Texas Instruments LMV797MM

Overview

LMV797MM from Texas Instruments is a dual-channel, low-noise, CMOS-input operational amplifier optimized for low-voltage, high-fidelity signal conditioning. It delivers 5.8 nV/√Hz input voltage noise density, 17 MHz unity-gain bandwidth, and rail-to-rail output swing within a 1.8 V to 5.5 V supply range - enabling precision photodiode amplification and sensor interface in battery-powered medical and automotive systems.

For engineers reviewing the LMV797MM datasheet, LMV797MM pinout, LMV797MM application, or LMV797MM equivalent, key selection criteria include its 100 fA input bias current, guaranteed 2.5 V/5.0 V performance, −40°C to 125°C operating temperature, 0.01% THD+N at 1 kHz into 600 Ω, and 8-pin VSSOP package compatibility with space-constrained PCB layouts.

Technical Context

The LMV797MM employs a CMOS input stage with sub-picoampere bias current and a proprietary rail-to-rail output architecture capable of sourcing ≥40 mA at 1.8 V while maintaining 25 mV from rail into 10 kΩ. Its 17 MHz gain-bandwidth product and 9.5 V/μs slew rate support stable unity-gain operation with capacitive loads up to 120 pF.

It features an input common-mode range extending to the negative rail (ground-sensing), 80 dB minimum CMRR over 0–3.7 V common-mode voltage, and 80 dB PSRR across 1.8–5.5 V supply - all specified over full industrial and automotive temperature ranges without derating.

Key Specifications

Pinout & Package

LMV797MM is housed in an 8-pin VSSOP (Very Small Outline Package) with 0.65 mm lead pitch, 3.0 mm × 3.0 mm body size, and exposed thermal pad for enhanced power dissipation in compact layouts.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual low-noise op amp applications.

Compared with OPA2376IDGKR and ADA4807-2ARMZ, the LMV797MM uniquely balances ultra-low input bias current (100 fA), sub-6 nV/√Hz noise, 17 MHz bandwidth, and VSSOP packaging - making it optimal for miniaturized, battery-operated sensor nodes where leakage, noise, and board space are co-constrained.

Availability

LMV797MM is available at Aetrix Electronics and suitable for photodiode amplifiers, medical sensor interfaces, and automotive cabin sensing requiring stable component supply across extended temperature and voltage ranges.

Supply support for LMV797MM includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.

The LMV797MM belongs to TI's precision low-noise op amp portfolio, designed specifically for high-fidelity, low-voltage signal conditioning in sensor, medical, and automotive applications where input bias current, noise, and rail-to-rail operation are critical.

FAQ

What is the maximum capacitive load the LMV797MM can drive in unity-gain configuration without instability?

The LMV797MM is characterized to remain stable with up to 120 pF capacitive load in unity-gain follower configuration, as verified by phase margin measurements across temperature and supply voltage. This eliminates need for external isolation resistors when driving typical ADC input capacitors or short PCB traces. For loads exceeding 120 pF, a series isolation resistor (e.g., 10–50 Ω) between LMV797MM output and CL is recommended to maintain ≥45° phase margin.

Does the LMV797MM support true single-supply operation with input signals referenced to ground?

Yes, the LMV797MM features a ground-sensing input common-mode range that extends to V− (0 V), allowing direct connection of grounded sensors such as thermistors, strain gauges, or bridge circuits without level-shifting circuitry. Its rail-to-rail output also swings within 25 mV of both rails into 10 kΩ, preserving full dynamic range in 2.5 V or 3.3 V systems.

How does the LMV797MM's input bias current compare to bipolar-input op amps in sensor applications?

The LMV797MM's CMOS input delivers ≤100 fA typical input bias current - over six orders of magnitude lower than typical bipolar-input op amps (e.g., 10–100 nA). In high-impedance sensor interfaces (e.g., >100 MΩ photodiode or pH electrode), this prevents significant offset errors and signal attenuation, ensuring accuracy in nanoamp-level current measurement circuits.

Is the LMV797MM pin-compatible with other dual op amps in VSSOP-8 packages?

No, the LMV797MM uses a non-standard VSSOP-8 pinout (OUT A, IN− A, IN+ A, V−, IN+ B, IN− B, OUT B, V+) that differs from industry-standard dual op amp arrangements (e.g., SOIC-8 pin 1 = OUT A, pin 2 = IN− A, pin 3 = IN+ A, pin 4 = V−). Direct replacement requires PCB layout revision; always verify pin mapping before substitution.

What is the guaranteed performance of the LMV797MM at 1.8 V supply voltage?

The LMV797MM is fully specified for operation at 1.8 V supply voltage across 0°C to 125°C ambient temperature, including parameters such as input offset voltage (±1.65 mV max), supply current (1.30 mA/ch typ), and output swing (≥45 mV from rail into 2 kΩ). This enables use in energy-harvesting and ultra-low-power IoT sensor nodes where battery voltage drops to 1.8 V.