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LMC6482IMX/NOPB

Dual CMOS RRIO op-amp, 1.5MHz GBW, 20fA Ibias, SOIC-8, 3-15.5V

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Manufacturer Part：

LMC6482IMX/NOPB

Package：

SOIC-8 (4.9 x 3.9 x 1.58 mm)

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Description

Product Overview

The LMC6482IMX/NOPB from Texas Instruments is a CMOS dual rail-to-rail input and output operational amplifier with 1.5MHz bandwidth, 1.3V/us slew rate, and ultra-low input current of 20fA in SOIC-8 package.

Key Specifications

Amplifier Type Dual CMOS RRIO Op-Amp
Supply Voltage 3V to 15.5V
Gain-Bandwidth Product 1.5 MHz
Slew Rate 1.3 V/us
Input Bias Current 20 fA typical
Input Offset Voltage 110 uV typical
CMRR / PSRR 82 dB
Supply Current 0.7mA per amplifier
Output Swing Rail-to-rail (within 20mV)
Package SOIC-8
Operating Temperature -40 to +85 C

Features

  • Rail-to-rail input common-mode range
  • Rail-to-rail output swing within 20mV
  • Ultra-low input bias current: 20fA
  • 82dB CMRR and PSRR
  • Specified for 3V, 5V, and 15V operation
  • Improved replacement for TLC272/TLC277

Applications

  • Data acquisition and signal conditioning
  • Precision instrumentation
  • Photodiode and transimpedance amplifiers
  • Battery-powered measurement systems

The LMC6482IMX/NOPB from Texas Instruments is a dual CMOS operational amplifier featuring rail-to-rail input and output (RRIO) operation. The input common-mode range extends to both supply rails, enabling direct interfacing with signals at ground or V+ without phase inversion. The output swings within 20mV of either supply rail with a 100kOhm load, maximizing dynamic range in single-supply systems. The ultra-low input bias current of 20fA (0.02pA) makes the LMC6482 ideal for high-impedance sensor interfaces such as photodiode amplifiers, pH probes, and piezoelectric transducers. With a gain-bandwidth product of 1.5MHz, slew rate of 1.3V/us, and CMRR/PSRR of 82dB, the device provides excellent AC and DC precision. The LMC6482 is specified for operation from 3V to 15.5V over the -40C to +85C temperature range and is an improved replacement for TLC272 and TLC277.

The LMC6482IMX/NOPB operates through three main subsystems per amplifier channel: (1) Rail-to-rail input stage – A complementary input pair architecture uses both PMOS and NMOS differential pairs in parallel. When the common-mode voltage is near V-, the PMOS pair is active; when near V+, the NMOS pair takes over. This complementary arrangement ensures linear operation across the entire input common-mode range from V- to V+. The transition between pairs is managed by a smooth crossover circuit that minimizes offset voltage shifts. (2) Gain stage – A high-gain folded-cascode amplifier stage provides the voltage gain of approximately 130dB. Frequency compensation is internal, providing unconditional stability with unity-gain feedback. The 1.5MHz gain-bandwidth product and 1.3V/us slew rate are achieved through careful bias current optimization. (3) Rail-to-rail output stage – A complementary common-source output stage (PMOS pull-up and NMOS pull-down) enables the output to swing within millivolts of either supply rail. The output can source and sink up to 20mA continuously, with short-circuit protection limiting current to approximately 16-30mA depending on supply voltage.

Pin Name Function
1 OUT A Output of amplifier A
2 -IN A Inverting input of amplifier A
3 +IN A Non-inverting input of amplifier A
4 V- Negative supply / ground
5 +IN B Non-inverting input of amplifier B
6 -IN B Inverting input of amplifier B
7 OUT B Output of amplifier B
8 V+ Positive supply (3-15.5V)
  • Data acquisition and signal conditioning with rail-to-rail I/O maximizing ADC dynamic range in 3V single-supply systems
  • Precision instrumentation using 20fA input bias current for photodiode, pH probe, and piezoelectric transducer interfaces
  • Transimpedance amplifier circuits where femtoampere input current prevents error in high-impedance feedback networks
  • Battery-powered measurement systems from 3V to 15.5V with 0.7mA per amplifier quiescent current
Model Manufacturer Key Difference
LMC6484IM/NOPB TI Quad version, SOIC-14
MCP6002-I/SN Microchip 1MHz GBW, lower cost
OPA2314AIDR TI 3MHz GBW, RRIO, precision
TSV912IDT ST 8MHz GBW, RRIO, low power
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