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參數(shù)資料
| 型號： | TDA4887PS |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 160 MHz bus-controlled monitor video preamplifier |
| 中文描述： | 3 CHANNEL, VIDEO PREAMPLIFIER, PDIP24 |
| 封裝： | 0.400 INCH, PLASTIC, SDIP-24 |
| 文件頁數(shù)： | 47/68頁 |
| 文件大?。?/td> | 425K |
| 代理商： | TDA4887PS |
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2001 Oct 19
47
Philips Semiconductors
Product specification
160 MHz bus-controlled monitor video
preamplifier
TDA4887PS
12.4.2
B
LACK LEVEL RESTORATION
Figure 24 shows two simple circuits for black level
restorationforapplicationswithAC-coupledcathodes.The
output signal of the post amplifier is coupled via a 1
μ
F
capacitor and a 68
resistor to the cathode. The cathode
voltage is clamped (peak responding) to the DC voltage
V
cl
= V
b
+ V
BE
viadiodeD1.ThevoltageV
b
isderivedfrom
the bus controlled reference voltage V
ref
(pin FB/R
(n)
of
TDA4887PS) by resistor network R1 to R2.
for the upper circuit.
for the lower circuit.
The upper circuit has much less temperature dependence
on clamp voltage and, in the event of an I
2
C-bus Power-on
reset in TDA4887PS, all clamp voltages go to black.
For correct clamping, a well-defined top level of V
sig
is
necessary(pedestalblacklevelhastobethemostpositive
voltage).
When using internal brightness control, pedestal blanking
(subaddress 0BH) has to be larger than minimum possible
brightness setting (10% of maximum signal swing if the
complete range is used). With 40 V maximum signal swing
and 15% pedestal blanking, the clamping voltage V
cl
has
to be 6 V higher than the extended cut-off voltage.
Without using internal brightness control, at least 5%
pedestal blanking is recommended.
V
b
V
a
R1
R2
+
R1
×
=
V
b
V
p1
V
a1
V
be
–
(
)
R1
R2
×
–
=
handbook, full pagewidth
MHB955
1
μ
F
1
μ
F
VIDEO
BOOSTER
amplification
≈
13
68
100 V
Vp1
Vsig
Vref
R2
150 k
D1
BAW62
BAV21
R1
10 k
1 M
Vcl
cathode
amplification
≈
15
BC546
TDA4887PS
1
μ
F
1
μ
F
VIDEO
BOOSTER
amplification
≈
13
68
Re
560
8 V
90 V
Vp2
Vp1
Vsig
Vcl
Vb
Va1
Va
Vb
Vref
R2
150 k
Rc
22 k
D1
BAW62
BAV21
R1
12 k
1 M
cathode
amplification
≈
13.5
2
×
BC546
TDA4887PS
Fig.24 Black level restoration circuits.
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