AD5556 Analog Devices, AD5556 Datasheet - Page 14

• Manufacturer Part Number: AD5556
• Description: Current-Output Parallel-Input, 14-Bit Digital-to-Analog Converter
• Manufacturer: Analog Devices

Specifications of AD5556

• 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

AD5546/AD5556
Table 10. AD5546 Output vs. Code
D in Binary
1111 1111 1111 1111
1000 0000 0000 0001
1000 0000 0000 0000
0111 1111 1111 1111
0000 0000 0000 0000
AC REFERENCE SIGNAL ATTENUATOR
Besides handling digital waveforms decoded from parallel input
data, the AD5546/AD5556 handle equally well low frequency
+10V
–10V
+5V
1µF
C1
+5V
1F
C1
16/14 DATA
0.1µF
LDAC
MSB
C2
WR
RS
0.1F
V
+V
+V
0
–V
–V
OUT
C2
REF
REF
REF
REF
V
ADR03
GND
IN
(1/32,768)
(32,767/32,768)
(1/32,768)
16-/14-BIT
2
U3
4
TRIM
V
DATA
OUT
0.1µF
LDAC
MSB
VDD
WR
C3
RS
5
6
R1A
AD5546/AD5556
WR
470kΩ
R1
R3
LDAC
Figure 22. Signal Attenuator with AC Reference
AD5170
B
10kΩ
R7
1kΩ
RCOMA
U1
V
U4
DD
+
OP2177
–
R1A
RS
AD5546/AD5556
WR
+2.5V
U2A
R1
Figure 23. Full Span Calibration
LDAC
C7
R2
MSB
R
U1
VREFA
Rev. D | Page 14 of 20
COMA
+
AD8628
–
RS
–5V
V+
U2A
V–
R2
MSB
0.1µF
1µF
C7
C8
C9
VREFA
ROFSA
ROFS
16/14-BIT
–2.5V
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.
R
R
OFSA
RFBA
OFS
RFB
16-/14-BIT
DATA
GND
R
R
FBA
FB
GND
IOUT
I
OUT
C6
–
OP2177
+
+15V
–15V
C6
V+
V–
U2B
–
AD8628
+
+5V
V+
V–
U2B
0.1F
0.1F
1F
1F
C4
C5
C8
C9
0.1µF
1µF
C4
C5
0V TO +2.5V
VOUT
VOUT
Data Sheet