ISL99203
High Efficiency Audio Subsystem
Key Features
- Operating Voltage 2.4V to 5.5V
- Low Quiescent Current
- Low Shutdown Current
- Low RFI Susceptibility
- Integrated Bypass Switch, I2C Controlled
- I2C Control Interface
- 40 Step Digital Volume Control
- 3 Independent Volume Channels
- 10 Distinct Output Modes
- Speaker Amp Class-D
- Protection for UV/TSD/OC
- Independent Gain Boost for Headphone and Speaker
- All Digital Interfaces 1.8V Compatible
- Exposed Pad at Ground Voltage
Description
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 8Ω 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 8Ω 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 32Ω at 3.3V.
Applications
- Mobile Phones
- PDAs
- Portable Media Players
- Portable Gaming
