Description
WM8978CGEFL/V Cirrus Logic Stereo Audio Interface, Audio Codec 2ADC /2 DAC 24-Bit 32-Pin QFN
Product Attributes
Categories Integrated Circuits (ICs)
Interface – CODECs
Manufacturer Cirrus Logic Inc.
Type Stereo Audio
Data Interface I2S, PCM
Resolution (Bits) 24 b
Number of ADCs / DACs 2 / 2
Sigma Delta Yes
S/N Ratio, ADCs / DACs (db) Typ 95 / 98
Dynamic Range, ADCs / DACs (db) Typ –
Voltage – Supply, Analog 2.5 V ~ 3.6 V
Voltage – Supply, Digital 1.71 V ~ 3.6 V
Operating Temperature -40C ~ 100C
Mounting Type Surface Mount
Package / Case 32-VFQFN Exposed Pad
Supplier Device Package 32-QFN (5×5)
Manufacturer Part Number: WM8978CGEFL/V
The WM8978 is a low power, high quality stereo CODEC designed for portable applications such as multimedia phone, digital still camera or digital camcorder. The device integrates preamps for stereo differential mics, and includes drivers for speakers, headphone and differential or stereo line output. External component requirements are reduced as no separate microphone or headphone amplifiers are required. Advanced on-chip digital signal processing includes a 5-band equaliser, a mixed signal Automatic Level Control for the microphone or line input through the ADC as well as a purely digital limiter function for record or playback. Additional digital filtering options are available in the ADC path, to cater for application filtering such as ‘wind noise reduction’. The WM8978 digital audio interface can operate as a master or a slave. An internal PLL can generate all required audio clocks for the CODEC from common reference clock frequencies, such as 12MHz and 13MHz. The WM8978 operates at analogue supply voltages from 2.5V to 3.3V, although the digital core can operate at voltages down to 1.71V to save power. The speaker outputs and OUT3/4 line outputs can run from a 5V supply if increased output power is required. Individual sections of the chip can also be powered down under software control.
FEATURES
Stereo CODEC:
DAC SNR 98dB, THD -84dB (‘A’ weighted @ 48kHz)
ADC SNR 95dB, THD -84dB (‘A’ weighted @ 48kHz)
On-chip Headphone Driver with ‘capless’ option
– 40mW per channel into 16 / 3.3V SPKVDD
1W output power into 8 BTL speaker / 5V SPKVDD
– Capable of driving piezo speakers
– Stereo speaker drive configuration
Mic Preamps:
Stereo Differential or mono microphone Interfaces
– Programmable preamp gain
– Psuedo differential inputs with common mode
rejection
– Programmable ALC / Noise Gate in ADC path
Low-noise bias supplied for electret microphones
Other Features:
Enhanced 3-D function for improved stereo separation
Digital playback limiter
5-band Equaliser (record or playback)
Programmable ADC High Pass Filter (wind noise reduction)
Programmable ADC Notch Filter
Aux inputs for stereo analogue input signals or ‘beep’
On-chip PLL supporting 12, 13, 19.2MHz and other clocks
Support for 8, 11.025, 12, 16, 22.05, 24, 32, 44.1 and
48kHz sample rates
Low power, low voltage
– 2.5V to 3.6V (digital: 1.71V to 3.6V)
5x5mm 32-lead QFN package
APPLICATIONS
Stereo Camcorder or DSC
Multimedia Phone
