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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: sales@wolfson.co.uk
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.

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WM8729
PIN CONFIGURATION
LRCIN
DIN
BCKIN
MCLK
DGND
DVDD
VOUTR
AGND
1 16
2 15
3 14
4 13
WM8729
5 12
6 11
7 10
89
FORMAT
DEM
MUTEB
VREFP
VREFN
VMID
VOUTL
AVDD
Product Preview
ORDERING INFORMATION
DEVICE
XWM8729ED
TEMP. RANGE
-25 to +85oC
PACKAGE
16-pin SOIC
PIN DESCRIPTION
PIN NAME
1 LRCIN
2 DIN
3 BCKIN
4 MCLK
5 DGND
6 DVDD
7 VOUTR
8 AGND
9 AVDD
10 VOUTL
11 VMID
12 VREFN
13 VREFP
14 MUTEB
TYPE
Digital Input
Digital Input
Digital Input
Analogue Input
Supply
Supply
Analogue Output
Supply
Supply
Analogue Output
Analogue Output
Supply
Supply
Digital Bi-directional
DESCRIPTION
DAC Sample Rate Clock Input
Serial Audio Data Input
Audio Data Bit Clock Input.
Master Clock Input
Digital Ground Supply
Digital Positive Supply
Right Channel DAC Output
Analogue Ground Supply
Analogue Positive Supply
Left Channel DAC Output
Mid Rail Decoupling Point
DAC Negative Reference – normally AGND, must not be below AGND
DAC Positive Reference – normally AVDD, must not be above AVDD
Mute Control, (L = Mute on, H = Mute off, Z = Automute Enabled)
15
DEM
Digital Input
16
FORMAT
Digital Input
(Pull-Up)
Note:
Digital input pins have Schmitt trigger input buffers.
De-Emphasis Select
0 = De-Emphasis Off
1 = De-Emphasis On
Digital Audio Data Input Format Selection
0 = Right justified Audio Data
1 = I2S Audio Data
WOLFSON MICROELECTRONICS LTD
PP Rev 1.2 April 2001
2

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WM8729
Product Preview
ABSOLUTE MAXIMUM RATINGS
Absolute Maximum Ratings are stress ratings only. Permanent damage to the device may be caused by continuously operating at
or beyond these limits. Device functional operating limits and guaranteed performance specifications are given under Electrical
Characteristics at the test conditions specified.
ESD Sensitive Device. This device is manufactured on a CMOS process. It is therefore generically susceptible
to damage from excessive static voltages. Proper ESD precautions must be taken during handling and storage
of this device.
CONDITION
Digital supply voltage
Analogue supply voltage
Voltage range digital inputs
Voltage range analogue inputs
Master Clock Frequency
Operating temperature range, TA
Storage temperature
Package body temperature (soldering 10 seconds)
Package body temperature (soldering 2 minutes)
Note:
Analogue and digital grounds must always be within 0.3V of each other.
MIN
-0.3V
-0.3V
DGND -0.3V
AGND -0.3V
-25°C
-65°C
MAX
+7V
+7V
DVDD +0.3V
AVDD +0.3V
50MHz
+85°C
+150°C
+220°C
+183°C
WOLFSON MICROELECTRONICS LTD
PP Rev 1.2 April 2001
3

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WM8729
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 = 0V, DGND = 0V, TA = +25oC, fs = 48kHz, MCLK = 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 - (VREFP - (VREFP -
VREFN)/2 - VREFN)/2 VREFN)/2 +
50mV
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
Analogue Output Levels
Output level
Load = 10k ohms,
0dBFS
1.1
Load = 10k ohms,
0dBFS,
(AVDD = 3.3V)
0.726
Gain mismatch
channel-to-channel
±1
UNIT
V
V
V
V
V
ohms
Vrms
dB
dB
dB
dB
dB
dB
dB
dB
dB
VRMS
VRMS
%FSR
WOLFSON MICROELECTRONICS LTD
PP Rev 1.2 April 2001
4

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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