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PDF WM8729 Data sheet ( Hoja de datos )
| Número de pieza | WM8729 | |
| Descripción | 24-bit/ 192kHz Stereo DAC | |
| Fabricantes | Wolfson Microelectronics plc | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de WM8729 (archivo pdf) en la parte inferior de esta página. Total 15 Páginas | ||
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DESCRIPTION
The WM8729 is a high performance stereo DAC designed
for audio applications such as DVD, home theatre systems,
and digital TV. The WM8729 supports data input word
lengths from 16 to 24-bits and sampling rates up to 192kHz.
The WM8729 consists of a serial interface port, digital
interpolation filters, multi-bit sigma delta modulators and
stereo DAC in a small 16-pin SOIC package.
The WM8729 has a hardware control interface for selection
of audio data interface format and de-emphasis.
The WM8729 is an ideal device to interface to AC-3,
DTS, and MPEG audio decoders for surround sound
applications, or for use in DVD players, including supporting
the implementation of 2 channels at 192kHz for high-end
DVD-Audio applications.
WM8729
24-bit, 192kHz Stereo DAC
Product Preview, Rev 1.2, April 2001
FEATURES
• Stereo DAC
• Audio Performance
- 106dB SNR (‘A’ weighted @ 48kHz) DAC
- -97dB THD
• DAC Sampling Frequency: 8kHz – 192kHz
• Pin Selectable Audio Data Interface Format
- I2S or Right Justified
• 3.0V - 5.5V Supply Operation
• 16-pin SOIC Package
• Exceeds Dolby Class A Performance Requirements
APPLICATIONS
• DVD-Audio and DVD ‘Universal’ Players
• Home theatre systems
• Digital TV
• Digital broadcast receivers
BLOCK DIAGRAM
FORMAT MUTEB DEM
CONTROL INTERFACE
WM8729
BCKIN
LRCIN
DIN
SERIAL
INTERFACE
MUTE
MUTE
DIGITAL FILTERS
SIGMA
DELTA
MODULATOR
SIGMA
DELTA
MODULATOR
RIGHT
DAC
LOW
PASS
FILTER
VOUTR
LEFT
DAC
LOW
PASS
FILTER
VOUTL
MCLK
AVDD DVDD
VMID
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  
WM8729
Product Preview
Test Conditions
AVDD, DVDD = 5V, AGND = 0V, DGND = 0V, TA = +25oC, fs = 48kHz, MCLK = 256fs unless otherwise stated.
PARAMETER
SYMBOL TEST CONDITIONS
MIN
TYP MAX
Minimum resistance load
To midrail or a.c.
coupled
1
To midrail or a.c.
coupled
(AVDD = 3.3V)
600
Maximum capacitance load
5V or 3.3V
100
Output d.c. level
(VREFP -
VREFN)/2
Power On Reset (POR)
POR threshold
2.4
UNIT
kohms
ohms
pF
V
V
Notes:
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, and where noted an A-weight 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.
3. VMID decoupled with 10uF and 0.1uF capacitors (smaller values may result in reduced performance).
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.
WOLFSON MICROELECTRONICS LTD
PP Rev 1.2 April 2001
5
5 Page 
WM8729
Product Preview
DIGITAL FILTER CHARACTERISTICS
PARAMETER
Passband Edge
Passband Ripple
Stopband Attenuation
SYMBOL
Table 5 Digital Filter Characteristics
DAC FILTER RESPONSES
0
-20
-40
TEST CONDITIONS
-3dB
f < 0.444fs
f > 0.555fs
0.2
0.15
0.1
0.05
MIN
-60
TYP
0.487fs
MAX
±0.05
UNIT
dB
dB
-60
-80
-100
0
-0.05
-0.1
-0.15
-120
0 0.5 1 1.5 2 2.5
Frequency (Fs)
Figure 7 DAC Digital Filter Frequency Response
-44.1, 48 and 96kHz
0
-0.2
3 0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0.5
Frequency (Fs)
Figure 8 DAC Digital Filter Ripple -44.1, 48 and 96kHz
0.2
0
-20
-0.2
-40 -0.4
-60
-80
0 0.2 0.4 0.6 0.8 1
Frequency (Fs)
Figure 9 DAC Digital Filter Frequency Response -192kHz
-0.6
-0.8
-1
0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0.5
Frequency (Fs)
Figure 10 DAC Digital Filter Ripple -192kHz
WOLFSON MICROELECTRONICS LTD
PP Rev 1.2 April 2001
11
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