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AD8553 Datasheet(PDF) 23 Page - Analog Devices

Part No. AD8553
Description  Wide Supply Range, Micropower,
Download  28 Pages
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Maker  AD [Analog Devices]
Homepage  http://www.analog.com
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AD8553 Datasheet(HTML) 23 Page - Analog Devices

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Data Sheet
AD8420
Rev. 0 | Page 23 of 28
OUTPUT BUFFERING
The AD8420 is designed to drive loads of 20 kΩ or greater but
can deliver up to 10 mA to heavier loads at lower output voltage
swings (see Figure 42). If more output current is required, buffer
the AD8420 output with a precision op amp. Figure 67 shows
the recommended configuration using the ADA4692-2 as a single
supply. This low power op amp can swing its output from 1 V to
4 V on a single 5 V supply while sourcing or sinking more than
30 mA of current. When using this configuration, the load seen
by the AD8420 is approximately R1 + R2.
R1
R2
+5V
–VS
+VS
–VS
+VS
0.1µF
VOUT
0.1µF
ADA4692-2
VIN
AD8420
VREF
Figure 67. Output Buffering
Because the ADA4692-2 is a dual op amp, another op amp is
now free for use as an active filter stage or to buffer another
AD8420 output on the same PCB. Figure 68 shows another
suggestion for how to use this second op amp. In this circuit,
the voltage from the wiper of a potentiometer is buffered by the
ADA4692-2, allowing a variable level shift of the output. Resistors
above and below the potentiometer reduce the total range of the
level shift but increase the precision. If the potentiometer were
connected directly to the REF pin of the AD8420, gain error would
be introduced from the variable resistance. The potentiometer can
be tuned in hardware or software, depending on the type of
potentiometer chosen. For a list of digital potentiometers made
by Analog Devices, Inc., visit www.analog.com/digipots/.
R1
R2
+5V
0.1µF
VOUT
0.1µF
ADA4692-2
VIN
AD8420
REF
R
R
CW
W
CCW
SUGGESTION FOR SECOND
AMPLIFIER: VARIABLE
LEVEL SHIFT WITHOUT
AFFECTING GAIN
Figure 68. Variable Level Shift


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