DAC8734_091 Datasheet, PDF (8/41 Pages) Texas Instruments – Quad, 16-Bit, High-Accuracy, ±16V Output, Serial Input DIGITAL-TO-ANALOG CONVERTER

DAC8734
SBAS465A – MAY 2009 – REVISED SEPTEMBER 2009 .................................................................................................................................................. www.ti.com
PIN DESCRIPTIONS (continued)
PIN
NAME
R_FB2-0 ⁽¹⁾
R_FB1-0 ⁽¹⁾
SGND-0
SGND-1
R_FB1-1 ⁽¹⁾
R_FB2-1 ⁽¹⁾
V_OUT-1
AV_DD
AGND
AV_SS
REFGND-A
REF-A
REF-B
REFGND-B
V_MON
V_OUT-3
R_FB2-3 ⁽¹⁾
R_FB1-3 ⁽¹⁾
SGND-3
SGND-2
R_FB1-2 ⁽¹⁾
R_FB2-2 ⁽¹⁾
V_OUT-2
AIN
UNI/BIP-B
NC
PIN NO.
QFN-40
TQFP-48
14
16
15
17
16
18
17
20
18
21
19
22
20
23
21, 30
26, 35
22
27
23, 28
28, 33
24
29
25
30
26
31
27
32
29
34
31
38
32
39
33
40
34
41
35
43
36
44
37
45
38
46
39
47
40
48
1, 12, 19,
—
24, 25, 36,
37, 42
I/O
DESCRIPTION
O DAC-0 R_FB2 feedback
O DAC-0 R_FB1 feedback
I DAC-0 signal ground. Connected to REFGND-A.
I DAC-1 signal ground. Connected to REFGND-A.
O DAC-1 R_FB1 feedback
O DAC-1 R_FB2 feedback
O DAC-1 output
I Positive analog power supply
I Analog ground
I Negative analog power supply
I Reference REF-A ground. Connect to AGND.
I Group A (DAC-0, DAC-1) reference input
I Group B (DAC-2, DAC-3) reference input
I Reference REF-B ground. Connect to AGND.
O
Analog monitor output. This pin is either in Hi-Z status, or connected to one of the four DAC outputs
or AIN, depending on the content of the Monitor Register.
O DAC-3 output
O DAC-3 R_FB2 feedback
O DAC-3 R_FB1 feedback
I DAC-3 signal ground. Connected to REFGND-B.
I DAC-2 signal ground. Connected to REFGND-B.
O DAC-2 R_FB1 feedback
O DAC-2 R_FB2 feedback
O DAC-2 output
I Auxiliary analog input. Connected to the analog monitor mux.
Output mode selection of group B (DAC-2 and DAC-3). When UNI/BIP-A is tied to IOV_DD, group B
I
is in unipolar output mode; when tied to DGND, group B is in bipolar output mode.
The input data written to the DAC are straight binary for unipolar output mode, and twos
complement for bipolar output mode.
Not connected
(1) To set the DAC-x gain = 2, connect R_FB1-x and R_FB2-x to V_OUT-x, and set the corresponding GAIN bit in the Command Register to '0'.
To set the DAC-x gain = 4, connect R_FB1-x to V_OUT-x, keep R_FB2-x open, and set the corresponding GAIN bit in the Command Register
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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