TI-LM1815.pdf
需积分: 5 13 浏览量
2022-12-06
22:44:18
上传
评论 4
收藏 1.28MB PDF 举报
LM1815
www.ti.com
SNOSBU8F –SEPTEMBER 2000–REVISED MARCH 2013
LM1815 Adaptive Variable Reluctance Sensor Amplifier
Check for Samples: LM1815
1
FEATURES
DESCRIPTION
The LM1815 is an adaptive sense amplifier and
2
• Adaptive Hysteresis
default gating circuit for motor control applications.
• Single Supply Operation
The sense amplifier provides a one-shot pulse output
• Ground Referenced Input
whose leading edge coincides with the negative-
going zero crossing of a ground referenced input
• True Zero Crossing Timing Reference
signal such as from a variable reluctance magnetic
• Operates from 2V to 12V Supply Voltage
pick-up coil.
• Handles Inputs from 100 mV
P-P
to over 120V
P-P
In normal operation, this timing reference signal is
with External Resistor
processed (delayed) externally and returned to the
• CMOS Compatible Logic
LM1815. A Logic input is then able to select either
the timing reference or the processed signal for
APPLICATIONS
transmission to the output driver stage.
• Position Sensing with Notched Wheels
The adaptive sense amplifier operates with a positive-
going threshold which is derived by peak detecting
• Zero Crossing Switch
the incoming signal and dividing this down. Thus the
• Motor Speed Control
input hysteresis varies with input signal amplitude.
• Tachometer
This enables the circuit to sense in situations where
• Engine Testing the high speed noise is greater than the low speed
signal amplitude. Minimum input signal is 150mV
P-P
.
Connection Diagram
Figure 1. Top View
14-Lead SOIC or PDIP
See D or NFF0014A Package
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
2All trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Copyright © 2000–2013, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
剩余16页未读，继续阅读
评论0
最新资源