Intersil ISL281X7MSOPEVAL1Z Manuel utilisateur

Application Note 1565

ISL281X7MSOPEVAL1Z Evaluation Board User’s Guide

Introduction

The ISL281X7MSOPEVAL1Z evaluation board is a design

platform containing all the circuitry needed to

characterize critical performance parameters of the

ISL281X7 operational amplifiers in MSOP-8 package,

using a variety of user defined test circuits.

The ISL281X7 operational amplifiers feature low bias

current, low noise, and low offset and temperature drift.

Reference Documents

• ISL28107 Data Sheet, FN6631

• ISL28117 Data Sheet, FN6632

• ISL28127 Data Sheet, FN6633

Evaluation Board Key Features

The ISL281X7MSOPEVAL1Z is designed to enable the IC

to operate from a single supply, +4.5VDC to +40VDC or

from split supplies, ±2.25VDC to ±20V. The board is

configured for a single op amp connected for differential

input with a closed loop gain of 10. A single external

reference voltage (VREF) pin and provisions for a

user-selectable voltage divider-filter are included.

Power Supplies (Figure 1)

External power connections are made through the +V, -V,

VREF and Ground connections on the evaluation board.

For single supply operation, the -V and Ground pins are

tied together to the power supply negative terminal. For

split supplies, +V and -V terminals connect to their

respective power supply terminals. De-coupling

capacitors C2 and C4 connect close to their respective

supplies, while two additional capacitors, C1 and C5, are

connected close to the part to filter out high frequency

noise. Anti-reverse diodes D1 and D2 protect the circuit

in the case of accidental polarity reversal.

Amplifier Configuration (Figure 2)

The schematic of 1/2 of the op amp with the components

supplied is shown in Figure 2. The circuit implements a

differential input amp with a closed loop gain of 10. The

circuit can operate from a single supply or from dual

supplies. The VREF pin must be connected to ground to

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.

4.7µF

DNP

D2D1

R16

J11

J10

J13

S1AB

4.7µF

S1AB

DNP

VREFV+V-

FIGURE 1. POWER SUPPLY CIRCUIT

IN-

IN+

VREF

IN -

IN +

GND

100k

RREF+

VOUT

ISL281X7

V-

VCM

IN-

IN+

VREF

V+

RIN-

10k

RIN+

10k

100k

DNP

FIGURE 2. BASIC AMPLIFIER CONFIGURATION

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

1-888-INTERSIL or 1-888-468-3774 |Intersil (and design) is a registered trademark of Intersil Americas Inc.

All other trademarks mentioned are the property of their respective owners.

May 25, 2010

AN1565.0

2AN1565.0

May 25, 2010

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 filtering and 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 FIGURE 4. OUTPUT STAGE

IN- OUTNODEIN+

R14

R15

R10R8

R11R9

DNP DNP

DNP

OPEN

DNP

10k 100k

100k

10k

VREF

To Output

To IN+

To IN-

R13

R12

R18

J12

R17

DNP

OPEN

TABLE 1. ISL281X7MSOPEVAL1Z COMPONENTS PARTS LIST

DEVICE # DESCRIPTION COMMENTS

C2, C4 CAP, SMD, 0805, 4.7µF, 50V, 10%, X7R, ROHS Power Supply Decoupling

C1, C5 CAP, SMD, 0603, 0.01µF, 50V, 10%, X7R, ROHS Power Supply Decoupling

C3, C6 CAP, SMD, 0603, DNP-PLACE HOLDER, ROHS User selectable capacitors - not populated

D1, D2 DIODE-RECTIFIER, 40V, 0.5A, ROHS Reverse Power Protection

U1 (ISL28107FUZ) OP AMP, MSOP, ROHS

U1 (ISL28117FUZ) OP AMP, MSOP, ROHS

U1 (ISL28127FUZ) OP AMP, MSOP, ROHS

R1-R4, R6-R8, R10, R13,

R14, R16, R17, R19, R20

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

R9, R12 RES, SMD, 0603, 10k, 1/10W, 1%, TF, ROHS Gain resistors

R11, R15 RES, SMD, 0603, 100k, 1/10W, 1%, TF, ROHS Gain resistors

Application Note 1565Application Note 1565

Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without notice. Accordingly, the

reader is cautioned to verify that the Application Note or Technical Brief is current before proceeding.

For information regarding Intersil Corporation and its products, see www.intersil.com

AN1565.0

May 25, 2010

Application Note 1565

FIGURE 5. ISL281X7MSOPEVAL1Z TOP VIEW

4AN1565.0

May 25, 2010

IN +

IN+

OUTPUT

IN-

OUT

NODE

IN -

R14

OPEN

DNP 100K

0.01UF

4.7UF

DNP

S1AB

DNP

10K

100K

DNP DNP

DNP

10K

R11

R13

R15

R12

R17

J13

J10

J11

J12

C4C2

R16

R18

R19

R20

0.01UF

DNP

R10

S1AB

4.7UF

MSOP8

Pack.

Generic

V-

V+

VREF

FIGURE 6. ISL281X7MSOPEVAL1Z SCHEMATIC DIAGRAM

Application Note 1565

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