Audio Codec 2ADC /2 DAC 24-Bit 129-Pin BGA

The WM8350 is an integrated audio and power management subsystem which provides a cost effective, single-chip solution for portable audio and multimedia systems. The integrated audio CODEC provides all the necessary functions for high-quality stereo recording and playback. Programmable on-chip amplifiers allow for the direct connection of headphones and microphones with a minimum of external components. A programmable low-noise bias voltage is available to feed one or more electret microphones. Additional audio features include programmable high-pass filter in the ADC input path. The WM8350 includes six programmable DC-DC converters, four low-dropout (LDO) regulators and a current limit switch to generate suitable supply voltages for each part of the system, including the integrated audio CODEC as well as off-chip components such as a digital core and I/O supplies, and LED lighting. An additional on-chip regulator maintains the backup power for always-on functions. The WM8350 can be powered by a lithium battery, by a wall adaptor or USB. An on-chip battery charger supports both trickle charging and fast (constant current, constant voltage) charging of single-cell lithium batteries. The charge current, termination voltage, and charger time-out are programmable to suit different types of batteries. Internal power management circuitry controls the start-up and shutdown sequencing of clocks and supply voltages. It also detects and handles conditions such as under-voltage, extreme temperatures, and deeply discharged or defective batteries, with a minimum of software involvement. Two programmable constant-current sinks are available for driving LED strings, e.g. for display backlights or photo-flash applications, in a highly power-efficient way. Additional RGB LEDs can be driven through GPIO pins.

• Stereo Hi-Fi CODEC
• DAC SNR 95dB (‘A’ weighted @ 48kHz), THD –81dB
• ADC SNR 95dB (‘A’ weighted @ 48kHz), THD –83dB
• 40mW on-chip headphone driver with ‘capless’ option
• 16? headphone load: THD -72dB, Po = 20mW
• 2 differential microphone inputs with low-noise bias voltage and programmable preamps
• Programmable high-pass filter for ADC
• Microphone and Headphone detection
• Auxiliary inputs for analogue signals
• Sample rates: 8, 11.025, 16, 22.05, 24, 32, 44.1 or 48kHz
• System Control
• Support for 2-wire or 3-/4-wire Control Interface
• Handles power sequencing, reset signals and fault conditions
• Autonomous power source selection (battery, wall adaptor or USB bus)
• Total current drawn from USB bus is limited to comply with USB 2.0 standard and USB OTG supplement
• Supply Generation
• 2 x DC-DC Buck Converters (0.85V - 3.4V, Up to 1A)
• 2 x DC-DC Buck Converters (0.85V - 3.4V, Up to 500mA)
• 2 x DC-DC Boost Converters (5V - 20V, 40 to 200mA)
• 4 x LDO voltage regulators (0.9V - 3.3V, 150mA)
• LED Drivers
• 2 programmable constant-current sinks, suitable for screen backlight or white LED photo flash
• 3 open-drain outputs for RGB LEDs
• Battery Charger
• Single-cell Li-Ion / Li-Pol battery charger
• Thermal protection for charge control; temperature monitoring available for thermal regulation
• LED outputs to indicate charge status and fault conditions
• Additional Features
• “Always on” RTC with wake-up alarm
• Watchdog timer
• Up to 13 configurable GPIO pins
• On-chip crystal oscillator and internal RC oscillator
• Low power FLL supporting wide range of input clocks
• 7x7mm, 129 BGA package, 0.5mm ball pitch