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TDA9725 Ver la hoja de datos (PDF) - Philips Electronics

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TDA9725 Datasheet PDF : 44 Pages
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Philips Semiconductors
Y/C automatic adjustment processor
(VHS standard)
Product specification
TDA9725
Table 1 Explanation of symbols in Figs 1 and 2
SYMBOL
AGCKP1
BGP
DOP
fH
fsc
HDL CCD
NLDE
NLEDTE
ROT
VXO
YNR
YLPF
DESCRIPTION
mode with shortened key pulse for AGC
burst gate pulse
dropout pulse
line frequency
subcarrier frequency (4.433619 MHz)
charged coupled device with 1H delay
non-linear de-emphasis
non-linear emphasis/detail enhancer
rotary pulse
voltage controlled XTAL oscillator
vertical noise reduction
luminance low-pass filter
PINNING
SYMBOL PIN
DESCRIPTION
PCTL
1 picture control/edit switch input
CDEV
2 deviation/playback AGC detector input
TP2
3 test pin 2/correlation detector output
NFB
4
negative feedback input of main
emphasis
MEO
5
main emphasis output/white
clip/modulator input/SQPB selector
CCLP3
CF0E
6 capacitor for clamp 3
7
storage capacitor for f0 processor
(record)/envelope detector (playback)
MDEC
8 main de-emphasis output
MDEB
9 main de-emphasis and peaking output
VCC(FM)
FMO
10 FM supply voltage
11 FM output
PTR
12 switch (PB/TRICK/REC)
FMI
13 playback FM input
CFMA
ELS
14 storage capacitor for FM AGC
15
PAL: switch (LP C*/LP/SP); NTSC:
switch (EP/LP/SP)
CK
16 colour killer terminal
FCO
17 frequency correction output
BGP
18 burst gate pulse output
SYMBOL PIN
DESCRIPTION
ROT
LFVXO
LFVCO
n.c.
fsc
XTALI
XTALO
2fsc
fH/2
CTT
VCC(C)
CFT
GND(C)
ACCO
BMI
SNP
CDO
CFI
TP1
PBCO
PBCI
VCC(Y)
CVBSO
CHI
CVBSI
CAGC
SYNC
CSS
YNR
VFC
VTC
CCCD
GND(Y)
LPNC
19 rotary pulse input
20 loop filter VXO
21 loop filter VCO
22 not connected; note 1
23 fsc output
24 VXO input from crystal
25 VXO output to crystal
26 2fsc output
27 fH/2 output
28 chrominance output to tape
29 chrominance supply voltage
30 playback chrominance input from tape
31 chrominance ground
32 automatic chrominance control output
33 balanced mixer input
34 switch (SECAM/NTSC/PAL)
35 comb driver output
36 chrominance input from comb filter
37 test pin 1; note 1
38 playback chrominance output
39 playback chrominance input
40 luminance supply voltage
41 CVBS output
42 character insertion input (artificial
sync/black/white/through)
43 CVBS input
44 AGC detector capacitor
45 sync separator push-pull output
46 sync separator detector capacitor
47 YNR switch
48 video input from 1HDL CCD
49 video output to 1HDL CCD
50 storage capacitor for CCD AGC level
51 luminance ground
52 low-pass filter noise canceller
Note
1. It is recommended that this pin should be connected to
ground.
1996 Oct 14
5

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