Philips Semiconductors
User Manual of High-End RDS/EON
Car Radio System CCR612 (V0.3) Application Note
96029
2 HARDWARECONFIGURATION
2.1 Block diagram CCR612
Figure 1 shows the block diagram of the high-end computer controlled RDS car radio system CCR612.
As can be seenin the block diagram, the system can either be equipped with a fixed keyboard or with a
detachablekeyboard. Thedetachable keyboardversion ofthe systemstill allowssome keysto berealised
as fixed keyboard keys. Furthermore a choice exists with respect to the following system parts:
- Power amplifier ( 2 speaker / 4 speaker / output power)
- Sound control (Potentiometer control / I2Ccontrol)
This hardware description only describes the use of the sofac TEA6320.
2.1.1 Main Board Part 1a (Basic AM/FM stereo Radio Part)
Page81 shows the circuit diagram of the basic radio part, which consist of the following parts: ICE receiver
module,audio pre-amplifier, power amplifier, power stabiliser, differential line receiver and PACS control
board.
AM/FM - ICE module (TEA6811V,TEA6822T)
The AM/FM - ICE module is a sub-board ( see paragraph 2.1.8)which comprises a two IC package (RF
ICTEA6811V and IF IC TEA6822T) and is designed especially for use in car radio’s. The module contains
the following functions;
AM receiver
FM receiver
-FM stereo decoder
-Interference Absorption Circuit (or Noise Blanker)
-Station detector and weak signal control
PLL tuning Synthesizer
I2C-Buscontrol
The complete circuit diagram of the ICE Module (version euro 1) is shown on page 89. For a detailed
description of functions and performance see Ref.4.
Audio Pre Amplifier (TEA6320)
I2C-Buscontrolled audiopre-amplifier inSOpackage forcar andhome receivers,includes Sourceselector
(forfour stereo inputs and one mono input), Loudness characteristic, Volume control, Bass control, Treble
control, Balance and Fader control.
Power Amplifier (TDA8561Q)
Carradio power amplifier with dynamic distortion detector and diagnostics in a 17 lead single in line (SIL)
plasticpower package. It contains 4 x 12W (2 ohm) and 4 x 7W (4 ohm) single-ended or 2 x 24W (4 ohm)
bridge amplifiers.
Supply voltage Stabilizer (TDA3602)
Threeoutput voltage regulator, in SIL 9 package, for use in car radios with a microprocessor. It contains
twocomputer controlled voltage regulators with foldback current protection (Regulators 1 and 2) and one
fixed voltage regulator (3) that also operates during load dump and thermal shutdown. This regulator is
used to supply the microprocessor.
13