Data Sheet

AD5546/AD5556

Rev. D | Page 7 of 20

Pin No.

Mnemonic

Description

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

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

15

LDAC

16

WR

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

17

MSB

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

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

19

GND

Analog and Digital Grounds.

20 to 27

D13 to D6

28

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