LM4562 — Ultra-Low Distortion Dual Audio Operational Amplifier

Overview

The LM4562 (commonly LM4562NA in DIP-8 or LM4562MA in SOIC-8) is an ultra-low distortion, low-noise, high-slew-rate dual audio operational amplifier manufactured by Texas Instruments (originally National Semiconductor). Belonging to TI's high-fidelity audio series, it sets a benchmark for audio signal processing with a Total Harmonic Distortion plus Noise ( $\text{THD+N}$ ) of just $0.00003\%$ .

With an extremely low input noise density of $2.7\text{ nV}/\sqrt{\text{Hz}}$ , a high gain-bandwidth product of $55\text{ MHz}$ , and a fast slew rate of $20\text{ V}/\mu\text{s}$ , the LM4562 is widely used as an op-amp rolling upgrade in DAC output stages, headphone amplifiers, phono preamplifiers, and high-end audio gear.

Quick reference


Op-Amp Type	Dual Ultra-Low Distortion High-Fidelity Audio Op-Amp
Package	8-Pin DIP (Through-Hole) / SOIC-8
Supply Voltage Range ( $V_{CC}$ )	$\pm 2.5\text{ V}$ to $\pm 17.0\text{ V}$ ( $5.0\text{ V}$ to $34.0\text{ V}$ single supply)
THD+N	$0.00003\%$ typical ( $f = 1\text{kHz}, R_L = 600\ \Omega$ )
Input Noise Voltage	$2.7\text{ nV}/\sqrt{\text{Hz}}$ at $f = 1\text{kHz}$
Gain Bandwidth Product (GBW)	$55\text{ MHz}$
Slew Rate	$20\text{ V}/\mu\text{s}$
Output Drive Capability	Drives $600\ \Omega$ loads to $V_{CC} - 1\text{V}$ rail-to-rail headroom

Pinout (Standard Dual Op-Amp 8-Pin Package)

text

        ┌──────────┐
  1OUT ─│ 1      8 │─ V+
  1IN- ─│ 2      7 │─ 2OUT
  1IN+ ─│ 3      6 │─ 2IN-
    V- ─│ 4      5 │─ 2IN+
        └──────────┘

Pin	Name	Description
1	`1OUT`	Operational Amplifier 1 output
2	`1IN-`	Operational Amplifier 1 inverting input
3	`1IN+`	Operational Amplifier 1 non-inverting input
4	`V-` / `GND`	Negative power supply rail ( $-15\text{V}$ for dual supply, $0\text{V}$ for single supply)
5	`2IN+`	Operational Amplifier 2 non-inverting input
6	`2IN-`	Operational Amplifier 2 inverting input
7	`2OUT`	Operational Amplifier 2 output
8	`V+`	Positive power supply rail ( $+15\text{V}$ for dual supply)

Specifications

Parameter	Symbol	Min	Typ	Max	Unit	Conditions
Supply Voltage Range	$V_{CC}$	$\pm 2.5$	$\pm 15$	$\pm 17$	V	Dual supply range
Total Harmonic Distortion	$\text{THD+N}$	—	0.00003	—	%	$f = 1\text{kHz}, V_{OUT} = 3\text{Vrms}, R_L = 600\Omega$
Input Noise Density	$e_n$	—	2.7	4.0	$\text{nV}/\sqrt{\text{Hz}}$	$f = 1\text{kHz}$
Slew Rate	$SR$	15	20	—	$\text{V}/\mu\text{s}$	$R_L = 2\text{k}\Omega$
Gain Bandwidth Product	$GBW$	—	55	—	MHz	$f = 100\text{kHz}$
Open-Loop Voltage Gain	$A_{VD}$	110	140	—	dB	$R_L = 600\Omega$
Supply Current	$I_S$	—	10	12	mA	Both amplifiers ( $I_O = 0$ )

Common mistakes

Leaving supply bypass capacitors off: Because the LM4562 has a wide $55\text{ MHz}$ bandwidth, place $100\text{ nF}$ ceramic decoupling capacitors directly across Pin 8 (V+) to GND and Pin 4 (V-) to GND. Omitting supply bypass caps can induce high-frequency parasitic oscillation.
Operating on single 5V logic supply without biasing inputs: The LM4562 is not a rail-to-rail input op-amp. When operating on a single +5V supply, input signals must be biased to mid-rail ( $2.5\text{ V}$ ) to prevent input clipping.

Notes

LME49720 Equivalence: The LME49720 is functionally identical to the LM4562 (same silicon die packaged under TI/National's LME high-performance audio series).

Interface	Dual Op-Amp Terminals (1IN+, 1IN-, 1OUT, 2IN+, 2IN-, 2OUT)
Package	8-pin PDIP / SOIC-8