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AD5546 Datasheet(PDF) 6 Page - Analog Devices

Part # AD5546
Description  Current Output, Parallel Input, 16-/14-Bit Multiplying DACs with 4-Quadrant Resistors
PDF  16 Pages
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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
Rev. 0 | Page 6 of 16
PIN CONFIGURATIONS AND FUNCTIONAL 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 3.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 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.



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