to the invention. solved by that the method according to the preamble of claim 1 according to the characterizing Part of claim 1 configured and the circuit according to the preamble of Claim 3 additionally according to the features of the characterizing part of the claim 3 is formed.

The basic idea of this solution is therefore in the way of one another those common in integrated circuit technology and therefore existing Apparatus mastered, bond option implemented over in the integrated circuit Adjusting capacitors to carry out an oscillator adjustment; this balancing does not take place directly on the desired operating frequency, but a misalignment according to existing quartz oscillators classified with regard to their frequency deviation the amount of this frequency deviation is made with the opposite sign will. Since such classifications according to frequency deviations with means of commercially available automatic devices feasible.

control information for the implementation of the bond option can be derived, namely control information p which such a grouping of the integrated adjustment capacitors is active switches that with regard to the oscillator frequency deviation of the encapsulated - but not yet embroidered with quartz - circuits have the same classification As with regard to the oscillating crystals in stock, but with the opposite sign of Frequency deviation, results.

All that is then required is this oscillator frequency deviation to be compensated by the fact that an amount moderately about the same but the quartz oscillator exhibiting the opposite frequency deviation from the classified one Stock is selected and installed, so that the total is exactly the one you want Operating frequency results without the need for subsequent adjustment requirements. By controlling the bond option for the mismatching of the oscillator as required the existing supply of quartz crystals is avoided at the same time that larger Warehouse stocks or extensive organizational measures for warehouse management may be necessary because of the misalignment in accordance with the existing quartz oscillators as a result, all crystals of one made available for the current bonding operation Stock can also be consumed for this production series. Since quartz crystals with a A frequency tolerance of + 15 ppm are readily available on the market only 16 classification levels to sort in steps of 2 ppm frequency deviation to make what a daily rate deviation of only about 0.2 seconds of the movement would correspond - with this already small deviation practically completely compensated for is correspondingly due to the roughly equal but opposite frequency deviation of the bonded balanced oscillator.

Further cost savings through this optimal use of the existing one Inventory of quartz oscillators results from the fact that the cost of production, Assembly, testing and installation of a circuit board, as well as for acquisition and storage the discrete components for adjustment is not required. Instead, according to the invention The building blocks obtained and adjusted in the production process can be installed immediately. The definition can, for example, over wide te, so mechanically stable terminal lugs are carried out directly on extensions of battery contact lugs or at The ends of the bobbins laid on a bobbin winder are soldered or welded on will; because more connections than the two for the power supply and for the motor control has this ready-to-use, fully calibrated clock circuit not on This circuit can also directly with its housing on a clamped or snapped into a suitable structural part of the movement. This increases the possibility of variation with regard to the design of clockworks, in particular in the case of the flat or small version. There is also no need to change the circuit board in the case of further developments or other changes in the work structure, because only another suitable mounting option for this compact, complete in itself Circuit must be determined. Finally, the solution according to the invention very good aging resistance, as this is only due to the aging resistance the quartz crystal itself and the oscillator circuit, both of which are hermetically sealed are encapsulated, is given.

Further features and advantages emerge from the description below one in the drawing greatly enlarged but essentially shown to scale preferred embodiment of the solution according to the invention.

It shows: FIG. 1 the ready-to-use equipped with a quartz oscillator Clock circuit in plan view, FIG. 2 the circuit according to FIG. 1 in sectional view according to section arrow II in Fig. 1, Fig. 3 equipped with the integrated circuit Leadframe for the clock circuit shown in FIG. 1, prior to its pouring and cutting as well as before the final application of the quartz crystal, and Fig. 4 to explain the method according to the invention) for creating the according to the invention Circuit according to FIG. 1, in a simplified function block or machine station representation the sequence of the manufacturing process.

The one shown in plan view in Fig. 1, calibrated and ready-to-install Clock circuit 1 (often also referred to as a module or a building block) consists of a plastic injection molded body 2 rectangular, almost square outline its two narrow sides, parallel to the main plane of the extent of this injection molded body 2, Ue two mutually aligned metallic terminal lugs 3 protrude. In the top surface 4 of the injection molded body 2, an elongated recess 5 is left free, into which an oscillating crystal 7 is inserted from the opening 6 (see FIG. 2), the is encapsulated by a quartz case 8. The cross-sectional profile of the recess bottom 9 (cf. FIG. 2) is adapted to the cross-sectional contour of the quartz housing 8 so that this is a multi-sided mechanical support in the recess 5 and thus unites experiences a secure hold. The plan of the quartz recess 5 has a tapered one Extension 10, are accessible in the conductor track pads 11 on which those from the floor area 1? of the quartz housing 8 protruding quartz connecting wires 13 electrically and mechanically, for example by means of an electrically conductive Adhesive or preferably in the spot welding process, are connected.

