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Hi-Fi and Telephony Dual CODEC
DESCRIPTION
The WM8753L is a low power, high quality stereo CODEC
with integrated Voice CODEC designed for portable digital
telephony applications such as mobile phone, or headset
with Hi-Fi playback capability.
The device integrates dual interfaces to two differentially
connected microphones, and includes drivers for speakers,
headphone and earpiece. External component requirements
are reduced as no separate microphone or headphone
amplifiers are required, and Cap-less connections can be
made to all loads. Advanced on-chip digital signal
processing performs tone control, Bass Boost and automatic
level control for the microphone or line input through the
ADC. The two ADCs may be used to support Voice noise
cancellation in a partnering DSP, or for stereo recording.
The WM8753L Hi-Fi DAC can operate as a master or a
slave, with various master clock frequencies including 12 or
24MHz for USB devices, 13MHz or 19.2MHz for cellular
systems, or standard 256fs rates like 12.288MHz and
24.576MHz. Internal PLLs generate all required clocks for
both Voice and Hi-Fi converters. If audio system clocks
already exist, the PLLs may be committed to alternative
uses.
The WM8753L operates at a nominal supply voltage of 2V,
although the digital core can operate at voltages down to
1.42V to save power, and the maximum for all supplies is 3.6
Volts. Different sections of the chip can also be powered
down under software control.
WM8753L
FEATURES
•
•
Hi-Fi DAC:
interfaced over I
2
S type link
Audio sample rates:
8, 11.025, 16, 22.05, 24, 32, 44.1, 48, 88.2, 96
•
DAC SNR 98dB, THD -84dB (‘A’ weighted @ 48kHz)
•
ADC SNR 95dB, THD -82dB (‘A’ weighted @ 48kHz)
•
On-chip Headphone Driver with cap-less output option
- 40mW output power on 16Ω / 3.3V
- with 16Ω load: SNR 90dB, THD –75dB
- with 10kΩ load: SNR 94dB, THD –90dB
•
On-chip speaker driver with 0.5W into 8R
•
Voice CODEC:
interfaced over Voice interface
•
supports sample rates from 8ks/s to 48ks/s
•
ADC and DAC SNR 82dB, THD -74dB
•
Two Differential Microphone Interfaces
- Dual ADCs support noise cancellation in external DSP
- Programmable ALC / Noise Gate
•
Low-noise bias supplied for electret microphones
Other Features
•
On-chip PLLs supporting 12, 13, 19.2MHz and other clocks
•
Cap-less connection options to headphones, earpiece, spkr.
•
Low power, low voltage
- 1.8V to 3.6V (digital core: 1.42V to 3.6V)
- power consumption <20mW all-on with 2V supplies
- <12mW for PCM CODEC operation
•
7x7x0.9mm QFN package, 5x5x0.9mm BGA package
APPLICATIONS
•
•
MP3 Player / Recorder mobile phone
Bluetooth stereo headset
WOLFSON MICROELECTRONICS plc
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Pre-Production, November 2005, Rev 3.4
Copyright
2005
Wolfson Microelectronics plc
WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
