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PDF WM8706 Data sheet ( Hoja de datos )
| Número de pieza | WM8706 | |
| Descripción | 24-bit/ 192kHz Stereo DAC with Volume Control | |
| Fabricantes | Wolfson Microelectronics plc | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de WM8706 (archivo pdf) en la parte inferior de esta página. Total 24 Páginas | ||
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WM8706
24-bit, 192kHz Stereo DAC with Volume Control
Product Preview, Rev 1.2, April 2001
DESCRIPTION
The WM8706 is a high performance stereo DAC designed
for audio applications such as DVD, home theatre systems,
and digital TV. The WM8706 supports data input word
lengths from 16 to 32-bits and sampling rates up to 192kHz.
The WM8706 can implement 2 channels at 192kHz for high-
end DVD-Audio. The WM8706 consists of a serial interface
port, digital interpolation filters, multi-bit sigma delta
modulators and stereo DAC in a small 28-pin SSOP
package. The WM8706 also includes a digitally controllable
mute and attenuate function on each channel.
The WM8706 supports a variety of connection schemes for
audio DAC control. The MPU 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. It is pin-compatible with the WM8716
provided the oscillator circuit on WM8716 is not required in
the application.
The WM8706 is an ideal device to interface to AC-3,
DTS, and MPEG audio decoders for surround sound
applications, or for use in DVD players supporting DVD-A.
BLOCK DIAGRAM
FEATURES
• Stereo DAC
• Audio Performance
- 106dB SNR (‘A’ weighted @ 48kHz) DAC
- -97dB THD
• DAC Sampling Frequency: 8kHz – 192kHz
• 3-Wire Serial Control Interface or Hardware Control
• Programmable Audio Data Interface Modes
- I2S, Left, Right Justified, DSP
- 16/20/24/32 bit Word Lengths
• Independent Digital Volume Control on Each Channel with
127.5dB Range in 0.5dB Steps
• 3.0V – 5.5V Supply Operation
• 28-Pin SSOP Package
• Exceeds Dolby Class A Performance Requirements
APPLICATIONS
• DVD-Audio and DVD ‘Universal’ Players
• Home theatre systems
• Digital TV
• Digital broadcast receivers
MODE MLIIS MCDM1 MDDM0 MUTEB CSBIWO ZERO
CONTROL INTERFACE
WM8706
BCKIN
LRCIN
DIN
SERIAL
INTERFACE
MUTE/
ATTEN
MUTE/
ATTEN
DIGITAL FILTERS
SIGMA
DELTA
MODULATOR
SIGMA
DELTA
MODULATOR
RIGHT
DAC
LEFT
DAC
LOW
PASS
FILTER
LOW
PASS
FILTER
VOUTR
VOUTL
VMID
XTI AVDD DVDD
VREFP VREFN AGND DGND
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
Product Preview data sheets contain
specifications for products in the formative
phase of development. These products may
be changed or discontinued without notice.
2001 Wolfson Microelectronics Ltd.
1 page  
WM8706
Product Preview
DC ELECTRICAL CHARACTERISTICS
PARAMETER
Digital supply range
Analogue supply range
Ground
Difference DGND to AGND
Analogue supply current
Digital supply current
Analogue supply current
Digital supply current
SYMBOL
DVDD
AVDD
AGND, DGND
TEST CONDITIONS
AVDD = 5V
DVDD = 5V
AVDD = 3.3V
DVDD = 3.3V
MIN
3.0
3.0
-0.3
TYP
0
0
19
8
18
4
MAX
5.5
5.5
+0.3
UNIT
V
V
V
V
mA
mA
mA
mA
ELECTRICAL CHARACTERISTICS
Test Conditions
AVDD, DVDD = 5V, AGND, DGND = 0V, TA = +25oC, fs = 48kHz, XTI = 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 = 1mA
AGND + 0.3V
Output HIGH
VOH
IOH = 1mA
AVDD - 0.3V
Analogue Reference Levels
Reference voltage
VMID
(VREFP -
VREFN)/2 -
50mV
(VREFP -
VREFN)/2
(VREFP -
VREFN)2 +
50mV
Potential divider resistance
RVMID
12k
DAC Output (Load = 10K ohms. 50pF)
0dBFs Full scale output voltage
At DAC outputs
1.1 x
AVDD/5
SNR (Note 1,2,3)
A-weighted,
100 106
@ fs = 48kHz
SNR (Note 1,2,3)
A-weighted
106
@ fs = 96kHz
SNR (Note 1,2,3)
A-weighted
106
@ fs = 192kHz
SNR (Note 1,2,3)
A-weighted,
105
@ fs = 48kHz
AVDD, DVDD = 3.3V
SNR (Note 1,2,3)
A-weighted
103
@ fs = 96kHz
AVDD, DVDD = 3.3V
SNR (Note 1,2,3)
Non ‘A’ weighted @ fs
= 48kHz
106
THD (Note 1,2,3)
1kHz, 0dBfs
-97
THD+N (Dynamic range, Note 2)
1kHz, -60dBfs 100 106
DAC channel separation
100
UNIT
V
V
V
V
V
ohms
Vrms
dB
dB
dB
dB
dB
dB
dB
dB
dB
WOLFSON MICROELECTRONICS LTD
PP Rev 1.2 April 2001
5
5 Page 
WM8706
Product Preview
I2S MODE
In I2S mode, the MSB is sampled on the second rising edge of BCKIN following a LRCIN
transition. LRCIN is low during the left samples and high during the right samples.
1/fs
LRCIN
LEFT CHANNEL
RIGHT CHANNEL
BCKIN
1 BCKIN
DIN 1 2 3
MSB
n-2 n-1 n
LSB
Figure 6 I2S Mode Timing Diagram
1 BCKIN
123
MSB
n-2 n-1 n
LSB
DSP EARLY MODE
In DSP early mode, the first bit is sampled on the BCKIN rising edge following the one which
detects a low to high transition on LRCIN. No BCKIN edges are allowed between the data
words. The word order is DIN left, DIN right.
LRCIN
BCKIN
DIN
1 BCKIN
1/fs
LEFT CHANNEL
RIGHT CHANNEL
12
MSB
n-1 n 1
LSB
2
Input Word Length (IWO)
n-1 n
1 BCKIN
NO VALID DATA
Figure 7 DSP Early Mode Timing Diagram
DSP LATE MODE
In DSP late mode, the first bit is sampled on the BCKIN rising edge which detects a low to high
transition on LRCIN. No BCKIN edges are allowed between the data words. The word order is
DIN left, DIN right.
1/fs
LRCIN
BCKIN
DIN
LEFT CHANNEL
RIGHT CHANNEL
12
MSB
n-1 n 1
LSB
2
Input Word Length (IWO)
n-1 n
Figure 8 DSP Late Mode Timing Diagram
NO VALID DATA
1
WOLFSON MICROELECTRONICS LTD
PP Rev 1.2 April 2001
11
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet WM8706.PDF ] | |
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