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參數(shù)資料
| 型號(hào)： | TDA4887 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | 160 MHz bus-controlled monitor video preamplifier |
| 中文描述： | 160 MHz的總線控制顯示器的視頻前置放大器 |
| 文件頁數(shù)： | 48/68頁 |
| 文件大小： | 425K |
| 代理商： | TDA4887 |
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2001 Oct 19
48
Philips Semiconductors
Product specification
160 MHz bus-controlled monitor video
preamplifier
TDA4887PS
12.4.3
A
VOIDING NEGATIVE INPUT VOLTAGES AT BLANKING
AND CLAMPING INPUT PINS
Negative voltages on any input pin causes ESD protection
diodes and other internal junctions will become
open-circuit resulting in substrate current injection.
Substrate currents can generate parasitic effects that are
not completely predictable. Signal inputs (pins 6 and 10)
are neighbouring clamping inputs (pins 5 and 11) and can
therefore suffer from larger leakage currents during
negative clamping pulse glitches. An internal circuit in
combination with an external resistor protects the pins
from negative voltages (see Fig.25).
At pin voltages near to ground level, the voltage difference
between the internal reference voltage V
ref
and the base
voltage of TR1, which is 2V
BE
higher than the pin voltage,
generates a current through R1 which is amplified to the
output by transistor TR1. The voltage drop at the external
resistor R
ext
stabilizes voltage V
pin
near ground. The
recommended value for R
ext
is 1 k
.
handbook, full pagewidth
MHB956
R1
6 k
TR1
8 V
VP
Vpin
Vi
Rext
Vref = 2VBE
TR2
TR3
junctions from pin to substrate
clamping pulse
TDA4887PS
ground
Fig.25 Protection circuit at pins CLI and HFB.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TDA4887PS | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:160 MHz bus-controlled monitor video preamplifier |
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