AD872A 데이터 시트보기 (PDF) - Analog Devices

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AD872A

Complete 12-Bit 10 MSPS Monolithic A/D Converter

Analog Devices 

Symbol

VINA

VINB

AVSS

AVDD

AGND

DGND

DVDD

BIT 12 (LSB)

BIT 2–BIT 11

MSB

OTR

CLK

REF OUT

REF GND

REF IN

DRVDD

NC

DRGND

OEN

BIT 1

AD872A

PIN DESCRIPTION

DIP LCC

Pin No. Pin No.

1

2

3, 25

1

2

5, 40

4

5, 24

6, 23

6, 38

9, 36

10

7, 22

8

18–9

33

16

26–17

19

29

Type

AI

AI

P

P

P

P

P

DO

DO

DO

20

30

DO

21

31

DI

26

41

AO

27

42

AI

28

43

AI

N/A

12, 32

P

N/A

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

28, 35, 37, 39, 44

N/A

11, 34

P

N/A

13

DI

N/A

27

DO

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 AD872A 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.

+5 V Digital Supply for the output drivers.

No Connect.

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.

Most Significant Bit.

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

44-terminal surface mount package.

28-Lead Ceramic DIP

PIN CONFIGURATIONS

44-Terminal LCC

VINA 1

VINB 2

28 REF IN

27 REF GND

AVSS 3

26 REF OUT

AVDD 4

25 AVSS

AGND 5 AD872A 24 AGND

DGND 6 TOP VIEW 23 DGND

DVDD 7 (Not to Scale) 22 DVDD

BIT 12 (LSB) 8

21 CLK

BIT 11 9

BIT 10 10

20 OTR

19 MSB

BIT 9 11

18 BIT 2

BIT 8 12

17 BIT 3

BIT 7 13

16 BIT 4

BIT 6 14

15 BIT 5

REV. A

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

AD872A

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

–5–

NC = NO CONNECT

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