AD5557 Analog Devices, AD5557 Datasheet - Page 17

• Manufacturer Part Number: AD5557
• Description: Dual Current Output, Parallel Input, 14-Bit Multiplying DACs with 4-Quadrant Resistors
• Manufacturer: Analog Devices

Specifications of AD5557

• Resolution (bits): 14bit
• Dac Update Rate: 2MSPS
• Dac Settling Time: 500ns
• Max Pos Supply (v): +5.5V
• Single-supply: Yes
• Dac Type: Current Out
• Dac Input Format: Par

Data Sheet
AC Reference Signal Attenuator
Besides handling the digital waveform decoded from the
parallel input data, the
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 24).
+5V
1µF
C1
+10V
–10V
+5V
C2
0.1µF
AD5547/AD5557
1µF
C1
REF 01/AD
4
16/14 DATA
V
GND
IN
2
A0, A1
LDAC
16/14 DATA
ADR03
TRIM
V
MSB
0.1µF
OUT
U3
WR
RS
C2
A0, A1
LDAC
0.1µF
MSB
WR
5
6
RS
C3
470kΩ
R3
AD5170
can also handle low
VDD
R7
WR
LDAC
B
VDD
WR
10kΩ
1kΩ
AD5547/AD5557
U4
R
R1
LDAC
1A
Figure 24. Signal Attenuator with AC Reference
AD5547/AD5557
RS
+2.5V
R
R1
1A
U2A
U1
R
OP2177
RS
MSB A0, A1
COMA
Figure 25. Full-Span Calibration
R
U1
MSB A0, A1
COMA
C7
R2
AD8628
U2
V
Rev. C | Page 17 of 20
REFA
C7
R2
2
V
REFA
2
16-/14-BIT
R
–2.5V
ROFS
OFSA
R
16-/14-BIT
System Calibration
The initial accuracy of the system can be adjusted by trimming
the voltage reference ADR0x with a digital potentiometer (see
Figure 25). The
(OTP), 8-bit adjustment that is ideal and reliable for such
calibration. Analog Devices, Inc., OTP digital potentiometer
comes with programmable software that simplifies factory
calibration.
ROFS
OFSA
R
RFB
FBA
R
RFB
FBA
AGNDA
I
AGNDA
OUTA
AD5170
I
OUTA
C6
C6
provides a one-time programmable
U2B
OP2177
+15V
U2B
+V
–V
–15V
AD8628
C4
C5
C8
C9
+V
–V
+5V
0.1µF
0.1µF
C4
C5
1µF
1µF
AD5547/AD5557
0.1µF
1µF
0V TO +2.5V
V
OUTA
V
OUTA