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AD5547 bảng dữ liệu(PDF) 6 Page - Analog Devices

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Giải thích chi tiết về linh kiện  Dual Current Output, Parallel Input, 16-/14-Bit Multiplying DACs with 4-Quadrant Resistors
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AD5547 bảng dữ liệu(HTML) 6 Page - Analog Devices

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AD5547/AD5557
Rev. 0 | Page 6 of 20
PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS
AD5547
TOP VIEW
(Not to Scale)
D1
1
D0
2
ROFSA 3
RFBA 4
R1A 5
VREFA 7
IOUTA 8
AGNDA
9
DGND 10
AGNDA 11
IOUTB 12
VREFB 13
RCOMB 14
R1B 15
RFBB 16
ROFSB 17
18
A0 19
D2
38
D3
37
D4
36
D5
35
D6
34
D7
33
D8
32
D9
31
D10
30
VDD
29
D11
28
D12
27
D13
26
D14
25
D15
24
23
MSB
22
LDAC
21
A1
20
RCOMA 6
WR
RS
NC
1
NC
2
ROFSA 3
RFBA 4
R1A 5
VREFA 7
IOUTA 8
AGNDA
9
DGND 10
AGNDB 11
IOUTB 12
VREFB 13
RCOMB 14
R1B 15
RFBB 16
ROFSB 17
18
A0 19
RCOMA 6
WR
NC = NO CONNECT
D0
38
D1
37
D2
36
D3
35
D4
34
D5
33
D6
32
D7
31
D8
30
VDD
29
D9
28
D10
27
D11
26
D12
25
D13
24
23
MSB
22
LDAC
21
A1
20
RS
AD5557
TOP VIEW
(Not to Scale)
Figure 4. AD5547 TSSOP-38 Pin Configuration
Figure 5. AD5557 TSSOP-38 Pin Configuration
Table 3. AD5547 Pin Function Descriptions
Pin No.
Mnemonic
Function
1, 2, 24–
28, 30–38
D0–D15
Digital Input Data Bits D0 to D15. Signal level must be ≤ VDD + 0.3 V.
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.


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