AD5547 View Datasheet(PDF) - Analog Devices

Part Name

Description

Manufacturer

AD5547

Dual-Current Output, Parallel Input, 16-/14-Bit Multiplying DACs with 4-Quadrant Resistors

Analog Devices 

AD5547/AD5557

Data Sheet

NC 1

NC 2

ROFSA 3

RFBA 4

R1A 5

RCOMA 6

VREFA 7

IOUTA 8

AGNDA 9

DGND 10

AGNDB 11

IOUTB 12

VREFB 13

RCOMB 14

R1B 15

RFBB 16

ROFSB 17

WR 18

A0 19

AD5557

TOP VIEW

(Not to Scale)

38 D0

37 D1

36 D2

35 D3

34 D4

33 D5

32 D6

31 D7

30 D8

29 VDD

28 D9

27 D10

26 D11

25 D12

24 D13

23 RS

22 MSB

21 LDAC

20 A1

NC = NO CONNECT

Figure 5. AD5557 Pin Configuration

Table 4. AD5557 Pin Function Descriptions

Pin No.

Mnemonic Function

1, 2

NC

No Connection. Do not connect anything other than the dummy pads to these pins.

3

ROFSA

Bipolar Offset Resistor A. Accepts up to ±18 V. In 2-quadrant mode, ROFSA ties to RFBA. In 4-quadrant mode, ROFSA

ties to R1A and the external reference.

4

RFBA

Internal Matching Feedback Resistor A. Connects to the external op amp for I-to-V conversion.

5

R1A

4-Quandrant Resistor. In 2-quadrant mode, R1A shorts to the VREFA pin. In 4-quadrant mode, R1A ties to ROFSA. Do

not connect when operating in unipolar mode.

6

RCOMA

Center Tap Point of the Two 4-Quadrant Resistors, R1A and R2A. In 4-quadrant mode, RCOMA ties to the inverting

node of the reference amplifier. In 2-quadrant mode, RCOMA shorts to the VREFA pin. Do not connect if operating

in unipolar mode.

7

VREFA

DAC A Reference Input in 2-Quadrant Mode, R2 Terminal in 4-Quadrant Mode. In 2-quadrant mode, VREFA is the

reference input with constant input resistance vs. code. In 4-quadrant mode, VREFA is driven by the external

reference amplifier.

8

IOUTA

DAC A Current Output. Connects to the inverting terminal of external precision I-to-V op amp for voltage

output.

9

AGNDA

DAC A Analog Ground.

10

DGND

Digital Ground.

11

AGNDB

DAC B Analog Ground.

12

IOUTB

DAC B Current Output. Connects to inverting terminal of external precision I-to-V op amp for voltage output.

13

VREFB

DAC B Reference Input Pin. Establishes DAC full-scale voltage. Constant input resistance vs. code. If configured

with an external op amp for 4-quadrant multiplying, VREFB becomes –VREF.

14

RCOMB

Center Tap Point of the Two 4-Quadrant Resistors, R1B and R2B. In 4-quadrant mode, RCOMB ties to the inverting

node of the reference amplifier. In 2-quadrant mode, RCOMB shorts to the VREFB pin. Do not connect if operating

in unipolar mode.

15

R1B

4-Quandrant Resistor. In 2-quadrant mode, R1B shorts to the VREFB pin. In 4-quadrant mode, R1B ties to ROFSB. Do

not connect if operating in unipolar mode.

16

RFBB

Internal Matching Feedback Resistor B. Connects to external op amp for I-to-V conversion.

17

ROFSB

Bipolar Offset Resistor B. Accepts up to ±18 V. In 2-quadrant mode, ROFSB ties to RFBB. In 4-quadrant mode, ROFSB

ties to R1B and an external reference.

18

WR

Write Control Digital Input In, Active Low. Transfers shift register data to the DAC register on the rising edge.

Signal level must be ≤VDD + 0.3 V.

19

A0

Address Pin 0. Signal level must be ≤VDD + 0.3 V.

20

A1

Address Pin 1. Signal level must be ≤VDD + 0.3 V.

21

LDAC

Digital Input Load DAC Control. Signal level must be ≤VDD + 0.3 V.

22

MSB

Power-On Reset State. MSB = 0 corresponds to zero-scale reset; MSB = 1 corresponds to midscale reset. The

signal level must be ≤VDD + 0.3 V.

Rev. D | Page 8 of 20

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