AD7892 데이터 시트보기 (PDF) - Analog Devices

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AD7892

LC2MOS Single Supply, 12-Bit 600 kSPS ADC

Analog Devices 

Pin

No. Mnemonic

16

DB4/SCLK

17

DB3/RFS

18

DB2

19

DB1

20

DB0

21

RD

22

CS

23

EOC

24

CONVST

AD7892

Description

Data Bit 4/Serial Clock. When the device is in its parallel mode, this pin is Data Bit 4, a three-state

TTL-compatible output. When the device is in its serial mode, this becomes the serial clock pin,

SCLK. SCLK is an input and an external serial clock must be provided at this pin to obtain serial

data from the AD7892. Serial data is clocked out from the output shift register on the rising edges

of SCLK after RFS goes low.

Data Bit 3/Receive Frame Synchronization. When the device is in its parallel mode, this pin is Data

Bit 3, a three-state TTL-compatible output. When the device is in its serial mode, this becomes the

receive frame synchronization input with RFS provided externally to obtain serial data from the

AD7892.

Data Bit 2. Three-state TTL-compatible output. This output should be left unconnected when the

device is in its serial mode.

Data Bit 1. Three-state TTL-compatible output. This output should be left unconnected when the

device is in its serial mode.

Data Bit 0 (LSB). Three-state TTL-compatible output. Output coding is two’s complement for

AD7892-1 and AD7892-3 and straight (natural) binary for AD7892-2. This output should be left

unconnected when the device is in its serial mode.

Read. Active low logic input which is used in conjunction with CS low to enable the data outputs.

Chip Select. Active low logic input which is used in conjunction with RD to enable the data outputs.

End-of-Conversion. Active low logic output indicating converter status. The end of conversion is

signified by a low going pulse on this line. The duration of this EOC pulse is nominally 100 ns.

Convert Start. Logic Input. A low-to-high transition on this input puts the track/hold into its hold

mode and starts conversion.

PIN CONFIGURATION

DIP and SOIC

VDD 1

STANDBY 2

24 CONVST

23 EOC

VIN2 3

22 CS

VIN1 4

21 RD

REF OUT/REF IN 5

20 DB0 (LSB)

AGND 6 AD7892 19 DB1

TOP VIEW

MODE 7 (Not to Scale) 18 DB2

DB11/LOW 8

17 DB3/RFS

DB10/LOW 9

16 DB4/SCLK

DB9 10

15 DB5/SDATA

DB8 11

14 DGND

DB7 12

13 DB6

REV. C

–7–

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