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Integral |
TECHNICAL DATA
IL1815 Adaptive Variable Reluctance Sensor Amplifier
Features
• Adaptive hysteresis
• Single supploperation
• Ground referenced input
• True zero crossing timing reference
• Operates from 2V to 12V supply voltage
• Handles inputs from 100 mV to over
120V with external resistor
• CMOS compatible logic
Applications
• Position sensing with notched wheels
• Zero crossing switch
• Motor speed control
• Tachometer
• Engine testing
IL1815
N SUFFIX
PLASTIC DIP
14
1
14
1
D SUFFIX
PLASTIC SO
ORDERING INFORMATION
IL1815N Plastic DIP
IL1815D SOIC
TA = -55° to 125° C for all packages
General Description
The IL1815 is an adaptive sense amplifier and default gating circuit for motor control
applications. The sense amplifier 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 processed
(delayed) externally and returned to the IL1815. 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 100 mVp-p.
INTEGRAL
1
Connection Diagram
IL1815
Top View
Truth Table
Signal
Input
Pulses
X
Timing Gated Input Select Input Output
L X Pulses
H
Pulses
Pulses
Absolute Maximum Ratings
Supply Voltage 12V
Power Dissipation (Note 1) 1250 mW
Operating Temperature Range -400C to +1250C
Storage Temperature Range -650C to +1500C
Junction Temperature (Note 2) +1250C
Input Current ±30 mA
INTEGRAL
2
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