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| 型號(hào)： | ADCMP343ARJ |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 運(yùn)動(dòng)控制電子 |
| 英文描述： | Dual Comparators with 400mV Reference and programmable Hysteresis |
| 中文描述： | DUAL COMPARATOR, 1800 ns RESPONSE TIME, PDSO8 |
| 封裝： | MO-178BA, SOT-23, 8 PIN |
| 文件頁(yè)數(shù)： | 11/13頁(yè) |
| 文件大?。?/td> | 139K |
| 代理商： | ADCMP343ARJ |
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Preliminary Technical Data
ADCMP341/ADCMP343
APPLICATIONS INFORMATION
The ADCMP341/3 is a dual low power comparators with a built
in 400mV reference that operates from 1.7V to 5.5V. The
comparators are approx 0.8% accurate with fully programmable
accurate hysteresis implementing a new technique of a three
resistor string on the input. The outputs are open drain capable
of sinking up to 40mA.
Rev. PrD | Page 11 of 13
COMPARATORS AND INTERNAL REFERENCE
Each of the comparators has one input available externally, the
other comparator inputs are connected internally to the 400mV
reference. The ADCMP341 has two noninverting comparators
and the ADCMP343 has two inverting comparators.
There are two input pins available to each comparator.
However, these two input pins(INx_U, INx_U) connect to the
same input leg of the comparator via a muxing system. This is
to provide fully programmable rising and falling trip points.
The output of the said comparator determines which pin is
connected to the input of the same comparator. Taking Figure
30. as an example, when OUTA is high INA_U is connected to
the comparator input. When the input voltage drops and passes
below the 400mV reference the output goes low. This in turn
disconnects INA_U from the comparator and connects INA_L.
This leg of the string will be at a lower voltage and thus
instantaneously the effect of hysteresis is applied. Therefore,
using a resistor string on the input as shown in Figure 30., the
voltages for the rising and falling trip points can be
programmed by selecting the appropriate resistors in the string.
PROGRAMMING HYSTERESIS
The resistor values can be calculated as follows. The total
resistance of the string is first determined based on the power
budget available. Using the maximum voltage expected on the
pin and the maximum acceptable current available to flow
through the string
1
, the total resistance of the string is
calculated as follows:
MAX
INMAX
I
TOT
V
R
=
1
Assuming the leakage current into the comparator to be negligible
Now calculate the three resistor values as follows:
FALLING
V
FALLING
V
(
TOT
R
R
)
1
×
=
RISING
TOT
V
R
R
4
×
3
=
;
3
1
2
R
R
R
R
TOT
=
;
Where:
R
1
, R
2
and R
3
are the three resistors as shown in Figure 30.
R
TOT
is the sum of R
1
, R
2
and R
3
.
V
FALLING
is the desired falling trip voltage and lower of the two.
V
RISING
is the desired rising trip voltage and higher of the two.
V
HYST
is therefore = V
RISING
-V
FALLING
V
CC
OUTA
400mV
M
VINA
INA_U
INA_L
ADCMP341
R1
R2
R3
Figure 30.
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| ADCMP343YRJZ-REEL7 | 制造商:Analog Devices 功能描述:IC GEN PUR COMP DUAL 8S SOT-23-8 |
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