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參數(shù)資料
| 型號： | LM9011 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | Electronic Ignition Interface |
| 中文描述： | 電子點(diǎn)火接口 |
| 文件頁數(shù)： | 11/16頁 |
| 文件大?。?/td> | 332K |
| 代理商： | LM9011 |
Circuit Description
VR Sensor Interface
The differential inputs, VR_HI and VR_LO are low imped-
ance inputs with a DC voltage bias of one half of Vcc, Both
inputs require equal value series resistance on their respec-
tive pins to convert the VR sensor voltage to a differential in-
put current. The differential input current range is typically
2.5μA peak-to-peak to 2.5mA peak-to-peak. Each input has
active current limiting that will clamp the current at typically
+/-5mA. This is intended for short circuit protection and not
for input signal limiting.
Differential voltages of 500mV peak-to-peak to 500V peak-
to-peak can be processed with the specified 100K
series
resistor on each input. Numerous variables will determine
the output voltage signal from a VR sensor across a fre-
quency range. The input resistors can be scaled from typi-
cally 50K
to 200K
to keep the differential input current
with-in the recommended range for a given VR Sensor out-
put voltage. Bypass capacitors can be added to form a low
pass filter to limit the differential input signal at the higher fre-
quencies.
The VR Sensor interface utilizes a dynamic hysteresis which
will increase the hysteresis level as the input signal from the
VR Sensor increases. The circuit requires two external com-
ponents to fully implement the hysteresis function: a capaci-
tor on VR_FC to filter and store the peak detector signals;
and a 150K
resistor on VR_BIAS to set a reference current
for the hysteresis circuit. The typical value range for the peak
detector storage capacitor is 0.1μF to 0.47μF.
The peak detector has an internal 3K
(typical) current lim-
iting resistor to Vcc for charging the storage capacitor.An ex-
ternal resistor in parallel with the peak detector storage ca-
pacitor is used to set the RC discharge rate of the peak
detector capacitor.
For input levels greater than typically 10μA peak-to-peak the
voltage on the peak detector output pin VR_FC is used to ac-
tively derive the hysteresis level. The active hysteresis will
typically be 30% of the peak input signal. As the input level
falls below typically 10μA peak-to-peak the hysteresis level
will begin to rise as the static hysteresis level takes effect.
The static hysteresis level is set by the current out of the VR-
_BIAS pin and is a constant level of typically 1μA peak with
a VR_BIAS resistor of 150K
. This static hysteresis level
acts as the minimum detect threshold as there will be no out-
put if the input signal is not greater than the static hysteresis
level.
The VR_BIAS resistor can be scaled from typically 50K
to
500K
, but the practical range is typically 75K
to 300K
.
Increasing the resistance (i.e. reducing the current) will lower
the minimum hysteresis level. Conversely, reducing the re-
sistance will raise the minimum hysteresis level. Since the
VR_BIAS current is modified by the same square root circuit
used for the input signal, the relationship between the VR-
_BIAS resistor value and the minimum detect level is not lin-
ear. For VR_BIAS values greater than 500K
, the minimum
detect level is typically determined more by the internal de-
vice offsets, and thermal effects.
Voltage Comparators
The circuit includes four general purpose voltage compara-
tors that use an internal reference voltage to set their voltage
thresholds. Three of the comparators have their non-
inverting inputs tied to the internal reference voltage, and
their inverting-inputs are brought out. The remaining one
comparator has its inverting input tied to the internal voltage
reference, and its non-inverting input is brought out. All four
comparators include hysteresis to improve noise immunity.
The comparator outputs are internally pulled up to V
. Any
un-used comparator should have its input connected to de-
vice ground.
DS101264-21
FIGURE 10. VR Sensor Interface Block Diagram
DS101264-22
FIGURE 11. Voltage Comparator Block Diagram
L
www.national.com
11
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM9011M | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Electronic Ignition Interface |
| LM9011M/NOPB | 功能描述:IC INTERFACE ELECT IGNITN 28SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 電源管理 - 專用 系列:- 應(yīng)用說明:Ultrasound Imaging Systems Application Note 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:37 系列:- 應(yīng)用:醫(yī)療用超聲波成像，聲納 電流 - 電源:- 電源電壓:2.37 V ~ 6 V 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:56-WFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:56-TQFN-EP（8x8） 包裝:管件 |
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