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參數(shù)資料
| 型號： | AD790SQ |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 運(yùn)動控制電子 |
| 英文描述： | Fast, Precision Comparator |
| 中文描述： | COMPARATOR, 1500 uV OFFSET-MAX, 60 ns RESPONSE TIME, CDIP8 |
| 封裝： | HERMETIC SEALED, CERDIP-8 |
| 文件頁數(shù)： | 8/8頁 |
| 文件大小： | 211K |
| 代理商： | AD790SQ |
AD790
REV. B
–8–
C
P
2
3
1
4
6
7
5
8
TTL
LEVEL
OUTPUT
400 *
5V
+
GND
STANDARD
SCHOTTKY
DIODE
1k
A RESISTOR UP TO 10k‰ MAYBE USED TO
REDUCE THE SOURCE AND SINK CURRENT OF
THE DRIVER. HOWEVER, THIS WILL SLIGHTLY
LOWER THE MAXIMUM USABLE CLOCK RATE.
*
BIPOLAR
SIGNAL
INPUT
4.7V
0.3V
5V
–
Figure 19. A Bipolar to CMOS TTL Line Receiver (N, Q
Package Pinout)
Bipolar to CMOS/T T L
It is sometimes desirable to translate a bipolar signal (e.g.,
±
5 V) coming from a communications cable or another section
of the system to CMOS/T T L logic levels; such an application is
referred to as a line receiver. Previously, the interface to the bi-
polar signal required either a dual (
±
) power supply or a refer-
ence voltage level about which the line receiver would switch.
T he AD790 may be used in a simple circuit to provide a unique
capability: the ability to receive a bipolar signal while powered
from a single +5 V supply. Other comparators cannot perform
this task. Figure 19 shows a 1 k
resistor in series with the input
signal which is then clamped by a Schottky diode, holding the
input of the comparator at 0.4 V below ground. Although the
comparator is specified for a common mode range down to –V
S
,
(in this case ground) it is permissible to bring one of the inputs
a few hundred mV below ground. T he comparator switches
around this level and produces a CMOS/T T L compatible
swing. T he circuit will operate to switching frequencies of
20 MHz.
OUT LINE DIME NSIONS
Dimensions shown in inches and (mm).
8-Pin Plastic Mini-DIP (N-8) Package
8-Pin Cerdip (Q-8) Package
SOIC (SO-8) Package
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相關(guān)代理商/技術(shù)參數(shù) |
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| AD790SQ/883B | 制造商:AD 制造商全稱:Analog Devices 功能描述:Fast, Precision Comparator |
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