March 27, 2008

LME49722

Low Noise, High Performance, High Fidelity Dual Audio

Operational Amplifier

General Description

The LME49722 is part of the ultra-low distortion, low noise,

high slew rate operational amplifier series optimized and fully

specified for high performance, high fidelity applications.

Combining advanced leading-edge process technology with

state-of-the-art circuit design, the LME49722 audio opera-

tional amplifiers deliver superior audio signal amplification for

outstanding audio performance. The LME49722 combines

extremely low voltage noise density (1.9nV/

vanishingly low THD+N (0.00002%) to easily satisfy the most

demanding audio applications. To ensure that the most chal-

lenging loads are driven without compromise, the LME49722

has a high slew rate of ±22V/µs and an output current capa-

bility of ±28mA. Further, dynamic range is maximized by an

output stage that drives 2k

Ω loads to within 1V of either power

supply voltage.

The LME49722 has a wide supply range of ±2.5V to ±18V.

Over this supply range the LME49722 maintains excellent

common-mode and power supply rejection, and low input bias

current. This Audio Operational Amplifier achieves outstand-

ing AC performance while driving complex loads with values

as high as 100pF with gain value greater than 2. Directly in-

terchangeable with LME49720, LM4562 and LME49860 for

similar operating voltages.

Key Specifications

±2.5V to ±18V

(Frequency = 1kHz)

1.9nV/

(Frequency = 10Hz)

2.8nV/

120dB (typ)

±22V/

μs (typ)

(A

R

0.00002% (typ)

R

0.00002% (typ)

135dB (typ)

50nA (typ)

±0.02mV (typ)

Features

Applications

multimedia

active filters

measurement, and ultrasound

Typical Application

30057910

FIGURE 1. Wide Bandwidth Low Noise Low Drift Amplifier

© 2008 National Semiconductor Corporation

300579

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