The WM8974CGEFL/RV is a low power, mono codec with integrated support for a differential or single ended mic, and includes drivers for speakers or headphone, as well as the mono line output. Separate microphone and headphone amplifiers are not required, and advanced Delta-Sigma converters are used along with digital decimation and interpolation filters to give high quality audio at sample rates from 8 to 48 ks/s. Additional digital filtering options are available in the ADC path to provide application filtering such as 'wind noise reduction'. An advanced mixed-signal ALC function with noise gate also is provided. An on-chip PLL is provided to generate the required Master Clock from an external reference clock. The PLL clock can also be output if required elsewhere in the system. Different sections of the chip can also be powered down under software control by way of the selectable two or three wire control interface.
Feature
Mono codec
Audio sample rates:8, 11.025, 16, 22.05, 24, 32, 44.1, 48 kHz
DAC SNR 98 dB, THD -84 dB (‘A’-weighted @ 8 – 48ks/s)
ADC SNR 94 dB, THD -83 dB (‘A’-weighted @ 8 – 48ks/s)
On-chip headphone/speaker driver with ‘cap-less’ connect
Additional mono line output
Multiple analog or ‘Aux’ inputs, plus analog bypass path
Mic preamps
Differential or single-ended microphone interface
Low-noise bias supplied for electret microphones
5 band EQ (record or playback path)
Digital playback limiter
Programmable ADC high pass filter (wind noise reduction)
Programmable ADC Notch Filter
On-chip PLL
Low power, low voltage
4x4x0.9mm 24 lead QFN package
Catalogue
FPGA / CPLD
Memory
MOS 
MCU 
DSP
OCEP
Secondary 
Other 
