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WM8727 Schematic ( PDF Datasheet ) - Wolfson Microelectronics

Teilenummer WM8727
Beschreibung 24-bit 192kHz Stereo DAC
Hersteller Wolfson Microelectronics
Logo Wolfson Microelectronics Logo 




Gesamt 16 Seiten
WM8727 Datasheet, Funktion
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24-bit 192kHz Stereo DAC
WM8727
DESCRIPTION
The WM8727 is a high performance stereo DAC designed
for audio applications such as DVD, home theatre systems,
and digital TV. The WM8727 supports data input word
lengths from 16 to 24-bits and sampling rates up to 192kHz.
The WM8727 consists of a serial interface port, digital
interpolation filters, multi-bit sigma delta modulators and
stereo DAC in a very small 8-pin SOIC package.
The WM8727 supports a 16-24-bit I2S digital audio
interface.
The WM8727 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.
FEATURES
Stereo DAC
Audio Performance
- 98dB SNR (‘A’ weighted @ 48kHz) DAC
- -84dB THD
DAC Sampling Frequency: 8kHz – 192kHz
Audio Data Interface Format
- 16-24-Bit I2S
2.7V – 5.5V Supply Operation
8-pin SOIC Package
Exceeds Dolby Class A Performance Requirements
APPLICATIONS
DVD Players
Digital TV
Digital Set Top Box
BLOCK DIAGRAM
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
W
WM8727
MCLK
VDD GND
WOLFSON MICROELECTRONICS plc
www.wolfsonmicro.com
Production Data, April 2004, Rev 4.1
Copyright 2004 Wolfson Microelectronics plc






WM8727 Datasheet, Funktion
WM8727
Production Data
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.
MASTER CLOCK TIMING
MCLK
tMCLKL
tMCLKH
tMCLKY
Figure 1 Master Clock Timing Requirements
Test Conditions
VDD = 5V, GND = 0V, TA = +25oC, fs = 48kHz, MCLK = 256fs unless otherwise stated.
PARAMETER
SYMBOL
System Clock Timing Information
MCLK Master clock pulse width high
MCLK Master clock pulse width low
MCLK Master clock cycle time
tMCLKH
tMCLKL
tMCLKY
MCLK Duty cycle
Time from MCLK stopping to power
down.
TEST CONDITIONS
MIN
8
8
20
40:60
1.5
DIGITAL AUDIO INTERFACE
tBCH
BCKIN
tBCY
tBCL
LRCIN
DIN
tDS tLRH
tLRSU
tDH
TYP
MAX
60:40
12
UNIT
ns
ns
ns
µs
Figure 2 Digital Audio Data Timing
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PD Rev 4.1 April 2004
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WM8727 pdf, datenblatt
WM8727
TYPICAL PERFORMANCE
Production Data
-65
-70
-75
-80
-85
d
B -90
r
-95
B
-100
-105
-110
-115
-120
-160
-150
-140
-130
-120
-110
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10 +0
dBFS
Figure 8 WM8727 Functionality THD+N VDD = 5V
-70
-72.5
-75
-77.5
-80
-82.5
-85
-87.5
-90
d
B -92.5
r -95
B -97.5
-100
-102.5
-105
-107.5
-110
-112.5
-115
-117.5
-120
-160
-150
-140
-130
-120
-110
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10 +0
dBFS
Figure 9 WM8727 Functionality THD+N VDD = 3V
w
PD Rev 4.1 April 2004
12

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