Date: 18/10/2008

Audio amplifier with fault detection for automotive instrument clusters

National Semiconductor released to market a new monolithic power amplifier, LM48100Q for automotive warning and alert tone amplification. This new integrated device amplifies warning tones in automobile driver warning systems such as signal change, back up warning and collision avoidance.
Some of the features of LM48100Q are listed below:
1. Mono bridge-tied load amplifier with I2C-compatible volume control.
2. Operation temp range of -40 degrees C and 105 degrees C.
3. Open drain FAULT output of the amplifier indicates when a fault has occurred
4. The output short circuit and thermal overload protection prevents damage during a fault condition.
5. Features open circuit condition detection circuits
6. It offers dual audio inputs that can be mixed and multiplexed to the device output, with each path having its own independent 32-step volume control.
7. Low quiescent current of 6 mA at 5V
8. Delivers 1.3W of continuous output power to an 8-Ohm load with less than one percent total harmonic distortion plus noise.
9. The flexible power supply requirements allow operation from 3V to 5.5V.
10. Power supply rejection ratio (PSRR) of 74 dB at 1 kHz
11. A low power shutdown mode reduces supply current consumption to 0.01 uA.
12. Its "pop-and-click" circuitry eliminates noise that occurs during turn-on and turn-off transitions and during shutdown.
Packaging: 14-pin TSSOP package
Price: $1.50 each in 1K-unit quantities
Additional company and product information is available at: http://www.national.com