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LM7341

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SNOSAW9B – MAY 2008 – REVISED MARCH 2013

LOW DISTORTION, HIGH OUTPUT DRIVE CAPABILITY

The LM7341 offers superior low-distortion performance, with a total-harmonic-distortion-plus-noise of

−66 dB at f

= 10 kHz. The advantage offered by the LM7341 is its low distortion levels, even at high output current and low

load resistance.

Typical Applications

HANDHELD REMOTE CONTROLS

The LM7341 offers outstanding specifications for applications requiring good speed/power trade-off. In

applications such as remote control operation, where high bandwidth and low power consumption are needed.

The LM7341 performance can easily meet these requirements.

OPTICAL LINE ISOLATION FOR MODEMS

The combination of the low distortion and good load driving capabilities of the LM7341 make it an excellent

choice for driving opto-coupler circuits to achieve line isolation for modems. This technique prevents telephone

line noise from coupling onto the modem signal. Superior isolation is achieved by coupling the signal optically

from the computer modem to the telephone lines; however, this also requires a low distortion at relatively high

currents. Due to its low distortion at high output drive currents, the LM7341 fulfills this need, in this and in other

telecom applications.

REMOTE MICROPHONE IN PERSONAL COMPUTERS

Remote microphones in Personal Computers often utilize a microphone at the top of the monitor which must

drive a long cable in a high noise environment. One method often used to reduce the nose is to lower the signal

impedance, which reduces the noise pickup. In this configuration, the amplifier usually requires 30 dB–40 dB of

gain, at bandwidths higher than most low-power CMOS parts can achieve. The LM7341 offers the tiny package,

higher bandwidths, and greater output drive capability than other rail-to-rail input/output parts can provide for this

application.

LM7341 AS A COMPARATOR

The LM7341 can also be used as a comparator and provides quite reasonable performance. Note however that

unlike a typical comparator an op amp has a maximum allowed differential voltage between the input pins. For

±15V. Beyond this limit, even for a short time, damage to the device may occur.

30V and 50 mV of overdrive there is typically 17 µs of propagation delay.

Figure 53. Inverting Comparator

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