REV. 0

AD5330/AD5331/AD5340/AD5341

–7–

AD5340 FUNCTIONAL BLOCK DIAGRAM

BUFFER

12-BIT

DAC

DAC

REGISTER

INPUT

REGISTER

INTER-

FACE

LOGIC

POWER-DOWN

LOGIC

BUF

GAIN

..

CS

WR

CLR

LDAC

PD

GND

AD5340

POWER-ON

RESET

RESET

AD5340 PIN FUNCTION DESCRIPTIONS

Pin

No.

Mnemonic

Function

Parallel Data Input.

Most Significant Bit of Parallel Data Input.

3

BUF

Buffer Control Pin. This pin controls whether the reference input to the DAC is buffered or unbuffered.

Reference Input.

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

6

NC

No Connect.

7

GND

Ground reference point for all circuitry on the part.

8

CS

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

WR to write data to the parallel interface.

9

WR

Active Low Write Input. This is used in conjunction with

CS to write data to the parallel interface.

10

GAIN

11

CLR

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

12

LDAC

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

13

PD

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

14

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.

15–24

10 Parallel Data Inputs.

AD5340 PIN CONFIGURATION

TOP VIEW

(Not to Scale)

24

23

22

21

20

19

18

17

16

15

14

13

1

2

3

4

5

6

7

8

9

10

11

12

AD5340

LDAC

GAIN

WR

CS

GND

PD

12-BIT

BUF

CLR

NC

NC = NO CONNECT