Reduced Smartphone Interference with Efficiency Audio Amplifiers

The Class-AB audio amplifiers provide improved quiescent current reduction and decreased smart phone signal interference. The integrated GSM input filtering is built in for increased EMC robustness. The TDF8546A (4x 25Watt) and TDF8548A (4x 28Watt) are also a part of the Class-AB amplifiers that extend line driver detection to 1kOhm load impedance.

As smartphone connectivity becomes increasingly central to automotive infotainment applications, the industry has to ensure that audio quality is not compromised by smartphone signal interference. Designed specifically for automotive applications, NXP’s Class-AB audio amplifiers provide increased GSM robustness to mitigate the influence of smartphones on loud speakers, responding to OEMs’ demand for a cost-effective solution that improves sound quality.

The TDF8546, TDF8546A and TDF8548A amplifiers are quad-channel Class-AB amplifiers available with NXP’s ground-breaking Best Efficiency Mode operating as low as 6V, reducing power dissipation by 17% compared to other high-efficiency solutions in its class. Both amplifiers enable a seamless audio experience during sudden supply voltage drops in hybrid electric vehicles and other cars using start-stop systems.

The enhancement of Class-AB audio amplifiers further supports NXP’s vision of connecting the car.

Features:

Four channels operating at various signal condition
4 x 25W (TDF8546A) output power (14.4V, 10% THD, 4 Ohm)
4 x 28W (TDF8548A) output power (14.4V, 10% THD, 4 Ohm)
Operating supply voltage from 6 to 18V
Excellent sound performance – no pop noise; suitable for 2 Ohm to 4 Ohm speakers
Best Efficiency Mode – low quiescent current per channel
Power dissipation reduced by 17% compared to other high-efficiency Class-AB amplifiers
Power dissipation reduced by 35% compared to standard Class-AB amplifiers
No switch noise due to ‘soft switching’
Protection against short thermal overload and ESD (Electrostatic Discharge)
I2C bus diagnostics, including start-up diagnostics, clip detection and pre-warning
Small footprint: HSOP36 and DBS27 packages