REV. 0

AD5330/AD5331/AD5340/AD5341

–6–

AD5331 FUNCTIONAL BLOCK DIAGRAM

BUFFER

10-BIT

DAC

DAC

REGISTER

INPUT

REGISTER

INTER-

FACE

LOGIC

POWER-DOWN

LOGIC

BUF

..

CS

WR

CLR

LDAC

PD

GND

AD5331

RESET

POWER-ON

RESET

AD5331 PIN FUNCTION DESCRIPTIONS

Pin

No.

Mnemonic

Function

Parallel Data Input.

Most Significant Bit of Parallel Data Input.

Unbuffered Reference Input.

Output of DAC. Buffered output with rail-to-rail operation.

5

GND

Ground reference point for all circuitry on the part.

6

CS

Active Low Chip Select Input. This is used in conjunction with

WR to write data to the parallel interface.

7

WR

Active Low Write Input. This is used in conjunction with

CS to write data to the parallel interface.

8

GAIN

9

CLR

Active low control input that clears all input registers and DAC registers to zero.

10

LDAC

Active low control input that updates the DAC registers with the contents of the input registers.

11

PD

Power-Down Pin. This active low control pin puts the DAC into power-down mode.

12

Power Supply Input. These parts can operate from 2.5 V to 5.5 V and the supply should be decoupled

with a 10

µF capacitor in parallel with a 0.1 µF capacitor to GND.

13–20

Eight Parallel Data Inputs.

AD5331 PIN CONFIGURATION

TOP VIEW

(Not to Scale)

20

19

18

17

16

15

14

13

12

11

1

2

3

4

5

6

7

8

9

10

AD5331

LDAC

GAIN

WR

CS

GND

PD

10-BIT

CLR