NTE995 & NTE995M
Integrated Circuit
Frequency鈥搕o鈥揤oltage Converter
Description:
The NTE995 (14鈥揕ead DIP) and NTE995M (8鈥揕ead 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 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.
Advantages:
D
Output Swing to GND for Zero Frequency Input
D
Easy to Use: V
OUT
= f
IN
x V
CC
x R1 x C1
D
Only One RC Network Provides Frequency Doubling
D
Zener Regulator On Chip Allows Accurate and Stable Frequency to Voltage or Current Conversion
Features:
D
Ground Referenced Tachometer Input Interfaces Directly with Variable Reluctance Magnetic
Pickups
D
OP Amp/Comparator has Floating Transistor Output
D
50mA Sink or Source to Operate Relays, Solenoids, Meters, or LEDs
D
Frequency Doubling for Low Ripple
D
Tachometer has Built鈥揑n Hysteresis with Either Differential Input or Ground Referenced Input
D
Built鈥揑n Zener Diode
D
鹵0.3%
Linearity Typical
D
Ground Referenced Tachometer is Fully Protected from damage Due to Swings Above V
CC
and Below GND
Applications:
D
Over/Under Speed Sensing
D
Frequency to Voltage Conversion (Tachometer)
D
Speedometers
D
Breaker Point Dwell Meters
D
Hand鈥揌eld Tachometer
D
Speed Governors
D
D
D
D
D
Cruise Control
Automotive Door Lock Control
Clutch Control
Horn Control
Touch or Sound Switches
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