ISL28258SOICEVAL1Z Datasheet ISL28248MSOPEVAL1Z, ISL28258SOICEVAL1Z, ISL28248SOICEVAL1Z | P1-P3

AN1419.0

ISL282X8MSOPEVAL1Z ISL282X8SOICEVAL1Z

Evaluation Board User’s Guide

Introduction

The ISL282X8MSOPEVAL1Z and ISL282X8SOICEVAL1Z

evaluation board are design platforms containing all the

circuitry needed to characterize critical performance

parameters of the ISL282X8 operational amplifiers in both

MSOP-8 and SOIC-8 packages, using a variety of user

defined test circuits.

The ISL28238 and ISL28248 high-speed operational

amplifiers feature low power consumption, while ISL28258

and ISL28268 operational amplifiers feature ultra-low power

consumption. All op amps have rail-to-rail output drive

capability and are designed to operate with a single lithium

cell or two Ni_Cd batteries.

Reference Documents

• ISL28238 Data Sheet, FN6336

• ISL28248 Data Sheet, FN6337

• ISL28258 Data Sheet, FN6377

• ISL28268 Data Sheet, FN6378

Evaluation Board Key Features

The ISL282xEVAL1Z is designed to enable the IC to operate

from a single supply, +2.4VDC to +5.5VDC or from split

supplies, ±1.2VDC to ±2.75V. The board is configured for a

dual 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

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

VREF and Ground connections on the evaluation board.

User-selectable SMA edge connectors are also provided for

+V and -V. 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 to their respective supplies through R16

and R31 0Ω resistors. These resistors are 0Ω but can be

changed by the user to provide additional power supply

filtering, or to reduce the voltage rate-of-rise to less than

±1V/µS. Two additional capacitors, C3 and C5 are

connected close to the part to filter out high frequency noise.

Anti-reverse diode D1 protects the circuit in the case of

accidental polarity reversal (see Figure 1).

Amplifier Configuration

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

J11

R31

R16

C2 C4

J14

J12

J13

0.01µF0.01µF

4.7µF4.7µF

VREF

V+V-

FIGURE 1. POWER SUPPYLY CIRCUIT

100kΩ

IN-

IN+

VREF

IN -

IN +

GND

REF+

VOUT

ISL282X8 (1/2)

V-

0Ω

VCM

IN-

IN+

VREF

V+

RIN-

10kΩ

RIN+

10kΩ

100kΩ

10kΩ

FIGURE 2. BASIC AMPLIFIER CONFIGURATION

Application Note August 28, 2008

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

1-888-INTERSIL or 1-888-468-3774

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

AN1419.0

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

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

(see 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 10kΩ 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

FIGURE 4. OUTPUT STAGE

IN- OUTNODEIN+

J18

J20

J19

J17

R17

R14

R18R15

R12R10

R13R11

DNP DNP

DNP

OPEN

DNP

10k

100k

10k

VREF

TO OUTPUT

TO IN+

TO IN-

R26

R28

10k

OPEN

FROM

OUTPUT

TABLE 1. ISL282X8EVAL1Z COMPONENTS PARTS LIST

DEVICE # DESCRIPTION COMMENTS

C2, C4 CAP-TANTALUM, SMD, D, 4.7µF, 50V, 10% LOW ESR, ROHS Power Supply Decoupling

C3, C5 CAP, SMD, 0603,1µF, 25V,10%, X7R, ROHS Power Supply Decoupling

C1, C6 to C10 CAP, SMD, 0603, DNP-Place Holder, ROHS User-Selectable Capacitors - Not Populated

D1 Diode-Schottky Barrier, SMD, SOT-23, 3P, 40V, ROHS Reverse Power Protection

U1 (ISL28238FUZ) IC-5 MHz RRIO OP AMP, 8P, MSOP, ROHS

U1 (ISL28238FBZ) IC-5 MHz RRIO OP AMP, 8P, SOIC, ROHS

U1 (ISL28248FUZ) IC-5 MHz RRIO OP AMP, 8P, MSOP, ROHS

U1 (ISL28248FBZ) IC-5 MHz RRIO OP AMP, 8P, SOIC, ROHS

U1 (ISL28258FUZ) IC-39µA RRIO OP AMP, 8P, MSOP, ROHS

U1 (ISL28258FBZ) IC-39µA RRIO OP AMP, 8P, SOIC, ROHS

U1 (ISL28268FUZ) IC-39µA RRIO OP AMP, 8P, MSOP, ROHS

U1 (ISL28268FBZ) IC-39µA RRIO OP AMP, 8P, SOIC, ROHS

R30, R32, R34 to R36 RES, SMD, 0603, 0.1%, MF, DNP-PLACE HOLDER User-Selectable Resistors - Not Populated

R4, R16, R25 to R27, R31 RES, SMD, 0603, 0Ω, 1/10W, TF, ROHS 0Ω User-Selectable Resistors

R11, R14, R21, R24, R28, R29 RES, SMD, 0603, 10k, 1/10W, 1%, TF, ROHS Gain and Other User-Selectable Resistors

R13, R18, R19, R23 RES, SMD, 0603, 100k, 1/10W, 1%, TF, ROHS Gain Resistors

Application Note 1419

AN1419.0

August 28, 2008

Application Note 1419

ISL282X8EVAL1Z Top View (SOIC Shown)

P1-P3 P4-P4

ISL28258SOICEVAL1Z

Mfr. #:

Buy ISL28258SOICEVAL1Z

Manufacturer:

Renesas / Intersil

Description:

Amplifier IC Development Tools ISL28258 EVAL BRD 1 ROHS CMPL SOI

Lifecycle:

New from this manufacturer.

Delivery:

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ISL28258SOICEVAL1Z

ISL28258SOICEVAL1Z

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