In the injection molded body top surface 4 there is also another one Recess 14 is formed in which a strip conductor pad 15, for example for the test probe of a test device mechanically and thus also electrically as a test point (See. Below in connection with Fig. 3) is accessible.

The one from the two opposite narrow sides of the injection molded body 2 protruding pairs of connecting trees 3 have a different free Length to a directional orientation for automatic pick and place machines of the circuit 1 to be handled. These occur for the same reason Terminal lugs 3 preferably not in the cross-sectional center plane of the injection molded body 2 from, but offset from this, so that also with respect to the top surface 4 or the opposite underside is an automatically ascertainable orientation criterion for the automated installation of the circuit 1 is given.

The side walls 16 of the otherwise flat-cuboid circuit injection-molded body 2 are, as can be seen from Fig. 2, slightly roof-shaped, with approximately in the plane of the Terminal lugs 3 extending ridge edge 17, beveled.

After the bonded circuit 19 has been poured in, this cross-sectional configuration is achieved of the injection molded body 2 also improves the demoldability from the injection mold. This also makes it easier for the circuit injection-molded body 2 to fit into the mounting recess can be used in any component, for example a clockwork. This profiling finally also promotes a fastening option by means of elastic against the Side walls 16 pressing or

the ridge edge 17 snap-overlapping retaining clips.

The dimensions of such a circuit-Spritzgußkorpers 2 (ie without taking into account the protruding connection lugs 3) are typically 8 x 10 x 3.3 mm In the case of the quartz oscillator 7 with the cylindrical one shown in cross section from FIG Quartz housing 8 is an approximately 32.768 kHz natural resonance vibrating tuning fork quartz crystal, such as that used in clock circuits is created using etching technology and is commercially available.

The internal structure of the circuit encased by the injection molded body 2 1 results from the cross-sectional view according to FIG. 2 in conjunction with the Representation in Fig. 3. Connected to a lead frame 18 (in Fig. 3 but still not encapsulated) is an integrated circuit19 (usually also as an IC chip designated). A partial area of the lead frame 18 can also be used as a chip carrier receiving area 27 be formed on which the substrate of the integrated circuit 19 is attached, e.g. is stuck on (see below).

From a band-like raw material, which is for example is a nickel iron sheet metal strip 20, is in the etching process or (with larger Production volume) in the punching process is the same as for the present embodiment from Fig. 3 visible configuration of conductor tracks 21 delimited from one another, but with each other through edge connections 22 or auxiliary bridges 23 initially still mechanically connected, knows it as sol; ches from the connection technology with integrated Semiconductor chips is known. The strip conductors have transport holes 25 for the advance of the sheet metal strip 20 and positioning notches 26 for the alignment of the network of conductor tracks 21 in automatic processing stations.

Something from the middle of the network that will later be used by the injection molded body 2 (cf. FIG. 2) enveloped conductor tracks 21 offset is a larger sheet metal strip area 27 delimited, on which the integrated circuit 19 is on top, so after that still accessible bond pads 28 (the so-called pads) before or after Formation of the conductor track configuration attached, e.g., glued on. Four These bond connection surfaces 28 are connected by fine wire connections 29 (so-called wire bonding) with those of the conductor tracks 21 connected to the as the four terminal lugs 3 in the direction of the sheet metal edge strips on both sides 24 to extend. These are terminal lugs 3.1 for the connection a (clock) stepper motor and, opposite these, to the connection lugs 3.2 or; 3.3 for the supply voltage polarities VDD and VSS. Preferably is, as shown, the VDD terminal lug 3.2 via a conductor track 21.2 with the Chip receiving surface 27 mechanically, that is to say also electrically, connected.

