CN214507373U

CN214507373U - Compatible circuit and circuit board of digital silicon microphone and analog silicon microphone and silicon microphone

Info

Publication number: CN214507373U
Application number: CN202023105758.1U
Authority: CN
Inventors: 常正中; 丁永波
Original assignee: Nanjing Weizhi New Technology Co ltd
Current assignee: Nanjing Weizhi New Technology Co ltd
Priority date: 2020-12-21
Filing date: 2020-12-21
Publication date: 2021-10-26
Anticipated expiration: 2030-12-21

Abstract

The utility model provides a compatible circuit, circuit board and silicon microphone of digital silicon microphone and simulation silicon microphone relates to silicon microphone technical field. The compatible circuit comprises an MIC chip, a power supply pin, a data pin, a clock pin, a channel selection pin and a grounding pin, wherein the MIC chip comprises the power supply pin, the data pin, the clock pin, the channel selection pin and the grounding pin; wherein, the power supply pin is connected to the power supply; the data output end of the digital microphone is connected to the data pin, and the clock signal input end of the digital microphone is connected to the clock pin; the analog signal output end of the analog microphone is connected to the clock pin; both the channel select pin and the ground pin are grounded. According to the technical scheme, the digital silicon microphone and the analog silicon microphone can be compatible on the same PCB design, different configurations can be realized by different BOM components and parts, the product design is simplified, more product configuration forms are provided, and different market requirements are met.

Description

Compatible circuit and circuit board of digital silicon microphone and analog silicon microphone and silicon microphone

Technical Field

The utility model relates to a silicon microphone technical field particularly, relates to a compatible circuit, circuit board and silicon microphone of digital silicon microphone and simulation silicon microphone.

Background

At present, an analog silicon microphone is a pickup device manufactured by a high-performance MEMS element and a precise audio technology, an output signal is an analog audio signal, and the analog silicon microphone has good radio frequency signal interference resistance and is widely applied to equipment such as mobile phones, notebook computers and Bluetooth earphones. The digital silicon microphone is a pickup device which combines an MEMS element and a wide dynamic range ASIC technology on the basis of an analog silicon microphone, an output signal is a PDM (pulse density modulation) digital signal, the digital silicon microphone has the characteristic of high signal-to-noise ratio, and the digital silicon microphone is also widely applied to products such as a tablet, a computer notebook, an AI sound box and the like.

The digital silicon microphone integrates the special ASIC, outputs digital audio signals, can reduce the requirement on audio processing, but has more than twice of manufacturing cost and selling price and even higher price than the analog silicon microphone. The analog silicon microphone has better balance between price and performance, and has good cost performance advantage in some application occasions where the audio processing control IC is integrated with an analog audio input channel.

However, even if the main control IC supports both digital and analog audio inputs, the two PCB designs cannot coexist because the two standard pad designs are completely different, and two different PCB designs must be made for high performance or cost performance optional configurations.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the utility model provides a compatible circuit of digital silicon microphone and simulation silicon microphone and contain circuit board, the silicon microphone of this compatible circuit.

The utility model discloses a realize like this:

a digital silicon microphone and analog silicon microphone compatible circuit, comprising: the MIC chip comprises a power supply pin, a data pin, a clock pin, a channel selection pin and a grounding pin; wherein the power pin is connected to a power supply; a data output end of the digital microphone is connected to the data pin, and a clock signal input end of the digital microphone is connected to the clock pin; the analog signal output end of the analog microphone is connected to the clock pin; the channel selection pin and the ground pin are both grounded.

Further, in the preferred embodiment of the present invention, the ground pin includes a GND1 pin, a GND2 pin, a GND3 pin and a GND4 pin.

Further, in the preferred embodiment of the present invention, a resistor RA2 is connected in series between the clock signal input terminal of the digital microphone and the clock pin.

Further, in the preferred embodiment of the present invention, a resistor RA1 is connected in series between the analog signal output terminal of the analog microphone and the clock pin.

Further, in the preferred embodiment of the present invention, the analog signal output terminal of the analog microphone includes a left channel terminal and a right channel terminal, and the left channel terminal and the right channel terminal are connected in parallel to the resistor RA 1.

Further, in the preferred embodiment of the present invention, a capacitor CA2 is connected in series between the left channel end and the resistor RA1, and a capacitor CA1 is connected in series between the right channel end and the resistor RA 2.

Further, in a preferred embodiment of the present invention, the capacitor CA1 and the capacitor CA2 are both 2 to 2.5 μ F.

The utility model also provides a circuit board, include as above compatible circuit.

The utility model also provides a silicon microphone, include as above the circuit board.

The utility model has the advantages that:

the utility model discloses a compatible circuit that above-mentioned design obtained, during the use, the analog signal that can compatible digital silicon wheat output simultaneously and simulate silicon wheat output on MIC chip mainboard need not design the PCB board of two kinds of differences. The user can be according to the difference of using the scene, selects number digital silicon wheat or simulation silicon wheat when SMT produces the paster, can obtain two kinds of price/performance ratio configuration products, has greatly improved the range of application and the market competition of product.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic circuit diagram of a compatible circuit according to an embodiment of the present invention;

fig. 2 is a design diagram of a front sound output pad of a compatible circuit configuration analog silicon microphone according to an embodiment of the present invention;

fig. 3 is a back sound-emitting pad layout diagram of the silicon microphone with compatible circuit configuration according to the embodiment of the present invention.

