WM2002GEFL

WM2002GEFL Datasheet

WM2002

Part	Datasheet
WM2002GEFL	WM2002GEFL (pdf)

PDF Datasheet Preview
WM2002 Stereo Headphone Driver with Wolfson Ambient Noise Cancellation The WM2002 is a low power, high quality stereo headphone • driver, delivering Wolfson’s patented ambient noise cancellation. The WM2002 supports analogue playback or voice input, and analogue microphones for noise cancellation. Designed for incorporation within a stand-alone headset or headphone, the Wolfson ANC noise cancellation engine performs ambient noise cancellation during a voice call or during • music playback. The WM2002 provides integrated power management, comprising a DC-DC converter, Charge Pump and LDO • Regulators. Different power supply configurations can be supported, including operation from a single cell AAA or AA battery, and other configurations using externally regulated supplies. System clocking is achieved using a crystal-controlled on-chip • oscillator. An external clock can be connected directly, if available. The WM2002 is configured using programmable settings stored in an integrated non-volatile memory. The configuration stored in the OTP memory is enabled automatically at start-up. If • required, the WM2002 can also be configured using register control accessed using a 2-wire serial control interface. Wolfson Ambient Noise Cancellation ANC - >30dB peak , 25dB typical ambient noise reduction* - Wide noise cancellation bandwidth 40Hz to 4kHz * - * depending on acoustic configuration - Up to 3 banks of ANC coefficients can be programmed to support different operating conditions Audio inputs - Up to 10 analogue noise cancellation microphones - 2 single-ended or 1 differential line input per channel Headphone driver LDO4VOUT = 1.8V - 45mW per channel into load - 22mW per channel into load - Single-ended or differential BTL drive configuration - -82dB THD+N for differential BTL drive Integration - On-chip DC-DC boost converter, charge-pump and LDOs - Flexible power supply options, including single cell battery 1 x AAA battery - Internal crystal oscillator Miscellaneous - Monitor pin to select mute / talk-through modes - LED driver - Tone generator for audible status indication - Pop and click noise protection circuit - RFI suppression - 48-pin QFN package 7 x 7 x 0.75mm, 0.5mm pitch • “Pod-style” stereo ear-buds, headsets, headphones with ANC • “Supra-Aural” stereo headphones with ANC • Mono/Stereo Bluetooth headsets with ANC WOLFSON MICROELECTRONICS plc WM2002 BLOCK DIAGRAM PIN CONFIGURATION WM2002 ORDERING INFORMATION DEVICE WM2002GEFL/V WM2002GEFL/RV Note Reel quantity = 2,200 TEMPERATURE RANGE -40oC to +85oC -40oC to +85oC PACKAGE 48-pin QFN Pb-free 48-pin QFN Pb-free, tape and reel MOISTURE SENSITIVITY LEVEL MSL3 MSL3 PEAK SOLDERING TEMPERATURE 260oC WM2002 PIN DESCRIPTION A description of each pin on the WM2002 is provided below. Note that, where multiple pins share a common name eg. DGND , these pins should be tied together on the PCB. NAME TYPE Analogue Output Status LED output DGND Supply Digital supplies ground Digital Input Digital control input changes ANC filter characteristics, selects mute or talk-through mode ADDR Digital Input Control interface address select Digital Input/Output Control interface data input / output SCLK Digital Input Control interface clock input LDO1VDD Supply LDO1 supply input LDO1VOUT Analogue Output / LDO1 output / Digital core supply Supply The Moisture Sensitivity Level for each package type is specified in “Ordering Information”. CONDITION BATTVDD SYSVDD, MICVDD, LDO1VDD, DBVDD PROGVDD Voltage range digital inputs Voltage range analogue inputs Operating temperature range, TA Storage temperature after soldering MIN -0.3V -0.3V -0.3V DGND - 0.3V AGND - 0.3V -40ºC -65ºC MAX +1.8V +3.6V +6.75V DBVDD + 0.3V LDO3VOUT + 0.25V +85ºC +150ºC WM2002 RECOMMENDED OPERATING CONDITIONS PARAMETER UNIT DC Boost converter input BATTVDD see Note 5 Digital buffer supply DBVDD MICBIAS supply see Note 4 MICVDD Digital core supply LDO1 LDO1VDD System supply SYSVDD LDO2, LDO3 and LDO4 OTP Memory programming supply see Note 3 PROGVDD Ground DGND, AGND, CPGND, HPGND Analogue and digital grounds must always be within 0.3V of each other. All supplies are completely independent from each other i.e. not internally connected . The OTP Memory programming supply PROGVDD should only be present when programming the OTP. At other times, this pin should be tied to DGND. MICVDD must be at least 300mV higher than the selected MICBIAS output voltage. When the Charge Pump is enabled, the maximum BATTVDD voltage will depend on the programmable voltage DC1VOUT. The combined voltage BATTVDD + DC1VOUT must not exceed 3.6V. A typical application circuit is illustrated in Figure 1, showing the line inputs, ANC microphone inputs, and stereo headphone output. Figure 1 Typical Application WOLFSON AMBIENT NOISE CANCELLATION ANC WM2002 The Wolfson ANC engine within the WM2002 improves the intelligibility of a voice call by using destructive interference to reduce the acoustic energy of the ambient sound. The ANC engine is configured using parameters that are determined during product development and programmed on integrated OTP memory. The configuration settings are specific to the acoustic properties of the target application. The primary acoustic elements in an application are typically the microphones and the speaker, but other components such as the plastics and the PCBs also have significant importance to the acoustic coefficient data. Note that the WM2002 configuration parameters are determined during development and are programmed in the OTP memory during production calibration. These parameters are applicationspecific, and must be recalculated following any change in the design of the acoustic elements of that application. Any mismatch between the acoustic coefficient data and the target application will give inferior ANC performance. The ANC engine employs digital circuits to process the ambient noise microphone signals these inputs are digitized by two Analogue to Digital Converters ADCs , then filtered and processed in accordance with the acoustic parameters programmed into the WM2002. The noise cancellation signals are then output via two Digital to Analogue Converters DACs and mixed with the received voice or audio playback line signals. The ANC engine can support multiple noise cancellation filter coefficients, to enable best performance under different ambient noise conditions and different audio playback conditions. Other user-selectable options are also available, such as mute or talk-through modes. A high pass filter provides rejection of wind noise and other low frequency signals .Noise cancellation is applied selectively to different audio frequency bands. A configurable low frequency limiter protects the loudspeaker from excessive signal levels, and ensures that the ANC algorithms deliver noise reduction in the most sensitive frequency bands, without introducing distortion in other frequency bands. The ANC engine is adaptive to different ambient noise levels in order to provide the most natural sound at the headphone audio output. The integrated noise gate automatically mutes the noise cancelling input at low ambient noise levels this ensures that the noise cancellation performance is optimised across a wide range of input signal conditions. The noise gate threshold level, attack time and decay time are all configurable.

