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WM8941, WM8941G, WM8941GEFL

Table of contents:
Info of WM8941
Info of WM8941G
Info of WM8941GEFL

WM8941, WM8941G, WM8941GEFL Selling Leads, Datasheet

MFG:WOLFSON Package Cooled:stock D/C:09+

WM8941, WM8941G, WM8941GEFL Datasheet download

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Part Number: WM8941

MFG: WOLFSON

Package Cooled: stock

D/C: 09+

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WM8941 General Description

The WM8941 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. A high performance, low power current-mode video buffer provides inherent short circuit protection.

An integrated video buffer is provided which has programmable gain from 0-6dB (6-12dB unloaded), sync-tip clamp and a 3rd order input low pass filter for signal reconstruction. 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 Alaw 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 WM8941 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. WM8941 is supplied in a very small 4x4mm QFN package, offering high levels of functionality in minimum board area, with high thermal performance.

WM8941 Maximum Ratings

CONDITION	MIN	MAX
DBVDD, DCVDD, AVDD, VBVDD, SPKVDD supply voltages	-0.3V	+4.2
Voltage range digital inputs	D_GND -0.3V¹	D_VDD +0.3V¹
Voltage range analogue inputs	A_GND -0.3V¹	A_VDD +0.3V¹
Operating temperature range, TA	-25	+85
Storage temperature prior to soldering	30 max / 85% RH max
Storage temperature after soldering	-65	+150

Notes
1. Analogue and digital grounds must always be within 0.3V of each other.
2. All digital and analogue supplies are completely independent from each other.

WM8941 Features

• 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 analog or 'Aux' inputs, plus analog 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
• Integrated video buffer with LPF and clamp.
• 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)
• 4x4x0.75mm 28 lead QFN package

WM8941 Typical Application

• Digital still cameras and camcorders
• General purpose mono audio CODEC with video buffer

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