NTE995

Features:

 Ground Referenced Tachometer Input Interfaces Directly with Variable Reluctance Magnetic Pickups
OP Amp/Comparator has Floating Transistor Output
50mA Sink or Source to Operate Relays, Solenoids, Meters, or LEDs
Frequency Doubling for Low Ripple
Tachometer has BuiltIn Hysteresis with Either Differential Input or Ground Referenced Input
BuiltIn Zener Diode
±0.3% Linearity Typical
Ground Referenced Tachometer is Fully Protected from damage Due to Swings Above V_CC and Below GND


Application

 Over/Under Speed Sensing
Frequency to Voltage Conversion (Tachometer)
Speedometers
Breaker Point Dwell Meters
HandHeld Tachometer
Speed Governors
Cruise Control
Automotive Door Lock Control
Clutch Control
Horn Control
Touch or Sound Switches


Pinout




Specifications

Supply Voltage, V_CC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28V
Supply Current (Zener Options)  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25mA
Collector Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . .. . . . . . . . . . . . . . . . 28V
Differential Input Voltage
Tachometer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  28V
OP Amp/Comparator  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . 28V
Input Voltage Range
Tachometer
NTE995M  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . ±28V
NTE955  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.0V to +28V
OP Amp/Comparator  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . 0.0V to +28V
Power Dissipation (Note 1), P_D
NTE995M  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1200mW
NTE995  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1580mW
Operating Temperature Range, T_opr . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  40° to +85°C
Storage Temperature Range, T_stg. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65° to +150°C 
Lead Temperature, _TL
NTE995, NTE995M (During Soldering, 10sec) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +260°C
NTE995M
(Vapor Phase, 60sec) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +215°C
(Infrared, 15sec)  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  . . . . . . . . . . . . . . . . +220°C


Description

The NTE995 (14Lead DIP) and NTE995M (8Lead DIP) are monolithic frequency to voltage con-verters with a high gain OP amp/comparator designed to operate a relay, lamp, or other load when the input frequency reaches or exceeds a selected rate.  The tachometer NTE995 uses a charge pump tech-nique and offers frequency doubling for low ripple, full input protection, and its output swings to GND for a zero frequency input.