AD5547_15 Datasheet, PDF (17/20 Pages) Analog Devices – Dual-Current Output, Parallel Input, 16-/14-Bit Multiplying DACs with 4-Quadrant Resistors

Data Sheet
AD5547/AD5557
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 24).
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 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.
U2A
+10V
–10V
+5V
OP2177
C7
C1
C2
1µF 0.1µF
16/14 DATA
WR
LDAC
RS
MSB
A0, A1
R_1A
VDD R1
R_COMA V_REFA
R2
AD5547/AD5557
U1
WR LDAC RS MSB A0, A1
2
R_OFSA R_FBA
C6
ROFS RFB
16-/14-BIT
I_OUTA
AGNDA
Figure 24. Signal Attenuator with AC Reference
+15V
C4 1µF
U2B
C5 0.1µF
+V
OP2177
–V
C8 1µF
C9 0.1µF
V_OUTA
–15V
+5V
C1
1µF
C2
0.1µF
2
AD5170
U3
V_IN
5 ^R3
TRIM
U4
10kΩ
V_{OUT 6} ^{470kΩ B}
GND
R7 1kΩ
4 ADR03
+2.5V
U2
AD8628
C7
–2.5V
C3
0.1µF
16/14 DATA
WR
LDAC
REF 01/AD RS
MSB
A0, A1
R_1A
VDD R1
R_COMA V_REFA
R2
AD5547/AD5557
U1
WR LDAC RS MSB A0, A1
R_OFSA
R_FBA
C6
ROFS
RFB
16-/14-BIT
I_OUTA
AGNDA
2
Figure 25. Full-Span Calibration
+5V
C4 1µF
U2B
C5 0.1µF
+V
AD8628
–V
V_OUTA
0V TO +2.5V
Rev. D | Page 17 of 20