WM8941GEFL/V

WM8941GEFL/V Datasheet

WM8941

Part	Datasheet
WM8941GEFL/V	WM8941GEFL/V (pdf)

Related Parts	Information
WM8941GEFL/RV	WM8941GEFL/RV

PDF Datasheet Preview
WM8941 Mono CODEC with Speaker Driver and Video Buffer 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 A-law and ulaw 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 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. • Mono CODEC • Audio sample rates:8, 16, 24, 32, 48kHz • DAC SNR 98dB, THD -80dB ‘A’-weighted 8 48ks/s • ADC SNR 91dB, THD -83dB ‘A’-weighted 8 48ks/s • On-chip Headphone/Speaker Driver - 40mW output power into 16Ω - BTL speaker drive 0.4W into 8Ω • 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 • Digital still cameras and camcorders • General purpose mono audio CODEC with video buffer WOLFSON MICROELECTRONICS plc To receive regular email updates, sign up at WM8941 BLOCK DIAGRAM Production Data Production Data WM8941 TABLE OF CONTENTS 1 FEATURES 1 BLOCK DIAGRAM 2 PIN CONFIGURATION 5 ORDERING 5 PIN 6 ABSOLUTE MAXIMUM RATINGS 7 RECOMMENDED OPERATING 7 ELECTRICAL CHARACTERISTICS 8 TERMINOLOGY 10 AUDIO PATHS OVERVIEW 11 SIGNAL TIMING REQUIREMENTS 13 SYSTEM CLOCK TIMING 13 AUDIO INTERFACE TIMING MASTER 13 AUDIO INTERFACE TIMING SLAVE MODE 14 CONTROL INTERFACE TIMING 3-WIRE MODE 15 CONTROL INTERFACE TIMING 2-WIRE MODE 16 DEVICE DESCRIPTION 17 INTRODUCTION 17 INPUT SIGNAL PATH 18 ANALOGUE TO DIGITAL CONVERTER ADC 24 INPUT LIMITER / AUTOMATIC LEVEL CONTROL 29 OUTPUT SIGNAL PATH 42 VOLUME BOOST 44 ANALOGUE 46 OUTPUT 49 VIDEO BUFFER 52 DIGITAL AUDIO 57 AUDIO SAMPLE 61 MASTER CLOCK AND PHASE LOCKED LOOP PLL 62 COMPANDING 65 GENERAL PURPOSE 67 CONTROL 67 3-WIRE SERIAL CONTROL MODE 69 READBACK IN 3-WIRE MODE 69 2-WIRE SERIAL CONTROL MODE 70 RESETTING THE CHIP 70 POWER MANAGEMENT 73 POP MINIMISATION REGISTER MAP 75 REGISTER BITS BY ADDRESS 76 DIGITAL FILTER CHARACTERISTICS 87 TERMINOLOGY 87 DAC FILTER RESPONSES 88 ADC FILTER RESPONSES 88 HIGHPASS 89 NOTCH FILTERS AND LOW PASS 90 APPLICATIONS INFORMATION 92 WM8941 Production Data RECOMMENDED EXTERNAL COMPONENTS 92 PACKAGE DIAGRAM 93 IMPORTANT NOTICE 94 ADDRESS 94 Production Data PIN CONFIGURATION WM8941 SPKGND 22 SPKROUTN 23 SPKVDD 24 AUX 25 VMID 26 MICN 27 MICP 28 21 20 19 18 17 16 15 14 SCLK 13 MODE / GPIO 12 CSB / GPIO 11 MCLK 10 BCLK 9 FRAME 8 DACDAT ORDERING INFORMATION ORDER CODE WM8941GEFL/V TEMPERATURE RANGE -25°C to +85°C WM8941GEFL/RV -25°C to +85°C Note Reel Quantity = 3,500 PACKAGE 28-lead QFN 4x4x0.75mm Pb-free 28-lead QFN 4x4x0.75mm Pb-free, tape and reel MOISTURE SENSITIVITY LEVEL MSL3 MSL3 PACKAGE BODY TEMPERATURE 260oC 260oC WM8941 PIN DESCRIPTION NAME TYPE MICBIAS Analogue Output AVDD Supply AGND Supply DCVDD Supply DBVDD Supply DGND Supply ADCDAT Digital Output DACDAT Digital Input FRAME Digital Input / Output BCLK Digital Input / Output MCLK Digital Input CSB/GPIO Digital Input / Output MODE/GPIO Digital Input SCLK The Moisture Sensitivity Level for each package type is specified in Ordering Information. CONDITION DBVDD, DCVDD, AVDD, VBVDD, SPKVDD supply voltages Voltage range digital inputs Voltage range analogue inputs Operating temperature range, TA Storage temperature prior to soldering Storage temperature after soldering -0.3V DGND -0.3V1 AGND -0.3V1 DVDD +0.3V1 AVDD +0.3V1 -25°C +85°C 30°C max / 85% RH max -65°C +150°C Notes Analogue and digital grounds must always be within 0.3V of each other. All digital and analogue supplies are completely independent from each other. RECOMMENDED OPERATING CONDITIONS PARAMETER Digital supply range Core Digital supply voltage Buffer Analogue supplies range Ground SYMBOL DCVDD DBVDD AVDD, SPKVDD, VBVDD1 DGND,AGND, SPKGND TEST CONDITIONS Notes Analogue supply voltages must not be less than the digital supply voltages. DBVDD must be DCVDD UNIT WM8941 Production Data ELECTRICAL CHARACTERISTICS Test Conditions DCVDD=1.8V, DBVDD=3.3V, AVDD=3.3V, SPKVDD =3.3V, , VBVDD=3.3V, TA = +25oC, 1kHz signal, fs = 48kHz, 24-bit audio data unless otherwise stated. PARAMETER TEST CONDITIONS UNIT Microphone Input PGA Inputs MICN, MICP INPPGAVOL and PGABOOST = 0dB Full-scale Input Signal Level Singleended input via LIN/RIN 1 AVDD/3.3 Vrms Full-scale Input Signal Level Pseudo-differential input 1,2 AVDD*0.7/ Vrms Input PGA equivalent input noise INPPGAVOL = +35.25dB No input signal 0 to 20kHz MICN input resistance INPPGAVOL = +35.25dB

