The WM9712L is a highly integrated input/output device designed for mobile computing and communications. The device can connect directly to a 4-wire or 5-wire touchpanel, mono or stereo microphones, stereo headphones, and a mono speaker, reducing total component count in the system. Additionally, phone input and output pins are provided for seamless integration with wireless communication devices. The WM9712L also offers up to four auxiliary ADC inputs for analogue measurements such as temperature or light, and five GPIO pins for interfacing to buttons or other digital devices. To monitor the battery voltage in portable systems, the WM9712L has two uncommitted comparator inputs. All device functions are accessed and controlled through a single AC-Link interface compliant with the AC’97 standard. Additionally, the WM9712L can generate interrupts to indicate pen down, pen up, availability of touchpanel data, low battery, dead battery, and GPIO conditions. The WM9712L operates at supply voltages from 1.8 to 3.6 Volts. Each section of the chip can be powered down under software control to save power. The device is available in a small leadless 7x7mm QFN package, ideal for use in handheld portable systems.
The WM9712L is a compact 7 × 7 mm QFN codec designed for mobile computing and communications. It supports 4‑wire or 5‑wire touch‑panel interfaces, stereo or mono microphones, headphones, speakers, and includes auxiliary ADC inputs for sensor measurements as well as GPIO pins for digital control. Typical applications include PDAs, smartphones, handheld and tablet computers.
Key features include AC'97 Rev 2.2 compatible stereo audio, DAC SNR of 94 dB, ADC SNR of 92 dB, on‑chip 45 mW headphone driver, 400 mW mono speaker driver, up to five GPIO pins, four auxiliary ADC inputs, and two comparator inputs for battery monitoring. The device operates from 1.8 V to 3.6 V and is supplied in a leadless QFN package.
| Supply voltage range | 1.8 V to 3.6 V |
|---|---|
| DAC Signal‑to‑Noise Ratio | 94 dB |
| ADC Signal‑to‑Noise Ratio | 92 dB |
| Headphone driver power | 45 mW |
| Speaker driver power | 400 mW |
| Package type | 7 × 7 mm QFN |
| GPIO pins | up to 5 |
| Auxiliary ADC inputs | up to 4 |
| Operating temperature range | -25 °C to +85 °C |
The device operates from 1.8 V up to 3.6 V.
The codec provides up to five GPIO pins for digital I/O.
The DAC achieves a signal‑to‑noise ratio of 94 dB.
It is supplied in a 7 × 7 mm leadless QFN package.