2

AN1509.0

November 6, 2009

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 (Figure 4) 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

R4

J2

J1

R1

R2

R14

R18

R15

R12

R10

R13

R11

DNP

DNP

DNP

DNP

OPEN

DNP

10k

100k

100k

10k

0

VREF

To Output

To IN+

To IN-

R26

C6

OPEN

0

From Output

TABLE 1. ISL282X7SOICEVAL2Z COMPONENTS PARTS LIST

DEVICE #

DESCRIPTION

COMMENTS

C2, C4

CAP, SMD, 0805, 1µF, 50V, 10%, X7R, ROHS

Power Supply Decoupling

C3, C5

CAP, SMD, 0603, 0.01µF, 50V, 10%, X7R, ROHS

Power Supply Decoupling

C1, C6-C10

CAP, SMD, 0603, DNP-PLACE HOLDER, ROHS

User selectable capacitors - not populated

D1

DIODE-RECTIFIER, SMD, SOD-123, 2P, 40V, 0.5A, ROHS Reverse Power Protection

U1 (ISL28207FBZ)

OP AMP, SOIC, ROHS

U1 (ISL28217FBZ)

OP AMP, SOIC, ROHS

U1 (ISL28227FBZ)

OP AMP, SOIC, ROHS

R1-R3, R5-R8, R10, R12,

R15, R17, R20,R22,

R28-R30, R32, R34-R36

RESISTOR, SMD, 0603, 0.1%, MF, DNP-PLACE HOLDER

User selectable resistors - not populated

R5, R18

RES, SMD, 0603, 0Ω, 1/10W,TF, ROHS

Zero ohm user selectable resistors

R11, R14, R21, R24

RES, SMD, 0603, 10k, 1/10W, 1%, TF, ROHS

Gain resistors

R13, R18, R19, R23

RES, SMD, 0603, 100k, 1/10W, 1%, TF, ROHS

Gain resistors

Application Note 1509