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參數(shù)資料
| 型號： | TEA2028-TEA2029 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | APPLICATION NOTE |
| 中文描述： | 應(yīng)用筆記 |
| 文件頁數(shù)： | 7/47頁 |
| 文件大?。?/td> | 532K |
| 代理商： | TEA2028-TEA2029 |
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Sync
Level
t
S’
V
PP
Black
Level
Video
Input
Signal
Composite Sync.
OutputSignal
T
H
t
r
FrameSync.
2
Figure5
V.2.1 - Black level locking
27
CC
V
+
I
C
+
I
D
I
D
= constant
I
C
V
N
= 2V
V
S1
V
P
V
C27
V
PP
C1
-14
V
N
= 2V
I
C
Video
2
Figure6
The video signal is applied to Pin 27 through the
coupling capacitor ”C27”. Since the sync pulse
amplitudeisgenerallyequalto 1/3ofV
PP
(i.e.66mV
to 1V)and inorderto obtaina goodprecisionofthe
black level, the sync pulse should be amplified by
a coefficient of - 14 before being applied to the
comparator”C1”.
This comparatorwill chargethe ”C27” capacitoras
long asV
S1
>V
N
V
S1
willstabilizeat V
N
duringthe
line flyback interval ”T
r
” if the average charge of
”C27” capacitor is nil for one T
H
period.
I
C
/I
D
is calculated such that the locking occurs at
the middle of the back porch.
0
t
t
V
S1
I
C
-5
μ
A
t
S
t
r
V
S1
V
N
(2V)
t
1
t
r
t
S
2
=
+
t
S
2
Figure7
The
V
S1
producedbyI
D
duringthelinetracewhich
is : 14
I
D
t
A
C27
mustbe equal to
V
S1
duringthe time interval”t1”,
i.e. : 14
I
C
t
1
C27
It follows that :I
C
t
1
=
t
S
+
t
R
t
S
I
D
=t
A
T
H
t
R
2
substitutingT
H
=64
μ
s, t
r
=12
μ
s, t
S
=4.7
μ
s(which
are standard and constant values) into above
equation:I
C
I
D
= 6.23V
V.2.1.1 - Application
At I
C
= 5
μ
A
I
D
= 31
μ
A
- With C27 = 220nF,
V
S
will be
14
5
52
220
= 16mV
which yields 0.8% maximum error in black level
withrespecttoV
N
=2Vat thebeginningofretrace
time
- Due to transpositiononamplifier stage, the black
level voltageon Pin 27 is equalto 2V.
TEA2028 - TEA2029 APPLICATIONNOTE
7/46
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