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Application Note 1420
establish a ground referenced input for dual supply
operation, or can be externally set to any reference level for
single supply operation. VREF should not be left floating.
User-selectable Options ( Figures 3 and 4)
Component pads are included to enable a variety of
user-selectable circuits to be added to the amplifier VREF,
inputs, outputs, and the amplifier feedback loops. The inputs
(Figure 3) have additional resistor and capacitor, and jumper
placements for loading and/or measurement of frequency
sensitive parameters.
The outputs (see Figure 4) have a 10k Ω load resistor to
ground and have additional resistor and capacitor
placements for loading.
Note: Operational amplifiers are sensitive to output
capacitance and may oscillate. In the event of oscillation,
reduce output capacitance by using shorter cables or add a
resistor in series with the output.
IN-
IN+
NODE
R10
DNP
OUT
R12
DNP
FROM OUTPUT
C6
J1
J2
R1
DNP
R2
R4
0
R11
10k
10k
R13
100k
C1
OPEN
R14
VREF
TO OUTPUT
TO IN-
TO IN+
OPEN
R26
0
DNP
R15
DNP
R18
100k
FIGURE 3. INPUT STAGE (1/2)
2
FIGURE 4. OUTPUT STAGE (1/2)
AN1420.0
August 28, 2008
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