AD5428/AD5440/AD5447

Data Sheet

Rev. D | Page 8 of 32

R/W

CS

1

2

3

4

5

6

7

8

9

10

20

21

22

23

24

19

18

17

16

15

14

13

12

11

DB9

DAC A/B

DGND

AGND

NC

DB8

DB7

DB4

DB5

DB6

NC

DB0 (LSB)

DB3

DB2

DB1

AD5440

TOP VIEW

(Not to Scale)

NC = NO CONNECT

Figure 5. Pin Configuration 24-Lead TSSOP (RU-24)

Table 5. AD5440 Pin Function Descriptions

Pin No.

Mnemonic

Function

1

AGND

DAC Ground Pin. This pin should typically be tied to the analog ground of the system, but can be biased to

achieve single-supply operation.

2, 24

DAC Current Outputs.

3, 23

DAC Feedback Resistor Pins. Establish voltage output for the DAC by connecting to an external amplifier output.

4, 22

DAC Reference Voltage Input Terminals.

5

DGND

Digital Ground Pin.

6

DAC A/B

Selects DAC A or DAC B. Low selects DAC A; high selects DAC B.

7 to16

DB9 to DB0

Parallel Data Bits 9 Through 0.

19

CS

Chip Select Input. Active low. Used in conjunction with R/W to load parallel data to the input latch or to read

data from the DAC register.

20

R/W

Read/Write. When low, used in conjunction with CS to load parallel data. When high, used in conjunction with

CS to read back contents of the DAC register.

21

Positive Power Supply Input. This part can be operated from a supply of 2.5 V to 5.5 V.