Overview
The INA118PB, produced by Texas Instruments, is a precision, low-power instrumentation amplifier designed for a wide range of applications requiring high accuracy and low power consumption. This device features a versatile three op-amp design and is known for its excellent performance in terms of offset voltage, drift, and common-mode rejection. The INA118PB operates with power supplies as low as ±2.25 V and has a quiescent current of only 350 µA, making it an excellent choice for battery-operated systems. It is available in 8-pin plastic DIP and SO-8 surface-mount packages and is specified for the –40°C to +85°C temperature range.
Key Specifications
| Parameter | Test Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Offset Voltage, RTI | TA = 25°C | ±10 | ±50/G | ±50/G | µV |
| Offset Voltage Drift | TA = –40°C to +85°C | ±0.2 | ±2/G | ±0.5/G | µV/°C |
| Input Bias Current | TA = 25°C | ±1 | ±5 | ±10 | nA |
| Common-Mode Rejection Ratio (CMRR) | G = 1000 | 110 | dB | ||
| Gain Range | 1 | 10000 | V/V | ||
| Gain Error | G = 1 | ±0.01% | ±0.024% | % | |
| Supply Voltage Range | ±2.25 | ±18 | V | ||
| Quiescent Current | VIN = 0 V | ±350 | ±385 | µA | |
| Operating Temperature Range | –40 | +85 | °C |
Key Features
- Low offset voltage: 50 µV maximum
- Low drift: 0.5 µV/°C maximum
- Low input bias current: 5 nA maximum
- High common-mode rejection ratio (CMRR): 110 dB minimum at G = 1000
- Inputs protected to ±40 V
- Wide supply range: ±2.25 to ±18 V
- Low quiescent current: 350 µA
- Available in 8-pin plastic DIP and SO-8 surface-mount packages
- Single external resistor sets any gain from 1 to 10000
- Current-feedback input circuitry provides wide bandwidth, even at high gain (70 kHz at G = 100)
Applications
- Pressure transmitter
- Temperature transmitter
- Weigh scale
- Electrocardiogram (ECG)
- Analog input module
- Data acquisition (DAQ)
- Bridge amplifiers
- Thermocouple amplifiers
- RTD sensor amplifiers
- Medical instrumentation
Q & A
- What is the typical offset voltage of the INA118PB?
The typical offset voltage of the INA118PB is 50 µV maximum.
- What is the common-mode rejection ratio (CMRR) of the INA118PB?
The CMRR of the INA118PB is 110 dB minimum at G = 1000.
- What is the quiescent current of the INA118PB?
The quiescent current of the INA118PB is 350 µA.
- What is the gain range of the INA118PB?
The gain range of the INA118PB is from 1 to 10000, set by a single external resistor.
- What are the package options for the INA118PB?
The INA118PB is available in 8-pin plastic DIP and SO-8 surface-mount packages.
- What is the operating temperature range of the INA118PB?
The operating temperature range of the INA118PB is –40°C to +85°C.
- How is the gain of the INA118PB set?
The gain of the INA118PB is set by a single external resistor (RG) using the equation: G = 1 + (50 kΩ / RG).
- What is the input protection of the INA118PB?
The inputs of the INA118PB are protected to ±40 V without damage.
- What are some typical applications of the INA118PB?
Typical applications include pressure transmitters, temperature transmitters, weigh scales, ECG, analog input modules, and data acquisition systems.
- How does the current-feedback topology of the INA118PB affect its performance?
The current-feedback topology provides wide bandwidth, even at high gain, and excellent settling time.
