Overview
The INA128P, produced by Texas Instruments, is a low-power, general-purpose instrumentation amplifier known for its excellent accuracy and versatility. This amplifier is part of the INA12x series, which includes the INA128 and INA129. The INA128P is designed with a three-op amp configuration and features current-feedback input circuitry, providing wide bandwidth even at high gain settings. It is available in 8-pin plastic DIP and SO-8 surface-mount packages, making it suitable for a wide range of applications. The device operates within a temperature range of –40°C to +85°C and is compliant with industry standards such as EU RoHS.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Input Offset Voltage | ±50 µV (max) | µV |
| Offset Voltage Drift | ±0.5 µV/°C (max) | µV/°C |
| Input Bias Current | ±5 nA (max) | nA |
| Common Mode Rejection Ratio (CMRR) | 120 dB (min) | dB |
| Bandwidth | 1.3 MHz (G = 1), 200 kHz (G = 100) | MHz, kHz |
| Slew Rate | 4 V/µs | V/µs |
| Supply Voltage Range | ±2.25 V to ±18 V | V |
| Quiescent Current | 700 µA | µA |
| Operating Temperature Range | –40°C to +85°C | °C |
| Safe Input Voltage | ±40 V | V |
| Gain Range | 1 to 10,000 | V/V |
Key Features
- Low offset voltage: 50 µV maximum.
- Low drift: 0.5 µV/°C maximum.
- Low input bias current: 5 nA maximum.
- High CMRR: 120 dB minimum.
- Wide bandwidth: 1.3 MHz at G = 1, 200 kHz at G = 100.
- Inputs protected to ±40 V.
- Wide supply range: ±2.25 V to ±18 V.
- Low quiescent current: 700 µA.
- Available in 8-pin plastic DIP and SO-8 surface-mount packages.
- Single external resistor sets gain from 1 to 10,000.
Applications
- Bridge amplifier.
- Thermocouple amplifier.
- RTD sensor amplifier.
- Medical instrumentation.
- Data acquisition.
Q & A
- What is the maximum input offset voltage of the INA128P?
The maximum input offset voltage is ±50 µV.
- What is the temperature drift of the offset voltage?
The temperature drift of the offset voltage is ±0.5 µV/°C.
- What is the input bias current of the INA128P?
The input bias current is ±5 nA maximum.
- What is the common mode rejection ratio (CMRR) of the INA128P?
The CMRR is 120 dB minimum.
- What is the bandwidth of the INA128P at different gain settings?
The bandwidth is 1.3 MHz at G = 1 and 200 kHz at G = 100.
- How is the gain of the INA128P set?
The gain is set by a single external resistor connected between pins 1 and 8, using the equation g = 1 + 50 kΩ/RG.
- What are the available packages for the INA128P?
The INA128P is available in 8-pin plastic DIP and SO-8 surface-mount packages.
- What is the operating temperature range of the INA128P?
The operating temperature range is –40°C to +85°C.
- What is the safe input voltage range for the INA128P?
The safe input voltage range is ±40 V.
- What are some common applications of the INA128P?
Common applications include bridge amplifier, thermocouple amplifier, RTD sensor amplifier, medical instrumentation, and data acquisition).
