Sony CMD-J5 - Manual (Page 19)

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IC 2
IC 2 is the platform of the A/D-D/A converter for the interfacing and processing of baseband I/Q signals and voice
signals.
It includes:
the complete set of baseband functions to perform the interface and processing of voice signals,
interface for processing of baseband components as In Phase (I) and Quadrature (Q) signals which support
single slot and multi slot mode,
associated auxiliary RF control features,
supply voltage regulation,
battery charging control and
switch ON/OFF system analysis.
Further, IC 2 includes also on chip voltage reference, under voltage detection and power -on reset circuits.
IC 2 interfaces with the digital baseband device through a set of digital interfaces dedicated to the main functions
of IC 1:
1. A baseband serial port (BSP) and a voiceband serial port (VSP) to communicate with the DSP.
2. A micro- controller serial port (USP) to communicate with the micro contoller core of IC 1.
3. A time serial port (TSP) to communicate with the processing unit for real time control.
6.3 Block Diagram - Audio
6.3.1 General Audio Indications
Multiactor (Loudspeaker /Ringer Vibrator)
This device is a combined electrodynamic vibration exciter with an additional membrane to improve frequency
response and enhance ringer level.
The system is tuned to the vibration frequency around 130 Hz.
Headset Connector (Headphone Jack)
The headset is connected directly to the circuit to the built in microphone and earpiece. The connector is a 4-pole
jack with 2 switches.
IC 1
IC 2