DAC8822_07 Datasheet, PDF (5/24 Pages) Burr-Brown (TI) – 16-Bit, Dual, Parallel Input, Multiplying Digital-to-Analog Converter

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PIN #
1, 2, 24-28,
30-38
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
29
NAME
D0-D15
R_OFSA
R_FBA
R₁A
R_COMA
V_REFA
I_OUTA
AGNDA
DGND
AGNDB
I_OUTB
V_REFB
R_COMB
R₁B
R_FBB
R_OFSB
WR
A0
A1
LDAC
RSTSEL
RS
V_DD
DAC8822
SBAS390A – DECEMBER 2006 – REVISED MARCH 2007
PIN ASSIGNMENTS (continued)
Table 1. TERMINAL FUNCTIONS
DESCRIPTION
Digital Input Data Bits D0 to D15. Signal level must be ≤ V_DD +0.3V. D15 is MSB.
Bipolar Offset Resistor A. Accepts up to ±18V.
In 2-quadrant mode, R_OFSA ties to R_FBA.
In 4-quadrant mode, R_OFSA ties to R₁A and the external reference.
Internal Matching Feedback Resistor A. Connects to the external op amp for I-V conversion.
4-Quadrant Resistor.
In 2-quadrant mode, R₁A shorts to the V_REFA pin.
In 4-quadrant mode, R₁A ties to R_OFSA and the reference input.
Center Tap Point of the Two 4-Quadrant Resistors, R₁A and R₂A.
In 2-quadrant mode, R_COMA shorts to the V_REF pin.
In 4-quadrant mode, R_COMA ties to the inverting node of the reference amplifier.
DAC A Reference Input in 2-Quadrant Mode, R₂ Terminal in 4-Quadrant Mode.
In 2-quadrant mode, V_REFA is the reference input with constant input resistance versus code.
In 4-quadrant mode, V_REFA is driven by the external reference amplifier.
DAC A Current Output. Connects to the inverting terminal of external precision I-V op amp for voltage
output.
DAC A Analog Ground.
Digital Ground.
DAC B Analog Ground.
DAC B Current Output. Connects to the inverting terminal of external precision I-V op amp for voltage
output.
DAC B Reference Input in 2-Quadrant Mode, R₂ Terminal in 4-Quadrant Mode.
In 2-quadrant mode, V_REFB is the reference input with constant input resistance versus code.
In 4-quadrant mode, V_REFB is driven by the external reference amplifier.
Center Tap Point of the Two 4-Quadrant Resistors, R₁B and R₂B.
In 2-quadrant mode, R_COMB shorts to the V_REF pin.
In 4-quadrant mode, R_COMB ties to the inverting node of the reference amplifier.
4-Quadrant Resistor.
In 2-quadrant mode, R₁B shorts to the V_REFB pin.
In 4-quadrant mode, R₁B ties to R_OFSB and the reference input.
Internal Matching Feedback Resistor B. Connects to external op amp for I-V conversion.
Bipolar Offset Resistor B. Accepts up to ±18V.
In 2-quadrant mode, R_OFSB ties to R_FBB.
In 4-quadrant mode, R_OFSB ties to R₁B and the external reference.
Write Control Digital Input In, Active Low. WR enables input registers.
Signal level must be ≤ V_DD + 0.3V.
Address 0. Signal level must be ≤ V_DD + 0.3V.
Address 1. Signal level must be ≤ V_DD + 0.3V.
Digital Input Load DAC Control. Signal level must be ≤ V_DD + 0.3V. See the Function of Control Inputs
table for details.
Power-On Reset State.
RSTSEL = 0 corresponds to zero-scale reset.
RSTSEL = 1 corresponds to midscale reset.
The signal level must be ≤ V_DD + 0.3V.
Reset. Active low resets both input and DAC registers.
Resets to zero-scale if RSTSEL= 0, and to midscale if RSTSEL = 1.
Signal level must be equal to or less than VDD + 0.3 V.
Positive Power Supply Input. The specified range of operation is 2.7V to 5.5V.
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