PDF Datasheet Preview

WM8941

Mono CODEC with Speaker Driver and Video Buffer

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 A-law and ulaw 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 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.
• Mono CODEC
• Audio sample rates:8, 16, 24, 32, 48kHz
• DAC SNR 98dB, THD -80dB ‘A’-weighted 8 48ks/s
• ADC SNR 91dB, THD -83dB ‘A’-weighted 8 48ks/s
• On-chip Headphone/Speaker Driver
- 40mW output power into 16Ω - BTL speaker drive 0.4W into 8Ω
• 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
• Digital still cameras and camcorders
• General purpose mono audio CODEC with video buffer

WOLFSON MICROELECTRONICS plc To receive regular email updates, sign up at

WM8941 BLOCK DIAGRAM

Production Data

Production Data

WM8941
TABLE OF CONTENTS 1 FEATURES 1 BLOCK DIAGRAM 2 PIN CONFIGURATION 5 ORDERING 5 PIN 6 ABSOLUTE MAXIMUM RATINGS 7 RECOMMENDED OPERATING 7 ELECTRICAL CHARACTERISTICS 8

TERMINOLOGY 10 AUDIO PATHS OVERVIEW 11 SIGNAL TIMING REQUIREMENTS 13

SYSTEM CLOCK TIMING 13 AUDIO INTERFACE TIMING MASTER 13 AUDIO INTERFACE TIMING SLAVE MODE 14 CONTROL INTERFACE TIMING 3-WIRE MODE 15 CONTROL INTERFACE TIMING 2-WIRE MODE 16 DEVICE DESCRIPTION 17 INTRODUCTION 17 INPUT SIGNAL PATH 18 ANALOGUE TO DIGITAL CONVERTER ADC 24 INPUT LIMITER / AUTOMATIC LEVEL CONTROL 29 OUTPUT SIGNAL PATH 42 VOLUME BOOST 44 ANALOGUE 46 OUTPUT 49 VIDEO BUFFER 52 DIGITAL AUDIO 57 AUDIO SAMPLE 61 MASTER CLOCK AND PHASE LOCKED LOOP PLL 62 COMPANDING 65 GENERAL PURPOSE 67 CONTROL 67 3-WIRE SERIAL CONTROL MODE 69 READBACK IN 3-WIRE MODE 69 2-WIRE SERIAL CONTROL MODE 70 RESETTING THE CHIP 70 POWER MANAGEMENT 73 POP MINIMISATION REGISTER MAP 75 REGISTER BITS BY ADDRESS 76 DIGITAL FILTER CHARACTERISTICS 87 TERMINOLOGY 87 DAC FILTER RESPONSES 88 ADC FILTER RESPONSES 88 HIGHPASS 89 NOTCH FILTERS AND LOW PASS 90 APPLICATIONS INFORMATION 92

