JPS54133060A - Digital-analog conversion circuit using photo coupling element - Google Patents

Digital-analog conversion circuit using photo coupling element

Info

Publication number
JPS54133060A
JPS54133060A JP4098878A JP4098878A JPS54133060A JP S54133060 A JPS54133060 A JP S54133060A JP 4098878 A JP4098878 A JP 4098878A JP 4098878 A JP4098878 A JP 4098878A JP S54133060 A JPS54133060 A JP S54133060A
Authority
JP
Japan
Prior art keywords
light
decoder
conversion circuit
data
resistor
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
JP4098878A
Other languages
Japanese (ja)
Inventor
Masao Shibata
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP4098878A priority Critical patent/JPS54133060A/en
Publication of JPS54133060A publication Critical patent/JPS54133060A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To make easy the design of the conversion circuit and the selection of the components, by illuminating the light having the light amount corresponding to each terminal of the decoder interpreting binary digital electric signal and converting it into the analog electric signal corresponding to the light.
CONSTITUTION: The output of the decoder 2 interpreting the binary digital signal is weighted to the upper rank by one with the two input OR gate 3, connected to the anode of the light emitting diode 3 via the resistor 4, and the cathode is grounded and a given current flows to the diode 5 to cause light emission. Further, the light, that is, weighted light emission of the decoder 2 is obtained. To each collector terminal of the photo detection transistor in pair to it, the collector current corresponding to the number of light emitting diodes emitted by the number depending on the weight of the data 1, flows, and the analog data 8 corresponding to the weight of the data 1 is outputted across the resistor 7.
COPYRIGHT: (C)1979,JPO&Japio
JP4098878A 1978-04-06 1978-04-06 Digital-analog conversion circuit using photo coupling element Pending JPS54133060A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4098878A JPS54133060A (en) 1978-04-06 1978-04-06 Digital-analog conversion circuit using photo coupling element

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4098878A JPS54133060A (en) 1978-04-06 1978-04-06 Digital-analog conversion circuit using photo coupling element

Publications (1)

Publication Number Publication Date
JPS54133060A true JPS54133060A (en) 1979-10-16

Family

ID=12595797

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4098878A Pending JPS54133060A (en) 1978-04-06 1978-04-06 Digital-analog conversion circuit using photo coupling element

Country Status (1)

Country Link
JP (1) JPS54133060A (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3641564A (en) * 1966-06-23 1972-02-08 Stromberg Carlson Corp Digital-to-analog and analog-to-digital signal translation with optical devices

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3641564A (en) * 1966-06-23 1972-02-08 Stromberg Carlson Corp Digital-to-analog and analog-to-digital signal translation with optical devices

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