Datasheet

LM7301
www.ti.com SNOS879H –AUGUST 1999–REVISED MARCH 2013
OPTICAL LINE ISOLATION FOR MODEMS
The combination of the low distortion and good load driving capabilities of the LM7301 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 LM7301 fulfills this need, in this and in other
telecom applications. Please refer to STABILITY CONSIDERATIONS for methods used to ensure stability under
all load conditions.
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 LM7301 offers the tiny package,
higher bandwidths, and greater output drive capability than other rail-to-rail input/output parts can provide for this
application.
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