- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄383535 > MAX9018 (Maxim Integrated Products, Inc.) SOT23. Dual. Precision. 1.8V. Nanopower Comparators With/Without Reference PDF資料下載
參數(shù)資料
| 型號： | MAX9018 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | SOT23. Dual. Precision. 1.8V. Nanopower Comparators With/Without Reference |
| 中文描述： | SOT23封裝、雙路、高精度、1.8V、納安級功耗比較器，帶或不帶基準 |
| 文件頁數(shù)： | 12/16頁 |
| 文件大?。?/td> | 446K |
| 代理商： | MAX9018 |
M
Internal Hysteresis
Many comparators oscillate in the linear region of oper-
ation because of noise or undesired parasitic feed-
back. Oscillations can occur when the voltage on one
input is equal or very close to the voltage on the other
input. The MAX9015
–
MAX9020 have internal 4mV hys-
teresis to counter parasitic effects and noise.
The hysteresis in a comparator creates two trip points:
one for the rising input voltage (V
THR
) and one for the
falling input voltage (V
THF
) (Figure 1). The difference
between the trip points is the hysteresis (V
HB
). When
the comparator
’
s input voltages are equal, the hystere-
sis effectively causes one comparator input to move
quickly past the other, thus taking the input out of the
region where oscillation occurs. Figure 1 illustrates the
case in which the comparator
’
s inverting input has a
fixed voltage applied, and the noninverting input is var-
ied. If the inputs were reversed, the figure would be the
same, except with an inverted output.
Additional Hysteresis
(MAX9015/MAX9017/MAX9019)
(Push-Pull Outputs)
The MAX9015/MAX9017/MAX9019 feature a built-in
4mV hysteresis band (V
HB
). Additional hysteresis can
be generated with three resistors using positive feed-
back (Figure 2). Use the following procedure to calcu-
late resistor values:
1) Select R3. Input bias current at IN_+ is less than
2nA, so the current through R3 should be at least
0.2μA to minimize errors caused by input bias cur-
rent. The current through R3 at the trip point is
(V
REF
- V
OUT
)/R3. Considering the two possible out-
put states in solving for R3 yields two formulas: R3
= V
REF
/IR3 or R3 = (V
CC
- V
REF
)/I
R3
. Use the small-
er of the two resulting resistor values. For example,
when using the MAX9017 (V
REF
= 1.24V) and V
CC
= 5V, and if we choose I
R3
= 0.2μA, then the two
resistor values are 6.2M
and 19M
. Choose a
6.2M
standard value for R3.
2) Choose the hysteresis band required (V
HB
). For this
example, choose 50mV.
3) Calculate R1 according to the following equation:
For this example, insert the values:
4) Choose the trip point for V
IN
rising (V
THR
) such that:
where V
THR
is the trip point for V
IN
rising. This is the
threshold voltage at which the comparator switches
its output from low to high as V
IN
rises above the
trip point. For this example, choose 3V.
5) Calculate R2 as follows:
1
=
For this example, choose a 44.2k
standard value.
R
V X
k
k
M
k
V
2
1
1 24
( .
62
1
62
1
6 2
.
43 99
.
3 0
.
=
=
)
R
V
V
X R
R
R
THR
REF
2
1
1
1
1
3
V
V
V
V
THR
REF
HB
CC
>
+
1
R
M
mV
V
5
k
1
6.
50
12
=
=
R
R
V
V
HB
CC
1
3
=
SOT23, Dual, Precision, 1.8V, Nanopower
Comparators With/Without Reference
12
______________________________________________________________________________________
THRESHOLDS
OUT
IN+
IN-
V
HB
HYSTERESIS
BAND
V
THF
V
THR
Figure 1. Threshold Hysteresis Band
V
CC
MAX9015
MAX9017
MAX9019
OUT
R3
R1
R2
V
REF
V
EE
V
IN
V
CC
Figure 2. MAX9015/MAX9017/MAX9019 Additional Hysteresis
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX9019 | SOT23. Dual. Precision. 1.8V. Nanopower Comparators With/Without Reference |
| MAX9020 | SOT23. Dual. Precision. 1.8V. Nanopower Comparators With/Without Reference |
| MAX9019EKA | SOT23, Dual, Precision, 1.8V, Nanopower Comparators With/Without Reference |
| MAX9015A | SOT23, Dual, Precision, 1.8V, Nanopower Comparators With/Without Reference |
| MAX9015AEKA-T | SOT23, Dual, Precision, 1.8V, Nanopower Comparators With/Without Reference |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX9018A | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:SOT23, Dual, Precision, 1.8V, Nanopower Comparators With/Without Reference |
| MAX9018AAAKA+T | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX9018AEKA | 制造商:Maxim Integrated Products 功能描述:SOT23 DUAL PRECISION 1.8V NANOPOWER COMPARATORS WITH/WITHOUT - Bulk |
| MAX9018AEKA+ | 制造商:Maxim Integrated Products 功能描述:COMPARATOR 2 R-R O/P 5.5V 8PIN SOT-23 - Rail/Tube |
| MAX9018AEKA+T | 功能描述:校驗器 IC Dual Precision 1.8V nPower Comparator RoHS:否 制造商:STMicroelectronics 產(chǎn)品: 比較器類型: 通道數(shù)量: 輸出類型:Push-Pull 電源電壓-最大:5.5 V 電源電壓-最小:1.1 V 補償電壓（最大值）:6 mV 電源電流（最大值）:1350 nA 響應時間: 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:SC-70-5 封裝:Reel |
發(fā)布緊急采購，3分鐘左右您將得到回復。