Detailed Description

To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the drawings of the embodiments of the present invention are combined to clearly and completely describe the technical solutions of the embodiments of the present invention, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention. Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

Referring to fig. 1 to 3, the present embodiment provides a compatible circuit of a digital silicon microphone and an analog silicon microphone. Fig. 2 is a front pad adjustment diagram of a pseudo silicon microphone, and fig. 3 is a back pad adjustment diagram of the pseudo silicon microphone. In this embodiment, the compatible circuit includes an MIC chip. The MIC chip is provided with a power supply pin VDD, a DATA pin DATA, a clock pin CLK, a channel selection pin LR _ SEL and a grounding pin.

And the power supply pin VDD is connected to a power supply MIC _ VDD and used for supplying power to the chip.

A DATA output DMIC _ DATA of the digital microphone DMIC is connected to the DATA pin DATA, and a clock signal input DMIC _ CLK of the digital microphone DMIC is connected to the clock pin CLK. Specifically, a resistor RA2 is connected in series between a clock signal input terminal DMIC _ CLK of the digital microphone DMIC and the clock pin CLK. The digital microphone DMIC outputs a DATA signal to the DATA pin DATA under the drive of the clock signal. The impedance matching condition is improved through the series resistor RA2, and radiation interference, overshoot and the like are reduced.

The analog signal output of the analog microphone AMIC is connected to the clock pin CLK. A resistor RA1 is connected in series between the analog signal output terminal of the analog microphone AMIC and the clock pin CLK. The analog microphone AMIC outputs an analog signal to the clock pin CLK driven by the clock signal. The impedance matching condition is improved through the series resistor RA1, and radiation interference, overshoot and the like are reduced.

Further, the analog signal output terminal of the analog microphone AMIC includes a left channel terminal MIC _ L and a right channel terminal MIC _ R. The left channel end MIC _ L and the right channel end MIC _ R output analog signals of an analog microphone AMIC. A left channel end MIC _ L and a right channel end MIC _ R are connected in parallel to the resistor RA 1.

Further, a capacitor CA2 is connected in series between the left channel end MIC _ L and the resistor RA1, and a capacitor CA1 is connected in series between the right channel end MIC _ R and the resistor RA 2. Preferably, the capacitance CA1 and the capacitance CA2 are both 2-2.5 muF. Further, in the present embodiment, the capacitance CA1 and the capacitance CA2 are 2.2 μ F. The filtering capacitor is arranged between the analog signal output end of the analog microphone AMIC and the resistor RA1, so that the anti-interference capability of the microphone can be effectively improved.

In this embodiment, the channel selection pin LR _ SEL and the ground pin are both grounded. Specifically, the ground pins include a GND1 pin, a GND2 pin, a GND3 pin and a GND4 pin, four ground pins are arranged in total, and each two ground pins are respectively matched with a digital signal and an analog signal, so that the compatibility of the digital signal and the analog signal on a chip is realized.

On the basis of the above technical solution, the present implementation further provides a circuit board, which includes the compatible circuit of the digital silicon microphone and the analog silicon microphone in the above technical solution.

On the basis of the technical scheme, the implementation also provides a silicon microphone which comprises the circuit board in the technical scheme.

The compatible circuit obtained through the design can be compatible with a digital signal output by a digital silicon microphone and an analog signal output by an analog silicon microphone on the MIC chip mainboard at the same time, and two different PCB boards do not need to be designed. And selecting a digital silicon microphone or a simulation silicon microphone according to the application scene when the SMT is used for producing the patch. Wherein, when the digital silicon microphone is loaded, the digital silicon microphone is still defined by the industry standard. When the upper piece of simulated silicon microphone is selected, the simulated silicon microphone adjusts the pad design on the original basis, the front sound output pad adjustment design of the simulated silicon microphone is shown in fig. 2, and the back sound output pad adjustment design of the simulated silicon microphone is shown in fig. 3.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A circuit compatible with a digital silicon microphone and an analog silicon microphone, comprising: the MIC chip comprises a power supply pin, a data pin, a clock pin, a channel selection pin and a grounding pin; wherein the power pin is connected to a power supply; a data output end of the digital microphone is connected to the data pin, and a clock signal input end of the digital microphone is connected to the clock pin; the analog signal output end of the analog microphone is connected to the clock pin; the channel selection pin and the ground pin are both grounded.

2. The digital and analog silicon microphone compatible circuit as defined by claim 1 wherein the ground pins include a GND1 pin, a GND2 pin, a GND3 pin and a GND4 pin.

3. The compatible circuit of digital silicon microphone and analog silicon microphone according to claim 1, wherein a resistor RA2 is connected in series between the clock signal input terminal of the digital microphone and the clock pin.

4. The compatible circuit of digital silicon microphone and analog silicon microphone according to claim 3, wherein a resistor RA1 is connected in series between the analog signal output terminal of the analog microphone and the clock pin.

5. The compatible circuit of digital silicon microphone and analog silicon microphone according to claim 4, wherein the analog signal output terminal of the analog microphone comprises a left channel terminal and a right channel terminal, and the left channel terminal and the right channel terminal are connected in parallel to the resistor RA 1.

6. The compatible circuit of digital silicon microphone and analog silicon microphone as claimed in claim 5, wherein a capacitor CA2 is connected in series between the left channel end and the resistor RA1, and a capacitor CA1 is connected in series between the right channel end and the resistor RA 2.

7. The compatible circuit of digital silicon microphone and analog silicon microphone as claimed in claim 6, wherein the capacitor CA1 and the capacitor CA2 are both 2-2.5 μ F.

8. A circuit board comprising the compatible circuit of any one of claims 1 to 7.

9. A silicon microphone comprising the circuit board of claim 8.