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Isolation amplifiers (iso-amps) are used to electrically isolate input and output signals using inductive couplings to protect components from potentially dangerous voltages or to amplify low-level analog signals in applications with multiple channels. Usually, these isolation barriers are used to safeguard sensitive sensors from damages due to high voltages.
For e.g. an electrocardiograph (ECG) or an electroencephalograph (EEG), which use electricity to get physical data from patients.
Isolation amplifiers are used with systems where the system supplying data is separated from a sensor or input. To minimize large-signal non-linearity or distortion, isolation amplifiers use a linear optocoupler (LOC). The linear optocoupler is used to increase the linearity of the isolation amplifier over a particular signal range. Linear optocouplers (LOC) comprises of two photodiodes connected to input light emitting diode (LED). The operation one of the photodiode is to feed the input circuitry while the other photodiode is to feed the output circuitry.
Specifications
Specifications of isolation amplifiers include rejection ratio, bandwidth, nonlinearity, accuracy, high CMR & high isolation, etc.
Specifications of isolation amplifiers A202 are as follows:
Ports: 2
Supply Voltage:+15V
Supply Current: 5mA
Input V Range: ±5V
Rejection Ratio (dB): 105dB
Bandwidth (Unity Gain): 5kHz
Output Range: ±5V
Nonlinearity: 0.025%
Temp Range:0 to +70
High CMR: 130 dB (Gain = 100 V/V)
High CMV Isolation: ±2000 V pk
Industry served
Isolation amplifiers are used for various industrial applications, including telecommunications, instrumentation and medical systems.
Application
Isolation amplifiers are widely used in signal conditioning applications. Other applications of isolation amplifier are as follows:
- Multichannel Data Acquisition
- Current Shunt Measurements
- Motor Controls
- Process Signal Isolation
- High Voltage Instrumentation Amplifier
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