AD674 데이터 시트보기 (PDF) - Analog Devices

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AD674

Complete 12-Bit A/D Converters

Analog Devices 

AD674B/AD774B

PIN CONFIGURATION

VLOGIC 1

12/8 2

28 STS

27 DB11 (MSB)

CS 3

26 DB10

A0 4

R/C 5

CE 6

AD674B

OR

AD774B

25 DB9

24 DB8

23 DB7

VCC 7 TOP VIEW 22 DB6

REF OUT 8 (Not to Scale) 21 DB5

AGND 9

20 DB4

REF IN 10

19 DB3

VEE 11

BIP OFF 12

18 DB2

17 DB1

10 VIN 13

20 VIN 14

16 DB0 (LSB)

15 DGND

PIN FUNCTION DESCRIPTIONS

Symbol Pin No. Type* Name and Function

AGND

9

A0

4

BIP OFF 12

CE

6

CS

3

DB11–DB8 27–24

DB7–DB4 23–20

DB3–DB0 19–16

DGND 15

REF OUT 8

R/C

5

REF IN 10

STS

28

VCC

7

VEE

11

VLOGIC

1

10 VIN

13

20 VIN

14

12/8

2

P

Analog Ground (Common)

DI Byte Address/Short Cycle. If a conversion is started with A0 Active LOW, a full 12-bit conversion

cycle is initiated. If A0 is Active HIGH during a convert start, a shorter 8-bit conversion cycle

results. During Read (R/C = 1) with 12/8 LOW, A0 = LOW enables the 8 most significant bits,

and A0 = HIGH enables DB3–DB0 and sets DB7–DB4 = 0.

AI Bipolar Offset. Connect through a 50 Ω resistor to REF OUT for bipolar operation or to Analog

Common for unipolar operation.

DI Chip Enable. Chip Enable is Active HIGH and is used to initiate a convert or read operation.

DI Chip Select. Chip Select is Active LOW.

DO Data Bits 11 through 8. In the 12-bit format (see 12/8 and A0 pins) these pins provide the upper

4 bits of data. In the 8-bit format, they provide the upper 4 bits when A0 is LOW and are

disabled when A0 is HIGH.

DO Data Bits 7 through 4. In the 12-bit format these pins provide the middle 4 bits of data. In the

8-bit format they provide the middle 4 bits when A0 is LOW and all zeroes when A0 is HIGH.

DO Data Bits 3 through 0. In both the 12-bit and 8-bit format these pins provide the lower 4 bits of

data when A0 is HIGH; they are disabled when A0 is LOW.

P

Digital Ground (Common)

AO 10 V Reference Output

DI Read/Convert. In the full control mode R/C is Active HIGH for a read operation and Active LOW

for a convert operation. In the standalone mode, the falling edge of R/C initiates a conversion.

AI Reference Input is connected through a 50 Ω resistor to +10 V Reference for normal operation.

DO Status is Active HIGH when a conversion is in progress and goes LOW when the conversion is

completed.

P

+12 V/+15 V Analog Supply

P

–12 V/–15 V Analog Supply

P

5 V Logic Supply

AI 10 V Span Input, 0 V to +10 V unipolar mode or –5 V to +5 V bipolar mode. When using the

20 V Span, 10 VIN should not be connected.

AI 20 V Span Input, 0 V to +20 V unipolar mode or –10 V to +10 V bipolar mode. When using the

10 V Span, 20 VIN should not be connected.

DI The 12/8 pin determines whether the digital output data is to be organized as two 8-bit words

(12/8 LOW) or a single 12-bit word (12/8 HIGH).

*Types: AI = Analog Input, AO = Analog Output, DI = Digital Input, DO = Digital Output, P = Power

–6–

REV. C

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