For a frequency adjustment of the contained in the integrated circuit 19 Oscillator by means of either switchable or parallel switchable, Capacities formed integrated in the circuit 19 are in the illustrated embodiment three, but preferably more in practical implementation, e.g. four, capacitor pads 30 formed on the integrated circuit 19, while the other capacitor poles are interconnected internally. Wire connections 31 are in accordance with the for the desired Frequency approximates the required capacity, e.g. at supply voltage potential VDD switched, which in the usual training of integrated oscillators a external parallel connection of balancing capacitors to the resonant circuit capacitance is equivalent to. The capacitor wire connections are required for this connection of the adjustment capacitors 31 then only over the edge of the circuit 19 to the adjacent above Chip receiving surface 27 to be placed when this is electrically connected to the terminal lug 3.2 for supply voltage potential VDD is connected - as can be seen from the Geometry of the conductor track 21.2 for the example in Figure 3 results.

Certainly for circuits 1 is the one under consideration here Type, especially for use in clockwork as a time-keeping circuit for the clockwork drive, little- at least one externally accessible test point is formed from which a signal from the impulse processing can be tapped for control purposes or into which a control voltage can be fed in order to enable rapid quality controls the pulse train frequency on the motor control terminal lugs 3.1 up-to-set. In the present example, there is a trap for such a test point on the integrated Circuit 19, a further bond pad 28T is formed from which a further wire connection 29T leads to the test point pad 15, which is shown as an enlarged Area is formed in the course of the net-shaped geometry of the conductor tracks 21.

The conductor tracks 21 run essentially only in one longitudinal half of the (later) circuit 1. In addition, a large-area punching 32 is formed, after the encapsulation with the material for the injection molded body 2 (see. Fig. 2) below the recess opening 6 is so that the quartz housing 8, through the plane of Conductor tracks 2 passing through, can be inserted deep into the injection molded body 2, as can be seen from FIG. Two end on a narrow side of this cut-out 32 of the conductor tracks 21.7 with the mentioned pads 11 for later attachment the quartz connecting wires 13 (see. Fig. 1).

After the integrated circuit 19, e.g. on the lead frame 18, attached and electrically connected to conductor tracks 21 via wire connections 29 is, the injection molding with K plastic takes place in another processing station to form the injection molded body 2 (see. Fig. 2) while keeping the quartz receptacle recess open 5 and the test point recess 14. Because of this plastic cast the individual Conductor tracks 21 of the conductor frame 18 mechanically - but electrically insulated - with one another are firmly connected, the auxiliary bridges 23 can now be separated will, which until then prevented individual conductor tracks 21 from falling out of the latticework, For this separation of the auxiliary bridges 23, these are placed so that they are for a Brodier or punching tool are accessible, so in the area of the recesses 5 or 14 (see Fig. 1), opposite funnel-shaped openings. enable e.g. inserting a counter punch and ejecting punching waste. Simultaneously are, also at the location of the "+" - representation in Fig. 3, the edge connections 22 from Cut off the pre-material edge strip 24, and it only falls with the oscillating quartz 7 circuit 1 to be fitted (see FIG. 1).

The individual manufacturing processes mentioned with reference to FIG -are, taking into account also the adjustment process., in Fig. 4 with regard to symbolically simplified processing stations shown in more detail, where - for all in Intermediate stations provided in production practice, such as test stations in particular have been omitted to simplify the illustration.

The strip-shaped raw material in the form of the leadframe sheet metal strip 20 is unwound from a sheet supply 23. us the sheet metal strip 20 is in a Punching station 34 of Leitorrahmen 18 with the net- or grid-like structure of the Conductor tracks 21 punched free (or etched in the case of smaller production quantities). In a loading and loading station 35, the chips fed from a chip magazine 35, function-tested integrated circuits 19 on the Leiterraha.en receiving surface 27 (see. Fig. 3) glued.

The ready-to-install supply of encapsulated in quartz housing 8 Quartz oscillators 7, which is present in a goods receiving store 37, is with regard to the frequency deviation from the specified operating frequency for the circuit 1 classified, namely preferably divided into 16 quality groups that are mutually exclusive by a friend frequency deviation of 2 ppm (pulses per million) differentiate - realistically assuming that the suppliers Such quartz crystals 7 have a natural resonance frequency tolerance of the supplied crystals of + 15 ppm can easily guarantee.

