wm8400 Wolfson Microelectronics plc, wm8400 Datasheet - Page 57

• 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
All eight analogue input pins may be configured as line inputs. Various signal paths exist to provide
flexibility, high performance and low power consumption for different usage modes.
LIN1 and RIN1 can operate as line inputs to the Input PGAs LIN12 and RIN12 to provide high gain if
required for small input signals.
LIN2 and RIN2 can operate as line inputs directly to the input mixers or to the speaker output mixer.
Direct routing to the speaker output minimises power consumption by reducing the number of active
amplifiers in the signal path.
LIN3 and RIN3 can operate as line inputs to the Input PGAs or as a line input directly to either of the
output mixers LOMIX and ROMIX.
LIN1+LIN3 and RIN1+RIN3 can also be used as fully balanced differential inputs via the Input PGAs
to one of the input mixers. (Note that these inputs have matched input impedances.)
LIN4/RXN and RIN4/RXP can operate as line inputs directly to the outputs OUT3 and OUT4,
providing an ultra-low power stereo or mono differential signal path (e.g. from an external voice
CODEC) to an ear speaker. LIN4/RXN and RIN4/RXP can also operate as a mono differential input
to the ADC input signal path and output mixer stages.
LINE INPUTS
Figure 22 LIN1 or RIN1 as Line Inputs
Figure 24 LIN3 or RIN3 as Line Inputs
Figure 23 LIN2 or RIN2 as Line Inputs
Figure 25 Fully Balanced Differential Input
PP, April 2009, Rev 3.0
WM8400
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