ISL28210SOICEVAL1Z Datasheet, PDF (1/4 Pages) Intersil Corporation – ISL28210SOICEVAL1Z Evaluation Board User’s Guide

Application Note 1594
ISL28210SOICEVAL1Z Evaluation Board User’s Guide
Introduction
The ISL28210SOICEVAL1Z evaluation board is designed
to evaluate the performance of the ISL28210 Precision
Low Noise JFET Operational Amplifier. The ISL28210 is a
dual JFET amplifier that features low noise, high slew
rate, low input bias current and low offset voltage. With a
wide operating range from 9V to 40V, in combination with
its high precision, low noise and high speed operation,
the ISL28210 is ideal for precision medical and
instrumentation, sensor conditioning, power supply
control and photodiode amplifiers.
Reference Documents
• ISL28210 Data Sheet, FN6639
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.
V-
3
2
V+
3
2
VREF
C2
1µF
C4
1µF
D1
CLOSE TO DUT
C3
C5
0.01µF 0.01µF
FIGURE 1. POWER SUPPLY CIRCUIT
PRECISION
SENSOR
R11/R24
10kΩ
R14/R21
10kΩ
R13/R23
INA- 2
INB- 6
INA+ 3
INB+ 5
100kΩ
8
-
V+
ISL28210
V-
+
+4.5V
TO +20V
1/7
V_OUT
R18/R19
100kΩ
4
GAIN = -10V/V
-4.5V TO -20V
V_REF
FIGURE 2. PRECISION AMPLIFIER WITH G = -10V/V
October 1, 2010
AN1594.0
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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