Teac MV1421, Руководство по обслуживанию

Страница: 28 / 130

26
6-5. TDA8395 ( SECAM DECODER )
1. Feature
F u lly in te g ra te d filte rs.
A lig n m e n t fre e .
F o r us e w ith b a s e b a n d d e la y.
2. Description
T h e T D A 8 3 9 5 is a s e lf-c a lib ratin g , fu lly in te g ra te d S E C A M d e co d e r.T h e IC s h o u ld p re fe ra b ly b e u s e d
in co n ju n c tion w ith th e PA L /N T S C d ec o d e r T D A 83 6 2 a n d w ith th e sw itch ca p a c ito r b a s e b a n d d e la y
c ircu it T D A 4 6 6 5 . T h e IC in co rp o ra te s H F a nd L F filte rs , a d e m od u la to r a n d a n id e n tifica tio n c ircu it
(lu m ina n c e is n ot p ro c e ss e d in th is IC )
A h ig h ly s ta b le re fe re n ce fre q u e nc y is re q u ire d fo r ca lib ra tio n a n d a tw o -le ve l s a nd c a s tle p ulse fo r
b la n k in g a n d bu rs t g a tin g .
3. Block Diagram
4. Pin Description
S YM BO L P IN D E SC R IPTIO N S YM BO L P IN D E SC R IPTIO N
Fref/ident 1 reference freq. input/ident input. -(R -Y) 9 -(R -Y) output
TEST 2 test output -(B-Y ) 10 -(B-Y) output
Vp 3 positive supply voltage nc 11 not connected
nc 4 not connected nc 12 not connected
nc 5 not connected nc 13 not connected
G N D 6 ground nc 14 not connected
C LO C H 7 C loch reference filter SAN D 15 sandcastle pulse input
PLLref 8 PLLreference C VBS 16 video(chrom inance)input
BANDGAP T UNIN G TUNING
ACC
CLOCHE
FILTER
PLL
DE-
EM PHASIS
INTERFACE CO NTRO L
IDENT -
IFICATION
OUTPUT
ST AG E
CLO CHE
ref
PLL
ref
GND
220 nF 1 00 nF
V
p
T EST
CVBS
16
7 8 3 6 2
1 15
f
ref
/IDENT
SAND
9
10
(R-Y)
(B-Y)
TDA8395