ISL28470EVAL1Z Intersil, ISL28470EVAL1Z Datasheet

ISL28470EVAL1Z

Manufacturer Part Number

ISL28470EVAL1Z

Description

EVALUATION PLATFORM ISL28470

Manufacturer

Intersil

Datasheets

1.ISL28470EVAL1Z.pdf (18 pages)

2.ISL28470EVAL1Z.pdf (4 pages)

Specifications of ISL28470EVAL1Z

Channels Per Ic

4 - Quad

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)

260µA

Voltage - Supply, Single/dual (±)

2.4 V ~ 5.5 V, ±1.2 V ~ 2.75 V

Board Type

Fully Populated

Utilized Ic / Part

ISL28470

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

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Introduction

The ISL28470EVAL1Z evaluation board is a design platform

containing all the circuitry needed to characterize critical

performance parameters of the ISL28470 Quad

Instrumentation Amplifier using a variety of user defined test

circuits.

The ISL28470 is a quad channel instrumentation amplifier

optimized for 2.4V to 5V single supplies. The device features

an Input Range Enhancement Circuit (IREC) which

maintains CMRR performance for input voltages equal to the

positive supply and down to 50mV above the negative

supply rail. The input signal is capable of swinging above the

positive supply rail and to the negative supply with only a

slight degradation of the CMRR performance. The output

operation is rail to rail. The ISL28270 is compensated for a

minimum gain of 100.

Reference Documents

• ISL28470 Data Sheet, FN6260

Evaluation Board Key Features

The ISL28470EVAL1Z 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 4

independent instrumentation amplifiers connected for a

closed loop gain of 101 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-

Power Supplies

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

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, C

ground through R

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.

100kΩ

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

February 12, 2007

ISL28470EVAL1Z Evaluation

V+

-V

ENABLE

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

V+

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

FIGURE 1. POWER SUPPLY CIRCUIT

4.7µF

0.1µF

1/4 ISL28470

and R

Board User’s Guide

0Ω

(Refer to Figure 1)

, 0Ω resistors. Resistors R

GND

10kΩ

and D

and C

0.1µF

4.7µF

protect the

VOUT(x)

, connect to

AN1289.0

V-

and

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ISL28470EVAL1Z Summary of contents

Page 1

... Reference Documents • ISL28470 Data Sheet, FN6260 Evaluation Board Key Features The ISL28470EVAL1Z 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 4 independent instrumentation amplifiers connected for a closed loop gain of 101 with inverting and non-inverting high impedance terminated with 100k resistors to ground. Each amplifier contains it’ ...

Page 2

... VREF input coaxial connection to the ISL28470 FB+ pin can be made at the FB+ BNC connector. The differential inputs have additional resistor placements for adding input attenuation establish input DC offsets through the VREF pin. ISL28470EVAL1Z Components Parts List DEVICE # ...

Page 3

... ISL28470EVAL1Z Top View 3 Application Note 1289 AN1289.0 February 12, 2007 ...

Page 4

... ISL28470EVAL1Z Schematic Diagram VREFD VREFC VREFB R12 R11 R10 DNP DNP DNP DNP DNP DNP VREFD VREFC J8 R13 R15 FB+A DNP DNP R17 VREFA J9 R18 1K -INA 0 J10 R21 +INA 0 J11 R24 R26 FB+B DNP DNP R28 VREFB J12 R29 1K -INB 0 J13 R32 ...

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