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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)： | 20/68頁 |
| 文件大?。?/td> | 425K |
| 代理商： | TDA4887PS |
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2001 Oct 19
20
Philips Semiconductors
Product specification
160 MHz bus-controlled monitor video
preamplifier
TDA4887PS
Notes to the characteristics
1.
Definition of levels (see Figs 3 to 5)
Reference black level
:this is the level to which the input level is clamped during the input clamping pulse
(V
CLI
> 3.5 V). It is used internally as a reference for the gain settings. It can be observed on the outputs:
a) When the input is at black and the brightness setting is nominal (subaddress 01H = 40H) or control bit BRI = 1
b) During output blanking and clamping (V
HFB
> 3.5 V) if the pedestal blanking depth is set to zero
(subaddress 0BH = 00H).
Video black level
:this is the black level of the actual video. At the input it is still equal to the reference black level.
At the output it may deviate from it according to the brightness setting. Contrast setting leaves the video black level
unaltered. Gain setting biases the video black level due to its influence on brightness. This is important for correct
grey scale tracking. It can be observed at the outputs when the input is at black outside output blanking and clamping
pulses (V
HFB
< 0.8 V).
Pedestal black level
: this is anultra black level which deviates from the reference black level by a bus controlled
amount. It can be observed at the output during output blanking and clamping (V
HFB
> 3.5 V; subaddress
0BH
≠
00H).
Switch-off voltage
: this is the lowest signal voltage at outputs. The signals will be switched off by discharging the
internal black level storage capacitors if the supply voltage is less than V
P(SO)
. It can be observed at the outputs when
the input is at black, the brightness setting is nominal and V
P
< 6.8 V (subaddress 01H = 40H).
Blanking level
: this level equals reference black (subaddress 0BH 1= 00H) or pedestal black. It can be observed at
the outputs during output blanking and clamping (V
HFB
> 3.5 V).
2.
Explanation to black level adjustment:
The three reference black levels are aligned correctly when they are made equal to the ‘extended cut-off levels’ of
the three cathodes. Full raster and spot cut-off can only be achieved by enabling the pedestal blanking or by applying
a negative pulse to the grid G1.
Negative feedback for DC-coupled cathodes (control bit FPOL = 0):
the actual blanking level on the outputs
depends on the external feedback application for output clamping. The loop will function correctly only if it is within
the control range of V
bl(n)(ref)(min)
to V
bl(n)(ref)(max)
at pins 22, 19 and 16. It should be noted that changing pedestal
blanking in a given application will not affect the blanking level, but instead shifts the video (and needs re-alignment
of the three black levels).
Positive feedback for AC-coupled cathodes (control bit FPOL = 1):
the feedback loop for output clamping is
closed internally. The actual blanking level is bus controlled between 0.53 and 1.89 V (subaddress 0AH). It should
be noted that changing pedestal blanking will not affect the blanking level, but instead shifts the video (and
re-alignment of the three black levels is needed).
3.
Definition of output signals (see Fig.6):
Colour signal
: all positive voltages are referenced to black level at signal outputs.
Maximum colour signal
: colour signal with nominal input signal 0.7V
i(b-w)
, maximum contrast setting and maximum
gain setting.
Video signal
: all positive voltages referred to reference black level at signal outputs. The video signal is the
superimposing of the brightness information (
V
bl
) and the colour signal.
4.
The total supply current I
P(tot)
= I
P
+ I
P1
+ I
P2
+ I
P3
depends on the supply voltage with a factor of approximately
4.4 mA/V and varies in the temperature range from
20 to +70
°
C by approximately
±
5% (V
O(n)
= 0.7 V).
5.
The channel supply current I
P1
, I
P2
, I
P3
depends on the signal output current I
O1
, I
O2
, I
O3
, the channel supply voltage
V
P1
, V
P2
, V
P3
and the signal output voltage V
O1
, V
O2
, V
O3
. With I
Px
= I
P(n)
at I
O(n)
= 0, V
P(n)
= 8 V and V
O(n)
= 0.7 V:
I
P(n)
I
Px
I
O(n)
4.4 mA/V
V
P(n)
8 V
–
(
)
×
1 mA/V
(
×
–
+
+
≈
V
O(n)
0.7 V
–
)
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