Power-Supply Considerations

On power-up, all input and DAC registers are cleared

(set to zero code) and DOUT is in Mode 0 (serial data

is shifted out of DOUT on the clock’s falling edge).

For rated MAX5253 performance, limit REFAB/REFCD

capacitor in parallel with a 0.1µF capacitor to AGND.

Use short lead lengths and place the bypass capaci-

tors as close to the supply pins as possible.

Grounding and Layout Considerations

Digital or AC transient signals between AGND and

DGND can create noise at the analog outputs. Tie

AGND and DGND together at the DAC, then tie this

point to the highest-quality ground available.

Good printed circuit board ground layout minimizes

crosstalk between DAC outputs, reference inputs, and

digital inputs. Reduce crosstalk by keeping analog

lines away from digital lines. Wire-wrapped boards are

not recommended.

+3V, Quad, 12-Bit Voltage-Output DAC

with Serial Interface

______________________________________________________________________________________

15

DAC_

MAX5253

REF_

OUT_

R

2N3904

FB_

Figure 13. Digitally Programmable Current Source

__________________Pin Configuration

20

19

18

17

16

15

14

13

1

2

3

4

5

6

7

8

FBD

OUTD

OUTC

OUTB

OUTA

FBA

AGND

TOP VIEW

FBC

REFCD

PDL

UPO

CS

CL

REFAB

FBB

12

11

9

10

DOUT

DGND

SCLK

DIN

DIP/SSOP

MAX5253