AD871SE 데이터 시트보기 (PDF) - Analog Devices

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AD871SE

Complete 12-Bit 5 MSPS Monolithic A/D Converter

Analog Devices 

AD871

PIN FUNCTION DESCRIPTIONS

Symbol

VINA

VINB

AVSS

AVDD

AGND

DGND

DVDD

BIT 12 (LSB)

BIT 2–BIT 11

MSB

OTR

CLK

REF OUT

REF GND

REF IN

BIT 1 (MSB)

DRVDD

DRGND

OEN

NC

DIP

LCC

Pin No. Pin No.

1

2

3, 25

4

5, 24

6, 23

7, 22

8

18–9

19

1

2

5, 40

6, 38

9, 36

10

33

16

26–17

29

20

30

21

31

26

41

27

42

28

43

N/A

27

N/A

12, 32

N/A

11, 34

Type

AI

AI

P

P

P

P

P

DO

DO

DO

DO

DI

AO

AI

AI

DO

P

P

N/A

13

DI

N/A

3, 4, 7, 8, 14, 15,

28, 35, 37, 39, 44

Name and Function

(+) Analog Input Signal on the differential input amplifier.

(–) Analog Input Signal on the differential input amplifier.

–5 V Analog Supply.

+5 V Analog Supply.

Analog Ground.

Digital Ground.

+5 V Digital Supply.

Least Significant Bit.

Data Bits 2 through 11.

Inverted Most Significant Bit. Provides twos complement output

data format.

Out of Range is Active HIGH on the leading edge of code 0 or

the trailing edge of code 4096. See Output Data Format Table III.

Clock Input. The AD871 will initiate a conversion on the rising

edge of the clock input. See the Timing Diagram for details.

+2.5 V Reference Output. Tie to REF IN for normal operation.

Reference Ground.

Reference Input. +2.5 V input gives ± 1 V full-scale range.

Most Significant Bit.

+5 V Digital Supply for the output drivers.

Digital Ground for the output drivers.

(See section on Power Supply Decoupling for details on

DRVDD and DRGND.)

Output Enable. See the Three State Output Timing Diagram for details.

No Connect.

TYPE: AI = Analog Input; AO = Analog Output; DI = Digital Input; DO = Digital Output; P = Power; N/A = Not Available on 28-lead DIP, available only on

44-terminal surface mount package.

PIN CONFIGURATIONS

28-Lead Side Brazed Ceramic DIP

44-Terminal LCC

VINA

VINB

AVSS

AVDD

AGND

DGND

DVDD

BIT 12 (LSB)

BIT 11

BIT 10

BIT 9

BIT 8

BIT 7

BIT 6

AD871

TOP VIEW

(Not to Scale)

REF IN

REF GND

REF OUT

AVSS

AGND

DGND

DVDD

CLK

OTR

MSB

BIT 2

BIT 3

BIT 4

BIT 5

6 5 4 3 2 1 44 43 42 41 40

NC 7

NC 8

AGND 9

DGND 10

DRGND 11

DRVDD 12

OEN 13

NC 14

NC 15

BIT 12 (LSB) 16

BIT 11 17

PIN 1

IDENTIFIER

AD871

TOP VIEW

(Not to Scale)

39 NC

38 AVDD

37 NC

36 AGND

35 NC

34 DRGND

33 DVDD

32 DRVDD

31 CLK

30 OTR

29 MSB

18 19 20 21 22 23 24 25 26 27 28

NC = NO CONNECT

REV. A

–5–

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