Combo Memory; Audio Concept; Audio Hw Architecture - Nokia n81 Service Manual

RM-179; RM-223
System Module and User Interface
• 32.768kHz clock with external crystal
• Real time clock with external backup battery
• SIM card interface
• Stereo audio codecs and amplifiers
• A/D converter
• Regulators
• Vibra interface
• Digital interface (CBUS)
EMC ASIP (Appcation Specified Integrated Passive) have been integrated inside the ASIC. It includes biasing
passives for microphone , EMC filter for SIM, microphones etc.

Combo memory

The application memory of the device consists of NAND/DDR combo memory. The stacked DDR/NAND
application memory has 768 Mbit of DDR memory and 1 Gbit of flash memory.

Audio concept

Audio HW architecture

The functional core of the audio hardware is built around the two ASICs Rapido engine and mixed signal ASIC
AVILMA.
AVILMA provides an interface for the transducers and accessory connector. Integrated handsfree stereo
speakers are driven by a Class-D audio amplifier TPA2012D2 (second source LM4674A). An audio DAC AIC33
and audio amplifier TPA6130A2 (or second source TS4601) are used to supply HiFi audio signals to external
headphone/headset.
The audio transducers are:
• Dynamic earpiece (located on slider)
• Two dynamic speakers
• Digital microphone
In addition to the audio transducers, AVILMA also provides an output for the dynamic vibra component.
All galvanic audio accessories are connected to AV accessory connector.
A Bluetooth audio and FM-radio module, connected to Rapido, AVILMA and AIC33 supports Bluetooth audio
and radio functionality.
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