Teac MV1421, Service Manual

Page: 21 / 130

19
6-3. TDA8374A( Single chip TV Processor for Negative modulation IF )
1. General Description
T h e T D A 8 3 7 4 A is IIC B U S co n tro lled sin g le c h ip T V p ro c es s o rs w h ic h a re in te n d e d to b e
a p p lie d in PA L /N T S C te le visio n re c e iv e r.
T D A 8 3 7 4N 3 : W ith p o s itive a n d n e g a tiv e m o d u la tio n
A p p lie d in PA L /S E C A M /N T S C T V.
2. Feature
•
IF
- V is io n IF a m p lifie r w ith h ig h s e n sitiv ity a n d g oo d fig u re s fo r d iffe re ntia l p ha s e a n d a g a in .
- PLL demodulator with high linearity offering the possibility for (single standard) intercarrier stereo audio application.
- A lig n m e n t P L L v ia IIC
•
V ID E O
- In te g ra te d lu m in a n c e d e la y lin e
- In te g ra te d ch ro m a tra p a n d b a n d p a s s filte rs (a u to c a lib ra te d )
- A s ym m e tric a l p e a k in g c ircu it in th e lu m in a n c e c h a n ne l.
- B la c k stretc hin g o f n o n s ta n d a rd C V B S o r lu m ina n c e s ig n a ls .
•
C O L O U R
- S E C A M in te rfa c e fo r a p p lic atio n w ith S E C A M a d d -o n T D A 8 3 95 .
•
R G B
- R G B c o n tro l (b rig h tn e s s,c o ntra st,s a tu ra tio n .
- B la c k cu rre n t sta biliz a tio n a n d w h ite p o in t a d ju s tm e n t.
•
IN P U T /O U T P U T
- F le xib le v id e o s o urc e s e le c t w ith C V B S in p u t fo r th e in te rn a l s ig n a l a n d tw o e x te rn a l v id e o in p u ts
(o n e s w itc h a b le fo r C V B S or Y /C )
- T he o utp ut sig na l o f th e vide o so urce sele ct is e xte rn ally av aila ble (a lso as C V B S w he n Y /C in pu t is us ed .)
- E x te rn a l a u d io in p ut
- L ine a r R G B in p u t w ith fa s t b la n k in g .
•
S Y N C H R O N IZ AT IO N A N D D E F L E C T IO N
- H o riz o nta l sy n ch ro n iz a tio n w ith tw o c on tro l lo o p s a n d a lig n m e n t fre e h o riz o n ta l os cilla tor.
- S lo w s ta rt a n d s lo w s to p o f th e h o riz o nta l d riv e o u tp u t to e n a b le lo w s tre ss s ta rt-u p a n d
s w itc h -o ff fro m th e lin e c irc u it a t n o m in a l lin e s u pp ly vo lta g e .
- Ve rtic a l c o u n t d o w n circ u it fo r s ta b le b e h av io r w ith p ro visio n s fo r n o n s ta n d a rd s ig n a ls.
- Ve rtic a l g e o m e try c o n tro l
- Ve rtic a l d riv e o p tim iz e d fo r D C co u p le d v e rtic a l o u tp u t sta g e s.
•
C O N T R O L
- F u ll IIC B U S co n tro l, a s w e ll fo r cu s to m e r co n tro ls a s fo r fac to ry a lign m e n t.
- A ll a u to m a tic c o ntro ls h a ve a n o p tion fo r fo rce d m o d e .
•
P O W E R C O N S U M P T IO N
- L o w po w e r c o n su m p tio n (9 0 0 m W a t 8 .0 Vo lts).
•
PA C K A G IN G
- S D IL -5 6 ( S h rin ke d D u a l In L in e , 5 6p ins )