AD5557(Rev0) 查看數據表（PDF） - Analog Devices
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产品描述 (功能)
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AD5557
(Rev.:Rev0)
(Rev.:Rev0)
Analog Devices
AD5557 Datasheet PDF : 20 Pages
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AD5547/AD5557
Pin No.
18
19
20
21
22
23
29
Mnemonic
WR
A0
A1
LDAC
MSB
RS
VDD
Function
Write Control Digital Input In, Active Low. WR transfers shift register data to the DAC register on the rising edge.
Signal level must be ≤ VDD + 0.3 V.
Address Pin 0. Signal level must be ≤ VDD + 0.3 V.
Address Pin 1. Signal level must be ≤ VDD + 0.3 V.
Digital Input Load DAC Control. Signal level must be ≤ VDD + 0.3 V.
Power-On Reset State. MSB = 0 corresponds to zero-scale reset; MSB = 1 corresponds to midscale reset. The
signal level must be ≤ VDD + 0.3 V.
Active low resets both input and DAC registers. Resets to zero-scale if MSB = 0, and to midscale if MSB = 1. Signal
level must be ≤ VDD + 0.3 V.
Positive Power Supply Input. The specified range of operation is 2.7 V to 5.5 V.
Table 4. AD5557 Pin Function Descriptions
Pin No. Mnemonic Function
1, 2
NC
No Connection. Do not connect anything other than dummy pads to these pins.
3
ROFSA
Bipolar Offset Resistor A. Accepts up to ±18 V. 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.
5
R1A
4-Quandrant Resistor. In 2-quadrant mode, R1A shorts to the VREFA pin. In 4-quadrant mode, R1A ties to ROFSA. Do not
connect when operating in unipolar mode.
6
RCOMA
Center Tap Point of the Two 4-Quadrant Resistors, R1A and R2A. In 4-quadrant mode, RCOMA ties to the inverting node
of the reference amplifier. In 2-quadrant mode, RCOMA shorts to the VREF pin. Do not connect if operating in
unipolar mode.
7
VREFA
DAC A Reference Input in 2-Quadrant Mode, R2 Terminal in 4-Quadrant Mode. 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.
8
IOUTA
DAC A Current Output. Connects to the inverting terminal of external precision I-V op amp for voltage output.
9
AGNDA
DAC A Analog Ground.
10
DGND
Digital Ground.
11
AGNDB
DAC B Analog Ground.
12
IOUTB
DAC B Current Output. Connects to inverting terminal of external precision I-V op amp for voltage output.
13
VREFB
DAC B Reference Input Pin. Establishes DAC full-scale voltage. Constant input resistance versus code. If configured
with an external op amp for 4-quadrant multiplying, VREFB becomes –VREF.
14
RCOMB
Center Tap Point of the Two 4-Quadrant Resistors, R1B and R2B. In 4-quadrant mode, RCOMB ties to the inverting node
of the reference amplifier. In 2-quadrant mode, RCOMB shorts to the VREF pin. Do not connect if operating in
unipolar mode.
15
R1B
4-Quandrant Resistor. In 2-quadrant mode, R1B shorts to the VREFB pin. In 4-quadrant mode, R1B ties to ROFSB. Do not
connect if operating in unipolar mode.
16
RFBB
Internal Matching Feedback Resistor B. Connects to external op amp for I-V conversion.
17
ROFSB
Bipolar Offset Resistor B. Accepts up to ±18 V. In 2-quadrant mode, ROFSB ties to RFBB. In 4-quadrant mode, ROFSB ties
to R1B and an external reference.
18
WR
Write Control Digital Input In, Active Low. Transfers shift register data to the DAC register on the rising edge. Signal
level must be ≤ VDD + 0.3 V.
19
A0
Address Pin 0. Signal level must be ≤ VDD + 0.3 V.
20
A1
Address Pin 1. Signal level must be ≤ VDD + 0.3 V.
21
LDAC
Digital Input Load DAC Control. Signal level must be ≤ VDD + 0.3 V.
22
MSB
Power-On Reset State. MSB = 0 corresponds to zero-scale reset; MSB = 1 corresponds to midscale reset. The signal
level must be ≤ VDD + 0.3 V.
23
RS
Active low resets both input and DAC registers. Resets to zero-scale if MSB = 0, and to midscale if MSB = 1. Signal
level must be ≤ VDD + 0.3 V.
24–28, D13 to D0 Digital Input Data Bits D13 to D0. Signal level must be ≤ VDD + 0.3 V.
30–38
29
VDD
Positive Power Supply Input. The specified range of operation is 2.7 V to 5.5 V.
Rev. 0 | Page 7 of 20
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