JPS6022035U

JPS6022035U - A/D conversion device

Info

Publication number: JPS6022035U
Application number: JP9205183U
Authority: JP
Inventors: 大河内　隆夫
Original assignee: 日立建機株式会社
Priority date: 1983-06-17
Filing date: 1983-06-17
Publication date: 1985-02-15

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of drawings]

第１図は従来のＡ／Ｄ変換装置のブロック図、第２図は
本考案の実施例に係るＡ／Ｄ変換装置のブロック図、第
３図は第２図に示すＡ／Ｄ変換装置の動作を説明するフ
ローチャート、第４図は第２図に示すＡ／Ｄ変換器の作
動範囲を示すグラフである。２・・・サンプルホールド回路、４・・・トライステー
トバッファ、６−Ａ／Ｄ変換器、７ａ、７ｂ、７Ｃ・・
・アナログシフト回路、８ａ、８ｂ、８ｃ・・・信号発
生装置、９・・・マルチプレクサ、１０・・・制御装置
。FIG. 1 is a block diagram of a conventional A/D converter, FIG. 2 is a block diagram of an A/D converter according to an embodiment of the present invention, and FIG. 3 is a block diagram of the A/D converter shown in FIG. A flowchart explaining the operation, and FIG. 4 is a graph showing the operating range of the A/D converter shown in FIG. 2. 2... Sample hold circuit, 4... Tri-state buffer, 6-A/D converter, 7a, 7b, 7C...
- Analog shift circuit, 8a, 8b, 8c...signal generator, 9...multiplexer, 10...control device.

Claims

[Claims for Utility Model Registration] 1. An A/D that includes a sample-and-hold circuit that holds manually input analog quantities and an A/D converter that converts the analog quantities held in this sample-and-hold circuit into digital quantities. In the conversion device, an analog shift means for shifting the analog quantity held by the sample hold circuit by a certain predetermined amount, a judgment means for determining the optimum shift amount in the analog shift means, and the sample hole 1
~ input means for inputting the remaining analog quantity, obtained by shifting the optimum shift quantity determined by the determination means from the analog quantity held in the circuit, into the A/D converter; and the A/D converter;
An A/D converter comprising: an adding means for adding a digital amount corresponding to the optimum shift amount to a digital amount obtained by the D converter. 2 Utility Model Registration The A/D converter according to claim 1, wherein the predetermined amount to be shifted is an amount equal to an analog input range of the A/D converter. 3. Utility model registration Claim 1, characterized in that the analog shift means is a plurality of analog shift circuits that sequentially shift an integral multiple of a shift amount equal to the analog input range of the A/D converter. An A/D conversion device that performs utility model registration Claim 1, wherein the determining means determines whether the predetermined amount is positive or negative when the predetermined amount is shifted from the analog amount held in the sample and hold circuit. An A/D converter characterized by: 5. Utility model registration Claim 1, characterized in that the input means is a multiplexer that inputs the analog amount remaining after shifting the optimum shift amount determined by the determination means to the A/D converter. A/D conversion device.