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参数资料
| 型号： | MAX9017AEKA/V+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 4/17页 |
| 文件大小： | 0K |
| 描述： | IC COMPARATOR 1.8V NANO SOT23-8 |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 类型： | 带电压基准 |
| 元件数： | 2 |
| 输出类型： | 推挽式 |
| 电压 - 电源，单路/双路(±)： | 1.8 V ~ 5.5 V |
| 电流 - 静态（最大值）： | 2.8µA |
| 磁滞： | 4mV |
| 封装/外壳： | SOT-23-8 |
| 安装类型： | 表面贴装 |
| 包装： | 带卷 (TR) |
MAX9015–MAX9020
SOT23, Dual, Precision, 1.8V, Nanopower
Comparators With/Without Reference
12
Maxim Integrated
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 (VTHR) and one for the
falling input voltage (VTHF) (Figure 1). The difference
between the trip points is the hysteresis (VHB). 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 (VHB). 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
0.2A to minimize errors caused by input bias cur-
rent. The current through R3 at the trip point is
(VREF - VOUT)/R3. Considering the two possible out-
put states in solving for R3 yields two formulas: R3
= VREF/IR3 or R3 = (VCC - VREF)/IR3. Use the small-
er of the two resulting resistor values. For example,
when using the MAX9017 (VREF = 1.24V) and VCC
= 5V, and if we choose IR3 = 0.2A, then the two
resistor values are 6.2M
Ω and 19MΩ. Choose a
6.2M
Ω standard value for R3.
2) Choose the hysteresis band required (VHB). 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 VIN rising (VTHR) such that:
where VTHR is the trip point for VIN rising. This is the
threshold voltage at which the comparator switches
its output from low to high as VIN rises above the
trip point. For this example, choose 3V.
5) Calculate R2 as follows:
For this example, choose a 44.2k
Ω standard value.
R
VX
k
M
k
V
2
1
124
62
1
62
1
62
43 99
30
=
Ω
Ω
Ω
=Ω
(.
)
.
R
V
X RRR
THR
REF
2
1
3
=
VV
V
THR
REF
HB
CC
>+
1
RM
mV
V
k
16 2
50
5
12
=Ω
=Ω
.
RR
V
HB
CC
13
=
THRESHOLDS
OUT
IN+
IN-
VHB
HYSTERESIS
BAND
VTHF
VTHR
Figure 1. Threshold Hysteresis Band
VCC
MAX9015
MAX9017
MAX9019
OUT
R3
R1
R2
VREF
VEE
VIN
VCC
Figure 2. MAX9015/MAX9017/MAX9019 Additional Hysteresis
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX9017B | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:SOT23, Dual, Precision, 1.8V, Nanopower Comparators With/Without Reference |
| MAX9017BEKA | 制造商:Maxim Integrated Products 功能描述:SOT23, DUAL, PRECISION, 1.8V, NANOPOWER COMPA - Rail/Tube |
| MAX9017BEKA+ | 制造商:Maxim Integrated Products 功能描述:COMPARATOR DUAL R-R O/P 5.5V 8PIN SOT-23 - Rail/Tube |
| MAX9017BEKA+T | 功能描述:校验器 IC Dual Precision 1.8V nPower Comparator RoHS:否 制造商:STMicroelectronics 产品: 比较器类型: 通道数量: 输出类型:Push-Pull 电源电压-最大:5.5 V 电源电压-最小:1.1 V 补偿电压（最大值）:6 mV 电源电流（最大值）:1350 nA 响应时间: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SC-70-5 封装:Reel |
| MAX9017BEKA-T | 功能描述:校验器 IC Dual Precision 1.8V nPower Comparator RoHS:否 制造商:STMicroelectronics 产品: 比较器类型: 通道数量: 输出类型:Push-Pull 电源电压-最大:5.5 V 电源电压-最小:1.1 V 补偿电压（最大值）:6 mV 电源电流（最大值）:1350 nA 响应时间: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SC-70-5 封装:Reel |
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