Overview
The INA133U/2K5 is a high-speed, precision difference amplifier produced by Texas Instruments. It is part of the INA133 and INA2133 series, known for their high slew rate and unity-gain configuration. These amplifiers consist of a precision op-amp with a precision resistor network, which is laser trimmed for accurate gain and high common-mode rejection. The INA133U/2K5 is particularly useful in applications requiring precise differential signal measurement and processing.
The device operates over a wide supply range, from ±2.25V to ±18V for dual supplies and +4.5V to +36V for single supply, and it can handle input common-mode voltages that extend beyond the supply rails. This makes it versatile for various industrial and automotive applications.
Key Specifications
| Parameter | Conditions | Min | Max | Units | |
|---|---|---|---|---|---|
| Offset Voltage | VCM = 0V | ±150 | ±450 | ±900 | µV |
| Current Limit, Continuous-to-Common | –25/+32 | 6 | mA | ||
| Capacitive Load (stable operation) | 1000 | 6 | pF | ||
| Small-Signal Bandwidth –3dB | 1.5 | 6 | MHz | ||
| Slew Rate | 5 | 6 | V/µs | ||
| Settling Time: 0.1% (10V Step, CL = 100pF) | 4 | 6 | µs | ||
| Overload Recovery Time (50% Overdrive) | 4 | 6 | µs | ||
| Operating Voltage Range (Dual Supplies) | ±2.25 | ±18 | V | ||
| Operating Voltage Range (Single Supply) | +4.5 | +36 | V | ||
| Quiescent Current (per amplifier) | IO = 0 | ±0.95 | ±1.2 | mA | |
| Specification Temperature Range | –40 | +85 | °C | ||
| Operation Temperature Range | –55 | +125 | °C |
Key Features
- High Slew Rate and Bandwidth: The INA133U/2K5 features a high slew rate of 5 V/µs and a small-signal bandwidth of 1.5 MHz, making it suitable for high-speed applications.
- Precision and Accuracy: The device has a low offset voltage and drift, with laser-trimmed resistors for accurate gain and high common-mode rejection ratio (CMRR) of up to 90 dB.
- Wide Supply Range: It operates over a wide supply range from ±2.25V to ±18V for dual supplies and +4.5V to +36V for single supply.
- Extended Input Common-Mode Range: The input common-mode voltage range extends beyond the supply rails, allowing for differential signals above and below the supply rails.
- Low Quiescent Current: The device has a low quiescent current of ±0.95 mA to ±1.2 mA per amplifier, which is energy-efficient.
- Industrial Temperature Range: It is specified for operation over an extended industrial temperature range of –40°C to +85°C and can operate from –55°C to +125°C.
Applications
- Industrial Automation: Used in data acquisition systems, process control, and industrial measurement applications where precise differential signal processing is required.
- Automotive Systems: Suitable for automotive applications due to its robust performance over a wide temperature range and ability to handle high common-mode voltages.
- Medical Devices: Can be used in medical devices for precise signal amplification and processing, such as in ECG and EEG systems.
- Test and Measurement Equipment: Ideal for use in test and measurement equipment where high accuracy and stability are crucial.
- Power Supply and Voltage-to-Current Conversion: Used in precision voltage-to-current conversion circuits and high output current applications.
Q & A
- What is the primary function of the INA133U/2K5?
The INA133U/2K5 is a high-speed, precision difference amplifier designed to accurately measure and process differential signals.
- What is the operating voltage range of the INA133U/2K5?
The device operates over a wide supply range from ±2.25V to ±18V for dual supplies and +4.5V to +36V for single supply.
- What is the slew rate of the INA133U/2K5?
The slew rate of the INA133U/2K5 is 5 V/µs.
- What is the common-mode rejection ratio (CMRR) of the INA133U/2K5?
The CMRR of the INA133U/2K5 is up to 90 dB.
- What is the quiescent current of the INA133U/2K5?
The quiescent current is ±0.95 mA to ±1.2 mA per amplifier.
- What is the temperature range for the INA133U/2K5?
The device is specified for operation over an extended industrial temperature range of –40°C to +85°C and can operate from –55°C to +125°C.
- Can the INA133U/2K5 handle input common-mode voltages beyond the supply rails?
- What are some common applications of the INA133U/2K5?
The INA133U/2K5 is used in industrial automation, automotive systems, medical devices, test and measurement equipment, and power supply and voltage-to-current conversion applications.
- How is the offset voltage adjusted in the INA133U/2K5?
The offset voltage can be adjusted using an optional circuit as shown in Figure 2 of the datasheet, where a voltage applied to the Ref terminal can be used to null the offset voltage.
- Is the INA133U/2K5 suitable for high-speed applications?
