參數(shù)資料
型號(hào)： MAX9020EKA+T
廠商： Maxim Integrated Products
文件頁(yè)數(shù)： 5/17頁(yè)
文件大小： 0K
描述： IC COMPARATOR DUAL SOT23-8
產(chǎn)品培訓(xùn)模塊： Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
標(biāo)準(zhǔn)包裝： 1
系列： Beyond-the-Rails™
類型： 通用
元件數(shù)： 2
輸出類型： CMOS，開路漏極，滿擺幅
電壓 - 電源，單路/雙路(±)： 1.8 V ~ 5.5 V
電壓 - 輸入偏移（最小值）： 5mV @ 5V
電流 - 輸入偏壓（最小值）： 0.001µA @ 5V
電流 - 輸出（標(biāo)準(zhǔn)）： 50mA
電流 - 靜態(tài)（最大值）： 2µA
CMRR, PSRR（標(biāo)準(zhǔn)）： 80dB PSRR
傳輸延遲（最大）： 31µs
磁滯： 4mV
工作溫度： -40°C ~ 85°C
封裝/外殼： SOT-23-8
安裝類型： 表面貼裝
包裝： 標(biāo)準(zhǔn)包裝
產(chǎn)品目錄頁(yè)面： 1391 (CN2011-ZH PDF)
其它名稱： MAX9020EKA+TDKR
MAX9015–MAX9020
SOT23, Dual, Precision, 1.8V, Nanopower
Comparators With/Without Reference
13
Maxim Integrated
6) Verify the trip voltages and hysteresis as follows:
VIN rising: = 2.992V, which is equivalent to REF
times R1 divided by the parallel combination of R1,
R2:
and R3.
VIN falling: = 2.942V:
Hysteresis = VTHR - VTHF = 50mV.
Additional Hysteresis
(MAX9016/MAX9018/MAX9020)
(Open-Drain Outputs)
The MAX9016/MAX9018/MAX9020 feature a built-in 4mV
hysteresis band. These devices have open-drain outputs
and require an external pullup resistor (Figure 3).
Additional hysteresis can be generated using positive
feedback, but the formulas differ slightly from those of
the MAX9015/MAX9017/MAX9019. Use the following
procedure to calculate 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] - R4. Use the
smaller of the two resulting resistor values. For
example, when using the MAX9018 (VREF = 1.24V)
and VCC = 5V, and if we choose IR3 = 0.2A, and
R4 = 1M
Ω, then the two resistor values are 6.2MΩ
and 18M
Ω. Choose a 6.2MΩ standard value for R3.
2) Choose the hysteresis band required (VHB).
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:
(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 49.9k
Ω standard value.
6) Verify the trip voltages and hysteresis as follows:
Hysteresis = VTHR - VTHF = 50mV.
V
falling V
V
x R
RR
R
RR
xV
V
IN
THF
REF
CC
:
.
=
+
+
+
=
1
2
1
3
1
34
2 993
Vri
g V
V
x R
RR
R
V
IN
THR
REF
sin :
.
=
+
+
=
1
2
1
3
3 043
R
V
Vx
k
M
k
2
1
30
124
72
1
72
1
62
51 1
=
Ω
Ω
Ω
=Ω
.
..
.
R
V
Vx R
R
THR
REF
2
1
3
=
VV
V
THR
REF
HB
CC
>+
1
RM
M
mV
V
k
16 2
1
50
5
72
=Ω +
Ω
=Ω
(.
)
RR
R
V
HB
CC
13
4
=+
()
VV
Rx V
R
THF
THR
CC
=
1
3
VV
x R
RR
R
THR
REF
=
+
+
1
2
1
3
VEE
VCC
OUT
R3
R2
R1
R4
VREF
VIN
VCC
MAX9016
MAX9018
MAX9020
Figure 3. MAX9016/MAX9018/MAX9020 Additional Hysteresis
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MAX9021AUK+T 功能描述:校驗(yàn)器 IC Single uPower 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(bǔ)償電壓（最大值）:6 mV 電源電流（最大值）:1350 nA 響應(yīng)時(shí)間: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SC-70-5 封裝:Reel
MAX9021AUK-T 功能描述:校驗(yàn)器 IC Single uPower 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(bǔ)償電壓（最大值）:6 mV 電源電流（最大值）:1350 nA 響應(yīng)時(shí)間: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SC-70-5 封裝:Reel
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