If, follow the mechanical connection of the integrated Circuit 19 with the lead frame 18, in a bonding station 39 the wire connections 29 (cf. FIG. 3) are produced, the integrated capacitances are made via oscillator matching wire connections 31 activated in such a group that the oscillator oscillation frequency a frequency deviation from the ultimately required operating frequency results, which qualitatively and quantitatively exactly the opposite sign than the crystal frequency deviation which was determined in the frequency measuring device. 38 for the classification. For this Wiring are the balancing wire connections depending on the layout of the circuit 19 placed on conductor tracks 21 associated pads 29, when graphically illustrated embodiments to those for supply voltage potential -vZD; if, for example, the substrate of the circuit 19 is already at this potential, then the capacitor balancing bonding to one of the oscillator conductor tracks 21 can be carried out. An evaluation and control circuit 40 connected downstream of that frequency measuring device 38 transmits the frequency deviation distribution of the ready-to-install quartz oscillator lot to the automatic bonding station 39 for controlling the oscillator adjustment the capacitor wire connections 31 (Fig. 3).

When all bonding processes have been carried out and function-tested, it takes place in a pouring station 41 the formation of the injection molded body 2 (see. Fig. 2) by means of plastic material delivered from a storage tank 42. In a then Punching station 43, the edge connections 22 and auxiliary bridges 23 (see. Fig. 3) separated.

This is followed by a frequency measuring station 44 for the precise determination of the actual Oscillator frequency of the respective (not yet with a stabilizing quartz crystal 7 populated) circuit; because the frequency adjustment by connecting adjustment capacitors is comparatively coarse, because with optional parallel switching of e.g. zero up to three integrated balancing capacitors, only seven balancing stages are possible; and the oscillator frequency preset as a result experiences another one in practice Changes due to the bonding and punching processes and in particular due to the effect of temperature in the case of plastic wrapping to form the circuit housing in the form of the injection-molded body 2.

if thus the actual instantaneous oscillation frequency of the oscillator of the integrated circuit 19 is established in each individual case, becomes a the selection magazine 45 connected downstream of the classifying frequency measuring device 3.n the existing SchrinFcuarze 7 classified by selection is called up, its Natural oscillation frequency as far as possible from the required amount Operating frequency deviates from the current oscillation frequency of the integrated oscillator, but with the opposite sign in this regard. This retrieved quartz 7 is fed to the injection molded body 2 in an assembly station 46 and in its quartz recess 5 inserted, where according to the explanation of FIG. 1, the electrical and mechanical connection of the quartz connecting wires 13 to the associated conductor track connecting surfaces 11 he follows. The result is an immediate, without any further adjustment requirements, usable circuit 1, which is fixed to the specified oscillator Operating frequency is adjusted, since the frequency deviation of the not yet with a quartz oscillator 7 wired oscillator due to the opposite frequency deviation of the selected quartz crystal 7 is compensated.

List of reference symbols "ready-to-install", balanced (clock) circuit s Injection molded body (as the housing of 1) Terminal lugs (outside 23 top surface (of 2) Recess (in 2 to accommodate 7/8) opening (from 5 in 4) quartz crystal (for Stabilization of the time-keeping oscillator operating frequency.) Housing (of 7) Bottom (from 5 to accommodate 8) Extension (from 5 to accommodate 13) conductor track pads (in 10 for 13) floor area (of 8) connecting wires (of 7 through 12) test point recess (in 2) test point connection surface (at 18 in 14) side walls (of 2) ridge edge (lengthways 16 in the plane of 18) lead frame (in 2 for mounting and electrical connection of 19) integrated circuit sheet metal strips (for 18) conductor tracks (formed from 20) Edge connections (from 21 to 24) Auxiliary bridges (between 21-21) Edge strips (from 20 outside 18) transport holes (in 24) positioning notches (in 24 for alignment from 18/27 in automatic processing stations) Recording area (on 18/21 for 19) pads (on 19 for 29) wire connections (between 28 and 21) trim capacitor pads (on 19) capacitor trim wire connections (between 30 and 27) punching (in 18 next to 21 for 7/8 below 5) sheet metal supply (at 20) punching station (for 18/21 from 20) assembly and gluing station (for 19 at 27) Magazine (for 19) Storage (for 7 with 8) Frequency meter (for classification of 7) Bond station (for training 29/31) Evaluation and control circuit (for 39 from 38) Injection station (for 2) storage tank (for feeding 41) punching station (for separating from 18/21 out of 20) Frequency measuring station (for capacitor-balanced integrated Oscillator) selection magazine (for classified 7) assembly station (for equipping with 7/8 in 5/2) Blank page

