Overview
The INA157U from Texas Instruments is a high-performance, precision difference amplifier designed for a wide range of general-purpose applications. It features a high slew rate and is configured as a G = 1/2 or G = 2 amplifier, utilizing a precision op-amp with an integrated resistor network. This device operates on dual supplies ranging from ±4V to ±18V and is specified for operation over the extended industrial temperature range of –40°C to +85°C. The INA157U is available in an 8-pin SOIC package, making it suitable for various industrial and instrumentation applications.
Key Specifications
| Parameter | Conditions | Min | Typ | Max | Units |
|---|---|---|---|---|---|
| Offset Voltage | Initial | ±100 | ±500 | ±1000 | µV |
| Offset Voltage vs Temperature | ±2 | ±20 | µV/°C | ||
| Quiescent Current | IO = 0mA | ±2.4 | ±2.9 | mA | |
| Temperature Range | Specified | –40 | +85 | °C | |
| Thermal Resistance, ΘJA | SO-8 Surface-Mount | 150 | °C/W | ||
| Supply Voltage, V+ to V– | 40V | V | |||
| Input Voltage Range | ±80V | V | |||
| Operating Temperature | –55 | +125 | °C | ||
| Storage Temperature | –55 | +125 | °C | ||
| Junction Temperature | +150 | °C | |||
| Lead Temperature (soldering, 10s) | +300 | °C |
Key Features
- High Slew Rate: The INA157U features a high slew rate, making it suitable for applications requiring fast signal processing.
- Precision Resistor Network: The device includes an integrated precision resistor network, eliminating the need for external precision resistors.
- Dual Supply Operation: Operates on dual supplies ranging from ±4V to ±18V, providing flexibility in various application environments.
- Low Offset Voltage and Drift: Laser-trimmed for low offset voltage and drift, ensuring high accuracy in measurements.
- High Common-Mode Rejection Ratio (CMRR): Offers a minimum CMRR of 86dB, ensuring effective rejection of common-mode signals.
- Compact SOIC Package: Available in an 8-pin SOIC package, suitable for surface-mount applications.
- Wide Temperature Range: Specified for operation over the extended industrial temperature range of –40°C to +85°C.
Applications
- Differential Input Amplifier: Suitable for amplifying differential input signals while rejecting common-mode signals.
- Instrumentation Amplifier: Used in instrumentation applications requiring high input impedance and high CMRR.
- Building Block for Various Circuits: Can be configured as G = 1/2 or G = 2 amplifiers and used in circuits such as differential current receivers, voltage-controlled current sources, and ground loop eliminators.
- Current Shunt Monitor: Effective in monitoring current through shunts in various industrial and automotive applications.
Q & A
- What is the typical dual supply voltage for the INA157U?
The typical dual supply voltage for the INA157U is ±15V.
- What is the maximum input offset voltage of the INA157U?
The maximum input offset voltage of the INA157U is ±0.5mV.
- What is the minimum operating temperature for the INA157U?
The minimum operating temperature for the INA157U is –40°C.
- What is the package type and pin count of the INA157U?
The INA157U is available in an 8-pin SOIC package.
- What is the common-mode rejection ratio (CMRR) of the INA157U?
The minimum CMRR of the INA157U is 86dB.
- How does the INA157U handle input voltage range?
The INA157U can accurately measure differential signals that are above the positive or negative power supply rail, with a linear common-mode range extending from 3•(V+) – 7.5V to 3•(V–) +7.5V.
- What are the thermal characteristics of the INA157U?
The thermal resistance (ΘJA) of the INA157U in an SO-8 surface-mount package is 150°C/W, and it has a junction temperature of +150°C.
- How can the offset voltage be adjusted in the INA157U?
The offset voltage can be adjusted using an optional circuit as shown in Figure 3 of the datasheet, allowing for trimming the output offset voltage.
- What are some common applications of the INA157U?
The INA157U is used in applications such as differential input amplifiers, instrumentation amplifiers, current shunt monitors, and ground loop eliminators.
- What precautions should be taken when handling the INA157U?
The INA157U is sensitive to electrostatic discharge (ESD), and appropriate precautions should be taken when handling the device to prevent damage.
