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AN1420.0

August 28, 2008

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.

FIGURE 3. INPUT STAGE (1/2)

FIGURE 4. OUTPUT STAGE (1/2)

IN-

OUT

NODE

IN+

C1

R5

R4

J2

J1

R1

R6

R17

R2

R14

R3

R18

R15

R12

R10

R13

R11

DNP

DNP

DNP

DNP

DNP

DNP

DNP

OPEN

DNP

DN

P

10k

100k

100k

10k

0

VREF

TO OUTPUT

TO IN+

TO IN-

R26

C6

C8

R2

8

10

k

O

PEN

OPEN

0

FROM OUTPUT

Application Note 1420

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