ISO122P Precision Isolation Amplifier DIP-8 (ISO122P IC)
The ISO122P is a precision analog isolation amplifier that uses a unique duty cycle modulation-demodulation technique to transmit signals across a 2pF differential capacitive barrier. This digital modulation ensures that the barrier's characteristics do not degrade signal integrity, providing high reliability and excellent transient immunity. Housed in a through-hole 8-pin DIP package (often listed in datasheets as 16-pin, but common "P" variants for standard breadboarding are 8-pin), it is designed to eliminate ground loops and protect sensitive circuitry from high-voltage transients.
This IC is a critical component in industrial process control for thermocouple or RTD isolation and 4mA to 20mA current loop systems. In India, it is frequently used in high-end medical instrumentation, motor control systems, and power monitoring equipment where galvanically isolating the input and output stages is required for safety and noise reduction.
Key Features
- Galvanic Isolation: Rated for 1500Vrms continuous isolation voltage.
- High Noise Immunity: Features a Common Mode Rejection (IMR) of 140dB at 60Hz.
- Fixed Unity Gain: Easy to use in circuits with no external components required for basic operation.
- Bipolar Operation: Supports output voltage ranges of +/-10V.
- Precision Performance: Extremely low nonlinearity of 0.020% maximum.
- Wide Supply Range: Operates on dual supplies from +/-4.5V to +/-18V.
- 50kHz Bandwidth: Suitable for accurate sensing of relatively high-frequency signals.
Specifications
- IC Type: Isolation Amplifier
- Isolation Voltage: 1500 Vrms
- Small Signal Bandwidth: 50 kHz
- Nonlinearity: 0.02% FSR (Full Scale Range)
- Supply Voltage (VS1/VS2): +/-4.5V to +/-18V
- Slew Rate: 2 V/us
- Input Voltage Range: +/-10V
- Package Type: PDIP-8
- Operating Temperature: -25 to +85 degrees Celsius
Interfaces (Standard 8-Pin DIP)
- Pin 1 (+VS1): Positive Input-Side Supply
- Pin 2 (-VS1): Negative Input-Side Supply
- Pin 3 (VIN): Analog Input Signal
- Pin 4 (GND 1): Input-Side Ground
- Pin 5 (GND 2): Output-Side Ground
- Pin 6 (VOUT): Analog Output Signal
- Pin 7 (-VS2): Negative Output-Side Supply
- Pin 8 (+VS2): Positive Output-Side Supply
