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PDF WM8976 Data sheet ( Hoja de datos )
| Número de pieza | WM8976 | |
| Descripción | Low Power CODEC With Speaker Driver | |
| Fabricantes | Wolfson Microelectronics | |
| Logotipo |  |
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WM8976
Stereo CODEC with Speaker Driver
DESCRIPTION
The WM8976 is a low power, high quality CODEC designed
for portable applications such as multimedia phone, digital
still camera or digital camcorder.
The device integrates a preamp for differential microphone,
and includes drivers for speakers, headphone and
differential or stereo line output. External component
requirements are reduced as no separate microphone or
headphone amplifiers are required.
Advanced on-chip digital signal processing includes a 5-
band equaliser, a mixed signal Automatic Level Control for
the microphone or line input through the ADC as well as a
purely digital limiter function for record or playback.
Additional digital filtering options are available in the ADC
path, to cater for application filtering such as ‘wind noise
reduction’.
The WM8976 digital audio interface can operate as a master
or a slave. An internal PLL can generate all required audio
clocks for the CODEC from common reference clock
frequencies, such as 12MHz and 13MHz.
The WM8976 operates at analogue supply voltages from
2.5V to 3.3V, although the digital core can operate at
voltages down to 1.71V to save power. The speaker outputs
and OUT3/4 line outputs can run from a 5V supply if
increased output power is required. Individual sections of
the chip can also be powered down under software control.
FEATURES
Stereo CODEC:
DAC SNR 98dB, THD -84dB (‘A’ weighted @ 48kHz)
ADC SNR 95dB, THD -84dB (‘A’ weighted @ 48kHz)
On-chip Headphone Driver with ‘capless’ option
- 40mW per channel into 16 / 3.3V SPKVDD
1W output power into 8 BTL speaker / 5V SPKVDD
- Capable of driving piezo speakers
- Stereo speaker drive configuration
Mic Preamps:
Differential or single-ended microphone interfaces
- Programmable preamp gain
- Pseudo differential input with common mode rejection
- Programmable ALC / Noise Gate in ADC path
Low-noise bias supplied for electret microphone
Other Features:
Enhanced 3-D function for improved stereo separation
Digital playback limiter
5-band Equaliser (record or playback)
Programmable ADC High Pass Filter (wind noise reduction)
Programmable ADC Notch Filter
Aux inputs for stereo analogue input signals or ‘beep’
On-chip PLL supporting 12, 13, 19.2MHz and other clocks
Support for 8, 11.025, 12, 16, 22.05, 24, 32, 44.1 and 48kHz
sample rates
Low power, low voltage
- 2.5V to 3.6V (digital: 1.71V to 3.6V)
5x5mm 32-lead QFN package
APPLICATIONS
Stereo Camcorder or DSC
Multimedia Phone
WOLFSON MICROELECTRONICS plc
To receive regular email updates, sign up at http://www.wolfsonmicro.com/enews
Production Data, November 2011, Rev 4.5
Copyright 2011 Wolfson Microelectronics plc
1 page  
Production Data
WM8976
PIN DESCRIPTION
PIN NAME
1 LIP
2 LIN
3 L2/GPIO2
4 DNC
5 DNC
6 DNC
7 LRC
8 BCLK
9 ADCDAT
10 DACDAT
11 MCLK
12 DGND
13 DCVDD
14 DBVDD
15 CSB/GPIO1
16 SCLK
17 SDIN
18 MODE
19 AUXL
20 AUXR
21 OUT4
22 OUT3
23 ROUT2
24 SPKGND
25 LOUT2
26 SPKVDD
27 VMID
28 AGND
29 ROUT1
30 LOUT1
31 AVDD
32 MICBIAS
TYPE
Analogue input
Analogue input
Analogue input
Do not connect
Do not connect
Do not connect
Digital Input / Output
Digital Input / Output
Digital Output
Digital Input
Digital Input
Supply
Supply
Supply
Digital Input / Output
Digital Input
Digital Input / Output
Digital Input
Analogue input
Analogue input
Analogue Output
Analogue Output
Analogue Output
Supply
Analogue Output
Supply
Reference
Supply
Analogue Output
Analogue Output
Supply
Analogue Output
DESCRIPTION
Mic Pre-amp positive input
Mic Pre-amp negative input
Line input/secondary mic pre-amp positive input/GPIO2 pin
Leave this pin floating
Leave this pin floating
Leave this pin floating
DAC and ADC Sample Rate Clock
Digital Audio Port Clock
ADC Digital Audio Data Output
DAC Digital Audio Data Input
Master Clock Input
Digital ground
Digital core logic supply
Digital buffer (I/O) supply
3-Wire Control Interface Chip Select / GPIO1 pin
3-Wire Control Interface Clock Input / 2-Wire Control Interface Clock
Input
3-Wire Control Interface Data Input / 2-Wire Control Interface Data Input
Control Interface Selection
Left Auxiliary input
Right Auxiliary input
Buffered midrail Headphone pseudo-ground, or Right line output or MONO
mix output
Buffered midrail Headphone pseudo-ground, or Left line output
Second right output, or BTL speaker driver positive output
Speaker ground (feeds speaker amp and OUT3/OUT4)
Second left output, or BTL speaker driver negative output
Speaker supply (feed speaker amp only)
Decoupling for ADC and DAC reference voltage
Analogue ground (feeds ADC and DAC)
Headphone or Line Output Right
Headphone or Line Output Left
Analogue supply (feeds ADC and DAC)
Microphone Bias
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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PD, Rev 4.5, November 2011
5
5 Page 
Production Data
WM8976
POWER CONSUMPTION
Typical current consumption for various scenarios is shown below.
MODE
Off
AVDD
(3.0V)
(mA)
0.043
DCVDD
(1.8V)
(mA)
0.0008
Sleep (VREF maintained, no clocks)
MIC Record (8kHz)2
Stereo 16Ω HP Playback (48kHz, quiescent)2
Stereo 16Ω HP Playback (48kHz, white noise)2
Stereo 16Ω HP Playback (48kHz, sine wave)2
0.04
0.0008
4.1 1.0
3.3 6.2
5.4 7.3
18 6.7
Notes:
1. DBVDD Current will increase with greater loading on digital I/O pins.
2. 5 Band EQ is enabled.
3. AVDD standby current will fall to nearer 15uA when thermal shutdown sensor is disabled.
Table 1 Power Consumption
DBVDD1
(3.0V)
(mA)
<0.0001
<0.0001
0.001
0.004
0.004
0.004
TOTAL
POWER
(mW)
0.12
0.12
14.1
21.1
29.4
66.1
ESTIMATING SUPPLY CURRENT
When either the DAC or ADC is enabled approximately 7mA will be drawn from DCVDD when
DCVDD=1.8V and fs=48kHz. When the PLL is enabled approximately 1.5mA additional current will
be drawn from DCVDD.
As a general rule, digital supply currents will scale in proportion to sample rates. Supply current for
analogue and digital blocks will also be lower at lower supply voltages.
Power consumed by the output drivers will depend greatly on the signal characteristics. A quiet
signal, or a signal with long periods of silence will consume less power than a signal which is
continuously loud.
Estimated supply current for the analogue blocks is shown in Table 2. Note that power dissipated in
the load is not shown.
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PD, Rev 4.5, November 2011
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet WM8976.PDF ] | |
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