ISL28233MSOPEVAL2Z Datasheet, PDF (1/4 Pages) Intersil Corporation – ISL28233MSOPEVAL2Z Evaluation Board User’s Guide

Application Note 1569
ISL28233MSOPEVAL2Z Evaluation Board User’s Guide
Introduction
The ISL28233MSOPEVAL2Z Evaluation Board is designed to
evaluate the performance of the ISL28233 Chopper
Stabilized op amp. The evaluation board contains the
circuitry needed to evaluate the high performance of the
ISL28233 amplifier. The ISL28233 chopper stabilized
rail-to-rail dual op amp features a low 8µV maximum V_OS
over-temperature and a 0.1Hz 1/f noise corner frequency
enabling very high gain single-stage DC amplifiers that can
operate from single cell batteries while consuming only
20µA of current. The ISL28233MSOPEVAL2Z evaluation
board can be configured as a precision high-gain
(G = 10,000V/V) differential amplifier and demonstrates
the level of performance possible with this type of amplifier
while operating from battery voltages as low as 1.65V.
Reference Documents
• ISL28233 Data Sheet, FN7692
Evaluation Board Key Features
• Single Supply Operation: +1.65V to +5.5V
• Dual Supply Operation: ±0.825V to ±2.75V
• Singled-Ended or Differential Input Operation with
High Gain (G = 10,000V/V)
• 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 2)
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.
IN-
IN+
VCM
IN -
IN +
VREF
VREF _GND
R11/R24
100Ω
R14/R21
100Ω
R13/R23
INA- 2
INB- _{6 -}
1MΩ
INA+ ³
INB+ 5
ISL28233
+
R18/R19
100kΩ
V+ 8
V- 4
1/7
0Ω
R26/R27
R28/R29 OPEN
OUT
OPEN
FIGURE 1. BASIC DIFFERENTIAL AMPLIFIER CONFIGURATION
October 5, 2010
AN1569.1
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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