Audio Subsystem enhances mobile phone performance.

Press Release Summary:

With architecture that minimizes pop and click, ISL99203 consists of fully integrated class-D mono amplifier combined with capfree headphone amplifier. It operates from 2.4-5.5 V input supply and can deliver 1.5 W of continuous output power with less than 10% THD+N, driving 8 X load from 5 V supply. Speaker amplifier features low-noise modulation scheme and operates with 85% efficiency at 400 mW into 8 X from 5 V supply and has SNR greater than 95 dB.

Original Press Release:

ISL99203 - High Efficiency Audio Subsystem

The ISL99203 is a fully integrated high efficiency class-D mono amplifier combined with a capfree headphone amplifier. It is designed to maximize performance for mobile phone applications while saving valuable board space. The application circuit requires a minimum requirement of external components and operates from a 2.4V to 5.5V input supply.

It is capable of delivering 1.5W of continuous output power with less than 10% THD+N driving a 8W load from a 5V supply. The speaker amplifier of the ISL99203 features a high-efficiency, low-noise modulation scheme. It operates with 85% efficiency at 400mW into 8W from 5V supply and has a signal-to-noise ratio (SNR) that is greater than 95dB. The architecture of the device allows it to achieve very low level pop and click. This minimizes voltage glitches at the output during turn-on and turn-off, thus reducing audible noise on activation and deactivation. EMI suppression is achieved by SRC (Slew Rate Control). The amplifier passes FCC Radiated Emissions Standards with 24 inches of Cable and achieves greater than 20dB margin under FCC limits.

The class-D amplifier is designed to operate without a low pass output filer thus saving cost and board space. The headphone amplifier is a GND-reference capfree amplifier. It can output up to 35mW into 32W at 3.3V.

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