WM8776SEFT/V Wolfson Microelectronics, WM8776SEFT/V Datasheet - Page 55

• Manufacturer Part Number: WM8776SEFT/V
• Description: Audio CODECs Stereo CODEC with 5-Ch Mux
• Manufacturer: Wolfson Microelectronics

Specifications of WM8776SEFT/V

• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: TQFP-48
• Minimum Operating Temperature: - 25 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Production Data
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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
WM8776 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 44 shows a suitable post DAC filter circuit, with 2x gain. Alternative inverting filter
architectures might also be used with as good results.
Figure 44 Recommended Post DAC Filter Circuit
+
10uF
10kΩ
1.8kΩ
1.0nF
4.7kΩ
7.5KΩ
4.7kΩ
680pF
_
+
+VS
-VS
PD, Rev 4.1, September 2008
51Ω
WM8776
55