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PDF WM8727 Data sheet ( Hoja de datos )
| Número de pieza | WM8727 | |
| Descripción | 24-bit 192kHz Stereo DAC | |
| Fabricantes | Wolfson Microelectronics | |
| Logotipo |  |
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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
1 page  
WM8727
Production Data
ELECTRICAL CHARACTERISTICS
Test Conditions
VDD = 5V, GND = 0V, TA = +25oC, fs = 48kHz, MCLK = 256fs unless otherwise stated.
PARAMETER
SYMBOL TEST CONDITIONS
MIN
Digital Logic Levels (TTL Levels)
Input LOW level
VIL
Input HIGH level
VIH
2
Output LOW
VOL IOL = 2mA
Output HIGH
DAC Output (Load = 10kΩ 50pF)
VOH
IOH = 2mA
0.9 x VDD
0dBFs Full scale output voltage
At DAC outputs
SNR (Note 1,2)
SNR (Note 1,2)
SNR (Note 1,2)
SNR (Note 1,2)
SNR (Note 1,2)
SNR (Note 1,2)
THD
Dynamic range (Note 2)
Analogue Output Levels
Output level
Gain mismatch
channel-to-channel
Minimum resistance load
Maximum capacitance load
Output d.c. level
Power On Reset (POR)
POR threshold
A-weighted,
@ fs = 48kHz
A-weighted
@ fs = 96kHz
A-weighted
@ fs = 192kHz
A-weighted,
@ fs = 48kHz
VDD = 3.3V
A-weighted
@ fs = 96kHz
VDD = 3.3V
Non ‘A’ weighted @ fs
= 48kHz
1kHz, 0dBFs
1kHz, THD+N @
-60dBFs
Load = 10kΩ, 0dBFS
Load = 10kΩ, 0dBFS,
(VDD = 3.3V)
To midrail or a.c.
coupled
To midrail or a.c.
coupled
(VDD = 3.3V)
5V or 3.3V
TYP
1.2 x
VDD/5
98
95
92
95
95
92
-84
98
1.2
0.79
±1
1
1
100
VDD/2
1.8
MAX
0.8
0.10 x VDD
UNIT
V
V
V
V
VRMS
dB
dB
dB
dB
dB
dB
dB
dB
VRMS
VRMS
%FSR
kΩ
kΩ
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. Power down occurs 1.5µs after MCLK stops.
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PD Rev 4.1 April 2004
5
5 Page 
WM8727
Production Data
DIGITAL FILTER CHARACTERISTICS
PARAMETER
Passband Edge
Passband Ripple
Stopband Attenuation
SYMBOL
Table 2 Digital Filter Characteristics
DAC FILTER RESPONSES
0
-20
TEST CONDITIONS
-3dB
f < 0.444fs
f > 0.555fs
0.2
0.15
0.1
-40 0.05
MIN
-60
TYP
0.487fs
MAX
±0.05
UNIT
dB
dB
-60 0
-0.05
-80
-0.1
-100
-0.15
-120
0 0.5 1 1.5 2 2.5
Frequency (Fs)
Figure 4 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 5 DAC Digital Filter Ripple -44.1, 48 and 96kHz
0.2
0
-20
-0.2
-40 -0.4
-0.6
-60
-80
0
0.2 0.4 0.6 0.8
Frequency (Fs)
1
-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 6 DAC Digital Filter Frequency Response – 192kHz Figure 7 DAC Digital Filter Ripple –192kHz
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PD Rev 4.1 April 2004
11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet WM8727.PDF ] | |
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