+5V, Serial-Input, Voltage-Output, 14-Bit DACs

6

_______________________________________________________________________________________

Pin Descriptions (continued)

;;

;;

;;;;;;;;;

;;

;;

CS

SCLK

DIN

LDAC*

*MAX545 ONLY

D13

D12

S0

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

MAX545