WM8772 datasheet(38/70 Pages) WOLFSON

Numer części	WM8772

Szczegółowy opis	24 BIT 192KHZ 6 CHANNEL CODEC WITH VOLUME CONTROL

PDF	70 Pages

Scroll/Zoom	100%

Producent	WOLFSON [Wolfson Microelectronics plc]

Strona internetowa	http://www.wolfsonmicro.com

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38 / 70 page

WM8772EDS – 28 PIN SSOP

Production Data

PD Rev 4.1 October 2004

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 WM8772EDS 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 31 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

1.8k

Ω

10uF

1.0nF

10k

Ω

4.7k

Ω

680pF

4.7k

Ω

OP_FIL

VOUT1L

OP_FIL

VOUT1R

OP_FIL

VOUT2R

OP_FIL

VOUT2L

OP_FIL

VOUT3L

OP_FIL

VOUT3R

Figure 31 Recommended Post DAC Filter Circuit

WM8772 Arkusz danych(PDF) 38 Page - Wolfson Microelectronics plc