JPS6159913A - Ad converting circuit - Google Patents
Ad converting circuitInfo
- Publication number
- JPS6159913A JPS6159913A JP18112184A JP18112184A JPS6159913A JP S6159913 A JPS6159913 A JP S6159913A JP 18112184 A JP18112184 A JP 18112184A JP 18112184 A JP18112184 A JP 18112184A JP S6159913 A JPS6159913 A JP S6159913A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- over range
- converter
- output
- detection
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Analogue/Digital Conversion (AREA)
Abstract
Description
【発明の詳細な説明】 産業上の利用分野 本発明はＡＤ変換回路に関する。[Detailed description of the invention] Industrial applications The present invention relates to an AD conversion circuit.
従来の技術
従来、ＡＤ変換器の大部分はオーバーレンジ検出機能が
なくオーバーレンジ機能ヲ有スるＡＤ変換器は特殊で高
価であった。2. Description of the Related Art In the past, most AD converters did not have an overrange detection function, and AD converters with an overrange function were special and expensive.
発明が解決しようとする問題点
オーバーレンジ検出機能を有するＡＤ変換器は品種が少
なく高価であるという問題を有している。Problems to be Solved by the Invention There are problems in that AD converters having an overrange detection function are available in few varieties and are expensive.
問題を解決するための手段
本発明はオーバーレンジ検出機能のないＡＤ変換器のデ
ジタル出力信号に論理演算をほどこしてオーバーレンジ
信号を得ることを特徴とするものである。Means for Solving the Problem The present invention is characterized in that an overrange signal is obtained by performing a logical operation on a digital output signal of an AD converter without an overrange detection function.
作用
本発明（−よればオーバーレンジ検出機能のないＡＤ変
換器を用いてオーバーレンジ検出機能を、有する人り変
換回路を構成する事ができる。According to the present invention (-), it is possible to construct a human conversion circuit having an overrange detection function using an AD converter without an overrange detection function.
実施例
本発明の一実施例を説明する。第１図中１はＡＤ変換す
るアナログ信号の入力端子、２は上位基準電圧入力端子
、３は下位基準電圧入力端子で、この２つの間の電圧の
アナログ信号デジタル変換する。４は変換クロック入力
端子で、このクロックの立上がυ又は立下が９でアナロ
グ入力端子１に入力したアナログ信号をデジタル出力端
子７より出力する。ＡＤ変換器５はアナログ信号入力端
子１に入力するアナログ信号が上位基準電圧と同じ電圧
になった時は所定のデジタル信号を出力するが、（この
例ではすべてハイレベルの信号とする。）上位基準圧よ
り高い電圧のアナログ入力信号が入力しても、上位基準
電圧と同じ電圧のアナログ入力があフた時と同じデジタ
ル信号を出力してしまう。そこでＡＤ変換器５からのデ
ジタル出力がすべてハイレベルになるのをオーバーフロ
ー検出回路７で検出し、オーバーフロー出力とする。又
、ＡＤ変換器５は下位基準電圧と同じ電圧のアナログ信
号がアナログ入力端子１（二人力すると所定のデジタル
信号（この例ではすべてローレベルとする。）を出力す
るが、下位基準電圧より低い電圧のアナログ信号が入力
しても同じデジタル信号を出力してしまうので、ＡＤ変
換器５のデジタル信号がすべてローレベルになるのをア
ンダーフロー検出回路８で検出してアンダーフロー出力
とする。オーバーフロー検出回路７の出力とアンダー７
０−検出回路８の出力の論理和をとってオーバーレンジ
出力端子からのオーバーレンジ出力とする。EXAMPLE An example of the present invention will be described. In FIG. 1, 1 is an input terminal of an analog signal to be AD converted, 2 is an upper reference voltage input terminal, and 3 is a lower reference voltage input terminal, and the analog signal of the voltage between these two is converted into digital. Reference numeral 4 denotes a conversion clock input terminal, and when this clock rises at υ or falls at 9, the analog signal input to the analog input terminal 1 is outputted from the digital output terminal 7. The AD converter 5 outputs a predetermined digital signal when the analog signal input to the analog signal input terminal 1 becomes the same voltage as the upper reference voltage (in this example, all signals are high level). Even if an analog input signal with a voltage higher than the reference voltage is input, the same digital signal as when the analog input with the same voltage as the upper reference voltage goes out is output. Therefore, the overflow detection circuit 7 detects that all digital outputs from the AD converter 5 become high level, and outputs an overflow. In addition, the AD converter 5 outputs a predetermined digital signal (in this example, all low level) when an analog signal with the same voltage as the lower reference voltage is input to the analog input terminal 1 (when two people input it), but it is lower than the lower reference voltage. Even if a voltage analog signal is input, the same digital signal is output, so the underflow detection circuit 8 detects when all the digital signals of the AD converter 5 become low level and outputs an underflow.Overflow Output of detection circuit 7 and under 7
The logical sum of the outputs of the 0-detection circuit 8 is taken to provide an overrange output from the overrange output terminal.
発明の効果
上述したよつに、本発明によれば、オーバーレンジ検出
機能のないＡＤ変換器を用いてオーバーレンジ検出機能
を有するＡＤ変換回路を比較的安価に構成することがで
きる。Effects of the Invention As described above, according to the present invention, an AD conversion circuit having an overrange detection function can be constructed at relatively low cost using an AD converter without an overrange detection function.
