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參數資料
| 型號： | LM1815M |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 模擬信號調理 |
| 英文描述： | Adaptive Variable Reluctance Sensor Amplifier |
| 中文描述： | SPECIALTY ANALOG CIRCUIT, PDSO14 |
| 封裝： | SOIC-14 |
| 文件頁數： | 1/6頁 |
| 文件大小： | 133K |
| 代理商： | LM1815M |
TL/H/7893
L
February 1995
LM1815 Adaptive Variable Reluctance Sensor Amplifier
General Description
The LM1815 is an adaptive sense amplifier and default gat-
ing circuit for motor control applications. The sense amplifi-
er provides a one-shot pulse output whose leading edge
coincides with the negative-going zero crossing of a ground
referenced input signal such as from a variable reluctance
magnetic pick-up coil.
In normal operation, this timing reference signal is process-
ed (delayed) externally and returned to the LM1815. A logic
input is then able to select either the timing reference or the
processed signal for transmission to the output driver stage.
The adaptive sense amplifier operates with a positive-going
threshold which is derived by peak detecting the incoming
signal and dividing this down. Thus the input hysteresis var-
ies with input signal amplitude. This enables the circuit to
sense in situations where the high speed noise is greater
than the low speed signal amplitude. Minimum input signal
is 100 mVp-p.
Features
Y
Adaptive hysteresis
Y
Single supply operation
Y
Ground referenced input
Y
True zero crossing timing reference
Y
Operates from 2V to 12V supply voltage
Y
Handles inputs from 100 mV to over 120V with external
resistor
Y
CMOS compatible logic
Applications
Y
Position sensing with notched wheels
Y
Zero crossing switch
Y
Motor speed control
Y
Tachometer
Y
Engine testing
Connection Diagram
TL/H/7893–1
Top View
Order Number LM1815M or LM1815N
See NS Package Number M14A or N14A
Truth Table
Signal
Input
Input
Select
Timing
Input
Gated
Output
Pulses
L
X
Pulses
X
H
Pulses
Pulses
C
1995 National Semiconductor Corporation
RRD-B30M115/Printed in U. S. A.
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相關代理商/技術參數 |
參數描述 |
|---|---|
| LM1815M/NOPB | 功能描述:特殊用途放大器 ADAPTIVE VARIABLE RELUCTANCE SENSR AMP RoHS:否 制造商:Texas Instruments 通道數量:Single 共模抑制比（最小值）: 輸入補償電壓: 工作電源電壓:3 V to 5.5 V 電源電流:5 mA 最大功率耗散: 最大工作溫度:+ 70 C 最小工作溫度:- 40 C 安裝風格:SMD/SMT 封裝 / 箱體:QFN-20 封裝:Reel |
| LM1815M/NOPB | 制造商:Texas Instruments 功能描述:Operational Amplifier (Op-Amp) IC |
| LM1815MX | 功能描述:特殊用途放大器 RoHS:否 制造商:Texas Instruments 通道數量:Single 共模抑制比（最小值）: 輸入補償電壓: 工作電源電壓:3 V to 5.5 V 電源電流:5 mA 最大功率耗散: 最大工作溫度:+ 70 C 最小工作溫度:- 40 C 安裝風格:SMD/SMT 封裝 / 箱體:QFN-20 封裝:Reel |
| LM1815MX/NOPB | 功能描述:特殊用途放大器 RoHS:否 制造商:Texas Instruments 通道數量:Single 共模抑制比（最小值）: 輸入補償電壓: 工作電源電壓:3 V to 5.5 V 電源電流:5 mA 最大功率耗散: 最大工作溫度:+ 70 C 最小工作溫度:- 40 C 安裝風格:SMD/SMT 封裝 / 箱體:QFN-20 封裝:Reel |
| LM1815MXEP | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Enhanced Plastic Adaptive Variable Reluctance Sensor Amplifier |
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