Intersil ISL282x6EVAL1Z User manual

AN1420.0

ISL282x6EVAL1Z Evaluation Board User’s Guide

Introduction

The ISL282x6EVAL1Z evaluation board is a design platform

containing all the circuitry needed to characterize critical

performance parameters of the ISL282x6 operational

amplifiers in both MSOP-8 and SOIC-8 packages, using a

variety of user defined test circuits.

The ISL28236 and ISL28246 high-speed operational

amplifiers feature low power consumption, while ISL28256

and ISL28266 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

• ISL28236 Data Sheet

• ISL28246 Data Sheet

• ISL28256 Data Sheet

• ISL28266 Data Sheet

Evaluation Board Key Features

The ISL282x6EVAL1Z 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 (Figure 1)

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

C2and C4connect to their respective supplies through R16

and R31 0Ωresistors. These resistors are 0Ωbut 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, C3and C5are connected

close to the part to filter out high frequency noise.

Anti-reverse diode D1protects 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

J11

R31

R16

C2 C4

J14

J12 J13

0.01µF0.01µF

4.7µF4.7µF

VREF

V+V-

FIGURE 1. POWER SUPPLY CIRCUIT

IN-

IN+

VREF

IN -

IN +

GND

100k

REF

VOUT

ISL282x6 (1/2)

V-

VCM

IN-

IN+

VREF

V+

10k

100k

10k

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

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

2AN1420.0

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 (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 (see Figure 4) have a 10kΩload 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 (1/2) FIGURE 4. OUTPUT STAGE (1/2)

IN- OUTNODEIN+

J1 R1

R17

R2 R14

R18R15

R12R10

R13R11

DNP DNP

DNP

OPEN

DNP

10k 100k

100k

10k

VREF

TO OUTPUT

TO IN+

TO IN-

R26

R28

10k

OPEN

FROM OUTPUT

Application Note 1420

3AN1420.0

August 28, 2008

ISL282x6EVAL1Z 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, 0.1µF, 25V, 10%, X7R, ROHS Power supply decoupling

C1, C6 thru 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 (ISL28236FUZ) IC-5 MHz RRIO OP AMP, 8P, MSOP, ROHS

U1 (ISL28236FBZ) IC-5 MHz RRIO OP AMP, 8P, SOIC, ROHS

U1 (ISL28246FUZ) IC-5 MHz RRIO OP AMP, 8P, MSOP, ROHS

U1 (ISL28246FBZ) IC-5 MHz RRIO OP AMP, 8P, SOIC, ROHS

U1 (ISL28256FUZ) IC-39µA RRIO OP AMP, 8P, MSOP, ROHS

U1 (ISL28256FBZ) IC-39µA RRIO OP AMP, 8P, SOIC, ROHS

U1 (ISL28266FUZ) IC-39µA RRIO OP AMP, 8P, MSOP, ROHS

U1 (ISL28266FBZ) IC-39µA RRIO OP AMP, 8P, SOIC, ROHS

R30, R32, R34 thru R36 RESISTOR, SMD, 0603, 0.1%, MF, DNP-PLACE HOLDER User selectable resistors - not

populated

R4, R16, R25 thru 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 1420

4AN1420.0

August 28, 2008

Application Note 1420

FIGURE 5. ISL282x6EVAL1Z TOP VIEW (SOIC SHOWN)

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

AN1420.0

August 28, 2008

Application Note 1420

ISL282x6EVAL1Z Schematic Diagram

NODEBIN-A IN+BOUTANODEA IN-BOUTBIN+A

J11

R31

R16

R36

R32 R34

R35

R30

R20

C10

R4 R24

C2 C4

J15

J16

J14

J12

J13

R26

R27

C8C9

R29

R25

R23

R17

R28

R13R11

1U1

0.01µF0.01µF

4.7µF4.7µF

SOIC8

DNP

10k

OPEN

10k

OPEN

DNP

OPEN

DNP

OPEN

DNP

10k 10K100K 100k

100k 100k

10K 10k

0 DNP

VREF

V+V-

MSOP8

R15 R18 R19 R22

R21

R14

R10 R12

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