JPS6444130A - A/d converter - Google Patents

A/d converter

Info

Publication number
JPS6444130A
JPS6444130A JP19985587A JP19985587A JPS6444130A JP S6444130 A JPS6444130 A JP S6444130A JP 19985587 A JP19985587 A JP 19985587A JP 19985587 A JP19985587 A JP 19985587A JP S6444130 A JPS6444130 A JP S6444130A
Authority
JP
Japan
Prior art keywords
voltage
integration
current
circuit
comparison level
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
Application number
JP19985587A
Other languages
Japanese (ja)
Inventor
Yoshimi Iso
Masami Tsuchida
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.)
Hitachi Ltd
Pioneer Corp
Original Assignee
Hitachi Ltd
Pioneer Electronic Corp
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 Hitachi Ltd, Pioneer Electronic Corp filed Critical Hitachi Ltd
Priority to JP19985587A priority Critical patent/JPS6444130A/en
Publication of JPS6444130A publication Critical patent/JPS6444130A/en
Pending legal-status Critical Current

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Landscapes

  • Analogue/Digital Conversion (AREA)

Abstract

PURPOSE:To eliminate the deterioration in the conversion linearity against the dispersion in the reference voltage, and temperature/power supply voltage fluctuation by giving a correlation to a midpoint potential of an integration type A/D converter of a single power supply, a comparison level potential and an integration current. CONSTITUTION:When a voltage corresponding to an analog signal inputted to a terminal 1 is held in an integration capacitor 66, switches 11, 12 are closed and a constant current is supplied from a constant current circuit 30 to the capacitor 6 and integration is started. Then the voltage of the capacitor 6 is compared with a comparison level from a comparison level generating circuit 10 by comparators 18, 19 an the period till the output of the comparators 18, 19 is inverted is counted by counters 21, 22 to obtain a digital value. In this case, since constant voltage source circuits 8, 9 decides a voltage to be supplied to the circuit 10, a midpoint potential with reference to the output potential of reference power supplies 28 and a voltage supplied to a voltage-current conversion circuit 29 controlling the reference current of the circuit 30, the correlativity is given to the midpoint potential, the comparison level and the integration current.
JP19985587A 1987-08-12 1987-08-12 A/d converter Pending JPS6444130A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP19985587A JPS6444130A (en) 1987-08-12 1987-08-12 A/d converter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP19985587A JPS6444130A (en) 1987-08-12 1987-08-12 A/d converter

Publications (1)

Publication Number Publication Date
JPS6444130A true JPS6444130A (en) 1989-02-16

Family

ID=16414771

Family Applications (1)

Application Number Title Priority Date Filing Date
JP19985587A Pending JPS6444130A (en) 1987-08-12 1987-08-12 A/d converter

Country Status (1)

Country Link
JP (1) JPS6444130A (en)

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