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Application Note 1658
ISL28208SOICEVAL2Z Evaluation Board User’s Guide
Introduction
The ISL28208SOICEVAL2Z evaluation board is designed to
evaluate the performance of the ISL28208 dual Operational
Amplifier. The ISL28208 is a dual low power precision
amplifier that features a common mode input voltage range
extending to 0.5V below the V- rail, a rail-to-rail differential
input voltage range for use as a comparator, and rail-to-rail
output voltage swing, which makes it ideal for single supply
applications where input operation at ground is important.
With a wide operating range from 3V to 40V, in combination
with its precision, low power, and small footprint, ISL28208
provides the user with outstanding value and flexibility relative
to similar competitive parts.
Reference Documents
• ISL28208 Data Sheet,
FN6935
Evaluation Board Key Features
• Single Supply Operation: +9V to +40V
• Dual Supply Operation: ±4.5V to ±20V
• Singled-Ended or Differential Input Operation
• External VREF input
• Banana Jack Connectors for Power Supply and VREF Inputs
• BNC Connectors for Op Amp Input and Output Terminals
• Convenient PCB Pads for Op Amp Input/Output Impedance
Loading
Power Supplies (Figure 1)
External power connections are made through the V+, V-, VREF,
and GND connections on the evaluation board. The circuit can
operate from a single supply or from dual supplies. For single
supply operation, the V- and GND pins are tied together to the
negative or ground reference of the power supply. For split
supplies, V+ and V- terminals connect to their respective
supply terminals. De-coupling capacitors C2 and C4 provide
low-frequency power-supply filtering, while additional
capacitors, C3 and C5, which are connected close to the part,
filter out high frequency noise. Anti-reverse diode D1 (optional)
protects the circuit in the momentary case of accidentally
reversing the power supplies to the evaluation board. The VREF
pin can be connected to ground to establish a ground
referenced input for split supply operation, or can be externally
set to any reference level for single supply operation.
FIGURE 1. POWER SUPPLY CIRCUIT
CLOSE TO DUT
2
0.01µF
0.01µF
2
1
R3
1
1
R16
3
2
1
D1
C2
C4
C3
C5
3
2
1
J1
1
1
J14
1
J12
1
J13
3
2
1
J6
1
J8
0
0
1µF
1µF
VREF
V+
V-
FIGURE 2. PRECISION AMPLIFIER WITH G = -10V/V
INA-
INA+
R13/R23
ISL28208
+4.5V
V-
V+
10k
Ω
10k
Ω
-
+
100k
Ω
V
REF
100k
Ω
V
OUT
GAIN = -10V/V
TO +20V
PRECISION
SENSOR
-4.5V TO -20V
R11/R24
R14/R21
R18/R19
INB-
INB+
6
5
1/7
8
4
2
3
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
Copyright Intersil Americas Inc. 2011. All Rights Reserved.
1-888-INTERSIL or 1-888-468-3774
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Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.
July 26, 2011
AN1658.0
