AD5557CRU-REEL7 Analog Devices Inc, AD5557CRU-REEL7 Datasheet - Page 17

• Manufacturer Part Number: AD5557CRU-REEL7
• Description: IC,D/A CONVERTER,DUAL,14-BIT,TSSOP,38PIN
• Manufacturer: Analog Devices Inc

Specifications of AD5557CRU-REEL7

• Design Resources: Precision, Unipolar, Inverting Conversion Using AD5547/57 DAC (CN0026) Precision, Unipolar, Noninverting Configuration for the AD5547/57 DAC (CN0027) Precision, Bipolar, Configuration for AD5547/AD5557 DAC (CN0028)
• Settling Time: 500ns
• Number Of Bits: 14
• Data Interface: Parallel
• Number Of Converters: 2
• Voltage Supply Source: Single Supply
• Power Dissipation (max): 55µW
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 38-TSSOP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

AC Reference Signal Attenuator
Besides handling the digital waveform decoded from the
parallel input data, the AD5547/AD5557 can also handle 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 23).
+5V
1µF
C1
+10V
–10V
+5V
C2
0.1µF
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
VDD
R7
WR
LDAC
B
VDD
WR
10kΩ
1kΩ
AD5547/AD5557
U4
R
R1
LDAC
1A
Figure 23. Signal Attenuator with AC Reference
AD5547/AD5557
RS
+2.5V
R
R1
1A
U2A
U1
R
OP2177
RS
MSB A0, A1
COMA
Figure 24. Full-Span Calibration
R
U1
MSB A0, A1
COMA
C7
R2
AD8628
U2
V
Rev. B | 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 24). The AD5170 provides a one-time programmable
(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
I
OUTA
C6
C6
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