AD5546 datasheet(6/20 Pages) AD

Part #	AD5546

Description	Current Output, Parallel Input, 16-/14-Bit Multiplying DACs with Four-Quadrant Resistors

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AD5546/AD5556

Data Sheet

Rev. D | Page 6 of 20

PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS

AD5546

TOP VIEW

(Not to Scale)

D7

1

VDD

28

D6

2

D8

27

D5

3

D9

26

D4

4

D10

25

D3

5

D11

24

D2

6

D12

23

D1

7

D13

22

D0

8

D14

21

ROFS 9

D15

20

RFB 10

GND

19

R1 11

RS

18

RCOM 12

MSB

17

REF 13

WR

16

IOUT 14

LDAC

15

Figure 4. AD5546 Pin Configuration

AD5556

TOP VIEW

(Not to Scale)

NC = NO CONNECT

D5

1

VDD

28

D4

2

D6

27

D3

3

D7

26

D2

4

D8

25

D1

5

D9

24

D0

6

D10

23

NC

7

D11

22

NC

8

D12

21

ROFS 9

D13

20

RFB 10

GND

19

R1 11

RS

18

RCOM 12

MSB

17

REF 13

WR

16

IOUT 14

LDAC

15

Figure 5. AD5556 Pin Configuration

Table 3. AD5546 Pin Function Descriptions

Pin No.

Mnemonic

Description

1 to 8

D7 to D0

Digital Input Data Bits[D7: D0]. The signal level must be ≤ VDD + 0.3 V.

9

ROFS

Bipolar Offset Resistor. Accepts up to ±18 V. In two-quadrant mode, ties to RFB. In four-quadrant mode, ties to R1

and the external reference.

10

RFB

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

11

R1

Four-Quadrant Resistor R1. In two-quadrant mode, shorts to the REF pin. In four-quadrant mode, ties to ROFS.

12

RCOM

Center Tap Point of Two Four-Quadrant Resistors, R1 and R2. In four-quadrant mode, ties to the inverting node of

the reference amplifier. In two-quadrant mode, shorts to the REF pin.

13

REF

DAC Reference Input in Two-Quadrant Mode and R2 Terminal in Four-Quadrant Mode. In two-quadrant mode, this

pin is the reference input with constant input resistance vs. code. In four-quadrant mode, this pin is driven by the

external reference amplifier.

14

IOUT

DAC Current Output. Connects to the inverting node of an external op amp for I-V conversion.

15

LDAC

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

16

WR

Write Control Digital Input in Active Low. Transfers shift-register data to the DAC register on the rising edge. The

signal level must be ≤ VDD + 0.3 V.

17

MSB

Power-On Reset State. MSB = 0 resets at zero scale; MSB = 1 resets at midscale. The signal level must be

≤ VDD + 0.3 V.

18

RS

Reset in Active Low. Resets to zero scale if MSB = 0, and resets to midscale if MSB = 1. The signal level must be

≤ VDD + 0.3 V.

19

GND

Analog and Digital Grounds.

20 to 21

D15 to D14

Digital Input Data Bits[D15:D14]. The signal level must be ≤ VDD + 0.3 V.

22 to 27

D13 to D8

Digital Input Data Bits[D13:D8]. The signal level must be ≤ VDD + 0.3 V.

28

VDD

Positive Power Supply Input. Specified range of operation: 2.7 V to 5.5 V.

Table 4. AD5556 Pin Function Descriptions

Pin No.

Mnemonic

Description

1 to 6

D5 to D0

Digital Input Data Bits[D5:D0]. The signal level must be

≤ VDD+0.3 V.

7 to 8

NC

No Connection. The user should not connect anything other than dummy pads on these terminals.

9

ROFS

Bipolar Offset Resistor. Accepts up to ±18 V. In two-quadrant mode, ties to RFB. In four-quadrant mode, ties to R1

and the external reference.

10

RFB

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

11

R1

Four-Quadrant Resistor R1. In two-quadrant mode, shorts to the REF pin. In four-quadrant mode, ties to ROFS.

12

RCOM

Center Tap Point of Two Four-Quadrant Resistors, R1 and R2. In four-quadrant mode, ties to the inverting node of

the reference amplifier. In two-quadrant mode, shorts to the REF pin.

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