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ISL55141, ISL55142, ISL55143
Evaluation Board User鈥檚 Manual
Application Note
September 27, 2006
AN1270.0
Before Getting Started
This document supplements the ISL55141, ISL55142,
ISL55143 specification
FN6230.
Evaluation board users
should review that document to obtain information on the
part鈥檚 basic functionality and power requirements. A most
important note is
before powering up the board, review
the Power-up Sequence in that specification.
There are
many DC sources utilized, therefore a user may
inadvertently mis-apply the power sources causing damage
to the part.
Take time to review the ISL55141, ISL55142, ISL55143 Data
Sheet (FN6230) and become familiar with the part鈥檚 basic
functions and power options. Note also that FN6230 super
cedes this document with respect to updates and
modifications. Always refer to that document if discrepancies
occur.
No voltage should be greater than VCC or less than VEE.
Also, VOH must be greater than VOL. Since there are so
many variations of use, each evaluation board provides
three jumpers relating to basic power strapping.
All ISL55141, ISL55142, ISL55143 boards are designed
essentially in the same fashion. This document provides the
user with the information regarding the evaluation board
design, circuitry layout and jumper options.
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VEE
QA
QB
VOL
VOH
PD
CVB
VINP
CVA
VCC
VEE
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8
ISL55141_TSSOP
FIGURE 1. THERE ARE NO GROUND PINS ON THESE
COMPARATORS. VEE ALWAYS PROVIDES THE
MOST NEGATIVE POWER CONNECTION.
JP01
VOL = VEE
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2
VOL
VEE
VCC
C4
C3
+4.7碌F 0.1碌F
VEE
TP04_VCC_VEE
DIF--
DIF+
JP02
JP03
VOL = GND VEE = GND
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2
1
GND
GND
VOL
2
GND - Banana Jack VCC - Banana Jack VEE - Banana Jack
VOH
TP03-VOH_VOL
VOL - Banana Jack
DIF+
C1
C2
+4.7碌F 0.1碌F
DIF--
VOL
Jumper Options - VEE, VOL and GND
First, VEE can be negative with respect to ground for
receiving negative input ranges on the VINPs (comparator
Inputs). The comparator outputs QA, QB toggle between
VOH and VOL. VOL could also be a negative voltage,
although this is usually not the case. VOL should never be
more negative than VEE.
For single supply operations, the user may wish to connect
VEE to ground and VOL as well. Therefore, on each
evaluation board there are positions for three jumpers (JP01,
JP02, JP03).
The user should make note that the ISL55141, ISL55142,
ISL55143 all operate with VEE as the negative reference.
There are no actual ground connection to the comparators
unless VEE itself is connected to ground.
VOH - Banana Jack
FIGURE 2. THREE JUMPERS ARE AVAILABLE TO SET USER
POWER STRAPPING OPTIONS.
Before beginning the evaluation, the user should determine
the desired relationship between GND, VEE and VOL.
JP01 Connects VOL to VEE
Both VEE and VOL voltage busses are negative with respect
to ground. Comparator receives negative inputs and
translates the QA/QB outputs with a negative low voltage.
JP02 Connects VOL to GND
VOL low is connected to ground, VEE is negative with
respect to ground. Comparator inputs operate below ground
but QA/QB level translation in reference to ground.
JP03 Connects VEE to GND
Both VOL and VEE are referenced to ground. There are no
negative voltage requirements with respect to Comparator
Inputs or level translation on the QA/QB Outputs
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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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Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright Intersil Americas Inc. 2006. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
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