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參數(shù)資料
| 型號： | EL2252CN |
| 廠商： | INTERSIL CORP |
| 元件分類： | 比較器 |
| 英文描述： | TRANS ARRAY NPN/NPN SMINI-5 |
| 中文描述： | DUAL COMPARATOR, 13000 uV OFFSET-MAX, PDIP14 |
| 封裝： | PLASTIC, DIP-14 |
| 文件頁數(shù)： | 2/12頁 |
| 文件大?。?/td> | 300K |
| 代理商： | EL2252CN |
EL2252C
Dual 50 MHz ComparatorPin Receiver
Applications Information
Contd
One of the few ways in which oscillations can be
induced is by connecting a high-Q reactive source
impedance to the EL2252 inputs Such sources
are long wires and unterminated coaxial lines
The source impedance should be de-Q’ed One
method is to connect a series resistor to the
EL2252 input of around 100
X value More resist-
ance will calm the system more effectively but at
the expense of comparator response time Anoth-
er method is to install a ‘‘snubber’’ network from
comparator input to ground A snubber is a resis-
tor in series with a small capacitor around 100
X
and 33 pF Each physical and electrical environ-
ment will require different treatments although
many need none
The major use of the HYS pin is to suppress
noise superimposed on the input signal
By
shorting the HYS pin to V
b a g30 mV hystere-
sis is placed around the VOS of the comparator
input Leaving the pin open or more appropri-
ately grounding the HYS pin removes all hyster-
esis
Connecting a resistor between HYS and
V
b
allows an adjustment of the peak-to-peak
hysteresis level Unfortunately an external resis-
tor cannot track the internal devices properly so
temperature and unit-to-unit variations of hys-
teresis are increased The relationship between
the resistor and resulting hysteresis level is not
linear
but a 15k resistor will approximately
halve the nominal value
The time delay of the EL2252 will increase by
about 07 ns when using full hysteresis
The EL2252 is specifically designed to be tolerent
of large inputs It will exhibit very much in-
creased delay times for input overdrives below
100 mV If very small overdrives must be sensed
the EL2018 or EL2019 comparators would be
good choices although they lose accuracies with
signal input Slew Rates above 400 V
ms The
EL2252 keeps its timing accuracy with input
Slew Rates between 100 V
ms and 4000 V msof
input Slew Rate
The output stage drives tens of pF load capaci-
tances without increased overshoot but propaga-
tion delay increases about 1 ns per 10 pF The
output circuit is not a traditional TTL stage and
using an external pullup resistor will not change
the VOH In general setting the output swing to
TTL (by grounding the TTL pin) will optimize
overall propagation delay and gswing symme-
try
10
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相關代理商/技術參數(shù) |
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|---|---|
| EL2252D | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog Comparator |
| EL2252J | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog Comparator |
| EL2252J/883B | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog Comparator |
| EL2256 | 制造商:Rittal 功能描述:ENCLOSURE COMBINATION 6U 制造商:Rittal 功能描述:ENCLOSURE, COMBINATION, 6U |
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