Datasheet

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+
+V
CC
-V
EE
V
OUT
V
IN
LM7341
www.ti.com 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
the LM7341, as stated in the Absolute Maximum Ratings section, this maximum voltage is V
IN
Differential =
±15V. Beyond this limit, even for a short time, damage to the device may occur.
As an inverting comparator at V
S
= 30V and 1V of overdrive there is typically 12 μs of propagation delay. At V
S
=
30V and 50 mV of overdrive there is typically 17 µs of propagation delay.
Figure 53. Inverting Comparator
Similarly a non-inverting comparator at V
S
= 30V and 1V of overdrive there is typically 12 µs of propagation
delay. At V
S
= 30V and 50 mV of overdrive there is typically 17 μs of propagation delay.
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