JPS57207426A - Analog-to-digital converter - Google Patents

Analog-to-digital converter

Info

Publication number
JPS57207426A
JPS57207426A JP9284081A JP9284081A JPS57207426A JP S57207426 A JPS57207426 A JP S57207426A JP 9284081 A JP9284081 A JP 9284081A JP 9284081 A JP9284081 A JP 9284081A JP S57207426 A JPS57207426 A JP S57207426A
Authority
JP
Japan
Prior art keywords
vref
constitution
given
converter
decoder
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.)
Granted
Application number
JP9284081A
Other languages
Japanese (ja)
Other versions
JPS6348455B2 (en
Inventor
Kazunori Mizogami
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Olympus Corp
Original Assignee
Olympus Corp
Olympus Optical Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Olympus Corp, Olympus Optical Co Ltd filed Critical Olympus Corp
Priority to JP9284081A priority Critical patent/JPS57207426A/en
Publication of JPS57207426A publication Critical patent/JPS57207426A/en
Publication of JPS6348455B2 publication Critical patent/JPS6348455B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M1/00—Analogue/digital conversion; Digital/analogue conversion
    • H03M1/12—Analogue/digital converters
    • H03M1/20—Increasing resolution using an n bit system to obtain n + m bits
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M1/00—Analogue/digital conversion; Digital/analogue conversion
    • H03M1/12—Analogue/digital converters
    • H03M1/48—Servo-type converters

Abstract

PURPOSE:To obtain a resolution in N+1-bit with N-bit constitution, by the constitution that a symmetrical step waveform can be obtained for high and low potential sides at the same time and a follow-up comparison type D/A converter is adopted. CONSTITUTION:In a D/A converter 13, output voltages Vd1 and Vd2 form symmetrical step waveform for high and low potential sides by taking a reference voltage VREF as a reference. The voltages Vd1 and Vd2 are controlled to follow an input analog voltage Vi and an up-down counter 11 is switchingly controlled so that Vi=Vd1 is obtained at Vi>VREF and Vi=Vd2 at Vi<VREF. Maximum 16 signals of digital signals are given from the counter 11 to a decoder 30 corresponding to Vi>VREF or Vi<VREF. The digital signals given to the decoder 30 is converted into a decimal number and given to a display circuit 31. To one of liquid crystal displays 3401-3416 and 3417-3432, display is made through the comparison and discrimination between the Vi and the VREF at a comparator 29.
JP9284081A 1981-06-15 1981-06-15 Analog-to-digital converter Granted JPS57207426A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9284081A JPS57207426A (en) 1981-06-15 1981-06-15 Analog-to-digital converter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9284081A JPS57207426A (en) 1981-06-15 1981-06-15 Analog-to-digital converter

Publications (2)

Publication Number Publication Date
JPS57207426A true JPS57207426A (en) 1982-12-20
JPS6348455B2 JPS6348455B2 (en) 1988-09-29

Family

ID=14065623

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9284081A Granted JPS57207426A (en) 1981-06-15 1981-06-15 Analog-to-digital converter

Country Status (1)

Country Link
JP (1) JPS57207426A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62187654A (en) * 1986-02-14 1987-08-17 Japan Electronic Control Syst Co Ltd Data retrieval unit for automobile control device

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01127442U (en) * 1988-02-25 1989-08-31
JP6463221B2 (en) * 2015-05-26 2019-01-30 日立オートモティブシステムズ株式会社 ADC self-test circuit

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5596727A (en) * 1979-01-17 1980-07-23 Hitachi Ltd Successive comparison-type a/d converter
JPS55161423A (en) * 1979-06-04 1980-12-16 Chino Works Ltd Signal converter

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5596727A (en) * 1979-01-17 1980-07-23 Hitachi Ltd Successive comparison-type a/d converter
JPS55161423A (en) * 1979-06-04 1980-12-16 Chino Works Ltd Signal converter

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62187654A (en) * 1986-02-14 1987-08-17 Japan Electronic Control Syst Co Ltd Data retrieval unit for automobile control device

Also Published As

Publication number Publication date
JPS6348455B2 (en) 1988-09-29

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