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WM2002

Stereo Headphone Driver with Wolfson Ambient Noise Cancellation

The WM2002 is a low power, high quality stereo headphone
• driver, delivering Wolfson’s patented ambient noise cancellation. The WM2002 supports analogue playback or voice input, and analogue microphones for noise cancellation.

Designed for incorporation within a stand-alone headset or headphone, the Wolfson ANC noise cancellation engine performs ambient noise cancellation during a voice call or during
• music playback.

The WM2002 provides integrated power management, comprising a DC-DC converter, Charge Pump and LDO
• Regulators. Different power supply configurations can be supported, including operation from a single cell AAA or AA battery, and other configurations using externally regulated supplies.

System clocking is achieved using a crystal-controlled on-chip
• oscillator. An external clock can be connected directly, if available.

The WM2002 is configured using programmable settings stored in an integrated non-volatile memory. The configuration stored in the OTP memory is enabled automatically at start-up. If
• required, the WM2002 can also be configured using register control accessed using a 2-wire serial control interface.

Wolfson Ambient Noise Cancellation ANC - >30dB peak , 25dB typical ambient noise reduction* - Wide noise cancellation bandwidth 40Hz to 4kHz * - * depending on acoustic configuration - Up to 3 banks of ANC coefficients can be programmed to
support different operating conditions

Audio inputs - Up to 10 analogue noise cancellation microphones - 2 single-ended or 1 differential line input per channel

Headphone driver LDO4VOUT = 1.8V - 45mW per channel into load - 22mW per channel into load - Single-ended or differential BTL drive configuration - -82dB THD+N for differential BTL drive

Integration - On-chip DC-DC boost converter, charge-pump and LDOs - Flexible power supply options, including single cell battery
1 x AAA battery - Internal crystal oscillator

Miscellaneous - Monitor pin to select mute / talk-through modes - LED driver - Tone generator for audible status indication - Pop and click noise protection circuit - RFI suppression - 48-pin QFN package 7 x 7 x 0.75mm, 0.5mm pitch
• “Pod-style” stereo ear-buds, headsets, headphones with ANC
• “Supra-Aural” stereo headphones with ANC
• Mono/Stereo Bluetooth headsets with ANC

WOLFSON MICROELECTRONICS plc

WM2002 BLOCK DIAGRAM

PIN CONFIGURATION

WM2002
ORDERING INFORMATION

DEVICE

WM2002GEFL/V WM2002GEFL/RV Note Reel quantity = 2,200

TEMPERATURE RANGE
-40oC to +85oC
-40oC to +85oC

PACKAGE
48-pin QFN Pb-free
48-pin QFN Pb-free, tape and reel

MOISTURE SENSITIVITY

LEVEL

MSL3

MSL3

PEAK SOLDERING TEMPERATURE
260oC

WM2002

PIN DESCRIPTION

A description of each pin on the WM2002 is provided below.

