Intersil ISL2827xINEVAL1Z Manual de usuario

AN1290.2

ISL2827xINEVAL1Z Evaluation Board

User’s Guide

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.

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 R32 and R33

are 0Ωbut 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 D1and D2 protect the

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.

R33

VSM

0.1µF

10µF

2D1

0.1µF

R32 00

GND VSP

NC C

FIGURE 1. POWER SUPPLY CIRCUIT

IN+

IN-

FB+

FB-

VREF(x)

IN+(x)

IN-(x)

GND 100kΩ(ISL28270, ISL28272)

1kΩ

100kΩ

100kΩVOUT(x)

1/2 ISL28270, ISL28271, ISL28272, ISL28273

-V

ENABLE

10kΩ

0Ω

VCM

IN+

IN-

VREF 9.09kΩ(ISL28271, ISL28273)

FIGURE 2. BASIC AMPLIFIER CONFIGURATION

Application Note June 15, 2009

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.

2AN1290.2

June 15, 2009

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 can be added to establish a

power supply tracking common mode reference at the VREF

input, or a coaxial connection to the amplifier FB+ pin can be

made at the FB+ BNC connector. The differential inputs have

additional resistor placements for adding input attenuation,

or to establish input DC offsets through the VREF pin.

FIGURE 3. COMPONENT-SELECTABLE OPTIONS

R6R5

C3OPEN

DNPDNP VREFA

V+V-

VREFA

R13 R15

R17

R18

R21

R22 R23

R20

R19

R16

R14

J10

FB+A

-INA

+INA 0

DNP DNP DNP

DNP

100k

VREFA

ISL2827xINEVAL1Z Components Parts List

DEVICE # DESCRIPTION COMMENTS

C3, C5CAP, SMD, 0805, 0.1µF, 25V, 10%, X7R, ROHS Power Supply Decoupling

CFA, CFB, CLA, CLB CAP, SMD, 0805, DNP-PLACE HOLDER, ROHS Optional Amplifier Feedback Caps

Not Populated

C1, C2CAP, SMD, 1206, 1µF, 25V, 10%, X7R, ROHS Power Supply Decoupling

C4CAP-TANTALUM, SMD, D, 10µF, 35V, 10%, LOW ESR,

ROHS Optional VREF Filter

Not Populated

D1, D2DIODE-RECTIFIER, SMD, MELF, 2 Ld, 50V, 1A, GPP,

ROHS Reverse Power Protection

U1ISL28270FAZ or ISL28271FAZ or ISL28272FAZ or

ISL28273FAZ INSTRUMENTATION AMP,16P, QSOP,

ROHS

R32, R33, RIN+A, RIN+B, RIN-A, RIN-B, RSA, RSB RES, SMD, 0805, 0Ω, 1/8W, TF, ROHS 0ΩUser Selectable Resistors

RIA, RIB. RES, SMD, 0805, 1k, 1/8W, 1%,TF, ROHS RIGain Resistors

R1, R2RES, SMD, 0805, 10k, 1/8W, 1%,TF, ROHS ENABLE Pull-up Resistors

R15 to R18 RES, SMD, 0805, 100k, 1/10W, 1%, TF, ROHS

R9, R12, R20, R22, R27, R29 CAP, SMD, 0805, DNP-PLACE HOLDER, ROHS User Selectable Resistors

Not Populated

RFA, RFB (ISL28271, ISL28273) RES, SMD, 0805, 9.09k, 1/8W, 1%, TF, ROHS RFGain Resistors - ISL28271,

ISL28272

RFA, RFB (ISL28270, ISL28272) RES, SMD, 0805, 100k, 1/8W, 1%, TF, ROHS RFGain Resistors - ISL28270

R3, R6, R10, R11, R13, R14, R19, R21, R23, R25,

R28, R30, RLA, RLB, RX.RES, SMD, 0805, DNP-PLACE HOLDER, ROHS User Selectable Resistors

Not Populated

S1, S2SWITCH-SEALED MINI TOGGLE, TH, 3P, SP,

ON/NONE/ON, GOLD Enable/Disable Select Switches

Application Note 1290

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

AN1290.2

June 15, 2009

ISL2827xINEVAL1Z Top View

Application Note 1290Application Note 1290

4AN1290.2

June 15, 2009

ISL2827xINEVAL1Z Schematic Diagram

DISABLE

ENABLE

DISABLE

CLOSE TO PART

DNP

100K

OPEN

0.1UF

10UF

10K

DNP

100K

100

ROBERT POSPISIL

OPEN

DNP DNP

MMBZ52XXB

0.1UF

10K

QSOP16

07/25/06

ALAN ERZINGER

VM VP

DNP

100K

4.7K4.7K

DNP

VPVM

DNP

100K 100K

DNP

100

DNP

4.7K

1UF

ISL2827XINEVAL1Z

OPEN

DNP

-INA

VSM

GND

VSP

RIN-A

RLA

R15

RSA

RSB

CLA

VOUTA

VOUTB

R11

VREFA

R32

R33

RIN+A

+INA

R16

R10

ENB

ENA

RLB

CLB

R27

R20

FB+A

R19

R25

RFA

RFB

RIA

R21

R28

VREFB

R29

R22

R30

R23

RIB

R12

RIN-B

FB+B

-INB

R17

R18

R14

R13

RIN+B

+INB

CFA

CFB

SHEET

HRDWR ID

UPDATED BY:

DATE:

TESTER

FILENAME:

MASK#

DATE:

ENGINEER:

TITLE:

RELEASED BY:

DRAWN BY:

Generic

Pack.

Application Note 1290

Mouser Electronics

Authorized Distributor

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ISL28271INEVAL1Z

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