Teac EU3242ST, Service Manual

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AK45 Service Manual 01/12/2003
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SIF AGC for gain controlled SIF amplifier; single reference QSS mixer able to operate in high performance
single reference QSS mode and in intercarrier mode, switchable via I
2
C-bus
•
AM demodulator without extra reference circuit
•
Alignment-free selective FM-PLL demodulator with high linearity and low noise
•
I
2
C-bus control for all functions
•
I
2
C-bus transceiver with pin programmable Module Address (MAD).
13.13.3.Pinning
SYMBOL PIN DESCRIPTION
VIF1 1 VIF differential input 1
VIF2 2 VIF differential input 2
OP1 3 output 1 (open-collector)
FMPLL
4
FM-PLL for loop filter
DEEM 5 de-emphasis output for capacitor
AFD 6 AF decoupling input for capacitor
DGND 7 digital ground
AUD 8 audio output
TOP 9 tuner AGC TakeOver Point (TOP)
SDA 10 I
2
C-bus data input/output
SCL 11 I
2
C-bus clock input
SIOMA 12 sound intercarrier output and MAD select
n.c. 13 not connected
TAGC 14 tuner AGC output
REF 15 4 MHz crystal or reference input
VAGC 16 VIF-AGC for capacitor; note 1
CVBS 17 video output
AGND 18 analog ground
VPLL 19 VIF-PLL for loop filter
V
P
20
supply voltage (+5 V)
AFC 21 AFC output
OP2 22 output 2 (open-collector)
SIF1 23 SIF differential input 1
SIF2 24 SIF differential input 2
13.14.PI5V330
13.14.1.General Description
The PI5V330 is well suited for video applications when switching composite or RGB analog. A picture-
in-picture application will be described in this brief. The pixel-rate creates video overlays so two or more
pictures can be viewed at the same time. An inexpensive NTSC titler can be implemented by
superimposing the output of a character generator on a standard composite video background.