AD5546 查看數據表（PDF） - Analog Devices
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AD5546 Datasheet PDF : 16 Pages
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AD5546/AD5556
PIN CONFIGURATIONS AND FUNCTIONAL DESCRIPTIONS
D7 1
D6 2
28 VDD
27 D8
D5 3
26 D9
D4 4
25 D10
D3 5
24 D11
D2 6 AD5546 23 D12
D1 7 TOP VIEW 22 D13
D0 8 (Not to Scale) 21 D14
ROFS 9
RFB 10
R1 11
20 D15
19 GND
18 RS
RCOM 12
REF 13
17 MSB
16 WR
IOUT 14
15 LDAC
Figure 3.AD5546 Pin Configuration
D5 1
D4 2
28 VDD
27 D6
D3 3
26 D7
D2 4
25 D8
D1 5
24 D9
D0 6 AD5556 23 D10
NC 7 TOP VIEW 22 D11
NC 8 (Not to Scale) 21 D12
ROFS 9
RFB 10
R1 11
20 D13
19 GND
18 RS
RCOM 12
REF 13
17 MSB
16 WR
IOUT 14
15 LDAC
NC = NO CONNECT
Figure 4. AD5556 Pin Configuration
Table 3. AD5546 Functional Descriptions
Pin No. Mnemonic Description
1–8
D7 to D0 Digital Input Data Bits D7 to D0. Signal level must be ≤ VDD + 0.3 V.
9
ROFS
Bipolar Offset Resistor. Accepts up to ±18 V. In 2-quadrant mode ties to RFB. In 4-quadrant mode ties to R1 and
external reference.
10
RFB
Internal Matching Feedback Resistor. Connects to the output of an external op amp for I-V conversion.
11
R1
4-Quandrant Resistor R1. In 2-quadrant mode shorts to REF pin. In 4-quadrant mode ties to ROFS.
12
RCOM
Center Tap Point of Two 4-Quadrant Resistors, R1 and R2. In 4-quadrant mode, ties to the inverting node of the
reference amplifier. In 2-quadrant mode, shorts to REF pin.
13
REF
DAC Reference Input in 2-Quadrant Mode and R2 Terminal in 4-Quadrant Mode. In 2-quadrant mode, this is the
reference input with constant input resistance versus code. In 4-quadrant mode, this pin is driven by the external
reference amplifier.
14
IOUT
DAC Current Output. Connects to the inverting node of an external op amp for I-V conversion.
15
LDAC
Digital Input Load DAC Control. Signal level must be ≤ VDD + 0.3 V.
16
WR
Write Control Digital Input in Active Low. Transfers shift-register data to DAC register on rising edge. Signal level
must be ≤ VDD + 0.3 V.
17
MSB
Power-On Reset State. MSB = 0 resets at zero scale, MSB = 1 resets at midscale. Signal level must be ≤ VDD + 0.3 V.
18
RS
Reset in Active Low. Resets to zero scale if MSB = 0, and resets to midscale if MSB = 1. Signal level must be
≤ VDD + 0.3 V.
19
GND
Analog and Digital Grounds.
20–21 D15 to D14 Digital Input Data Bits D15 to D14. Signal level must be ≤ VDD + 0.3 V.
22–27 D13 to D8 Digital Input Data Bits D13 to D8. Signal level must be ≤ VDD + 0.3 V.
28
VDD
Positive Power Supply Input. Specified range of operation: 2.7 V to 5.5 V.
Table 4. AD5556 Functional Descriptions
Pin No. Mnemonic Description
1–6
D5 to D0 Digital Input Data Bits D5 to D0. Signal level must be ≤ VDD+0.3 V.
7–8
NC
No Connection. User should not connect anything other than dummy pads on these terminals.
9
ROFS
Bipolar Offset Resistor. Accepts up to ±18 V. In 2-quadrant mode ties to RFB. In 4-quadrant mode ties to R1 and
external reference.
10
RFB
Internal Matching Feedback Resistor. Connects to the output of an external op amp for I-V conversion.
11
R1
4-Quandrant Resistor R1. In 2-quadrant mode shorts to REF pin. In 4-quadrant mode ties to ROFS.
12
RCOM
Center Tap Point of Two 4-Quadrant Resistors, R1 and R2. In 4-quadrant mode, ties to the inverting node of the
reference amplifier. In 2-quadrant mode, shorts to REF pin.
13
REF
DAC Reference Input in 2-Quadrant Mode and R2 Terminal in 4-Quadrant Mode. In 2-quadrant mode, this is the
reference input with constant input resistance versus code. In 4-quadrant mode, this pin is driven by the external
reference amplifier.
14
IOUT
DAC Current Output. Connects to the inverting node of an external op amp for I-V conversion.
Rev. 0 | Page 6 of 16
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