DAC8234

PIN DESCRIPTIONS (continued)

PIN NO.

PIN

NAME

QFN-40

TQFP-48

I/O

DESCRIPTION

(1)

14

16

O

(1)

15

17

O

SGND-0

16

18

I

DAC-0 signal ground. Connected to REFGND-A.

SGND-1

17

20

I

DAC-1 signal ground. Connected to REFGND-A.

(1)

18

21

O

(1)

19

22

O

20

23

O

DAC-1 output

21, 30

26, 35

I

Positive analog power supply

AGND

22

27

I

Analog ground

23, 28

28, 33

I

Negative analog power supply

REFGND-A

24

29

I

Reference REF-A ground. Connect to AGND.

REF-A

25

30

I

Group A (DAC-0, DAC-1) reference input

REF-B

26

31

I

Group B (DAC-2, DAC-3) reference input

REFGND-B

27

32

I

Reference REF-B ground. Connect to AGND.

Analog monitor output. This pin is either in Hi-Z status, or connected to one of the four DAC outputs

29

34

O

or AIN, depending on the content of the Monitor Register.

31

38

O

DAC-3 output

(1)

32

39

O

(1)

33

40

O

SGND-3

34

41

I

DAC-3 signal ground. Connected to REFGND-B.

SGND-2

35

43

I

DAC-2 signal ground. Connected to REFGND-B.

(1)

36

44

O

(1)

37

45

O

38

46

O

DAC-2 output

AIN

39

47

I

Auxiliary analog input. Connected to the analog monitor mux.

is in unipolar output mode; when tied to DGND, group B is in bipolar output mode.

UNI/BIP-B

40

48

I

The input data written to the DAC are straight binary for unipolar output mode, and twos

complement for bipolar output mode.

1, 12, 19,

NC

—

24, 25, 36,

Not connected

37, 42

(1)

to '1'. After power-on reset or user reset, the GAIN bits are set to '1' by default; for gain = 2, the gain bits must be cleared to '0'.

8

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