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PDF WM8940 Data sheet ( Hoja de datos )
| Número de pieza | WM8940 | |
| Descripción | Mono CODEC | |
| Fabricantes | Wolfson Microelectronics | |
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WM8940
Mono CODEC with Speaker Driver
DESCRIPTION
The WM8940 is a low power, high quality mono CODEC
designed for portable applications such as digital still cameras
or camcorders.
The device integrates support for a differential or single ended
mic, and includes drivers for speakers or headphone, and
mono line output. External component requirements are
reduced as no separate microphone or headphone amplifiers
are required.
Advanced Sigma Delta Converters are used along with digital
decimation and interpolation filters to give high quality audio at
sample rates from 8 to 48ks/s. A selectable high pass filter and
four fully-programmable notch filters are available in the ADC
path. An advanced mixed signal ALC function with noise gate
is provided, while readback of PGA gain during ALC operation
is supported. The digital audio interface supports A-law and -
law companding.
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.
The WM8940 operates at supply voltages from 2.5 to 3.6V,
although the digital supplies can operate at voltages down to
1.71V to save power. Different sections of the chip can also be
powered down under software control using the selectable two
or three wire control interface.
WM8940 is supplied in a very small 4x4mm QFN package,
offering high levels of functionality in minimum board area, with
high thermal performance.
FEATURES
Mono CODEC:
Audio sample rates:8, 11.025, 16, 22.05, 24, 32, 44.1, 48kHz
DAC SNR 98dB, THD -84dB (‘A’-weighted @ 8 – 48ks/s)
ADC SNR 94dB, THD -80dB (‘A’-weighted @ 8 – 48ks/s)
On-chip Headphone/Speaker Driver
- 40mW output power into 16
- BTL speaker drive 0.4W into 8
Additional MONO Line output
Multiple analogue or ‘Aux’ inputs, plus analogue bypass path
Mic Preamps:
Differential or single end Microphone Interface
- Programmable preamp gain
- Pseudo differential inputs with common mode rejection
- Programmable ALC / Noise Gate in ADC path
Low-noise bias supplied for electret microphones
OTHER FEATURES
Digital Playback Limiter
Programmable high pass filter (wind noise reduction)
4 notch filters (narrowband noise suppression)
On-chip PLL
Low power, low voltage
- 2.5V to 3.6V (digital: 1.71V to 3.6V)
4x4x0.9mm 24 lead QFN package
APPLICATIONS
Digital still cameras and camcorders
General purpose mono audio CODEC
WOLFSON MICROELECTRONICS plc
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Production Data, Rev 4.3, November 2011
Copyright 2011 Wolfson Microelectronics plc
1 page  
Production Data
PIN CONFIGURATION
WM8940
TOP VIEW
ORDERING INFORMATION
ORDER CODE
WM8940CGEFL/V
TEMPERATURE
RANGE
-25C to +85C
WM8940CGEFL/RV
-25C to +85C
Note:
Reel Quantity = 3,500
PACKAGE
24-lead QFN (4x4x0.9mm)
(Pb-free)
24-lead QFN (4x4x0.9mm)
(Pb-free, tape and reel)
MOISTURE SENSITIVITY
LEVEL
MSL3
MSL3
PACKAGE BODY
TEMPERATURE
260oC
260oC
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PD, Rev 4.3, November 2011
5
5 Page 
Production Data
AUDIO PATHS OVERVIEW
WM8940
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PD, Rev 4.3, November 2011
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet WM8940.PDF ] | |
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