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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)： | 22/68頁 |
| 文件大?。?/td> | 425K |
| 代理商： | TDA4887PS |
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2001 Oct 19
22
Philips Semiconductors
Product specification
160 MHz bus-controlled monitor video
preamplifier
TDA4887PS
18. Gain control acts on video signals and inserted OSD video signals under I
2
C-bus control; subaddress 04H
(channel 1), 05H (channel 2) and 06H (channel 3; bit resolution 0.4% of gain range respectively).
19. Pedestal blanking produces an ultra black level during blanking and output clamping which is the most negative
signal at the signal output pins. The pedestal depth can be selected by bus control, subaddress 0BH. The reference
black level which should correspond to the ‘extended cut-off voltage’ at the cathodes is approximately
V
bl(n)(PED-VID)
higher (see Fig.5). The use of pedestal blanking with AC-coupled cathodes (control bit FPOL = 1) allows a very
simple black level restoration with a DC diode clamp instead of a complicated pulse restoration circuit.
20. The signal-to-noise ratio is calculated using the formula (range 1 to 120 MHz):
S
N
21. The following formula can be used to approximately determine the output rise/fall time for any input rise/fall time other
2
t
r/f (22,19,16)
t
r/f, input
1 ns
[
–
(
+
=
than 1 ns:
22. The relationship between pixel rate and signal bandwidth is f
3dB
= 0.75
×
f
pixel
, which is a compromise between
excellent and acceptable video performance. The calculation of the pixel-related rise and fall times can be done using
f
3dB
–
0.75
f
pixel
×
the formula
. Although this formula is valid for low-pass filters of first order only it is used
in most cases for simplified estimations. The pixel rate
is a good approximation for many filter types.
23. Rise and fall times depend on signal amplitude, temperature, external load, black level and supply voltage. The rise
time is affected if the top level of the signal pulse approaches the maximum output voltage level (high black level,
large signal amplitude or low supply voltage). The fall time depends on the black level (increase with decreasing
black level) and on large capacitive loads. Low-ohmic pull-down loads at the outputs helps towards smaller fall times.
Rise and fall times increase with increasing ambient (or crystal) temperature. At maximum operating temperature,
rise and fall times are approximately 0.4 ns longer than at T
amb
= 25
°
C.
24. Transient crosstalk between any two output pins:
a)
Input conditions
: any channel (channel A) with nominal input signal and 1 ns rise time. The inputs of the other
two channels (channels B) are capacitively coupled to ground. Gain setting at maximum (FFH). Contrast setting
at maximum (FFH). No limiting/modulation of contrast (V
LIM
≥
4.8 V)
b)
Output conditions
: black level set to approximately 0.7 V for each channel at signal outputs. Output signals are
V
A
and V
B
respectively
c)
Transient crosstalk suppression
:
25. Crosstalk by frequency between any two output pins:
a)
Input conditions
: any channel (channel A) with 0.2 V (p-p) sinusoidal input signal, DC-coupled to approximately
4.3 V, no input clamping. The inputs of the other two channels (channels B) are capacitively coupled to ground.
Gain setting at maximum (FFH). Contrast setting at maximum (FFH). No limiting/modulation of contrast
(V
LIM
≥
4.8 V)
b)
Output conditions
: control bit FPOL = 1, subaddress 0AH set to 01H, no pedestal blanking, nominal brightness
setting. Output signals are V
A
and V
B
respectively
c)
Crosstalk suppression
:
---
20
peak-to-peak value of the maximum signal output voltage
log
×
=
t
r/f, measured
2
2
]
2
)
t
r/f
0.35
-------0.35
=
=
f
pixel
0.75
t
r
×
-----0.35
=
α
ct(tr)
20
V
V
B
------ dB
log
×
=
α
ct(f)
20
V
V
B
------ dB
log
×
=
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