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PDF WM8962 Data sheet ( Hoja de datos )
| Número de pieza | WM8962 | |
| Descripción | Ultra-Low Power Stereo CODEC | |
| Fabricantes | Wolfson Microelectronics | |
| Logotipo |  |
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WM8962
Ultra-Low Power Stereo CODEC with Audio Enhancement
DSP, 1W Stereo Class D Speaker Drivers and Ground
Referenced Headphone Drivers
DESCRIPTION
FEATURES
The WM8962 is a low power, high performance stereo CODEC
designed for portable digital audio applications.
An integrated charge pump provides a ground referenced output
which removes the need for DC-blocking capacitors on the
headphone outputs, and uses the Wolfson ‘Class-W’ amplifier
techniques - incorporating an innovative dual-mode charge
pump architecture - to optimise efficiency and power
consumption during playback. A DC Servo is used to reduce DC
ground offsets. This improves power consumption and
minimises pops and clicks.
Stereo class D speaker drivers provide 1W per channel into 8Ω
loads, or 2W mono into a 4Ω load, with a 5V supply. Low
leakage, excellent PSRR and pop/click suppression
mechanisms also allow direct battery connection to the speaker
supply. Flexible speaker boost settings allow speaker output
power to be maximised while minimising other analogue supply
currents.
Control sequences for audio path setup can be pre-loaded and
executed by an integrated sequencer to reduce software driver
development and eliminate pops and clicks via Wolfson’s
SilentSwitch™ technology.
Flexible input configuration: four stereo inputs or eight mono
inputs on Left or Right ADC, with a complete analogue (four
single-ended stereo inputs) and digital microphone interface.
External component requirements are drastically reduced as no
separate microphone, speaker or headphone amplifiers are
required. Advanced on-chip digital signal processing performs
automatic level control for the microphone or line input.
Stereo 24-bit sigma-delta ADCs and DACs are used with low
power over-sampling digital interpolation and decimation filters
and a flexible digital audio interface.
A programmable audio enhancement DSP is included with
multiple preset algorithms. Virtual Surround Sound widens the
stereo speaker audio image, HD Bass enhances low
frequencies, and ReTuneTM flattens the frequency response of
the speaker or microphone path. A configurable DSP includes
additional functions such as 3D widening for recording, a 5-band
parametric EQ and Dynamic Range Controller.
Two high performance PLLs and one Exact Fractional Synthesis
(EFS) FLL are integrated to enable the user to clock a full audio
system.
The WM8962 operates at analogue supply voltages down to
1.7V, although the digital supplies can operate at voltages down
to 1.62V to save power. The speaker supply can operate at up
to 5.5V. Unused functions can be disabled using software
control to save power.
The WM8962 is supplied in a very small W-CSP package, ideal
for use in hand-held and portable systems.
• DAC SNR 98dB (‘A’ weighted), THD -79dB at 48kHz, 1.8V
• ADC SNR 94dB (‘A’ weighted), THD -86dB at 48kHz, 1.8V
• Stereo Class D Speaker Driver
- 1W per channel into 8Ω BTL speakers
- 2W mono into 4Ω BTL speakers
- Flexible internal switching clock
• Wolfson ‘Class-W’ ultra-low power headphone driver
- Up to 22mW per channel output power at -80dB
THD+N into 16Ω at 1.8V
- Ground Referenced
- Low offset (+/- 1.5mV)
- Pop and click suppression
- Control sequencer for pop-minimised power-up/down
- Single register write for default start-up sequence
• Microphone Interface
- Single ended four stereo analogue input
- Integrated low noise MICBIAS
- Digital microphone interface
- Programmable ALC / Limiter and Noise Gate
• Programmable Audio Enhancement DSP with Presets
- Virtual Surround Sound
- HD Bass
- ReTuneTM
• Fixed Audio Processing DSP
- 3D stereo widening
- 5-band Parametric EQ
- Dynamic range controller
- Beep generator
• Two integrated PLLs enable clocking of full audio system
• Low Power Consumption
- 6.99mW headphone playback (1.8V supplies, Low
Power mode)
• Low Supply Voltages
- Analogue 1.7V to 2.0V (Speaker supply up to 5.5V)
- Charge pump 1.7V to 2.0V
- MIC bias amp supply 1.7V to 3.6V
- Digital 1.62V to 2.0V
• 2-wire I2C and 3- or 4-wire SPI serial control interface
• Standard sample rates from 8kHz to 96kHz
• W-CSP, 3.6x3.9mm 49-pin
APPLICATIONS
• Portable gaming
• Voice recorders
• Mobile multimedia
• Stereo DSC-Camcorder
WOLFSON MICROELECTRONICS plc
To receive regular email updates, sign up at http://www.wolfsonmicro.com/enews
Product Brief, July 2010, Rev 2.0
1
1 page  
Preliminary Technical Data
WM8962
ABSOLUTE MAXIMUM RATINGS
Absolute Maximum Ratings are stress ratings only. Permanent damage to the device may be caused by continuously operating at or
beyond these limits. Device functional operating limits and guaranteed performance specifications are given under Electrical
Characteristics at the test conditions specified.
