Data Sheet

AD5428/AD5440/AD5447

Rev. C | Page 9 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

DB11

DAC A/B

DGND

AGND

DB0 (LSB)

DB10

DB9

DB6

DB7

DB8

DB1

DB2

DB5

DB4

DB3

AD5447

TOP VIEW

(Not to Scale)

Figure 6. Pin Configuration 24-Lead TSSOP (RU-24)

Table 6. AD5447 Pin Function Descriptions

Pin No.

Mnemonic

Description

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 to 18

DB11 to DB0

Parallel Data Bits 11 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 the contents of the DAC register. When CS and R/W are held low, the latches are transparent.

Any changes on the data lines are reflected in the relevant DAC output.

21

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