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PDF WM8776 Data sheet ( Hoja de datos )
| Número de pieza | WM8776 | |
| Descripción | 24 BIT 192KHZ STEREO CODEC WITH 5 CHANNEL I/P MULTIPLEXER | |
| Fabricantes | Wolfson Microelectronics plc | |
| Logotipo |  |
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WM8776
24-bit, 192kHz Stereo CODEC with 5 Channel I/P Multiplexer
DESCRIPTION
The WM8776 is a high performance, stereo audio
CODEC with five channel input selector. The WM8776 is
ideal for surround sound processing applications for
home hi-fi, DVD-RW and other audio visual equipment.
A stereo 24-bit multi-bit sigma delta ADC is used with a
five stereo channel input mixer. Each ADC channel has
programmable gain control with automatic level control.
Digital audio output word lengths from 16-32 bits and
sampling rates from 32kHz to 96kHz are supported.
A stereo 24-bit multi-bit sigma delta DAC is used with
digital audio input word lengths from 16-32 bits and
sampling rates from 32kHz to 192kHz. The DAC has an
input mixer allowing an external analogue signal to be
mixed with the DAC signal. There are also Headphone
and line outputs, with volume controls for the
headphones.
The WM8776 supports fully independent sample rates
for the ADC and DAC. The audio data interface supports
I2S, left justified, right justified and DSP formats.
The device is controlled in software via a 2 or 3 wire
serial interface, selected by the MODE pin, which
provides access to all features including channel
selection, volume controls, mutes, and de-emphasis
facilities.
The device is available in a 48-pin TQFP package.
BLOCK DIAGRAM
FEATURES
• Audio Performance
− 108dB SNR (‘A’ weighted @ 48kHz) DAC
− 102dB SNR (‘A’ weighted @ 48kHz) ADC
• DAC Sampling Frequency: 32kHz – 192kHz
• ADC Sampling Frequency: 32kHz – 96kHz
• Five stereo ADC inputs with analogue gain adjust from
+24dB to –21dB in 0.5dB steps
• Programmable Limiter or Automatic Level Control (ALC)
• Stereo DAC with independent analogue and digital
volume controls
• Stereo Headphone and Line Output
• 3-Wire SPI Compatible or 2-Wire Software Serial
Control Interface
• Master or Slave Clocking Mode
• Programmable Audio Data Interface Modes
− I2S, Left, Right Justified or DSP
− 16/20/24/32 bit Word Lengths
• Analogue Bypass Path Feature
• Selectable AUX input to the volume controls
• 2.7V to 5.5V Analogue, 2.7V to 3.6V Digital supply
Operation
APPLICATIONS
• Surround Sound AV Processors and Hi-Fi systems
• DVD-RW
WOLFSON MICROELECTRONICS plc
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Production Data, September 2008, Rev 4.1
Copyright ©2008 Wolfson Microelectronics plc
1 page  
Production Data
WM8776
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
Digital supply voltage
Analogue supply voltage
Voltage range digital inputs (MCLK, DIN, ADCLRC, DACLRC,
ADCBCLK, DACBCLK, DI, CL, CE and MODE)
Voltage range analogue inputs
Master Clock Frequency
Operating temperature range, TA
Storage temperature
Notes:
1. Analogue and digital grounds must always be within 0.3V of each other.
MIN
-0.3V
-0.3V
DGND -0.3V
AGND -0.3V
-25°C
-65°C
MAX
+3.63V
+7V
DVDD + 0.3V
AVDD +0.3V
37MHz
+85°C
+150°C
RECOMMENDED OPERATING CONDITIONS
PARAMETER
Digital supply range
Analogue supply range
Ground
Difference DGND to AGND
SYMBOL
DVDD
AVDD, HPVDD,
DACREFP
AGND, DGND,
DACREFN,
ADCREFGND
TEST CONDITIONS
MIN
2.7
2.7
-0.3
TYP
0
0
MAX
3.6
5.5
+0.3
UNIT
V
V
V
V
Note: digital supply DVDD must never be more than 0.3V greater than AVDD.
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PD, Rev 4.1, September 2008
5
5 Page 
Production Data
DIGITAL AUDIO INTERFACE – SLAVE MODE
DACBCLK
ADCBCLK
WM8776 ADCLRC
CODEC DACLRC
DOUT
DIN
DVD
Controller
WM8776
Figure 4 Audio Interface – Slave Mode
ADCBCLK/
DACBCLK
DACLRC/
ADCLRC
DIN
DOUT
tBCH
tBCL
tBCY
tDS
tDD
tLRH
tDH
tLRSU
Figure 5 Digital Audio Data Timing – Slave Mode
Test Conditions
AVDD = 5V, DVDD = 3.3V, AGND = 0V, DGND = 0V, TA = +25oC, Slave Mode, fs = 48kHz, ADC/DACMCLK = 256fs unless
otherwise stated.
PARAMETER
SYMBOL
Audio Data Input Timing Information
ADC/DACBCLK cycle time
ADC/DACBCLK pulse width
high
tBCY
tBCH
ADC/DACBCLK pulse width
low
tBCL
DACLRC/ADCLRC set-up
time to ADC/DACBCLK
rising edge
tLRSU
DACLRC/ADCLRC hold
time from ADC/DACBCLK
rising edge
tLRH
DIN set-up time to
DACBCLK rising edge
tDS
DIN hold time from
DACBCLK rising edge
tDH
DOUT propagation delay
from ADCBCLK falling edge
tDD
TEST CONDITIONS
MIN TYP MAX
50
20
20
10
10
10
10
0 10
Table 3 Digital Audio Data Timing – Slave Mode
Note: ADCLRC and DACLRC should be synchronous with MCLK, although the WM8776 interface is tolerant of phase
variations or jitter on these signals.
UNIT
ns
ns
ns
ns
ns
ns
ns
ns
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PD, Rev 4.1, September 2008
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet WM8776.PDF ] | |
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