Overview
The INA155UA is a single-supply, rail-to-rail output, CMOS instrumentation amplifier produced by Texas Instruments. It is designed for low-voltage, single-supply operation and is optimized for applications requiring low offset voltage, high bandwidth, and high slew rate. The INA155UA is suitable for a wide range of applications, including medical devices, industrial automation, and automotive systems, where precision and reliability are crucial.
Key Specifications
| Parameter | Condition | Min | Typ | Max | Units |
|---|---|---|---|---|---|
| Input Offset Voltage (VOS) | VS = +5.0V, VCM = VS/2 | ±0.2 | ±1 | ±8 | mV |
| Offset Voltage Drift (dVOS/dT) | ±5 | µV/°C | |||
| Power Supply Rejection Ratio (PSRR) | VS = +2.7V to +6V, VCM = 0.2 • VS | ±50 | ±200 | µV/V | |
| Bandwidth (G = 10) | 550kHz | ||||
| Slew Rate | 6.5V/µs | ||||
| Operating Temperature Range | –55°C | +125°C | |||
| Supply Voltage Range | +2.7V | +5.5V | |||
| Input Bias Current | 0.2pA | ||||
| Package Type | SO-8, MSOP-8 |
Key Features
- Rail-to-rail output swing within 10mV of the supply rails.
- Low offset voltage: ±200µV.
- Low offset drift: ±5µV/°C.
- Internal fixed gain options: 10V/V or 50V/V.
- Wide bandwidth: 550kHz (G = 10).
- High slew rate: 6.5V/µs.
- Low input bias current: 0.2pA.
- Low cost and compact packaging: SO-8 and MSOP-8.
- ESD protection: Input signals can tolerate momentary voltages up to 500mV beyond the supply rails.
Applications
The INA155UA is versatile and can be used in various applications, including:
- Medical devices: For precise signal amplification in medical equipment.
- Industrial automation: For monitoring and controlling industrial processes.
- Automotive systems: For sensor signal conditioning and data acquisition.
- Single-supply, high-side current monitoring: As shown in the typical application circuit, it can monitor current in high-side configurations.
- Driving capacitive loads: Suitable for directly driving capacitive digital-to-analog converter (CDAC) inputs.
Q & A
- What is the operating temperature range of the INA155UA?
The INA155UA operates over a temperature range of –55°C to +125°C.
- What are the available gain settings for the INA155UA?
The gain can be set to 10V/V or 50V/V by configuring the gain pins. Custom gains between 10 and 50 can also be achieved using external resistors.
- What is the input offset voltage of the INA155UA?
The input offset voltage is typically ±1mV, with a maximum of ±8mV.
- How does the INA155UA protect against input overvoltage?
The device inputs are protected by ESD diodes that conduct if the input voltages exceed the power supplies by more than 500mV. Input resistors can be used to limit the current to 10mA.
- What is the bandwidth of the INA155UA when configured for a gain of 10?
The bandwidth is 550kHz when the gain is set to 10.
- Can the INA155UA drive capacitive loads?
Yes, the INA155UA is suitable for directly driving capacitive digital-to-analog converter (CDAC) inputs.
- What are the package options for the INA155UA?
The INA155UA is available in SO-8 and MSOP-8 packages.
- How is the gain error affected by using external resistors?
Using external resistors to set custom gains can increase the gain error and gain error drift with temperature.
- What is the slew rate of the INA155UA?
The slew rate is 6.5V/µs.
- How is the input bias current handled in the INA155UA?
A path must be provided for the input bias current, which is less than 10pA. This can be achieved through various input circuit configurations.
