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PDF WM8756 Data sheet ( Hoja de datos )
| Número de pieza | WM8756 | |
| Descripción | 192KHZ SIX CHANNEL SACD COMPATIBLE AUDIO DAC | |
| Fabricantes | Wolfson Microelectronics plc | |
| Logotipo |  |
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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.
1 page  
WM8756
DC ELECTRICAL CHARACTERISTICS
Advance Information
PARAMETER
Digital supply range
Analogue supply range
Ground
Difference of DGND to AGND
Difference of GR to AGND
Analogue supply current
Digital supply current
Analogue supply current
Digital supply current
Analogue supply current
Digital supply current
SYMBOL
DVDD
AVDD
AGND, DGND
Table 2 DC electrical characteristics
TEST CONDITIONS
AVDD = 5V
DVDD = 5V
AVDD = 3.3V
DVDD = 3.3V
Power down, stop clock
Power down, stop clock
MIN
3.0
3.0
-0.3
-0.3
TYP
0
0
0
58
22
57
11
0.4
0.09
MAX
5.5
5.5
+0.3
+0.3
UNIT
V
V
V
V
V
mA
mA
mA
mA
mA
mA
Note:
1. AVDD must be equal or greater than DVDD. DVDD = 3V, AVDD = 5V is allowed.
2. Where used AVDD represents AVDD1 = AVDD2, AGND represents AGND1 = AGND2 = AGND3 and GR represents
GR0 = GR1 = GR2.
AC ELECTRICAL CHARACTERISTICS
Test Conditions
AVDD = DVDD = 3V, AGND = 0V = DGND = 0V, TA = +25oC, fs = 48kHz, SCKI = 256fs unless otherwise stated.
PARAMETER
SYMBOL TEST CONDITIONS
MIN
TYP MAX
Digital Logic Levels (TTL Levels)
Input LOW level
VIL
0.8
Input HIGH level
VIH
2.0
Output LOW
VOL IOL = 2mA
0.4
Output HIGH
VOH
IOH = 2mA
2.4
Analogue Reference Levels
Reference voltage
VCAP
AVDD2 –
GR2/2
Potential divider resistance
RCAP
25K
DAC Output (Load = 10K ohms. 50pF)
0dBFs Full scale output voltage
At DAC outputs
1.1 x
AVDD1/5
SNR (Note 1,2,3)
A-weighted,
100 106
@ fs = 48KHz
SNR (Note 1,2,3)
A-weighted
98 105
@ fs = 96KHz
SNR (Note 1,2,3)
A-weighted
105
@ fs = 192KHz
SNR (Note 1,2,3)
A-weighted,
103
@ fs = 48KHz
AVDD=DVDD=3.3V
SNR (Note 1,2,3)
A-weighted
103
@ fs = 96KHz
AVDD=DVDD=3.3V
UNIT
V
V
V
V
V
Ohms
Vrms
dB
dB
dB
dB
dB
AI Rev 1.3 October 2001
5
5 Page 
WM8756
DIGITAL CONTROL INTERFACE TIMING
ML/I2S
MC/IWL
MD/DM
tMCY
tMCH
tMCL
tDSU
tDHO
Advance Information
tMLL
tMLH
tCSS
tSCS
LSB
Figure 5 Control Interface Input Timing: 3-Wire Serial Control Mode
Test Conditions
AVDD= DVDD = 5V, AGND= GR= DGND = 0V, TA = +25oC, fs = 48kHz, SCKI = 256fs unless otherwise stated.
PARAMETER
SYMBOL
Program Register Input Information
MC/IWL rising edge to ML/I2S
rising edge
tSCS
TEST CONDITIONS
MC/IWL pulse cycle time
MC/IWL pulse width low
MC/IWL pulse width high
MD/DM to MC/IWL set-up time
MC/IWL to MD/DM hold time
ML/I2S pulse width low
ML/I2S pulse width high
ML/I2S rising to MC/IWL rising
tMCY
tMCL
tMCH
tDSU
tDHO
tMLL
tMLH
tCSS
Table 10 Control Interface Input Timing Information
MIN
TYP
MAX
60
80
20
20
20
20
20
20
20
UNIT
ns
ns
ns
ns
ns
ns
ns
ns
ns
AI Rev 1.3 October 2001
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet WM8756.PDF ] | |
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