AD5546 datasheet(6/16 Pages) AD

Part #	AD5546

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

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Manufacturer	AD [Analog Devices]

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AD5546/AD5556

Rev. 0 | Page 6 of 16

PIN CONFIGURATIONS AND FUNCTIONAL 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 3.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 4. AD5556 Pin Configuration

Table 3. AD5546 Functional Descriptions

Pin No.

Mnemonic

Description

1–8

D7 to D0

Digital Input Data Bits D7 to D0. Signal level must be ≤ VDD + 0.3 V.

9

ROFS

Bipolar Offset Resistor. Accepts up to ±18 V. In 2-quadrant mode ties to RFB. In 4-quadrant mode ties to R1 and

external reference.

10

RFB

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

11

R1

4-Quandrant Resistor R1. In 2-quadrant mode shorts to REF pin. In 4-quadrant mode ties to ROFS.

12

RCOM

Center Tap Point of Two 4-Quadrant Resistors, R1 and R2. In 4-quadrant mode, ties to the inverting node of the

reference amplifier. In 2-quadrant mode, shorts to REF pin.

13

REF

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

reference input with constant input resistance versus code. In 4-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 DAC register on rising edge. 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. 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. Signal level must be

≤ VDD + 0.3 V.

19

GND

Analog and Digital Grounds.

20–21

D15 to D14

Digital Input Data Bits D15 to D14. Signal level must be ≤ VDD + 0.3 V.

22–27

D13 to D8

Digital Input Data Bits D13 to D8. 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 Functional Descriptions

Pin No.

Mnemonic

Description

1–6

D5 to D0

Digital Input Data Bits D5 to D0. Signal level must be

≤ VDD+0.3 V.

7–8

NC

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

9

ROFS

Bipolar Offset Resistor. Accepts up to ±18 V. In 2-quadrant mode ties to RFB. In 4-quadrant mode ties to R1 and

external reference.

10

RFB

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

11

R1

4-Quandrant Resistor R1. In 2-quadrant mode shorts to REF pin. In 4-quadrant mode ties to ROFS.

12

RCOM

Center Tap Point of Two 4-Quadrant Resistors, R1 and R2. In 4-quadrant mode, ties to the inverting node of the

reference amplifier. In 2-quadrant mode, shorts to REF pin.

13

REF

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

reference input with constant input resistance versus code. In 4-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.

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