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AD5546 Datasheet(PDF) 14 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) 14 Page - Analog Devices

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AD5546/AD5556
Data Sheet
Rev. D | Page 14 of 20
Table 10. AD5546 Output vs. Code
D in Binary
VOUT
1111 1111 1111 1111
+VREF(32,767/32,768)
1000 0000 0000 0001
+VREF(1/32,768)
1000 0000 0000 0000
0
0111 1111 1111 1111
–VREF(1/32,768)
0000 0000 0000 0000
–VREF
AC REFERENCE SIGNAL ATTENUATOR
Besides handling digital waveforms decoded from parallel input
data, the AD5546/AD5556 handle equally well low frequency
ac reference signals for signal attenuation, channel equalization,
and waveform generation applications. The maximum signal
range can be up to ±18 V (see Figure 22).
SYSTEM CALIBRATION
The initial accuracy of the system can be adjusted by trimming
the voltage reference ADR0x with a digital potentiometer (see
Figure 23). The AD5170 provides an OTP (one time program-
mable), 8-bit adjustment that is ideal and reliable for such cali-
bration. The Analog Devices, Inc., OTP digital potentiometer
comes with programmable software that simplifies the factory
calibration process.
16/14-BIT
VDD
ROFS
ROFSA
VOUT
RFB
RFBA
C6
GND
U1
AD5546/AD5556
IOUT
R2
R1
RCOMA
R1A
16/14 DATA
VREFA
U2B
OP2177
–
+
C4
1
F
C5
0.1
F
C8
1
F
C9
0.1
F
+15V
–15V
WR
WR
LDAC
LDAC
RS
RS
MSB
MSB
C2
0.1
F
C1
1
F
V+
V–
U2A
OP2177
+
–
C7
+5V
+10V
–10V
Figure 22. Signal Attenuator with AC Reference
C8
0.1µF
C9
1µF
–5V
16-/14-BIT
DATA
16-/14-BIT
DATA
2
+5V
5
6
4
GND
VIN
TRIM
U3
ADR03
VOUT
VDD
ROFS
R3
470kΩ
U4
AD5170
10kΩ
B
R7
1kΩ
ROFSA
VOUT
0V TO +2.5V
RFB
RFBA
C6
GND
U1
AD5546/AD5556
IOUT
R2
R1
RCOMA
R1A
+2.5V
VREFA
U2B
AD8628
–
+
C4
1µF
C5
0.1µF
+5V
WR
WR
LDAC
LDAC
RS
RS
MSB
MSB
C2
0.1µF
C1
1µF
C3
0.1µF
V+
V–
U2A
AD8628
+
–
C7
–2.5V
V+
V–
Figure 23. Full Span Calibration


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