Texas Instruments LME49724MRX

Overview

LME49724MRX from Texas Instruments is a fully-differential audio operational amplifier optimized for ultra-high-fidelity signal amplification, delivering 0.00003% THD+N at 1 kHz, ±18 V/μs slew rate, and 2.1 nV/√Hz input noise density. It drives 600 Ω loads to 52 V_P-P on ±15 V supplies and features output short-circuit protection, enabling use in professional line drivers and ADC front-ends.

For engineers reviewing the LME49724MRX datasheet, LME49724MRX pinout, LME49724MRX application, or LME49724MRX equivalent, key selection considerations include its VOCM-controlled common-mode output, ENABLE pin for power management, differential output swing capability, and SO PowerPad thermal performance in high-current audio signal chains.

Technical Context

The LME49724MRX implements a fully-differential architecture with dedicated VIN+, VIN−, VOUT+, VOUT−, and VOCM terminals, enabling precise control of output common-mode voltage independent of gain configuration. Its internal resistor divider sets VOCM to mid-supply when left unconnected, but external biasing allows DC level shifting for ADC interfacing or single-supply operation.

It supports unity-gain stability while driving complex capacitive loads up to 100 pF, and integrates an ENABLE pin that reduces quiescent current to <0.3 mA in standby. PSRR (125 dB typ) and CMRR (102 dB typ) are maintained across ±2.5 V to ±18 V supply range, ensuring robust rejection of supply and common-mode noise in sensitive analog signal paths.

Key Specifications

Pinout & Package

The LME49724MRX is housed in an 8-pin SOIC with exposed PowerPad (DDA0008B), optimized for thermal dissipation in high-output-current audio stages. The exposed pad must be soldered to a PCB copper plane connected to VEE or electrically isolated for optimal junction temperature control.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar fully-differential audio amplifier applications.

Compared with OPA1632DR and LM4562MA, the LME49724MRX uniquely combines differential output architecture, VOCM control, ENABLE functionality, and industry-leading 0.00003% THD+N-making it the sole option for new designs requiring true balanced signal integrity at professional audio levels.

Availability

LME49724MRX is available at Aetrix Electronics and suitable for professional audio equipment, high-resolution data acquisition systems, and studio-grade signal conditioning circuits requiring stable component supply and long-term production continuity.

Supply support for LME49724MRX 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 specializing in analog and embedded processing technologies, with decades of expertise in high-performance audio and precision signal chain solutions.

The LME49724MRX belongs to TI's LME audio op-amp family, engineered specifically for ultra-low-distortion, high-slew-rate fully-differential amplification in demanding professional and audiophile applications.

FAQ

What is the function of the VOCM pin on the LME49724MRX?

The VOCM pin on the LME49724MRX sets the DC common-mode voltage of both differential outputs (VOUT+ and VOUT−). Internally biased to mid-supply when floating, it accepts an external voltage (with 50 kΩ input impedance) to align output DC level with ADC reference or downstream stage requirements. Proper VOCM control is essential for maximizing dynamic range and avoiding clipping in differential signal chains.

Can the LME49724MRX operate from a single supply?

Yes, the LME49724MRX supports single-supply operation from 5 V to 36 V. In this mode, the VOCM pin must be used to set the output common-mode voltage-typically to V_CC/2 or another defined reference-since the internal divider defaults to mid-supply. Input common-mode range remains limited to VEE + 1.5 V to VCC – 1.5 V, requiring careful signal centering.

How does the ENABLE pin affect power consumption in the LME49724MRX?

The ENABLE pin reduces total quiescent current of the LME49724MRX from 10–15 mA (active) to under 0.3 mA (disabled) when pulled ≤ VEE + 1.75 V. This feature enables power-gating in battery-powered or energy-conscious audio systems. For split-supply designs, tie ENABLE to VEE for standby; for single-supply, tie to GND.

What is the maximum capacitive load the LME49724MRX can drive stably?

The LME49724MRX is characterized for stable operation with capacitive loads up to 100 pF without external compensation. Loads exceeding this value-such as long shielded cables or ADC input capacitance-require series isolation resistors (e.g., 10–47 Ω) at each output to maintain phase margin and prevent peaking or oscillation.

Why does the LME49724MRX use an SO PowerPad package?

The SO PowerPad package (DDA0008B) of the LME49724MRX reduces thermal resistance (θ_JA = 49.6 °C/W) by integrating an exposed copper pad soldered directly to a PCB thermal plane. This is critical for dissipating heat generated during ±80 mA output current delivery and sustained high-slew-rate operation-preventing thermal derating in compact, high-density audio PCBs.