+5V, Serial-Input, Voltage-Output, 16-Bit DACs

6

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________________________________________________Pin Descriptions (continued)

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CS

SCLK

DIN

LDAC*

*MAX542 ONLY

D15

D14

D0

Figure 1. Timing Diagram

+5V Supply Voltage

Digital Ground

DGND

12

LDAC Input. A falling edge updates the internal DAC latch.

LDAC

11

Serial Data Input

DIN

10

No Connection. Not internally connected.

N.C.

9

Serial Clock Input. Duty cycle must be between 40% and 60%.

SCLK

8

Chip-Select Input

CS

7

Voltage Reference Input (force). Connect REFF to external +2.5V reference.

REFF

6

Voltage Reference Input (sense). Connect REFS to external +2.5V reference.

REFS

5

Analog Ground (sense)

AGNDS

4

Analog Ground (force)

AGNDF

3

DAC Output Voltage

OUT

2

Feedback Resistor. Connect to external op amp’s output in bipolar mode.

RFB

1

FUNCTION

NAME

PIN

Junction of internal scaling resistors. Connect to external op amp’s inverting input in

bipolar mode.

INV

13

14

MAX542