The LM4562 is a high-performance operational amplifier engineered to deliver superior sound accuracy and ultra-low distortion for professional audio systems. Designed by Texas Instruments (TI), it combines precision, speed, and exceptional linearity to meet the demands of studio, hi-fi, and instrumentation environments. This article will discuss the LM4562’s key features, specifications, typical applications, and more.

Catalog

LM4562 Description

The LM4562 is a high-performance, ultra-low distortion operational amplifier designed for professional and high-fidelity audio applications. It delivers clean, detailed, and accurate sound reproduction, making it ideal for studio equipment, preamplifiers, and active filters. With an exceptionally low noise density of 2.7 nV/√Hz and a THD+N of just 0.00003%, it ensures transparent audio amplification without compromise. The amplifier provides a high slew rate of ±20 V/μs and an output current capability of ±26 mA, allowing it to drive 2 kΩ loads within 1 V of the supply rails and 600 Ω loads within 1.4 V.

Engineered for reliability and precision, the LM4562 achieves 120 dB CMRR, 120 dB PSRR, and a low input offset voltage of 0.1 mV, ensuring stable DC performance. It operates across a wide supply range from ±2.5 V to ±17 V, maintaining excellent linearity and minimal bias current. Unity-gain stable and capable of driving complex capacitive loads up to 100 pF, the LM4562 guarantees consistent, distortion-free performance in demanding circuits.

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LM4562 Alternatives and Equivalents

LM4562 Typical Application Circuit

The following examples highlight three common applications of the LM4562 in audio and signal processing: an RIAA phono preamplifier, an NAB tape head preamplifier, and a precision AC/DC converter.

Passively Equalized RIAA Phono Preamplifier

The RIAA Phono Preamplifier circuit uses two LM4562 op-amps to amplify and equalize signals from a turntable cartridge. The first op-amp provides initial voltage gain, while a passive RIAA equalization network of resistors and capacitors restores the original frequency response that was modified during vinyl recording. The second op-amp boosts the equalized signal to line level for output. This design delivers clear, low-noise amplification and preserves the natural tone of vinyl playback, making it ideal for high-fidelity audio systems.

NAB Tape Head Preamplifier

The NAB Preamp circuit demonstrates how the LM4562 can handle low-level signals from a magnetic tape head with high precision. One half of the op-amp amplifies the input signal, while the feedback network applies the standard NAB equalization curve to correct frequency imbalances caused by tape recording. A 47 µF capacitor maintains stable biasing and enhances low-frequency response. This circuit provides clean and accurate sound reproduction, making it suitable for professional tape playback and restoration equipment.

Precision AC/DC Converter

The AC/DC Converter circuit uses two LM4562 op-amps and two 1S1588 diodes to convert an AC input into a DC output equal to the input’s absolute value. The first stage rectifies the signal with high accuracy, while the second stage averages and buffers it to produce a smooth DC voltage. A 10 µF capacitor filters out ripple to ensure stable output. This circuit is often used in measurement and instrumentation systems that require precise AC-to-DC conversion.