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AD7674 Datasheet(PDF) 10 Page - Analog Devices

Part # AD7674
Description  16-Bit, 250 kSPS, Unipolar/Bipolar Programmable Input PulSAR ADC
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD7674 Datasheet(HTML) 10 Page - Analog Devices

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AD7610
Rev. 0 | Page 10 of 32
Pin No.
Mnemonic
Type1
Description
27
D14 or
DI/O
In parallel mode, this output is used as Bit 14 of the parallel port data output bus.
SCCLK
Serial Configuration Clock. In serial software configuration mode (SER/PAR = high, HW/SW = low) this input is
used to clock in the data on SCIN. The active edge where the data SCIN is updated depends on the logic state
of the INVSCLK pin. See the
Software Configuration section.
28
D15 or
DI/O
In parallel mode, this output is used as Bit 15 of the parallel port data output bus.
SCCS
Serial Configuration Chip Select. In serial software configuration mode (SER/PAR = high, HW/SW = low) this
input enables the serial configuration port. See the
Software Configuration section.
29
BUSY
DO
Busy Output. Transitions high when a conversion is started, and remains high until the conversion
is complete and the data is latched into the on-chip shift register. The falling edge of BUSY can be
used as a data ready clock signal. Note that in master read after convert mode (SER/PAR = high, EXT/INT = low,
RDC = low) the busy time changes according to
Table 4.
30
TEN
DI2
Input Range Select. Used in conjunction with BIPOLAR per the following:
Input Range
BIPOLAR
TEN
0 V to 5 V
Low
Low
0 V to 10 V
Low
High
±5 V
High
Low
±10 V
High
High
31
RD
DI
Read Data. When CS and RD are both low, the interface parallel or serial output bus is enabled.
32
CS
DI
Chip Select. When CS and RD are both low, the interface parallel or serial output bus is enabled. CS is also
used to gate the external clock in slave serial mode (not used for serial programmable port).
33
RESET
DI
Reset Input. When high, reset the AD7610. Current conversion, if any, is aborted. The falling edge of RESET
resets the data outputs to all zero’s (with OB/2C = high) and clears the configuration register. See the
Digital
Interface section. If not used, this pin can be tied to OGND.
34
PD
DI2
Power-Down Input. When PD = high, power down the ADC. Power consumption is reduced and conversions
are inhibited after the current one is completed. The digital interface remains active during power down.
35
CNVST
DI
Conversion Start. A falling edge on CNVST puts the internal sample-and-hold into the hold state and initiates
a conversion.
36
BIPOLAR
DI2
Input Range Select. See description for Pin 30.
37
REF
AI/O
Reference Input/Output. When PDREF/PDBUF = low, the internal reference and buffer are enabled, producing 5 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 with at least a 22 μF is required with or without the
internal reference and buffer. See the
Reference Decoupling section.
38
REFGND
AI
Reference Input Analog Ground. Connected to analog ground plane.
39
IN−
AI
Analog Input Ground Sense. Should be connected to the analog ground plane or to a remote sense ground.
40
VCC
P
High Voltage Positive Supply. Normally +7 V to +15 V.
41
VEE
P
High Voltage Negative Supply. Normally 0 V to −15 V (0 V in unipolar ranges).
43
IN+
AI
Analog Input. Referenced to IN−.
45
TEMP
AO
Temperature Sensor Analog Output. Enabled when the internal reference is turned on (PDREF = PDBUF =
low). See the
Temperature Sensor section.
46
REFBUFIN
AI
Reference Buffer Input. When using an external reference with the internal reference buffer (PDBUF = low,
PDREF = high), applying 2.5 V on this pin produces 5 V on the REF pin. See the
Voltage Reference Input section.
47
PDREF
DI
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.
48
PDBUF
DI
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.
2 In serial configuration mode (SER/PAR = high, HW/SW = low), this input is programmed with the serial configuration register and this pin is a don’t care. See the
Hardware Configuration section and Software Configuration section.


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