第１図は本発明の一実施例を示す回路図である０
１はアナログ入力端子、２は上位基準電圧入力端子、３
は下位基準電圧入力端子、４は変換クロック入力端子、
５はＡＤ変換器、６はデジタル出力端子、７はオーバー
フロー検出回路、８はアンダーフロー検出回路、９はオ
ーツ（−レンジ出力端子FIG. 1 is a circuit diagram showing an embodiment of the present invention. 0 1 is an analog input terminal, 2 is an upper reference voltage input terminal, 3 is a circuit diagram showing an embodiment of the present invention.
is the lower reference voltage input terminal, 4 is the conversion clock input terminal,
5 is an AD converter, 6 is a digital output terminal, 7 is an overflow detection circuit, 8 is an underflow detection circuit, 9 is an automatic (-range output terminal)
Claims (1)
オーバーレンジ信号を得ることを特徴とするＡＤ変換回
路。An AD conversion circuit characterized in that an overrange signal is obtained by performing a logical operation on a digital output signal of an AD converter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18112184A JPS6159913A (en) | 1984-08-30 | 1984-08-30 | Ad converting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18112184A JPS6159913A (en) | 1984-08-30 | 1984-08-30 | Ad converting circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6159913A true JPS6159913A (en) | 1986-03-27 |
Family
ID=16095218
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18112184A Pending JPS6159913A (en) | 1984-08-30 | 1984-08-30 | Ad converting circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6159913A (en) |
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55128468A (en) * | 1979-03-27 | 1980-10-04 | Canon Inc | Recording head |
| JPS641553A (en) * | 1987-03-27 | 1989-01-05 | Canon Inc | Base body for ink jet recording head, ink jet recording head and ink jet recording apparatus equipped with said recording head |
| JPS6486619A (en) * | 1987-09-28 | 1989-03-31 | Nec Corp | Digital signal processing circuit |
| JPH02254819A (en) * | 1989-03-28 | 1990-10-15 | Nec Ic Microcomput Syst Ltd | Analog/digital conversion circuit |
| JPH03198429A (en) * | 1989-12-26 | 1991-08-29 | Mitsubishi Electric Corp | Input level deciding circuit for a/d converter |
| US5301404A (en) * | 1992-03-26 | 1994-04-12 | Tokyo Electric Co., Ltd. | Method of producing printer head using piezoelectric member |
| US5818482A (en) * | 1994-08-22 | 1998-10-06 | Ricoh Company, Ltd. | Ink jet printing head |
| US6106106A (en) * | 1997-01-14 | 2000-08-22 | Nec Corporation | Ink jet recording head having a piezoelectric substrate |
| US6161926A (en) * | 1995-10-09 | 2000-12-19 | Nec Corporation | Ink jet recording device made of a dielectric polarized material |
| WO2001030577A1 (en) | 1999-10-29 | 2001-05-03 | Aprion Digital Ltd. | Inkjet print head |
| US6361151B1 (en) | 1998-03-20 | 2002-03-26 | Nec Corporation | Ink jet recording head and manufacturing method thereof |
| US6578956B1 (en) | 1999-04-30 | 2003-06-17 | Canon Kabushiki Kaisha | Ink jet recording head and ink jet recording apparatus |
| US6601952B2 (en) | 2000-04-28 | 2003-08-05 | Canon Kabushiki Kaisha | Recording apparatus |
| US6834940B2 (en) | 2002-04-04 | 2004-12-28 | Canon Kabushiki Kaisha | Liquid discharge head and recording apparatus provided with the liquid discharge head |
-
1984
- 1984-08-30 JP JP18112184A patent/JPS6159913A/en active Pending
Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55128468A (en) * | 1979-03-27 | 1980-10-04 | Canon Inc | Recording head |
| JPH0322305B2 (en) * | 1979-03-27 | 1991-03-26 | Canon Kk | |
| JPS641553A (en) * | 1987-03-27 | 1989-01-05 | Canon Inc | Base body for ink jet recording head, ink jet recording head and ink jet recording apparatus equipped with said recording head |
| JPS6486619A (en) * | 1987-09-28 | 1989-03-31 | Nec Corp | Digital signal processing circuit |
| JPH02254819A (en) * | 1989-03-28 | 1990-10-15 | Nec Ic Microcomput Syst Ltd | Analog/digital conversion circuit |
| JPH03198429A (en) * | 1989-12-26 | 1991-08-29 | Mitsubishi Electric Corp | Input level deciding circuit for a/d converter |
| US5301404A (en) * | 1992-03-26 | 1994-04-12 | Tokyo Electric Co., Ltd. | Method of producing printer head using piezoelectric member |
| US5818482A (en) * | 1994-08-22 | 1998-10-06 | Ricoh Company, Ltd. | Ink jet printing head |
| US6390609B1 (en) | 1995-10-09 | 2002-05-21 | Nec Corporation | Ink jet recording device and method of producing the same |
| US6161926A (en) * | 1995-10-09 | 2000-12-19 | Nec Corporation | Ink jet recording device made of a dielectric polarized material |
| US6106106A (en) * | 1997-01-14 | 2000-08-22 | Nec Corporation | Ink jet recording head having a piezoelectric substrate |
| US6361151B1 (en) | 1998-03-20 | 2002-03-26 | Nec Corporation | Ink jet recording head and manufacturing method thereof |
| US6658737B2 (en) | 1998-03-20 | 2003-12-09 | Fuji Xerox Co., Ltd. | Ink jet recording head and manufacturing method thereof |
| US6578956B1 (en) | 1999-04-30 | 2003-06-17 | Canon Kabushiki Kaisha | Ink jet recording head and ink jet recording apparatus |
| WO2001030577A1 (en) | 1999-10-29 | 2001-05-03 | Aprion Digital Ltd. | Inkjet print head |
| US6601952B2 (en) | 2000-04-28 | 2003-08-05 | Canon Kabushiki Kaisha | Recording apparatus |
| US6834940B2 (en) | 2002-04-04 | 2004-12-28 | Canon Kabushiki Kaisha | Liquid discharge head and recording apparatus provided with the liquid discharge head |
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