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Número de pieza | WM8768 | |
Descripción | 8-Channel DAC | |
Fabricantes | Wolfson Microelectronics | |
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24-bit, 192kHz 8-Channel DAC
WM8768
DESCRIPTION
The WM8768 is a multi-channel audio DAC ideal for DVD
and surround sound processing applications for home hi-fi,
automotive and other audio visual equipment.
Four stereo 24-bit multi-bit sigma delta DACs are used with
oversampling digital interpolation filters. Digital audio input
word lengths from 16-32 bits and sampling rates from 8kHz
to 192kHz are supported. Each DAC channel has
independent digital volume and mute control.
The audio data interface supports I2S, left justified, right
justified and DSP digital audio formats.
The device is controlled either via a 3 wire serial interface or
directly using the hardware interface. These interfaces
provide access to features including channel selection,
volume controls, mutes, de-emphasis and power
management facilities. The device is available in a 28-lead
SSOP.
BLOCK DIAGRAM
FEATURES
• 8-Channel DAC with PCM.
• Audio Performance
− 103dB SNR (‘A’ weighted @ 48kHz) DAC
• DAC Sampling Frequency: 8kHz – 192kHz
• 3-Wire SPI Serial or Hardware Control Interface
• Programmable Audio Data Interface Modes
− I2S, Left, Right Justified or DSP
− 16/20/24/32 bit Word Lengths
• Four Independent stereo DAC outputs with independent
digital volume controls
• Master or Slave Audio Data Interface
• 2.7V to 5.5V Analogue, 2.7V to 3.6V Digital supply
Operation
• 28 lead SSOP Package
APPLICATIONS
• DVD Players
• Surround Sound AV Processors and Hi-Fi systems
• Automotive Audio
WOLFSON MICROELECTRONICS plc
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Production Data, July 2010, Rev 4.3
Copyright ©2010 Wolfson Microelectronics plc
1 page Production Data
WM8768
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
Digital supply voltage
-0.3V
+5V
Analogue supply voltage
-0.3V
+7V
Voltage range digital inputs
DGND -0.3V
DVDD +0.3V
Voltage range analogue inputs
AGND -0.3V
AVDD +0.3V
Master Clock Frequency
37MHz
Operating temperature range, TA
Storage temperature after soldering
-25°C
-65°C
+85°C
+150°C
Notes:
1. Analogue and digital grounds must always be within 0.3V of each other for normal operation of the device.
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PD Rev 4.3 July 2010
5
5 Page Production Data
MPU INTERFACE TIMING
ML/I2S
MC/IWL
tSCY
tSCH
tSCL
WM8768
tCSL
tCSH
tCSS
tSCS
MD/DM
tDSU
tDHO
LSB
Figure 6 SPI Compatible Control Interface Input Timing
Test Conditions
AVDD = 5V, DVDD = 3.3V, AGND, DGND = 0V, TA = +25oC, fs = 48kHz, MCLK = 256fs unless otherwise stated
PARAMETER
SYMBOL
MIN
MC/IWL rising edge to ML/I2S rising edge
tSCS
60
MC/IWL pulse cycle time
tSCY
80
MC/IWL pulse width low
tSCL 30
MC/IWL pulse width high
tSCH
30
MD/DM to MC/IWL set-up time
MC/IWL to MD/DM hold time
tDSU
tDHO
20
20
ML/I2S pulse width low
tCSL 20
ML/I2S pulse width high
tCSH
20
ML/I2S rising to MC/IWL rising
tCSS
20
Table 4 3-wire SPI Compatible Control Interface Input Timing Information
TYP MAX
UNIT
ns
ns
ns
ns
ns
ns
ns
ns
ns
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PD Rev 4.3 July 2010
11
11 Page |
Páginas | Total 30 Páginas | |
PDF Descargar | [ Datasheet WM8768.PDF ] |
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