WM8774 datasheet(39/42 Pages) WOLFSON

Part #	WM8774

Description	24 - bit, 192kHz 8 - Channel Input Stereo Codec

PDF	42 Pages

Scroll/Zoom	100%

Manufacturer	WOLFSON [Wolfson Microelectronics plc]

Direct Link	http://www.wolfsonmicro.com

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WM8774

PP Rev 1.0 June 2002

RECOMMENDED EXTERNAL COMPONENTS

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 WM8774 produces much less high frequency output noise than competitors devices). This filter is

typically also used to provide the 2x gain needed to provide the standard 2Vrms output level from

most consumer equipment. Figure 34 shows a suitable post DAC filter circuit, with 2x gain.

Alternative inverting filter architectures might also be used with as good results.

+VS

-VS

10uF

Ω

7.5K

Ω

680pF

1.8k

Ω

47k

Ω

4.7k

Ω

4.7k

Ω

1.0nF

Figure 34 Recommended Post DAC Filter Circuit

WM8774 Datasheet(PDF) 39 Page - Wolfson Microelectronics plc