wm8400 Wolfson Microelectronics plc, wm8400 Datasheet - Page 95

• Manufacturer Part Number: wm8400
• Description: Wolfson Audioplustm Hi-fi Audio Codec And Power Management Unit For Mobile Multimedia
• Manufacturer: Wolfson Microelectronics plc

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Pre-Production
Figure 39 Stereo Line Out (A)
Figure 41 Stereo Line Out (B)
LINE OUTPUT CONFIGURATIONS
The line outputs LON, LOP, RON and ROP are each driven by different output mixers as described
below.
The LOP and ROP pins output a mix of LIN12 input PGA, RIN12 input PGA and either LOMIX or
ROMIX outputs.
The LON output is a mix of ROMIX, LOMIX and a phase-inverted copy of LOP.
The RON output is a mix of LOMIX, ROMIX and a phase-inverted copy of ROP.
Volume control of LOMIX and ROMIX is available in all cases above via LOPGA and ROPGA. An
additional -6dB attenuation option is provided on LOP and ROP outputs.
The outputs LON, LOP, RON and ROP are capable of driving line loads only. Single ended output is
possible on all these output simultaneously. Differential output is also possible between LOP and
LON and between ROP and RON.
Typical applications for the line outputs (single-ended or differential) are:
Some example line output configurations are shown below.
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Handset or headset microphone output to external voice CODEC
Stereo line output
Output to external speaker driver(s) to support stereo loudspeakers
Figure 40 Differential Output of MIC PGA
Figure 42 Differential Output to Speaker Driver
PP, April 2009, Rev 3.0
WM8400
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