Overview
The LMP7702 from Texas Instruments is a dual, low-offset, rail-to-rail input and output precision amplifier. It is part of the LMP™ precision amplifier family and is designed for high-accuracy applications such as sensor interfaces and instrumentation. The LMP7702 features a CMOS input stage and a wide supply voltage range of 2.7 V to 12 V, making it versatile for various operating conditions. Its low input bias current and low input referred voltage noise enhance its performance in precision applications.
Key Specifications
| Parameter | Typical Value | Maximum Value | Unit |
|---|---|---|---|
| Input Offset Voltage | ±220 µV | ±520 µV | µV |
| Input Bias Current | ±200 fA | ±1 pA | A |
| Input Referred Voltage Noise | 9 nV/√Hz | nV/√Hz | |
| Common-Mode Rejection Ratio (CMRR) | 130 dB | dB | |
| Open-Loop Gain | 130 dB | dB | |
| Unity-Gain Bandwidth | 2.5 MHz | MHz | |
| Supply Current | 1.5 mA | 2.9 mA | mA |
| Supply Voltage Range | 2.7 V to 12 V | V | |
| Temperature Range | −40°C to 125°C | °C | |
| Slew Rate | 1 V/μs | V/μs | |
| Output Voltage Swing | Within 40 mV of either rail | mV |
Key Features
- Low Input Bias Current: ±200 fA, ideal for high-impedance sensor interfaces.
- Low Input Referred Voltage Noise: 9 nV/√Hz, enhancing signal integrity in noise-sensitive applications.
- Rail-to-Rail Input and Output: Allows the output to swing within 40 mV of either rail, maximizing signal dynamic range.
- Wide Supply Voltage Range: Operates from 2.7 V to 12 V, making it suitable for a variety of power supply conditions.
- High CMRR and Open-Loop Gain: 130 dB CMRR and 130 dB open-loop gain ensure high accuracy and stability.
- Compact Packaging: Available in 8-Pin SOIC and 8-Pin VSSOP packages, suitable for space-constrained designs.
Applications
- High Impedance Sensor Interface: Ideal for interfacing with high-impedance sensors due to its low input bias current.
- Battery-Powered Instrumentation: Suitable for battery-powered devices due to its low power consumption.
- High Gain Amplifiers: Can be used in high-gain configurations due to its high open-loop gain.
- DAC Buffer: Can be used to buffer digital-to-analog converters to improve signal integrity.
- Instrumentation Amplifier: Can be configured as an instrumentation amplifier for differential signal amplification.
- Active Filters: Can be used in active filter circuits to enhance signal processing capabilities.
Q & A
- What is the input offset voltage of the LMP7702?
The input offset voltage of the LMP7702 is typically ±220 µV, with a maximum value of ±520 µV.
- What is the input bias current of the LMP7702?
The input bias current of the LMP7702 is typically ±200 fA.
- What is the input referred voltage noise of the LMP7702?
The input referred voltage noise of the LMP7702 is 9 nV/√Hz.
- What is the common-mode rejection ratio (CMRR) of the LMP7702?
The CMRR of the LMP7702 is 130 dB.
- What is the supply voltage range of the LMP7702?
The LMP7702 operates from a supply voltage range of 2.7 V to 12 V.
- What are the typical applications of the LMP7702?
The LMP7702 is typically used in high impedance sensor interfaces, battery-powered instrumentation, high gain amplifiers, DAC buffers, instrumentation amplifiers, and active filters.
- What are the available packages for the LMP7702?
The LMP7702 is available in 8-Pin SOIC and 8-Pin VSSOP packages.
- What is the temperature range of the LMP7702?
The LMP7702 operates over a temperature range of −40°C to 125°C.
- What is the slew rate of the LMP7702?
The slew rate of the LMP7702 is 1 V/μs.
- How does the LMP7702 handle rail-to-rail input and output?
The LMP7702 features rail-to-rail input and output, allowing the output to swing within 40 mV of either rail.