Note that, where multiple pins share a common name eg. DGND , these pins should be tied together on the PCB.

NAME

TYPE

Analogue Output

Status LED output

DGND

Supply

Digital supplies ground

Digital Input

Digital control input changes ANC filter characteristics, selects mute or talk-through mode

ADDR

Digital Input

Control interface address select

Digital Input/Output Control interface data input / output

SCLK

Digital Input

Control interface clock input

LDO1VDD

Supply

LDO1 supply input

LDO1VOUT

Analogue Output / LDO1 output / Digital core supply

Supply
The Moisture Sensitivity Level for each package type is specified in “Ordering Information”.

CONDITION BATTVDD SYSVDD, MICVDD, LDO1VDD, DBVDD PROGVDD Voltage range digital inputs Voltage range analogue inputs Operating temperature range, TA Storage temperature after soldering

MIN -0.3V -0.3V -0.3V DGND - 0.3V AGND - 0.3V -40ºC -65ºC

MAX +1.8V +3.6V +6.75V DBVDD + 0.3V LDO3VOUT + 0.25V +85ºC +150ºC

WM2002

RECOMMENDED OPERATING CONDITIONS

PARAMETER

UNIT

DC Boost converter input

BATTVDD
see Note 5

Digital buffer supply

DBVDD

MICBIAS supply see Note 4

MICVDD

Digital core supply LDO1

LDO1VDD

System supply

SYSVDD

LDO2, LDO3 and LDO4

OTP Memory programming supply see Note 3

PROGVDD

Ground

DGND, AGND, CPGND,

HPGND

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

All supplies are completely independent from each other i.e. not internally connected .

The OTP Memory programming supply PROGVDD should only be present when programming the OTP. At other times, this pin should be tied to DGND.

MICVDD must be at least 300mV higher than the selected MICBIAS output voltage.

When the Charge Pump is enabled, the maximum BATTVDD voltage will depend on the programmable voltage DC1VOUT. The combined voltage BATTVDD + DC1VOUT must not exceed 3.6V.

A typical application circuit is illustrated in Figure 1, showing the line inputs, ANC microphone inputs, and stereo headphone output.

Figure 1 Typical Application

WOLFSON AMBIENT NOISE CANCELLATION ANC

WM2002

The Wolfson ANC engine within the WM2002 improves the intelligibility of a voice call by using destructive interference to reduce the acoustic energy of the ambient sound.

The ANC engine is configured using parameters that are determined during product development and programmed on integrated OTP memory. The configuration settings are specific to the acoustic properties of the target application. The primary acoustic elements in an application are typically the microphones and the speaker, but other components such as the plastics and the PCBs also have significant importance to the acoustic coefficient data.

Note that the WM2002 configuration parameters are determined during development and are programmed in the OTP memory during production calibration. These parameters are applicationspecific, and must be recalculated following any change in the design of the acoustic elements of that application. Any mismatch between the acoustic coefficient data and the target application will give inferior ANC performance.

The ANC engine employs digital circuits to process the ambient noise microphone signals these inputs are digitized by two Analogue to Digital Converters ADCs , then filtered and processed in accordance with the acoustic parameters programmed into the WM2002. The noise cancellation signals are then output via two Digital to Analogue Converters DACs and mixed with the received voice or audio playback line signals.

The ANC engine can support multiple noise cancellation filter coefficients, to enable best performance under different ambient noise conditions and different audio playback conditions. Other user-selectable options are also available, such as mute or talk-through modes.

A high pass filter provides rejection of wind noise and other low frequency signals .Noise cancellation is applied selectively to different audio frequency bands. A configurable low frequency limiter protects the loudspeaker from excessive signal levels, and ensures that the ANC algorithms deliver noise reduction in the most sensitive frequency bands, without introducing distortion in other frequency bands.

The ANC engine is adaptive to different ambient noise levels in order to provide the most natural sound at the headphone audio output. The integrated noise gate automatically mutes the noise cancelling input at low ambient noise levels this ensures that the noise cancellation performance is optimised across a wide range of input signal conditions. The noise gate threshold level, attack time and decay time are all configurable.

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 WM2002GEFL Datasheet file may be downloaded here without warranties.

Datasheet ID: WM2002GEFL 523261