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PDF WM8736EDS Data sheet ( Hoja de datos )
| Número de pieza | WM8736EDS | |
| Descripción | 24-bit/ 96kHz 6-Channel DAC with Volume Control | |
| Fabricantes | Wolfson Microelectronics plc | |
| Logotipo |  |
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WM8736
24-bit, 96kHz 6-Channel DAC with Volume Control
Production Data, January 2001, Rev 2.1
DESCRIPTION
The WM8736 is a high performance 6-channel DAC
designed for audio applications such as DVD, home theatre
systems, and digital TV. The WM8736 supports data input
word lengths from 16 to 24-bits and sampling rates up to
96kHz. The WM8736 consists of a serial interface port,
digital interpolation filters, multi-bit sigma delta modulators
and 6 DACs in a small 28-pin SSOP package. The
WM8736 also includes a digitally controllable mute and
attenuator function on each channel.
The WM8736 supports a variety of connection schemes for
audio DAC control. The SPI-compatible serial port provides
access to a wide range of features including on-chip mute,
attenuation and phase reversal. A hardware controllable
interface is also available.
The WM8736 is an ideal device to interface to AC-3,
DTS, and MPEG audio decoders for surround sound
applications.
FEATURES
• 6-channel DAC
• Performance:
− 102dB SNR (‘A’ weighted @ 48kHz), THD+N: -95dB
at full scale
• 5V or 3.3V supply operation
• Sampling frequency: 8kHz to 96kHz
• Input data word: 16 to 24-bit
• Hardware or SPI compatible serial port control modes:
− Hardware mode: system clock, reset, mute
− Serial control mode: mute, de-emphasis, digital
attenuation (256 steps), zero mute, power down
APPLICATIONS
• DVD
• Home theatre systems
• Digital TV
• Digital broadcast receivers
BLOCK DIAGRAM
SCKI
(2)
ML/I2S MC/IWL MD/DM
(12) (13) (14)
RSTB MODE MUTE
(10) (8)
(9)
BCKIN (3)
LRCIN (4)
DIN0 (5)
DIN1 (6)
DIN2 (7)
256fs/384fs/512fs
WM8736
CONTROL INTERFACE
MUTE/
ATTEN
SIGMA
DELTA
MODULATOR
STEREO
DAC
SERIAL
INTERFACE
DIGITAL
FILTERS
MUTE/
ATTEN
SIGMA
DELTA
MODULATOR
STEREO
DAC
MUTE/
ATTEN
SIGMA
DELTA
MODULATOR
STEREO
DAC
(27) OUT0R
(26) GR0
(25) OUT0L
(23) OUT1R
(22) GR1
(21) OUT1L
(19) OUT2R
(18) GR2
(17) OUT2L
(24) (20) (11) (16)
(28) (15)
(1)
AGND2 AGND1 DGND CAP AVDD2 AVDD1 DVDD
WOLFSON MICROELECTRONICS LTD
Lutton Court, Bernard Terrace, Edinburgh, EH8 9NX, UK
Tel: +44 (0) 131 667 9386
Fax: +44 (0) 131 667 5176
Email: [email protected]
www.wolfsonmicro.com
Production Data Datasheets contain final
specifications current on publication date.
Supply of products conforms to Wolfson
Microelectronics’ Terms and Conditions.
2001 Wolfson Microelectronics Ltd.
1 page  
Production Data
ML/12S
MC/IWL
MD/DM
tMCH
tMCL
tMCY
tMDS
tMDH
WM8736
tMLS
tMLL
tMLH
Figure 3 Program Register Input Timing
Test Conditions
AVDD, DVDD = 5V, AGND, DGND = 0V, TA = +25oC, fs = 48kHz, SCKI = 256fs unless otherwise stated.
PARAMETER
SYMBOL
Program Register Input Information
MC/IWL pulse cycle time
MC/IWL pulse width low
MD/DM pulse width high
MD/DM set-up time
MC/IWL hold time
ML/I2S pulse width low
ML/I2S set-up time
ML/I2S hold time
tMCY
tMCL
tMCH
tMDS
tMDH
tMLL
tMLS
tMLH
Notes:
TEST CONDITIONS
MIN
TYP
MAX
UNIT
100 ns
50 ns
50 ns
30 ns
30 ns
30 ns
30 ns
30 ns
1. Ratio of output level with 1kHz full scale input, to the output level with all zeros into the digital input, measured “A”
weighted over a 20Hz to 20kHz bandwidth.
2. All performance measurements done with 20kHz low pass filter. Failure to use such a filter will result in higher
THD+N and lower SNR and Dynamic Range readings than are found in the Electrical Characteristics. The low pass
filter removes out of band noise; although it is not audible it may affect dynamic specification values.
WOLFSON MICROELECTRONICS LTD
PD Rev 2.1 January 2001
5
5 Page 
Production Data
RSTB RESET AND POWER DOWN CONTROL
WM8736
In both hardware and software modes, this pin resets the entire device when taken low. The device
remains powered down while RSTB is held low.
RSTB
0
RSTB
1
Table 6 Reset and Power Down Control
Device powered down and reset
Device powered up and active
SOFTWARE CONTROL INTERFACE
The WM8736 can be controlled using a 3-wire serial interface. MD/DM (pin 6) is used for the program
data, MC/IWL (pin 5) is used to clock in the program data and ML/I2S (pin 4) is use to latch in the
program data. The 3-wire interface protocol is shown in Figure 7.
ML/I2S
MC/IWL
MD/DM
B2 B1 B0 A3 A2 A1 A0 D8 D7 D6 D5 D4 D3 D2 D1 D0
Figure 7 3-Wire Serial Interface
REGISTER MAP
WM8736 controls the special functions using 9 program registers, which are 16-bits long. These
registers are all loaded through input pin MD/DM. After the 16 data bits are clocked in, ML/I2S is
used to latch in the data to the appropriate register. Table 7 shows the complete mapping of the
9 registers.
B2 B1 B0 A3 A2 A1
NOT USED
ADDRESS
M0 - - - 0 0 0
M1 - - - 0 0 0
M2 - - - 0 0 1
M3 - - - 0 0 1
M4 - - - 0 1 0
M5 - - - 0 1 0
M6 - - - 0 1 1
M7 - - - 0 1 1
M8 - - - 1 0 0
Table 7 Mapping of Program Registers
A0 D8 D7 D6 D5 D4 D3 D2 D1 D0
DATA
0 LDL AL7 AL6 AL5 AL4 AL3 AL2 AL1 AL0
1 LDR AR7 AR6 AR5 AR4 AR3 AR2 AR1 AR0
0 PL3 PL2 PL1 PL0 IW1 IW0 OPE DE MU
1 IZD - - - - - ATC LRP I2S
0 LDL AL7 AL6 AL5 AL4 AL3 AL2 AL1 AL0
1 LDR AR7 AR6 AR5 AR4 AR3 AR2 AR1 AR0
0 LDL AL7 AL6 AL5 AL4 AL3 AL2 AL1 AL0
1 LDR AR7 AR6 AR5 AR4 AR3 AR2 AR1 AR0
0 LDM AM7 AM6 AM5 AM4 AM3 AM2 AM1 AM0
WOLFSON MICROELECTRONICS LTD
PD Rev 2.1 January 2001
11
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