AD5546 Analog Devices, AD5546 Datasheet - Page 13

• Manufacturer Part Number: AD5546
• Description: Current-Output Parallel-Input, 16-Bit Digital-to-Analog Converter
• Manufacturer: Analog Devices

Specifications of AD5546

• Resolution (bits): 16bit
• 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
BIPOLAR MODE
Four-Quadrant Multiplying Mode, V
The AD5546/AD5556 contain on-chip all the four-quadrant
resistors necessary for the precision bipolar multiplying
operation. Such a feature minimizes the number of exponent
components to only a voltage reference, dual op amp, and
compensation capacitor (see Figure 21). For example, with a
+10V
–10V
+5V
1µF
5V
C1
16-/14-BIT
LDAC
DATA
MSB
WR
RS
16-/14-BIT
V
GND
ADR03
LDAC
0.1µF
IN
MSB
DATA
2
U3
WR
4
RS
TRIM
V
C2
OUT
5V
5
6
Figure 20. Unipolar Two-Quadrant Multiplying Mode, V
V
OUT
DD
Figure 21. Four-Quadrant Multiplying Mode, V
V
R1A
AD5546/AD5556
WR
DD
= –V
R1
R1
AD5546/AD5556
WR
LDAC
LDAC
REF
R
U1
COMA
R
U1
+
OP2177
–
COM
to +V
RS
+
OP2177
–
U2A
RS
U2A
C7
R2
MSB
C1
R2
MSB
REF
VREFA
–VREF
Rev. D | Page 13 of 20
REF
R
+VREF
OFS
R
R
R
OFS
OFSA
16-/14-BIT
OFS
16-/14-BIT
DATA
DATA
10 V reference, the circuit yields a precision, bipolar –10 V to
+10 V output.
AD5546
AD5556
Table 10 shows some of the results for the 16-bit AD5546.
R
R
FB
FB
R
R
FBA
FB
GND
V
V
GND
OUT
OUT
OUT
I
= –V
OUT
= (D/32768 − 1) × V
= (D/16384 − 1) × V
I
OUT
OUT
REF
= 0 to +V
to +V
C2
–
OP2177
+
REF
C6
U2B
REF
–
OP2177
+
+15V
–15V
–VREF TO +VREF
V+
V–
U2B
0.1µF
0.1µF
1µF
1µF
C4
C5
C8
C9
REF
REF
VOUT
AD5546/AD5556
VOUT
(5)
(6)