WM8941

Production Data

RECOMMENDED EXTERNAL COMPONENTS 92

PACKAGE DIAGRAM 93

IMPORTANT NOTICE 94

ADDRESS 94

Production Data

PIN CONFIGURATION

WM8941

SPKGND 22 SPKROUTN 23

SPKVDD 24 AUX 25

VMID 26 MICN 27 MICP 28
21 20 19 18 17 16 15
14 SCLK
13 MODE / GPIO
12 CSB / GPIO
11 MCLK
10 BCLK
9 FRAME
8 DACDAT
ORDERING INFORMATION

ORDER CODE WM8941GEFL/V

TEMPERATURE RANGE
-25°C to +85°C

WM8941GEFL/RV
-25°C to +85°C

Note Reel Quantity = 3,500

PACKAGE
28-lead QFN 4x4x0.75mm Pb-free
28-lead QFN 4x4x0.75mm Pb-free, tape and reel

MOISTURE SENSITIVITY LEVEL MSL3

MSL3

PACKAGE BODY TEMPERATURE
260oC
260oC

WM8941

PIN DESCRIPTION

NAME

TYPE

MICBIAS Analogue Output

AVDD

Supply

AGND

Supply

DCVDD

Supply

DBVDD

Supply

DGND

Supply

ADCDAT Digital Output

DACDAT Digital Input

FRAME

Digital Input / Output

BCLK

Digital Input / Output

MCLK

Digital Input

CSB/GPIO Digital Input / Output

MODE/GPIO Digital Input

SCLK
The Moisture Sensitivity Level for each package type is specified in Ordering Information.

CONDITION

DBVDD, DCVDD, AVDD, VBVDD, SPKVDD supply voltages Voltage range digital inputs Voltage range analogue inputs Operating temperature range, TA Storage temperature prior to soldering Storage temperature after soldering
-0.3V

DGND -0.3V1 AGND -0.3V1

DVDD +0.3V1 AVDD +0.3V1
-25°C
+85°C
30°C max / 85% RH max
-65°C
+150°C

Notes

Analogue and digital grounds must always be within 0.3V of each other.

All digital and analogue supplies are completely independent from each other.

RECOMMENDED OPERATING CONDITIONS

PARAMETER Digital supply range Core Digital supply voltage Buffer Analogue supplies range Ground

SYMBOL DCVDD DBVDD AVDD, SPKVDD, VBVDD1 DGND,AGND, SPKGND

TEST CONDITIONS

Notes Analogue supply voltages must not be less than the digital supply voltages. DBVDD must be DCVDD

UNIT

WM8941

Production Data

ELECTRICAL CHARACTERISTICS

Test Conditions DCVDD=1.8V, DBVDD=3.3V, AVDD=3.3V, SPKVDD =3.3V, , VBVDD=3.3V, TA = +25oC, 1kHz signal, fs = 48kHz, 24-bit audio data unless otherwise stated.

PARAMETER

TEST CONDITIONS

UNIT

Microphone Input PGA Inputs MICN, MICP

INPPGAVOL and PGABOOST = 0dB

Full-scale Input Signal Level Singleended input via LIN/RIN 1

AVDD/3.3

Vrms

Full-scale Input Signal Level Pseudo-differential input 1,2

AVDD*0.7/

Vrms

Input PGA equivalent input noise

INPPGAVOL = +35.25dB

No input signal
0 to 20kHz

MICN input resistance

INPPGAVOL = +35.25dB

Notice: we do not provide any warranties that information, datasheets, application notes, circuit diagrams, or software stored on this website are up-to-date or error free. The archived WM8941GEFL/V Datasheet file may be downloaded here without warranties.

Datasheet ID: WM8941GEFL/V 523280