Product Summary

The LM1815 is an adaptive sense amplifier and default gating circuit for motor control applications. The LM1815 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. Applications of the LM1815 are (1)position sensing with notched wheels; (2)zero crossing switch; (3)motor speed control; (4)tachometer; (5)engine testing.

Parametrics

LM1815 absolute maximum ratings: (1)Storage Temperature Range: -65°Cto a150°C; (2)Junction Temperature: 125°C; (3)Input Current : 30 mA; (4)Lead Temperature (Soldering, 10 sec.): 260°C; (5)Supply Voltage: 12V; (6)Power Dissipation: 1250 mW; (7)Operating Temperature Range: -40°Cto 125°C.

Features

LM1815 features: (1)Adaptive hysteresis; (2)Single supply operation; (3)Ground referenced input; (4)True zero crossing timing reference; (5)Operates from 2V to 12V supply voltage; (6)Handles inputs from 100 mV to over 120V with external resistor; (7)CMOS compatible logic.

Diagrams

LM1815 pin connection

Image Part No Mfg Description Data Sheet Download Pricing
(USD)
Quantity
LM1815
LM1815

Other


Data Sheet

Negotiable 
LM1815M
LM1815M

National Semiconductor (TI)

Special Purpose Amplifiers

Data Sheet

0-275: $1.36
275-550: $1.22
550-1045: $0.97
1045-5005: $0.94
LM1815M/NOPB
LM1815M/NOPB

National Semiconductor (TI)

Special Purpose Amplifiers ADAPTIVE VARIABLE RELUCTANCE SENSR AMP

Data Sheet

0-1: $2.05
1-25: $1.65
25-100: $1.50
100-250: $1.36
LM1815MX
LM1815MX

National Semiconductor (TI)

Special Purpose Amplifiers

Data Sheet

0-2500: $0.97
2500-5000: $0.94
LM1815MX/NOPB
LM1815MX/NOPB

National Semiconductor (TI)

Special Purpose Amplifiers

Data Sheet

0-1890: $0.97
1890-2500: $0.97
2500-5000: $0.94
LM1815N
LM1815N

National Semiconductor (TI)

Special Purpose Amplifiers

Data Sheet

0-250: $1.43
250-500: $1.28
500-1000: $1.03
1000-5000: $0.99
LM1815N/NOPB
LM1815N/NOPB

National Semiconductor (TI)

Special Purpose Amplifiers

Data Sheet

0-1: $2.17
1-25: $1.75
25-100: $1.58
100-250: $1.43