The WM9701 is a low power, full duplex stereo codec with integrated touch screen controller designed for portable audio and multimedia applications. It's a highly integrated device that incorporates a variety of functions, including analog-to-digital converters (ADCs) and digital-to-analog converters (DACs), along with a touch screen controller interface.

Applications:

• PDAs (Personal Digital Assistants)
• Portable Media Players (PMPs)
• Smartphones
• Tablet Computers
• Any battery-powered device requiring audio and touch screen functionality

Features:

• Stereo ADC and DAC: High-quality audio conversion for both recording and playback.
• Integrated Touch Screen Controller: Simplifies touch screen implementation and reduces external component count.
• Low Power Consumption: Optimised for battery-powered devices, extending battery life.
• Full Duplex Operation: Allows simultaneous recording and playback.
• Flexible Audio Interface: Supports various audio data formats and sampling rates.
• I2C Control Interface: Provides easy access for configuration and control.
• Microphone Bias: Integrated microphone bias circuitry eliminates the need for external components.
• Headphone Driver: Integrated headphone amplifier for direct headphone connection.

Benefits:

• Reduced Component Count: Integration of audio codec and touch screen controller minimizes the number of external components required.
• Lower Power Consumption: Enables longer battery life in portable devices.
• Improved Audio Quality: High-performance ADCs and DACs deliver superior audio performance.
• Simplified Design: Easy-to-use I2C control interface simplifies system integration.
• Cost-Effective: Integration reduces overall system cost.
• Faster Time-to-Market: Simplified design and integration accelerate product development.

Additional Details:

The WM9701 typically operates from a low voltage supply (e.g., 3.3V). It features programmable gain amplifiers (PGAs) for both ADC and DAC paths, allowing for flexible audio level adjustment. The touch screen controller supports 4-wire resistive touch screens and provides accurate touch position detection. The device is available in a compact package, making it suitable for space-constrained applications. It supports various audio formats like PCM and I2S.