ESD Sensitive Device. This device is manufactured on a CMOS process. It is therefore generically susceptible
to damage from excessive static voltages. Proper ESD precautions must be taken during handling and storage
of this device.
Wolfson tests its package types according to IPC/JEDEC J-STD-020B for Moisture Sensitivity to determine acceptable storage
conditions prior to surface mount assembly. These levels are:
MSL1 = unlimited floor life at <30°C / 85% Relative Humidity. Not normally stored in moisture barrier bag.
MSL2 = out of bag storage for 1 year at <30°C / 60% Relative Humidity. Supplied in moisture barrier bag.
MSL3 = out of bag storage for 168 hours at <30°C / 60% Relative Humidity. Supplied in moisture barrier bag.
The Moisture Sensitivity Level for each package type is specified in Ordering Information.
CONDITION
MIN MAX
DCVDD, AVDD, PLLVDD
-0.3V
+2.5V
MICVDD and DBVDD
-0.3V
+4.5V
SPKVDD1, SPKVDD2
-0.3V
+7.0V
CPVDD
-0.3V
+2.2V
Voltage range digital inputs
DGND -0.3V
DBVDD +0.3V
Voltage range analogue inputs
AGND -0.3V
AVDD +0.3V
Voltage range analogue outputs (HPOUTL, HPOUTR)
-CPVDD-0.3V
+CPVDD+0.3V
Temperature Range, TA
Junction Temperature, TJMAX
Storage temperature after soldering
-40°C
-40°C
-65°C
+85°C
+150°C
+150°C
Notes:
1. Analogue, digital and speaker grounds must always be within 0.3V of each other.
2. All digital and analogue supplies are completely independent from each other (i.e. not internally connected).
3. AVDD must be less than or equal to MICVDD.
4. AVDD must be less than or equal to SPKVDD1 and SPKVDD2.
RECOMMENDED OPERATING CONDITIONS
PARAMETER
SYMBOL
MIN TYP MAX UNIT
Digital core supply range
DCVDD
1.62 1.8
2.0
V
Digital buffer supply range
DBVDD
1.62 1.8
3.6
V
Microphone bias supply range
MICVDD
1.7 2.5 3.6
V
Analogue supplies range
AVDD
1.7 1.8 2.0
V
PLL supply range
PLLVDD
1.7 1.8 2.0
V
Charge pump supply range (1.8V
supply operation)
CPVDD
1.7 1.8 2.0
V
Speaker supply range
SPKVDD1, SPKVDD2
1.7
5.0
5.5
V
Ground
DGND, AGND, CPGND,
SPKGND1, SPKGND2,
PLLGND
0
V
Notes:
1. SPKVDD1 and SPKVDD2 must be high enough to support the peak output voltage when using CLASSD_VOL function, to
avoid output waveform clipping. Peak output voltage is AVDD*CLASSD_VOL.
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Product Brief, July 2010, Rev 2.0
5
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet WM8962.PDF ] | |
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