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AD7541ATQ Datasheet(数据表) 5 Page - Analog Devices

部件型号  AD7541ATQ
说明  CMOS 12-Bit Monolithic Multiplying DAC
下载  8 Pages
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制造商  AD [Analog Devices]
网页  http://www.analog.com
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AD7541A
–5–
REV. B
BIPOLAR OPERATION
(4-QUADRANT MULTIPLICATION)
Figure 5 and Table III illustrate the circuitry and code relation-
ship for bipolar operation. With a dc reference (positive or nega-
tive polarity) the circuit provides offset binary operation. With
an ac reference the circuit provides full 4-quadrant multiplication.
With the DAC loaded to 1000 0000 0000, adjust R1 for
VOUT = 0 V (alternatively, one can omit R1 and R2 and adjust
the ratio of R3 to R4 for VOUT = 0 V). Full-scale trimming can
be accomplished by adjusting the amplitude of VREF or by vary-
ing the value of R5.
As in unipolar operation, A1 must be chosen for low VOS and
low IB. R3, R4 and R5 must be selected for matching and track-
ing. Mismatch of 2R3 to R4 causes both offset and full-scale
error. Mismatch of R5 to R4 or 2R3 causes full-scale error. C1
phase compensation (10 pF to 50 pF) may be required for sta-
bility, depending on amplifier used.
AD7541A
A1
3
R2
*
VDD
16
17
18
1
2
VDD
RFB
VREF
PINS 4–15
GND
OUT1
OUT2
R1
*
VIN
BIT 1 – BIT 12
DIGITAL
GROUND
ANALOG
COMMON
C1
33pF
AD544L
VOUT
AD544J
A2
R4
20k
R5
20k
R3
10k
R6
5k
10%
*FOR VALUES OF R1 AND R2
SEE TABLE 1.
Figure 5. Bipolar Operation (4-Quadrant Multiplication)
Table III. Bipolar Code Table for Offset Binary Circuit of
Figure 5
Binary Number in DAC
MSB
LSB
Analog Output, VOUT
1 1 1 1
1 1 1 1
1 1 1 1
+VIN
2047
2048


1 0 0 0
0 0 0 0
0 0 0 1
+VIN
1
2048


1 0 0 0
0 0 0 0
0 0 0 0
0 Volts
0 1 1 1
1 1 1 1
1 1 1 1
–VIN
1
2048


0 0 0 0
0 0 0 0
0 0 0 0
–VIN
2048
2048


Figure 6 and Table IV show an alternative method of achieving
bipolar output. The circuit operates with sign plus magnitude
code and has the advantage of giving 12-bit resolution in each
quadrant, compared with 11-bit resolution per quadrant for the
circuit of Figure 5. The AD7592 is a fully protected CMOS
changeover switch with data latches. R4 and R5 should match
each other to 0.01% to maintain the accuracy of the D/A con-
verter. Mismatch between R4 and R5 introduces a gain error.
A2
AD7541A
A1
3
R2
*
VDD
16
17
18
1
2
VDD
RFB
VREF
PINS 4–15
GND
OUT1
OUT2
R1
*
VIN
BIT 1 – BIT 12
DIGITAL
GROUND
ANALOG
COMMON
C1
33pF
AD544L
VOUT
AD544J
R5
20k
*FOR VALUES OF R1 AND R2
SEE TABLE 1.
R4
20k
R3
10k
10%
1/2 AD7592JN
SIGN BIT
Figure 6. 12-Bit Plus Sign Magnitude Operation
Table IV. 12-Bit Plus Sign Magnitude Code Table for Circuit
of Figure 6
Sign
Binary Number in DAC
Bit
MSB
LSB
Analog Output, VOUT
0
1 1 1 1
1 1 1 1
1 1 1 1
+VIN
×
4095
4096


0
0 0 0 0
0 0 0 0
0 0 0 0
0 Volts
1
0 0 0 0
0 0 0 0
0 0 0 0
0 Volts
1
1 1 1 1 1 1 1 1
1 1 1 1
–VIN ×
4095
4096


Note: Sign bit of “0” connects R3 to GND.




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