LM1815M/NOPB National Semiconductor, LM1815M/NOPB Datasheet - Page 2
![IC ADAPTIVE SENSE AMP 14SOIC](/photos/5/65/56572/pkg_m14a_sml.jpg)
LM1815M/NOPB
Manufacturer Part Number
LM1815M/NOPB
Description
IC ADAPTIVE SENSE AMP 14SOIC
Manufacturer
National Semiconductor
Type
Sensor Interfacer
Specifications of LM1815M/NOPB
Package / Case
14-SOIC (3.9mm Width), 14-SOL
Mounting Type
Surface Mount
Current - Supply
6mA
Output Type
Logic
Input Type
Logic
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Interface
-
Other names
*LM1815M::*LM1815M/NOPB::LM1815M
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
LM1815M/NOPB
Manufacturer:
SONY
Quantity:
1 140
© 2005 National Semiconductor Corporation
LM1815
Adaptive Variable Reluctance Sensor Amplifier
General Description
The LM1815 is an adaptive sense amplifier and default
gating circuit for motor control applications. The sense am-
plifier 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 pro-
cessed (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
varies 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
150mV
Connection Diagram
P-P
.
See NS Package Number M14A or N14A
DS007893
Order Number LM1815M or LM1815N
Top View
Features
n Adaptive hysteresis
n Single supply operation
n Ground referenced input
n True zero crossing timing reference
n Operates from 2V to 12V supply voltage
n Handles inputs from 100 mV
n CMOS compatible logic
Applications
n Position sensing with notched wheels
n Zero crossing switch
n Motor speed control
n Tachometer
n Engine testing
external resistor
00789301
P-P
to over 120V
www.national.com
March 2005
P-P
with