Overview
The ISO122U/1K, produced by Texas Instruments, is a precision analog isolation amplifier designed to provide high isolation and low cost. This device uses a novel duty cycle modulation-demodulation technique to transmit the input signal across a high-voltage differential capacitive barrier. The ISO122U/1K is easy to use, requiring no external components for operation, and is suitable for a wide range of applications including industrial process control, ground loop elimination, and power monitoring.
Key Specifications
| Parameter | Unit | Min | Typ | Max |
|---|---|---|---|---|
| Supply Voltage | V | ±4.5 | ±15 | ±18 |
| Continuous Isolation Voltage | Vrms | 1500 | ||
| Junction Temperature | °C | 150 | ||
| Storage Temperature | °C | –40 | 125 | |
| Nonlinearity | %FSR | 0.020% | ||
| Signal Bandwidth | kHz | 50 | ||
| Gain Error | %FSR | ±0.05 | ±0.50 | |
| Gain vs Temperature | ppm/°C | ±10 | ||
| Quiescent Current (VS1) | mA | ±5 | ±7 | |
| Quiescent Current (VS2) | mA | ±5.5 | ±7 | |
| Isolation Mode Rejection (60Hz) | dB | 140 |
Key Features
- High Isolation Voltage: Rated for 1500 Vrms continuous isolation voltage.
- Low Nonlinearity: Maximum nonlinearity of 0.020%.
- Wide Supply Range: Operates with supply voltages from ±4.5 V to ±18 V.
- High Signal Bandwidth: Supports a signal bandwidth of up to 50 kHz.
- Low Quiescent Current: Quiescent currents of 5 mA on VS1 and ±5.5 mA on VS2.
- High Isolation Mode Rejection: 140 dB at 60 Hz.
- No External Components Required: Easy to use with no external components needed for operation.
Applications
- Industrial Process Control: Suitable for transducer isolation, thermocouples, RTDs, pressure bridges, and flow meters.
- Ground Loop Elimination: Effective in eliminating ground loops.
- Motor and SCR Control: Used in motor and SCR control devices.
- Power Monitoring: Ideal for power monitoring applications.
- PC-Based Data Acquisition: Used in PC-based data acquisition systems.
- Test Equipment: Utilized in various test equipment.
Q & A
- What is the continuous isolation voltage of the ISO122U/1K?
The continuous isolation voltage is 1500 Vrms. - What is the maximum nonlinearity of the ISO122U/1K?
The maximum nonlinearity is 0.020%. - What is the signal bandwidth of the ISO122U/1K?
The signal bandwidth is up to 50 kHz. - What is the quiescent current of the ISO122U/1K on VS1 and VS2?
The quiescent currents are 5 mA on VS1 and ±5.5 mA on VS2. - What is the isolation mode rejection at 60 Hz for the ISO122U/1K?
The isolation mode rejection at 60 Hz is 140 dB. - Does the ISO122U/1K require any external components for operation?
No, the ISO122U/1K does not require any external components for operation. - What are the typical applications of the ISO122U/1K?
Typical applications include industrial process control, ground loop elimination, motor and SCR control, power monitoring, PC-based data acquisition, and test equipment. - What is the operating temperature range of the ISO122U/1K?
The operating temperature range is –25°C to 85°C. - What is the storage temperature range of the ISO122U/1K?
The storage temperature range is –40°C to 125°C. - How is the input signal transmitted across the isolation barrier in the ISO122U/1K?
The input signal is transmitted digitally across the isolation barrier using a duty cycle modulation-demodulation technique.
