AD7623 Просмотр технического описания (PDF) - Analog Devices
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AD7623 Datasheet PDF : 28 Pages
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AD7623
Pin No.
35
36
37
38
39
43
45
46
47
48
Mnemonic
CNVST
AGND
REF
REFGND
IN−
IN+
TEMP
REFBUFIN
PDREF
PDBUF
Type 1
DI
P
AI/O
AI
AI
AI
AO
AI/O
DI
DI
Description
Conversion Start. A falling edge on CNVST puts the internal sample-and-hold into the hold state and
initiates a conversion.
Analog Power Ground Pin.
Reference Output/Input.
When PDREF/PDBUF = low, the internal reference and buffer are enabled, producing 2.048 V on this pin.
When PDREF/PDBUF = high, the internal reference and buffer are disabled, allowing an externally
supplied voltage reference up to AVDD volts. Decoupling is required with or without the internal
reference and buffer. Refer to the Voltage Reference Input section.
Reference Input Analog Ground.
Differential Negative Analog Input.
Differential Positive Analog Input.
Temperature Sensor Analog Output.
Internal Reference Output/Reference Buffer Input.
When PDREF/PDBUF = low, the internal reference and buffer are enabled, producing the 1.2 V (typical)
band gap output on this pin, which needs external decoupling. The internal fixed gain reference buffer
uses this to produce 2.048V on the REF pin.
When using an external reference with the internal reference buffer (PDBUF = low, PDREF = high),
applying 1.2 V on this pin produces 2.048 V on the REF pin. Refer to the Voltage Reference Input section.
Internal Reference Power-Down Input.
When low, the internal reference is enabled.
When high, the internal reference is powered down, and an external reference must be used.
Internal Reference Buffer Power-Down Input.
When low, the buffer is enabled (must be low when using internal reference).
When high, the buffer is powered-down.
1 AI = analog input; AI/O = bidirectional analog; AO = analog output; DI = digital input; DI/O = bidirectional digital; DO = digital output; P = power.
Rev. 0 | Page 10 of 28
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