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WM8756 데이터시트 PDF




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부품번호 WM8756 기능
기능 192KHZ SIX CHANNEL SACD COMPATIBLE AUDIO DAC
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WM8756 데이터시트, 핀배열, 회로
WM8756
192kHz, Six Channel SACD™ Compatible Audio DAC
DESCRIPTION
The WM8756 is a high performance 6-channel DAC
designed for audio applications such as SACD™ players,
DVD-V and DVD-A, home audio and theatre systems. The
device supports data input word lengths from 16 to 32-bits
and sampling rates up to 192kHz. The WM8756 can
implement 2 or 6 channels at 192kHz for high-end DVD-
Audio, or 6 channels at up to 192kHz for surround
applications. Additionally 64x DSD bitstream support is
offered on all 6 channels. The WM8756 consists of a serial
interface port, digital interpolation filters, multi-bit sigma
delta modulators and 6 DACs in a 48-pin TQFP package.
The WM8756 also includes a digitally controllable mute and
attenuator function on each channel, accessible during
PCM operation. An on-chip multiplexer selects between
PCM or DSD audio data input pins.
The WM8756 supports hardware or software connection
schemes for audio DAC control. The serial control interface
provides access to a wide range of features including on-
chip mute, attenuation and phase reversal. Hardware pin-
controllable operation is also available.
The WM8756 is an ideal device for all surround sound
applications supporting the SACD™ audio format, such as
SACD players, multi-format players and home
entertainment systems.
FEATURES
6-Channel DAC with PCM or Bitstream (DSD) operation.
DSD 64x Bitstream Support for Super Audio CD™
Independent input pins for PCM and DSD data with on-
chip multiplexer
THD –96dB, SNR 106dB (‘A’ weighted @ 48kHz)
PCM mode Sampling Rate: 8kHz – 192kHz
Master or slave operation with Normal or Phase
modulation method of DSD data transfer
3-Wire Serial Control Interface
Programmable PCM Audio Data Interface Modes
I2S, Left, Right Justified or DSP
16/20/24/32 bit Word Lengths
Independent Digital Volume Control on Each Channel with
127.5dB Range in 0.5dB Steps (in PCM mode)
3.0V – 5.5V Supply (3.3V digital / 5V analogue option)
48-pin TQFP Package
APPLICATIONS
Super Audio CD (SACD™) Players
Universal and Multi-Format disc players
Home theatre systems
BLOCK DIAGRAM
CSB SCKI ML/I2S MC/IWL MD/DM DSDB MODE MUTE DMSLV DMCKSEL
BCKIN
LRCIN
LRCIN2
DIN0
DIN1
DIN2
PCM
DATA
DSDCLK128
DSDCLK64
DSD0
DSD1
DSD2
DSD3
DSD4
DSD5
AUDIO
INTERFACE
DSD
DATA
CONTROL
INTERFACE
PCM/DSD
DIGITAL
FILTERS
SIGMA
DELTA
MODULATOR
MUX
RIGHT
DAC
SIGMA
DELTA
MODULATOR
MUX
LEFT
DAC
PCM/DSD
DIGITAL
FILTERS
SIGMA
DELTA
MODULATOR
MUX
RIGHT
DAC
SIGMA
DELTA
MODULATOR
MUX
LEFT
DAC
DIGITAL
FILTERS
PCM/DSD
SIGMA
DELTA
MODULATOR
MUX
RIGHT
DAC
SIGMA
DELTA
MODULATOR
MUX
LEFT
DAC
LOW
PASS
FILTER
LOW
PASS
FILTER
LOW
PASS
FILTER
LOW
PASS
FILTER
LOW
PASS
FILTER
LOW
PASS
FILTER
OUT0R
GR0
OUT0L
OUT1R
GR1
OUT1L
OUT2R
GR2
OUT2L
DVDD DGND
WOLFSON MICROELECTRONICS LTD
www.wolfsonmicro.com
AGND1 AGND2 AGND3 AVDD1 AVDD2
Advance Information October 2001, Rev 1.3
Copyright 2001 Wolfson Microelectronics Ltd.




WM8756 pdf, 반도체, 판매, 대치품
WM8756
Advance Information
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.
CONDITION
Digital supply voltage
Analogue supply voltage
Voltage range digital inputs
Voltage range analogue inputs
Master Clock Frequency
Operating temperature range, TA
Storage temperature
Lead temperature (soldering 10 seconds)
Lead temperature (soldering 2 minutes)
Table 1 Absolute maximum ratings
MIN
-0.3V
-0.3V
DGND -0.3V
AGND -0.3V
-25°C
-65°C
MAX
+7V
+7V
DVDD +0.3V
AVDD +0.3V
37MHz
+85°C
+150°C
+240°C
+183°C
AI Rev 1.3 October 2001
4

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WM8756 전자부품, 판매, 대치품
WM8756
DIGITAL FILTER CHARACTERISTICS
PARAMETER
Passband
Stopband
Passband Ripple
Stopband Attenuation
SYMBOL
TEST CONDITIONS
±0.05 dB
-3dB
f > 0.555fs
Table 4 Digital Filter Characteristics – PCM operation
MIN
0.444fs
TYP
0.487fs
Advance Information
MAX
±0.05
-60
UNIT
dB
dB
dB
SACD FILTER CHARACTERISTICS
With 64fs DSD data where fs = 44.1ks/s.
RESPONSE
Pass band peak ripple
Attenuation at 20kHz
Attenuation at 50kHz
Attenuation at 100kHz
FILTER RESPONSE WITHOUT POST-
FILTER
0.017dB
-0.012dB
-2.3dB
-15.5dB
Table 5 Overall frequency response in SACD mode.
FILTER RESPONSE WITH 3RD ORDER
BUTTERWORTH POST-FILTER (-3dB AT 55KHZ)
0.017dB
-0.021dB
-3.9dB
-31dB
TERMINOLOGY
1. Signal-to-noise ratio (dB) - SNR is a measure of the difference in level between the full scale output and the output with no
signal applied. (No Auto-zero or Automute function is employed in achieving these results).
2. Dynamic range (dB) - DNR is a measure of the difference between the highest and lowest portions of a signal. Normally a
THD+N measurement at 60dB below full scale. The measured signal is then corrected by adding the 60dB to it. (e.g.
THD+N @ -60dB= -32dB, DR= 92dB).
3. THD+N (dB) - THD+N is a ratio, of the rms values, of (Noise + Distortion)/Signal.
4. Stop band attenuation (dB) - Is the degree to which the frequency spectrum is attenuated (outside audio band).
5. Channel Separation (dB) - Also known as Cross-Talk. This is a measure of the amount one channel is isolated from the
other. Normally measured by sending a full scale signal down one channel and measuring the other.
6. Pass-Band Ripple - Any variation of the frequency response in the pass-band region.
AI Rev 1.3 October 2001
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