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AD5546 Datasheet(PDF) 6 Page - Analog Devices

Part # AD5546
Description  Current Output, Parallel Input, 16-/14-Bit Multiplying DACs with Four-Quadrant Resistors
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD5546 Datasheet(HTML) 6 Page - Analog Devices

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AD5546/AD5556
Data Sheet
Rev. D | Page 6 of 20
PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS
AD5546
TOP VIEW
(Not to Scale)
D7
1
VDD
28
D6
2
D8
27
D5
3
D9
26
D4
4
D10
25
D3
5
D11
24
D2
6
D12
23
D1
7
D13
22
D0
8
D14
21
ROFS 9
D15
20
RFB 10
GND
19
R1 11
RS
18
RCOM 12
MSB
17
REF 13
WR
16
IOUT 14
LDAC
15
Figure 4. AD5546 Pin Configuration
AD5556
TOP VIEW
(Not to Scale)
NC = NO CONNECT
D5
1
VDD
28
D4
2
D6
27
D3
3
D7
26
D2
4
D8
25
D1
5
D9
24
D0
6
D10
23
NC
7
D11
22
NC
8
D12
21
ROFS 9
D13
20
RFB 10
GND
19
R1 11
RS
18
RCOM 12
MSB
17
REF 13
WR
16
IOUT 14
LDAC
15
Figure 5. AD5556 Pin Configuration
Table 3. AD5546 Pin Function Descriptions
Pin No.
Mnemonic
Description
1 to 8
D7 to D0
Digital Input Data Bits[D7: D0]. The signal level must be ≤ VDD + 0.3 V.
9
ROFS
Bipolar Offset Resistor. Accepts up to ±18 V. In two-quadrant mode, ties to RFB. In four-quadrant mode, ties to R1
and the external reference.
10
RFB
Internal Matching Feedback Resistor. Connects to the output of an external op amp for I-V conversion.
11
R1
Four-Quadrant Resistor R1. In two-quadrant mode, shorts to the REF pin. In four-quadrant mode, ties to ROFS.
12
RCOM
Center Tap Point of Two Four-Quadrant Resistors, R1 and R2. In four-quadrant mode, ties to the inverting node of
the reference amplifier. In two-quadrant mode, shorts to the REF pin.
13
REF
DAC Reference Input in Two-Quadrant Mode and R2 Terminal in Four-Quadrant Mode. In two-quadrant mode, this
pin is the reference input with constant input resistance vs. code. In four-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 the DAC register on the rising edge. The
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. The 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. The signal level must be
≤ VDD + 0.3 V.
19
GND
Analog and Digital Grounds.
20 to 21
D15 to D14
Digital Input Data Bits[D15:D14]. The signal level must be ≤ VDD + 0.3 V.
22 to 27
D13 to D8
Digital Input Data Bits[D13:D8]. The 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 Pin Function Descriptions
Pin No.
Mnemonic
Description
1 to 6
D5 to D0
Digital Input Data Bits[D5:D0]. The signal level must be
≤ VDD+0.3 V.
7 to 8
NC
No Connection. The user should not connect anything other than dummy pads on these terminals.
9
ROFS
Bipolar Offset Resistor. Accepts up to ±18 V. In two-quadrant mode, ties to RFB. In four-quadrant mode, ties to R1
and the external reference.
10
RFB
Internal Matching Feedback Resistor. Connects to the output of an external op amp for I-V conversion.
11
R1
Four-Quadrant Resistor R1. In two-quadrant mode, shorts to the REF pin. In four-quadrant mode, ties to ROFS.
12
RCOM
Center Tap Point of Two Four-Quadrant Resistors, R1 and R2. In four-quadrant mode, ties to the inverting node of
the reference amplifier. In two-quadrant mode, shorts to the REF pin.


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