ISL28213/14SOICEVAL2Z Evaluation Board User’s
Guide
Introduction
The ISL28213/14SOICEVAL2Z evaluation board is a
design platform containing all the circuitry needed to
characterize critical performance parameters of the
ISL28213 and ISL28214 operational amplifiers, using a
variety of user defined test circuits.
The ISL28213 and ISL28214 CMOS operational
amplifiers feature low power consumption, low input bias
current, and rail-to-rail input and output drive capability.
They are designed to operate with a single lithium cell or
two Ni_Cd batteries.
Reference Documents
• ISL28213/14SOICEVAL2Z Evaluation Board User’s
• ISL28213 Data Sheet,
• ISL28214 Data Sheet,
Evaluation Board Key Features
The ISL28213/14SOICEVAL2Z 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.
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
January 19, 2010
AN1519.0
Guide
VCM
IN-
IN+
VREF
VREF
FN6728
FN6800
GND
1
IN +
IN -
FIGURE 2. BASIC AMPLIFIER CONFIGURATION
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0Ω
10k
10k
RIN-
RIN+
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
RREF+
100k
10k
IN+
IN-
Application Note 1519
+
-
respective power supply terminals. De-coupling
capacitors C2 and C4 connect to their respective supplies
through R16 and R31 0Ω resistors. These resistors are
0Ω, but can be changed by the user to provide additional
power supply filtering. Two additional capacitors, C3 and
C5, are connected close to the DUT to filter out high
frequency noise. Anti-reverse diode D1 protects 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
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.
100k
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RF
|
Intersil (and design) is a registered trademark of Intersil Americas Inc.
0.01µF
V+
VP
V-
VM
CLOSE
FIGURE 1. POWER SUPPLY CIRCUIT
C3
V-
1µF
C2
Copyright Intersil Americas Inc. 2010. All Rights Reserved
TO DUT
0.01µF
C5
ISL28213, ISL28214 (1/2)
D1
0Ω
1µF
C4
V+
10k
RL
VREF
VOUT