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WM8768EDS/R Datasheet(PDF) 36 Page - Wolfson Microelectronics plc

No. de pieza WM8768EDS/R
Descripción Electrónicos  24-bit, 192kHz 8-Channel DAC
PDF  38 Pages
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Fabricante Electrónico  WOLFSON [Wolfson Microelectronics plc]
Página de inicio  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM8768EDS/R Datasheet(HTML) 36 Page - Wolfson Microelectronics plc

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WM8768
Production Data
w
PD Rev 4.1 March 2005
36
SUGGESTED ANALOGUE LOW PASS POST DAC FILTERS
It is recommended that a lowpass filter be applied to the output from each DAC channel for Hi Fi
applications. Typically a second order filter is suitable and provides sufficient attenuation of high
frequency components (the unique low order, high bit count multi-bit sigma delta DAC structure used
in WM8768 produces much less high frequency output noise than normal sigma delta DACs. This
filter is typically also used to provide the 2x gain needed to provide the standard 2Vrms output level
from most consumer equipment. Figure 32 shows a suitable post DAC filter circuit, with 2x gain.
Alternative inverting filter architectures might also be used with as good results.
7.5k
Ω
Ω
Ω
Ω
1.8k
Ω
Ω
Ω
Ω
10uF
1.0nF
47k
Ω
Ω
Ω
Ω
4.7k
Ω
Ω
Ω
Ω
680pF
4.7k
Ω
Ω
Ω
Ω
51
OP_FIL
VOUT1L
OP_FIL
VOUT1R
OP_FIL
VOUT2R
OP_FIL
VOUT2L
OP_FIL
VOUT3L
OP_FIL
VOUT3R
OP_FIL
VOUT4L
OP_FIL
VOUT4R
Figure 32 Recommended Post DAC Filter Circuit



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