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Philips Semiconductors
User Manual of High-End RDS/EON
Car Radio System CCR612 (V0.3)
Application Note
96029
Isolator ( Differential Line Receiver, TDA8579T)
Dual common-mode rejection differential line receiver with 0 dB gain and low distortion. This device is
intended to be used to receive line inputs in audio applications that require a high level of common-mode
rejection. The device is encapsulated in an 8-pin SO or DIL package. In this set the isolator is used
between the external input and source selector input. Both the external input plug circuit and the
CD-changer input circuit are equipped with an isolator.
PACS - Sub Board (TEA6850)
PACS controls the I.F. Selectivity / Bandwidth to avoid receiving problems due to near adjacent channels
(especially for Europe, spacing of 100 kHz is not an exception). In order to show the improvements of the
selectivity and dynamic behaviour of the radio by the use of PACS an ON/OFF switch has been used on
the front panel.
A complete circuit diagram of the PACS board is shown on page 94 and for description of the functions,
alignment and performance see Ref.5.
2.1.2 Main Board Part 1b (Optional Power Amplifier, 2 x TDA8561Q)
Page 82 shows the previous circuit diagram (paragraph 2.1.1 Basic AM/FM stereo Radio Part) equipped
with circuits for 4 x 24W (4 ohm) audio output power.
Power Amplifier (2 x TDA8561Q)
Single circuit configuration 2 x 24W (4 ohm) bridge amplifiers, package SIL 17 pins Quil.
2.1.3 Main Board Part 1c (Optional Source Sel. & Audio Contr.
HEF4052B/TDA1526)
Page 83 shows the circuit diagram from paragraph 2.1.1 (Basic AM/FM stereo Radio Part) equipped with
the DC controlled audio pre-amplifier (TDA1526) and a source selector circuit (HEF4052B).This set-up
is used in case potentiometer control for volume and tone is desired.
Audio Pre-Amplifier and DC Control (TDA1526).
An active stereo,tone/volume control for car radios. It includes functions for bass and treble, control,
volume control withbuilt in contour (can be switchedoff) and balance.All these functionscan be controlled
direct by DC voltages or via single linear potentiometers.
Source selector circuit (HEF4052B).
The HEF4052Bis a dual4 channelanalogue multiplexer/demultiplexer withcommon channelselect logic.
In this case used for four stereo inputs: radio, cassette and external input.
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