WM8772SEDS/RV View Datasheet(PDF) - Cirrus Logic

Part Name

Description

MFG CO.

WM8772SEDS/RV

24-bit, 192kHz 6-Channel Codec with Volume Control

Cirrus Logic 

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WM8772EDS – 28 LEAD SSOP

Production Data

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 35 shows a suitable post DAC filter circuit, with 2x gain. Alternative inverting filter architectures might also be used

with as good results.

1.0nF

10uF 1.8kΩ 7.5kΩ

VOUT1L

51Ω

10kΩ

VOUT1R

VOUT2L

VOUT2R

VOUT3L

VOUT3R

680pF

4.7kΩ

4.7kΩ

OP_FIL

OP_FIL

OP_FIL

OP_FIL

OP_FIL

OP_FIL

Figure 35 Recommended Post DAC Filter Circuit

w

PD Rev 4.2 October 2005

40

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