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DAC8805Q Scheda tecnica(PDF) 5 Page - Texas Instruments

Il numero della parte DAC8805Q
Spiegazioni elettronici  14-Bit, Dual, Parallel Input, Multiplying Digital-to-Analog Converter
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Produttore elettronici  TI1 [Texas Instruments]
Homepage  http://www.ti.com
Logo TI1 - Texas Instruments

DAC8805Q Scheda tecnica(HTML) 5 Page - Texas Instruments

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DAC8805
SBAS391A – DECEMBER 2006 – REVISED MAY 2007
PIN ASSIGNMENTS (continued)
Table 1. TERMINAL FUNCTIONS
PIN #
NAME
DESCRIPTION
1, 2
NC
No connection
Bipolar Offset Resistor A. Accepts up to
±18V.
3
ROFSA
In 2-quadrant mode, ROFSA ties to RFBA.
In 4-quadrant mode, ROFSA ties to R1A and the external reference.
4
RFBA
Internal Matching Feedback Resistor A. Connects to the external op amp for I-V conversion.
4-Quadrant Resistor.
5
R1A
In 2-quadrant mode, R1A shorts to the VREFA pin.
In 4-quadrant mode, R1A ties to ROFSA and the reference input.
Center Tap Point of the Two 4-Quadrant Resistors, R1A and R2A.
6
RCOMA
In 2-quadrant mode, RCOMA shorts to the VREF pin.
In 4-quadrant mode, RCOMA ties to the inverting node of the reference amplifier.
DAC A Reference Input in 2-Quadrant Mode, R2 Terminal in 4-Quadrant Mode.
7
VREFA
In 2-quadrant mode, VREFA is the reference input with constant input resistance versus code.
In 4-quadrant mode, VREFA 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
8
IOUTA
output.
9
AGNDA
DAC A Analog Ground.
10
DGND
Digital Ground.
11
AGNDB
DAC B Analog Ground.
DAC B Current Output. Connects to the inverting terminal of external precision I-V op amp for voltage
12
IOUTB
output.
DAC B Reference Input in 2-Quadrant Mode, R2 Terminal in 4-Quadrant Mode.
13
VREFB
In 2-quadrant mode, VREFB is the reference input with constant input resistance versus code.
In 4-quadrant mode, VREFB is driven by the external reference amplifier.
Center Tap Point of the Two 4-Quadrant Resistors, R1B and R2B.
14
RCOMB
In 2-quadrant mode, RCOMB shorts to the VREF pin.
In 4-quadrant mode, RCOMB ties to the inverting node of the reference amplifier.
4-Quadrant Resistor.
15
R1B
In 2-quadrant mode, R1B shorts to the VREFB pin.
In 4-quadrant mode, R1B ties to ROFSB and the reference input.
16
RFBB
Internal Matching Feedback Resistor B. Connects to external op amp for I-V conversion.
Bipolar Offset Resistor B. Accepts up to
±18V.
17
ROFSB
In 2-quadrant mode, ROFSB ties to RFBB.
In 4-quadrant mode, ROFSB ties to R1B and the external reference.
Write Control Digital Input In, Active Low. WR enables input registers.
18
WR
Signal level must be
≤ V
DD + 0.3V.
19
A0
Address 0. Signal level must be
≤ V
DD + 0.3V.
20
A1
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
21
LDAC
table for details.
Power-On Reset State.
RSTSEL = 0 corresponds to zero-scale reset.
22
RSTSEL
RSTSEL = 1 corresponds to mid-scale reset.
The signal level must be
≤ V
DD + 0.3V.
Reset. Active low resets both input and DAC registers.
23
RS
Resets to zero-scale if RSTSEL= 0, and to mid-scale if RSTSEL = 1.
Signal level must be equal to or less than VDD + 0.3 V.
24-28, 30-38
D0-D13
Digital Input Data Bits D0 to D13. Signal level must be
≤ V
DD +0.3V. D13 is MSB.
29
VDD
Positive Power Supply Input. The specified range of operation is 2.7V to 5.5V.
5
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