Description:

The NTE995 (14–Lead DIP) and NTE995M (8–Lead DIP) are monolithic frequency to voltage converters 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 uses a charge pump technique and offers frequency doubling for low ripple, full input protection, and its output swings to GND for a zero frequency input.

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 Built–In Hysteresis with Either Differential Input or Ground Referenced Input

● Built–In Zener Diode

● ±0.3 Linearity Typical

● Ground Referenced Tachometer is Fully Protected from damage Due to Swings Above VCC and Below GND

Advantages:

● Output Swing to GND for Zero Frequency Input

● Easy to Use: VOUT = fIN x VCC x R1 x C1

● Only One RC Network Provides Frequency Doubling

● Zener Regulator On Chip Allows Accurate and Stable Frequency to Voltage or Current Conversion

Applications:

● Over/Under Speed Sensing

● Frequency to Voltage Conversion (Tachometer)

● Speedometers

● Breaker Point Dwell Meters

● Hand–Held Tachometer

● Speed Governors

● Cruise Control

● Automotive Door Lock Control

● Clutch Control

● Horn Control

● Touch or Sound Switches