參數(shù)資料
型號(hào)： MAX919ESA+T
廠商： Maxim Integrated Products
文件頁(yè)數(shù)： 3/15頁(yè)
文件大?。?/td> 0K
描述： IC COMPARATOR BTR 8-SOIC
其它有關(guān)文件： Automotive Product Guide
產(chǎn)品培訓(xùn)模塊： Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
標(biāo)準(zhǔn)包裝： 2,500
系列： Beyond-the-Rails™
類型： 通用
元件數(shù)： 1
輸出類型： CMOS，推挽式，滿擺幅，TTL
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）： 1.2µA
CMRR, PSRR（標(biāo)準(zhǔn)）： 66.02dB CMRR，80dB PSRR
傳輸延遲（最大）： 940µs
磁滯： 4mV
工作溫度： -40°C ~ 85°C
封裝/外殼： 8-SOIC（0.154"，3.90mm 寬）
安裝類型： 表面貼裝
包裝： 帶卷 (TR)
MAX917–MAX920
SOT23, 1.8V, Nanopower, Beyond-the-Rails
Comparators With/Without Reference
______________________________________________________________________________________
11
THRESHOLDS
OUT
IN+
IN-
VHB
HYSTERESIS
BAND
VTHF
VTHR
Figure 2. Threshold Hysteresis Band
VCC
MAX917
MAX919
OUT
R3
R1
R2
VREF
VEE
VIN
VCC
Figure 3. MAX917/MAX919 Additional Hysteresis
Additional Hysteresis (MAX917/MAX919)
The MAX917/MAX919 have a 4mV internal hysteresis
band (VHB). Additional hysteresis can be generated
with three resistors using positive feedback (Figure 3).
Unfortunately, this method also slows hysteresis re-
sponse time. Use the following procedure to calculate
resistor values.
1) Select R3. Leakage current at IN is under 2nA, so
the current through R3 should be at least 0.2A to
minimize errors caused by leakage current. The cur-
rent through R3 at the trip point is (VREF - VOUT)/R3.
Considering the two possible output states in solving
for R3 yields two formulas: R3 = VREF/IR3 or R3 =
(VCC - VREF)/IR3. Use the smaller of the two resulting
resistor values. For example, when using the
MAX917 (VREF = 1.245V) and VCC = 5V, and if we
choose IR3 = 1A, then the two resistor values are
1.2M
Ω and 3.8MΩ. Choose a 1.2MΩ standard value
for R3.
2) Choose the hysteresis band required (VHB). For this
example, choose 50mV.
3) Calculate R1 according to the following equation:
R1 = R3 (VHB / VCC)
For this example, insert the values
R1 = 1.2M
Ω (50mV/5V) = 12kΩ
4) Choose the trip point for VIN rising (VTHR) such that
VTHR > VREF (R1 + R3)/R3 (VTHF is the trip point for
VIN falling). 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:
R2 = 1/[VTHR/(VREF R1) - (1 / R1) - (1 / R3)]
R2 = 1/[3.0V/(1.2V 12k
Ω) - (1 / 12kΩ) -
(1/1.2M
Ω)] = 8.05kΩ
For this example, choose an 8.2k
Ω standard value.
6) Verify the trip voltages and hysteresis as follows:
VIN rising: VTHR = VREF R1 [(1 / R1) + (1 / R2)
+ (1 / R3)]
VIN falling: VTHF = VTHR - (R1 VCC / R3)
Hysteresis = VTHR - VTHF
Additional Hysteresis (MAX918/MAX920)
The MAX918/MAX920 have a 4mV internal hysteresis
band. They have open-drain outputs and require an
external pullup resistor (Figure 4). Additional hysteresis
can be generated using positive feedback, but the for-
mulas differ slightly from those of the MAX917/
MAX919. Use the following procedure to calculate
resistor values.
1) Select R3 according to the formulas R3 = VREF / 1A
or R3 = (VCC - VREF)/1A - R4. Use the smaller of
the two resulting resistor values.
2) Choose the hysteresis band required (VHB).
3) Calculate R1 according to the following equation:
R1 = (R3 + R4) (VHB/VCC)
4) Choose the trip point for VIN rising (VTHR) (VTHF is
the trip point for VIN falling). This is the threshold
voltage at which the comparator switches its output
from low to high as VIN rises above the trip point.
5) Calculate R2 as follows:
R2
1/ V
/ V
R1
1
R1
1
R3
THR
REF
=
()
相關(guān)PDF資料
PDF描述
VI-J71-MY-F4 CONVERTER MOD DC/DC 12V 50W
MAX9109ESA+T IC COMPAR LP SNGL 8-SOIC
VI-J71-MY-F3 CONVERTER MOD DC/DC 12V 50W
VI-J71-MY-F2 CONVERTER MOD DC/DC 12V 50W
MAX9024AUD+T IC COMPARATOR QUAD 14-TSSOP
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX919EUK 制造商:Maxim Integrated Products 功能描述:5 PINS SOT PKG BULK - Cut Tape Product
MAX919EUK/V+T 功能描述:校驗(yàn)器 IC 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(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
MAX919EUK+ 制造商:Maxim Integrated Products 功能描述:COMPARATOR SGL R-R O/P 5.5V 5PIN SOT-23 - Rail/Tube
MAX919EUK+T 功能描述:校驗(yàn)器 IC 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(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
MAX919EUK-T 功能描述:校驗(yàn)器 IC 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(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
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*