Overview
The IVC102U/2K5 from Texas Instruments is a precision switched integrator transimpedance amplifier designed for high-accuracy current measurements and integration applications. This component is particularly suited for applications requiring the amplification of low-level sensor currents, such as those from photodiodes and ionization chambers. The IVC102U/2K5 integrates low-level input current over a user-determined period, storing the resulting voltage on an integrating capacitor, which can be held for accurate measurement. This device offers a lower noise alternative to conventional transimpedance op-amp circuits and is ideal for precision low current measurements, photodiode measurements, and ionization chamber measurements.
Key Specifications
| Parameter | Conditions | Min | Max | Units | |
|---|---|---|---|---|---|
| Transfer Function | VO = –(IIN)(TINT)/CINT | ||||
| Gain Error | CINT = C1 + C2 + C3 | ±5 | ±17 % vs Temperature | % | |
| Nonlinearity | VO = ±10V | ±0.005 | % | ||
| Input Current Range | ±100 | µA | |||
| Offset Voltage | IIN = 0, CIN = 50pF | -5 | ±20 | mV | |
| Input Bias Current | S1, S2 Open | -100 | ±750 | fA | |
| Noise Voltage | f = 1kHz | 10 nV/√Hz | nV/√Hz | ||
| Integration Capacitors | C1 + C2 + C3 | 80 | 100 | 120 | pF |
| Output Voltage Range (Positive) | RL = 2kΩ | (V+)-3 | (V+)-1.3 | V | |
| Output Voltage Range (Negative) | RL = 2kΩ | (V-)+3 | (V-)+2.6 | V | |
| Op Amp Gain-Bandwidth | 2 | MHz | |||
| Op Amp Slew Rate | 3 | V/µs | |||
| Reset Slew Rate | 3 | V/µs | |||
| Settling Time (0.01% 10V Step) | 6 | µs | |||
| Power Supply Voltage Range (Positive) | +4.75 | +15 | +18 | V | |
| Power Supply Voltage Range (Negative) | -10 | -15 | -18 | V | |
| Operating Temperature Range | -40 | 85 | °C |
Key Features
- On-Chip Integrating Capacitors: The device includes integrating capacitors C1, C2, and C3, which can be connected in parallel to achieve a total capacitance of 100 pF.
- Low Input Bias Current: Maximum input bias current of 750 fA, ensuring minimal current leakage.
- Low Noise: Designed to minimize noise, making it suitable for precise measurements.
- Low Switch Charge Injection: Reduces the impact of switch charge injection, maintaining signal integrity.
- Fast Pulse Integration: Capable of integrating fast pulses, making it ideal for applications requiring rapid signal processing.
- Low Nonlinearity: Typical nonlinearity of 0.005%, ensuring high accuracy in measurements.
- TTL/CMOS-Compatible Timing Inputs: Allows for precise control over integration, hold, and reset functions using TTL/CMOS-compatible logic signals.
- Package Options: Available in 14-Pin plastic DIP and SO-14 surface-mount packages, both specified for the –40°C to 85°C industrial temperature range.
Applications
- Precision Low Current Measurement: Ideal for measuring very small currents with high accuracy.
- Photodiode Measurements: Suitable for amplifying low-level currents from photodiodes.
- Ionization Chamber Measurements: Used for precise measurements in ionization chambers.
- Current/Charge-Output Sensors: Applicable in sensors that output current or charge.
- Leakage Current Measurement: Can be used to measure very small leakage currents.
- LIDAR and Laser Distance Measurement Systems: Designed for light detection and ranging (LIDAR) and laser distance measurement systems.
Q & A
- What is the primary function of the IVC102U/2K5?
The IVC102U/2K5 is a precision switched integrator transimpedance amplifier designed to integrate low-level input current over a user-determined period and store the resulting voltage on an integrating capacitor. - What are the typical applications of the IVC102U/2K5?
The device is typically used in precision low current measurements, photodiode measurements, ionization chamber measurements, current/charge-output sensors, and leakage current measurements. - What is the input bias current of the IVC102U/2K5?
The maximum input bias current is 750 fA. - What is the nonlinearity of the IVC102U/2K5?
The typical nonlinearity is 0.005%. - What are the package options for the IVC102U/2K5?
The device is available in 14-Pin plastic DIP and SO-14 surface-mount packages. - What is the operating temperature range of the IVC102U/2K5?
The operating temperature range is –40°C to 85°C. - How is the integration period controlled in the IVC102U/2K5?
The integration period is controlled by TTL/CMOS-compatible timing inputs. - What is the gain error of the IVC102U/2K5?
The gain error is ±5 to ±17% vs temperature. - What is the output voltage range of the IVC102U/2K5?
The output voltage range is (V+)-3 to (V+)-1.3 V for positive and (V-)+3 to (V-)+2.6 V for negative outputs. - How does the IVC102U/2K5 handle noise?
The device is designed to minimize noise, with a noise voltage of 10 nV/√Hz at 1 kHz.
