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AD712JN Fiches technique(PDF) 10 Page - Analog Devices

No de pièce AD712JN
Description  Dual Precision, Low Cost, High Speed, BiFET Op Amp
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Fabricant  AD [Analog Devices]
Site Internet  http://www.analog.com
Logo AD - Analog Devices

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AD712
REV. B
–10–
D/A CONVERTER APPLICATIONS
The AD712 is an excellent output amplifier for CMOS DACs.
It can be used to perform both 2 quadrant and 4 quadrant op-
eration. The output impedance of a DAC using an inverted
R-2R ladder approaches R for codes containing many 1s, 3R for
codes containing a single 1, and for codes containing all zero,
the output impedance is infinite.
For example, the output resistance of the AD7545 will modu-
late between 11 k
Ω and 33 kΩ. Therefore, with the DAC’s
internal feedback resistance of 11 k
Ω, the noise gain will vary
from 2 to 4/3. This changing noise gain modulates the effect of
the input offset voltage of the amplifier, resulting in nonlinear
DAC amplifier performance.
The AD712K with guaranteed 700
µV offset voltage minimizes
this effect to achieve 12-bit performance.
Figures 31 and 32 show the AD712 and AD7545 (12-bit
CMOS DAC) configured for unipolar binary (2-quadrant multi-
plication) or bipolar (4-quadrant multiplication) operation.
Capacitor C1 provides phase compensation to reduce overshoot
and ringing.
+15V
1/2
AD712
GAIN
ADJUST
VIN
VREF
VDD
RFB
OUT1
AGND
AD7545
DGND
R2*
*FOR VALUES OF
R1 AND R2 SEE TABLE I
DATA INPUT
ANALOG
COMMON
C1
33pF
0.1 F
VDD
R1*
1/2
AD712
VOUT
0.1 F
–15V
R3
10k
1%
R5
20k
1%
R4
20k
1%
12
DB11–DB0
Figure 32. Bipolar Operation
+15V
1/2
AD712
GAIN
ADJUST
VIN
VREF
VDD
RFB
OUT1
AGND
AD7545
DGND
VOUTA
R2A*
*REFER TO
TABLE I
DB11–DB0
ANALOG
COMMON
C1A
33pF
0.1 F
VDD
R1A*
1/2
AD712
GAIN
ADJUST
VIN
VREF
VDD
RFB
OUT1
AGND
AD7545
DGND
VOUTB
R2B*
*REFER TO
TABLE I
DB11–DB0
ANALOG
COMMON
C1B
33pF
0.1 F
–15V
R1B*
VDD
Figure 31. Unipolar Binary Operation
R1 and R2 calibrate the zero offset and gain error of the DAC.
Specific values for these resistors depend upon the grade of
AD7545 and are shown below.
Table I. Recommended Trim Resistor Values vs. Grades
of the AD7545 for VDD = +5 V
Trim
Resistor
JN/AQ/SD
KN/BQ/TD
LN/UD
GLN/GUD
R1
500
200
100
20
R2
150
68
33
6.8


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