WM8778SEDSSLASHR datasheet(48/50 Pages) WOLFSON

Part #	WM8778SEDS/R

Description	24 BIT 192KHZ STEREO CODEC

PDF	50 Pages

Scroll/Zoom	100%

Manufacturer	WOLFSON [Wolfson Microelectronics plc]

Direct Link	http://www.wolfsonmicro.com

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48 / 50 page

WM8778

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PP Rev 1.7 June 2004

APPLICATIONS INFORMATION

RECOMMENDED EXTERNAL COMPONENTS

It is recommended that a low pass filter be applied to the output from the DAC 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

WM8778 produces much less high frequency output noise). 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

10k

Ω

4.7k

Ω

4.7k

Ω

1.0nF

Figure 38 Recommended Post DAC Filter Circuit

WM8778SEDS/R Datasheet(PDF) 48 Page - Wolfson Microelectronics plc