Date: 24/10/2006

Class D audio amplifier from National brings down the EMI in audio

National has released LM4675, a new mono 266watt class D audio amplifier with EMI ( Electron Magnetic Interference) reduced by using pulse width modulation architecture. National uses spread spectrum technology to achieve higher efficiency of greater than 80%.

The key features are,
Current consumption of 1.6mA @ 2.7V.
I/P voltage - 2.4 to 5.5V.
Short circuit protection.
Over load protection.
Transient suppression during power-on and shutdown.
Can drive 4 ohm speaker at 2.2 watts.
Continuous O/P with less than 1% total harmonic distortion.
PSRR of 82dB at 217Hz.
CMRR of 80dB and SNR of 82dB.
Package: 8 pin LLP package.
Available: Now.
Price: 98 cents each (in 1k order quantity).