Overview
The ISO124U/1KG4 from Texas Instruments is a precision isolation amplifier designed to provide high accuracy and reliability in various industrial and control applications. This device incorporates a novel duty cycle modulation-demodulation technique to ensure robust and accurate signal transmission across an isolation barrier. The ISO124U/1KG4 is available in a SO-28 package and operates within a temperature range of –25°C to +85°C, making it suitable for a wide range of environments.
Key Specifications
| Parameter | Min | Typ | Max | Units |
|---|---|---|---|---|
| Isolation Rated Voltage (continuous ac, 60Hz) | 1500 | Vac | ||
| Isolation Mode Rejection (60Hz) | 140 | dB | ||
| Barrier Impedance | 10^14 || 2 Ω || pF | |||
| Leakage Current at 60Hz (VISO = 240Vrms) | 0.18 | 0.5 | µArms | |
| Nominal Gain | 1 | V/V | ||
| Gain Error | ±0.05 | ±0.50 | %FSR | |
| Nonlinearity | ±0.005 | ±0.010 | %FSR | |
| Input Voltage Range | ±10 | ±12.5 | V | |
| Output Voltage Range | ±10 | ±12.5 | V | |
| Supply Voltage Range | ±4.5 | ±18 | V | |
| Quiescent Current (VS1, VS2) | ±5.0, ±5.5 | ±7.0, ±7.0 | mA | |
| Operating Temperature Range | –25 | +85 | °C |
Key Features
- High Isolation Voltage: Rated for 1500Vrms continuous ac isolation and tested for 2400Vrms partial discharge.
- Low Nonlinearity: Maximum nonlinearity of ±0.010% FSR, ensuring high accuracy in signal transmission.
- Wide Supply Range: Operates with supply voltages from ±4.5V to ±18V.
- High Input and Output Voltage Range: Input and output voltage ranges of ±10V to ±12.5V.
- Fixed Unity Gain Configuration: Simplifies application design with a fixed gain of 1.
- High Frequency Response: Small-signal bandwidth of 50 kHz and slew rate of 2 V/µs.
- Low Ripple Voltage: Output ripple voltage of 20 mVp-p at 500 kHz, which can be filtered out using a simple low-pass filter.
Applications
- Industrial Process Control: Suitable for isolating transducers, thermocouples, RTDs, pressure bridges, and flow meters.
- Ground Loop Elimination: Effective in eliminating ground loops in various industrial setups.
- Motor and SCR Control: Used in motor control and SCR (Silicon-Controlled Rectifier) applications.
- Power Monitoring: Ideal for monitoring high-voltage power systems.
- PC-Based Data Acquisition: Used in data acquisition systems requiring high isolation and accuracy.
- Test Equipment: Employed in various test and measurement equipment.
Q & A
- What is the isolation voltage rating of the ISO124U/1KG4?
The ISO124U/1KG4 is rated for 1500Vrms continuous ac isolation and tested for 2400Vrms partial discharge.
- What is the nonlinearity of the ISO124U/1KG4?
The maximum nonlinearity is ±0.010% FSR.
- What is the supply voltage range for the ISO124U/1KG4?
The device operates with supply voltages from ±4.5V to ±18V.
- What is the input and output voltage range of the ISO124U/1KG4?
The input and output voltage ranges are ±10V to ±12.5V).
- What is the typical gain of the ISO124U/1KG4?
The typical gain is 1 V/V in a fixed unity gain configuration).
- How does the ISO124U/1KG4 handle high-frequency signals?
The device has a small-signal bandwidth of 50 kHz and a slew rate of 2 V/µs).
- What is the ripple voltage at the output of the ISO124U/1KG4?
The output ripple voltage is 20 mVp-p at 500 kHz, which can be filtered out using a simple low-pass filter).
- In what package types is the ISO124U/1KG4 available?
The ISO124U/1KG4 is available in a SO-28 package).
- What are some common applications of the ISO124U/1KG4?
Common applications include industrial process control, ground loop elimination, motor and SCR control, power monitoring, PC-based data acquisition, and test equipment).
- How should the power-supply pins of the ISO124U/1KG4 be bypassed?
Each power-supply pin should be bypassed with 1µF tantalum capacitors located as close to the amplifier as possible).