Claims (10)

Claims;) jMethod for creating an on-operating frequency permanently balanced clock circuit, with stabilized by a quartz oscillator Oscillator in an integrated circuit, through digital oscillator frequency adjustment via adjustment capacitors that can be connected to the oscillator circuit marked that. the integrated circuit with integrated balancing capacitors it is created that this integrated circuit is on a circuit carrier, e.g. in the form of a lead frame, that is attached to a given supply on ready-to-install quartz crystals whose individual frequency deviation from the required one Operating frequency of the circuit is determined that according to this frequency deviation distribution such combinations of the integrated balancing capacitors to the oscillator circuit be connected that there is an approximately equal distribution of the deviations the oscillator frequencies from the required operating frequency, but vice versa Sign, results, and that ultimately each electrically connected to the lead frame integrated circuit is equipped with an oscillating crystal, which is related to the current Oscillator frequency deviation just opposite natural resonance deviation with respect to the required operating frequency. 2. The method according to claim 1, characterized in that the integrated Circuit on a z. ¢ m lead frame trained, chip-receiving surface is attached, which has a conductor track with a circuit terminal lug for Supply voltage potential (VDD) is connected, and that for the adjustment capacitor grouping Bond connections from capacitor pads to this receiving surface in the area be placed laterally next to the integrated circuit. 3. The method according to claim 1, characterized in that for the Adjustment capacitor grouping Bond connections of capacitor pads to be placed on conductor tracks leading to the oscillator connection surfaces. 4. Balanced quartz-stabilized clock circuit (1), in particular created according to the method according to one of claims 1 to 3, with an integrated Circuit (.19), with oscillator, frequency divider and notor driver, with oscillator frequency adjustment capacitors and with a quartz oscillator (7), characterized in that the integrated circuit (19) has single-pole connected integrated balancing capacitors, which on the other hand Can be optionally switched on via bond wire connections (31), and that in a Kalter.ungs recess (5) in the circuit-Spritzgußkdrper (2) an oscillating crystal (7) is used, whose Natural resonance deviation from a required operating frequency of the calibrated Circuit (1) is approximately as large as the oscillator frequency deviation at connected adjustment capacitors of that operating frequency, but in this regard has the opposite sign of the frequency deviation. 5. clock circuit according to claim 4, characterized in that the Bond wire connections (31) for capacitor balancing of capacitor pads (303 run on the circuit (19) to at least one conductor track (21)., The is connected to oscillator pads (28). 6. clock circuit according to claim 4, characterized in that it has a chip receiving surface (27) for the integrated circuit (19) which Via a conductor track (21.2) in one piece with the circuit terminal lug (3.2) for a supply voltage potential (VDD) is formed and next to the integrated Circuit (19) formed bond pads (30) for the connection of adjustment capacitors over the side edge of the integrated circuit (19), for contacting the ends of trim wire connections () 1) 'protrudes. 7. clock circuit according to one of claims 4 to 6, characterizedp that he has only four out of his injection molded body (2) parallel to its main plane and connecting lugs (3) protruding linearly parallel to one another, namely two motor connecting lugs (3.1) and opposite these two voltage supply connection lugs (3.2. And 3.3), having. 8. clock circuit according to one of claims 4 to 7, characterized in that that he has at least one test point in the form of a recess (14) in his injection molded body (2), through which a partial area of the lead frame (18) for the mechanical bracket and electrical connection the poured integrated circuit (19), accessible from outside the injection molded body (2) is. 9. Clock circuit according to one of claims 4 to 8, characterized in that that its injection molded body (2) has side walls (16) which are slightly roof-shaped broken have mutually aligned partial surfaces, bounded by a ridge edge (17) approximately in the plane of the circuit terminal lugs (3) 10. clock circuit according to claim 9, characterized in that the plane of the connecting lugs (3) from the central plane of the injection molded body (2) is offset out and / or in different directions emerging terminal lugs (3.1; 3.2; 3.3) have different lengths.