ISL28270INEVAL1Z Intersil, ISL28270INEVAL1Z Datasheet

ISL28270INEVAL1Z

Manufacturer Part Number

ISL28270INEVAL1Z

Description

EVALUATION BOARD FOR ISL28270

Manufacturer

Intersil

Datasheets

1.ISL28470EVAL1Z.pdf (18 pages)

2.ISL28270INEVAL1Z.pdf (4 pages)

Specifications of ISL28270INEVAL1Z

Channels Per Ic

2 - Dual

Amplifier Type

Instrumentation

Output Type

Single-Ended, Rail-to-Rail

Slew Rate

0.5 V/µs

-3db Bandwidth

240kHz

Current - Output / Channel

29mA

Operating Temperature

-40°C ~ 125°C

Current - Supply (main Ic)

120µA

Voltage - Supply, Single/dual (±)

2.4 V ~ 5.5 V, ±1.2 V ~ 2.75 V

Board Type

Fully Populated

Utilized Ic / Part

ISL28270

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

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Introduction

The ISL2827xINEVAL1Z evaluation board is a design

platform containing all the circuitry needed to characterize

critical performance parameters of the ISL28270, ISL28271,

ISL28272 or ISL28273 Dual Instrumentation Amplifiers using

a variety of user defined test circuits.

The ISL2827x series of amplifiers are dual channel

instrumentation amplifiers optimized for 2.4V to 5V single

supplies. These devices feature an Input Range

Enhancement Circuit (IREC) which enables the inputs to

swing to the rails. The ISL28270 and ISL28273 maintain

CMRR performance from the positive rail down to within

50mV of the negative rail. The ISL28271 and ISL28272 can

swing 100mV beyond the rails. The output operation of all

devices is rail-to-rail. The ISL28270 and ISL28272 are

compensated for a minimum gain of 100 and the ISL28271

and ISL28273 are compensated for a minimum gain of 10.

Reference Documents

• ISL28270, ISL28273 Data Sheet, FN6260

• ISL28271, ISL28272 Data Sheet, FN6390

Evaluation Board Key Features

The ISL2827xINEVAL1Z is designed to be operated from a

single supply (+2.4VDC to +5VDC), or from split supplies

(±1.2VDC to ±2/5V). The board is configured for 2

independent instrumentation amplifiers connected for a

closed loop gain of 101 (ISL28270, ISL28272) or a gain of

10 (ISL28271, ISL28273) with inverting and non-inverting

high impedance terminated with 100k resistors to ground.

Each amplifier contains it’s own VREF input to establish an

input common mode reference. An ENABLE select switch is

provided for each amplifier to be used to save power by

powering the device down.

VCM

IN+

IN-

VREF

VREF(x)

IN+(x)

IN-(x)

GND

Application Note

100kΩ

FIGURE 2. BASIC AMPLIFIER CONFIGURATION

100kΩ

1kΩ

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

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

FB+

FB-

IN+

IN-

ISL2827xINEVAL1Z Evaluation Board

100kΩ (ISL28270, ISL28272)

9.09kΩ (ISL28271, ISL28273)

Power Supplies (Refer to Figure 1)

External power connections are made through the VSP (+V),

VSM (-V) and GND connections on the evaluation board.

For single supply operation, the VSM (-V) and GND pins are

tied together to the power supply negative terminal. For split

supplies, VSP (+V) and VSM (-V) terminals connect to their

respective power supply terminals. Resistors R

are 0Ω but can be changed by the user to provide power

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

than ±1V/µs. Anti-reverse diodes D

circuit in the case of accidental polarity reversal.

Amplifier Configuration (Refer to Figure 2)

The schematic of each of the two op amps with the

components supplied is shown in Figure 2. The circuit

implements a differential input instrumentation amp with a

closed loop gain of 101 for the ISL28270 and ISL28272, and

10 for the ISL28271, ISL28273. The circuit can operate from

a single 2.4VDC to +5VDC supply, or from dual supplies

from ±1.2VDC to ±2.5VDC.The output common mode

reference is applied to the VREF pin, and has a range from

ground (VM) to VP.

-V

0.1µF

ENABLE

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

June 15, 2009

VSM

Intersil (and design) is a registered trademark of Intersil Americas Inc.

FIGURE 1. POWER SUPPLY CIRCUIT

1/2 ISL28270, ISL28271, ISL28272, ISL28273

0Ω

GND

10kΩ

User’s Guide

and D

10µF

VOUT(x)

VSP

protect the

AN1290.2

0.1µF

and R

Related parts for ISL28270INEVAL1Z

ISL28270INEVAL1Z Summary of contents

Page 1

... GND VSP 0.1µ 10µF VP FIGURE 1. POWER SUPPLY CIRCUIT and R 32 and D protect the 1 2 1/2 ISL28270, ISL28271, ISL28272, ISL28273 0Ω VOUT(x) 10kΩ Intersil (and design registered trademark of Intersil Americas Inc. Copyright Intersil Americas Inc. 2007, 2009. All Rights Reserved ...

Page 2

User-selectable Options (Refer to Figure 3) Component pads are included to enable a variety of user selectable circuits to be added to the amplifier differential inputs, the VREF input, and the amplifier feedback loop. A voltage divider and filter option ...

Page 3

... ISL2827xINEVAL1Z Top View 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 ...

Page 4

ISL2827xINEVAL1Z Schematic Diagram VM R3 FB+A 1 DNP 5 2 RIN-A -INA RIN+A +INA ENA ENABLE 10K DISABLE ENABLE R2 2 ...

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