Service manual

PinDescriptions
SupplyPins
VSUP1.8DIG
− Supply Voltage 1.8 V
This pin is main and standby supply for the digital core
logic of controller, video, display and deflection pro-
cessing.
VSUP1.8FE − Supply Voltage 1.8 V
This pin is main supply for the analog video front-end.
VSUP3.3FE − Supply Voltage 3.3 V
This pin is main supply for the analog video front-end.
VSUP3.3IO − Supply Voltage 3.3 V
This pin is main and standby supply for the digital I/O-
ports.
VSUP3.3DIG − Supply Voltage 3.3 V
This pin is main supply for the digital core logic of IF
and audio processing and digital video back-end.
VSUP3.3BE − Supply Voltage 3.3 V
This pin is main supply for the analog video back-end.
VSUP5.0BE − Supply Voltage 5.0 V
This pin is main supply for the analog video back-end.
VSUP8.0AU − Supply Voltage 8.0 V
This pin is main supply for the analog audio process-
ing.
GND − Ground Platform
This pin is main ground for all above supplies.
VSUP3.3DAC − Supply Voltage 3.3 V
This pin is main supply for the video DACs.
GNDDAC − Ground for 3.3 V Video DAC Supply
VSUP5.0IF − Supply Voltage 5.0 V
This pin is main supply for the analog IF front-end.
GNDIF − Ground for 5.0 V IF Supply
VSUP3.3EIO − Supply Voltage 3.3 V
This pin is main and standby supply for the extended
digital I/O-ports available in QFP package only. It is
internally connected to
VSUP3.3IO.
GNDEIO
− Ground for 3.3 V Extended I/O Supply
It is internally connected to GND.
Application Note:
All GND pins must be connected to a low-resistive
ground plane underneath the IC. All supply pins must
be connected separately with short and low-resistive
lines to the power supply. Decoupling capacitors from
VSUPxx to GND have to be placed as closely as pos-
sible to these pins. It is recommended to use more
than one capacitor. By choosing different values, the
frequency range of active decoupling can be extended.
IFPins
VREFIF
− Reference Voltage for Analog IF (Fig. 4–9)
This pin must be connected to
GNDIF via a circuitry
according to the application circuit. Low inductance
caps are necessary.
IFIN+, IFIN- − Balanced IF Input (Fig. 4–6)
These pins must be connected to the SAW filter out-
put. The SAW filter has to be placed as close as possi-
ble. The layout of the IF input should be symmetrical
with respect to
GNDIF.
SIF − 2nd Sound IF Output (Fig. 4–8)
Output level is set via I
2
C-Bus. An appropriate sound
processor (e.g. MSP) can be connected to this pin.
This pin is also configurable as audio input (see
Fig. 4–10).
TAGC − Tuner AGC Output (Fig. 4–7)
This pin controls the delayed tuner AGC. As it is a
noise-shaped-I-DAC output, it has to be connected
according to the application circuit.
AudioPins
VREFAU
– Reference Voltage for Analog Audio (Fig.
4–14)
This pin serves as the internal ground connection for
the analog audio circuitry. It must be connected to the
GND pinwitha3.3µF and a 100 nF capacitor in paral-
lel. This pins shows a DC level of typically 3.77 V.
AIN1 L – Audio 1 Inputs (Fig. 4–10)
The analog input signal for audio 1 is fed to this pin.
Analog input connection must be AC coupled.
AIN1 R – Audio 1 Inputs (Fig. 4–10)
The analog input signal for audio 1 is fed to this pin.
Analog input connection must be AC coupled. This pin
is also configurable as sound IF output (see Fig. 4–8).
AIN2 R/L – Audio 2 Inputs (Fig. 4–10)
The analog input signal for audio 2 is fed to this pin.
Analog input connection must be AC coupled.
AIN3 R/L – Audio 3 Inputs (Fig. 4–10)
The analog input signal for audio 3 is fed to this pin.
Analog input connection must be AC coupled.
CIRCUIT DESCRIPTIONS CIRCUIT DESCRIPTIONS CIRCUIT DESCRIPTIONS CIRCUIT DESCRIPTIONS CIRCUIT DESCRIPTIONS