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參數(shù)資料
| 型號： | MAX9017BEKA+T |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 4/17頁 |
| 文件大?。?/td> | 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： | 帶電壓基準(zhǔn) |
| 元件數(shù)： | 2 |
| 輸出類型： | CMOS，推挽式，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）： | 2.8µA |
| CMRR, PSRR（標(biāo)準(zhǔn)）： | 80dB PSRR |
| 傳輸延遲（最大）： | 28µs |
| 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)品目錄頁面： | 1391 (CN2011-ZH PDF) |
| 其它名稱： | MAX9017BEKA+TDKR |
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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