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WM8961 Schematic ( PDF Datasheet ) - Wolfson Microelectronics

Teilenummer WM8961
Beschreibung Ultra-Low Power Stereo CODEC
Hersteller Wolfson Microelectronics
Logo Wolfson Microelectronics Logo 




Gesamt 30 Seiten
WM8961 Datasheet, Funktion
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WM8961
Ultra-Low Power Stereo CODEC with 1W Stereo Class D
Speaker Drivers and Ground Referenced Headphone Drivers
DESCRIPTION
FEATURES
The WM8961 is a low power, high quality 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
output, 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 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 : a stereo input or two mono inputs
on Lch or Rch ADC, with a complete 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.
The WM8961 operates at analogue supply voltages down to
1.71V, 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, providing 1W per channel into 8Ω loads. Unused
functions can be disabled using software control to save power.
The WM8961 is supplied in a very small and thin 5x5mm QFN
package, ideal for use in hand-held and portable systems.
DAC SNR 98dB (‘A’ weighted), THD -83dB at 48kHz, 1.8V
ADC SNR 88dB (‘A’ weighted), THD -75dB at 48kHz, 1.8V
Stereo Class D Speaker Driver
- 1W per channel into 8Ω 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 start-up and
shut-down
- Single register write for default start-up sequence
Microphone Interface
- Single ended stereo input
- Integrated low noise MICBIAS
- Programmable ALC / Limiter and Noise Gate
Low Power Consumption
- 6.99mW headphone playback (1.8V supplies, Low
Power mode)
Low Supply Voltages
- Analogue 1.71V to 2.0V (Speaker supply up to 5.5V)
- Charge pump 1.71V to 2.0V
- MIC bias amp supply 1.71V to 3.6V
- Digital 1.62V to 2.0V
2-wire serial control interface including read-back
Sample rates: 8, 11.025, 12, 16, 22.05, 24, 32, 44.1, 48
5x5x0.9mm 32 pin QFN package
APPLICATIONS
Games consoles
Portable media / DVD players
Mobile multimedia
WOLFSON MICROELECTRONICS plc
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Pre-Production, August 2009, Rev 3.1
Copyright ©2009 Wolfson Microelectronics plc






WM8961 Datasheet, Funktion
WM8961
Pre-Production
PIN DESCRIPTION
PIN NO
1
NAME
VNEG
2 CFB2
3 CFB1
4 CPGND
5 CPVDD
6 MICBIAS
7 RINPUT
8 LINPUT
9 MICVDD
10 DVDD
11 DGND
12 BCLK
13 LRC
14 DACDAT
15 MCLK
16 ADCDAT
17 SCLK
18 SDIN
19 SPK_RN
20 SPKGND2
21 SPKVDD2
22 SPK_RP
23 SPK_LN
24 SPKGND1
25 SPK_LP
26 SPKVDD1
27 VMID
28 AGND
29 AVDD
30 HP_R
31 HP_L
32 VPOS
GND_PADDLE
TYPE
Analogue Output
Analogue Output
Analogue Output
Supply
Supply
Analogue Output
Analogue Input
Analogue Input
Supply
Supply
Supply
Digital Input / Output
Digital Input / Output
Digital Input
Digital Input
Digital Output
Digital Input
Digital Input/Output
Analogue Output
Supply
Supply
Analogue Output
Analogue Output
Supply
Analogue Output
Supply
Analogue Output
Supply
Supply
Analogue Output
Analogue Output
Analogue Output
DESCRIPTION
Charge pump negative supply decoupling (powers HP_L,
HP_R)
Charge pump fly-back capacitor pin
Charge pump fly-back capacitor pin
Charge pump ground (Return path for CPVDD)
Charge pump power supply
Microphone bias
Right channel input
Left channel input
Microphone bias amp supply
Digital core and buffer (I/O) supply
Digital ground
Audio interface bit clock
Audio interface left / right clock
DAC digital audio data
Master clock
ADC digital audio data
Control interface clock input
Control interface data input / 2-wire acknowledge output
Right speaker negative output
Ground for right speaker drivers
Supply for right speaker drivers
Right speaker positive output
Left speaker negative output
Ground for left speaker drivers
Left speaker positive output
Supply for left speaker drivers
Mid-rail voltage =AVDD/2 (requires decoupling capacitor)
Analogue ground (Return path for AVDD)
Analogue supply
Right output (Line or headphone)
Left output (Line or headphone)
Charge pump positive supply decoupling (powers HP_L,
HP_R)
Die Paddle (Note 1)
Note:
It is recommended that the QFN ground paddle should be connected to analogue ground on the application PCB.
Refer to the application note WAN_0118 on “Guidelines on How to Use QFN Packages and Create Associated PCB Footprints”
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PP, August 2009, Rev 3.1
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WM8961 pdf, datenblatt
WM8961
Pre-Production
TYPICAL POWER CONSUMPTION
The WM8961 power consumption is dependent on many parameters. Most significantly, it depends on
supply voltages, sample rates, mode of operation, and output loading.
The power consumption on each supply rail varies approximately with the square of the voltage.
Power consumption is greater at fast sample rates than at slower ones. When the digital audio
interface is operating in Master mode, the DVDD current is significantly greater than in Slave mode.
(Note also that power savings can be made by using MCLK as the BCLK source in Slave mode.) The
output load conditions (impedance, capacitance and inductance) can also impact significantly on the
device power consumption.
COMMON TEST CONDITIONS
Unless otherwise stated, the following test conditions apply throughout the following sections:
Ambient temperature = +25°C
Audio signal = quiescent (zero amplitude)
Sample rate = 48kHz
MCLK = 12.288MHz
MEASUREMENTS
Additional, variant test conditions are quoted within the relevant sections below. Where applicable,
power dissipated in the headphone or line loads is included.
All measurements given in this section are typical and derived from evaluation.
Stereo line record - LINPUT1 and RINPUT1 pins to ADC output.
Test conditions:
LINVOL = RINVOL = 011111b (0dB)
Variant test conditions
AVDD
DVDD
48kHz sample rate, quiescent
48kHz sample rate, quiescent, MBSEL=1
48kHz sample rate, -1dBFS Input
8kHz sample rate (256fS i.e. MCLK =
2.048MHz)
V mA V mA
1.8 7.08 1.8
1.8
1.8 7.08 1.8
1.8
1.8 7.12 1.8
1.8
1.8 6.85 1.8 0.30
SPKVDD
V mA
5.0 0.001
5.0 0.001
5.0 0.001
5.0 0.001
MICVDD
V mA
2.5 0.001
2.5 0.258
2.5 0.001
2.5 0.001
TOTAL (see
note 1)
mW
16
16.7
16.1
12.9
Note:
1. CPVDD consumed 0.004mA in all cases.
Stereo Playback DAC to Headphones – Low Power Headphone Playback with 16load.
Test conditions
CP_DYN_PWR[1:0] = 0b11 (Dynamic control of charge pump power)
48kHz sample rate
Variant test conditions
AVDD
DVDD
Quiescent
Po = 2mW/channel
Po = 16mW/channel
V mA V mA
1.8 1.79 1.8 1.55
1.8 1.79 1.8 1.57
1.8 1.82 1.8 1.57
SPKVDD
V mA
5.0 0.002
5.0 0.002
5.0 0.002
CPVDD
V mA
1.8 0.54
1.8 18.0
1.8 59.8
TOTAL
mW
6.99
38.2
114
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PP, August 2009, Rev 3.1
12

12 Page





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