25
6-4. TDA4665 ( BASEBAND DELAY LINE )
1. Feature
Tw o c o m b .filte rs,u sin g th e s w itc h e d -ca p a c ito r te ch n iq u e , fo r o n e lin e d e la y tim e .
A d ju stm e n t fre e ap p lica tio n .
N o c ro ss ta lk be tw e e n S E C A M c o lo u r ca rrie rs.
H a n d le s n e g a tiv e o r p o s itive co lo u r-d iffe re n ce in p u t sig n a ls .
C la a m p in g o f A C -co u p le d in p u t s ig n a ls ( (R -Y ) a n d (B -Y )).
V C O w ith o u t e x te rn a l c o m p o n e n ts .
3 M H z inte rn al c lo ck s ig n a l d e riv e d fro m a 6 M H z V C O , lin e -lo c ke d b y th e sa n d c a stle p u ls e (6 4 u S lin e )
S a m p le -a n d -h o ld circ u its a n d lo w p a s s filte rs to su p p re ss th e 3 M H z c lo c k sig n a l.
A d d itio n o f d ela ye d a n d n o n -d e la y e d o u tpu t s ig n a ls .
O u tp u t bu ffe r a m p lifie rs.
C o m b . filte rin g fu n ctio n s for N T S C c o lo u r-d iffe re n c e s ig n a ls to s u pp re s s cro s s-c o lo u r.
2. General Description
T h e T D A 4 6 6 1 is a n in teg ra ted b a se b a n d de lay lin e c ircu it w ith o n e lin e d e la y. It is s u ita b le fo r
d e c o d e rs w ith c o lo u r-d iffe re n c e s ig n a l o u tpu ts (R -Y ) a n d (B -Y ).
3. Block Diagram
4. Pin Description
S Y M B O L
PIN
D E SC R IP T IO N
SY M B O L
PIN
D E SC R IP T IO N
Vp
1
+5V supply voltage for digital part
Vp© ¸
9
+5V supply voltage for analog part
nc
2
not connected
G N D 1
10
ground for digital part(0V)
G N D 2
3
ground for digital part(0V)
Vo(R -Y)
11
(R -Y) output signal
i.c.
4
internally connected
Vo(B -Y)
12
(B-Y) output signal
SAN D
5
sandcastle pulse input
nc
13
not connected
nc
6
not connected
Vi(B-Y)
14
(B-Y) input signal
i.c
7
internally connected
nc
15
not connected
i.c
8
internally connected
Vi(R -Y)
16
(R -Y) input signal
Summary of Contents for MV1421
Page 1: ...SERVICE MANUAL MV1421 1422 4822 34cm 48cm Televideo Effective December 1999 MV4822SERV ...
Page 6: ...4 3 BLOCK DIAGRAM 3 1 Audio Signal Flow ...
Page 7: ...5 3 2 Video Signal Flow ...
Page 8: ...6 3 3 TV and monitor power switching ...
Page 22: ...20 3 Block Diagram ...
Page 53: ......
Page 54: ......
Page 55: ......
Page 117: ...2 Main PCB Assy Circuit Diagram SECTION BEFORE AFTER MAIN TUNER ...
Page 118: ...3 SECTION BEFORE AFTER SUB TUNER ...
Page 125: ...10 Exploded View MV1421 model ...
Page 126: ...11 Exploded View MV1422 model ...
Page 127: ...12 Exploded View MV4822 model ...
Page 128: ...13 Exploded View DVT 20F9 model ...
Page 129: ...14 Exploded View DVT 21F1 model ...
Page 130: ...15 Exploded View DVT 21F2 model ...
