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The NTE995M (8--lead DIP) is a monolithic frequency to voltage converter 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.
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
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
&plusnm;0.3% linearity typical
Ground referenced tachometer is fully protected from damage due to swings above VCC and below GND
Supply voltage, VCC: 28V
Supply current (zener options): 25mA
Collector voltage: 28V
Differential input voltage tachometer: 28V
OP amp/comparator: 28V
Input voltage range tachometer: &plusnm;28V
OP amp/comparator: 0.0V to +28V
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1. For operation in ambient temperatures above 25°C, the device must be derated based on a +150°C maximum junction temperature and a thermal resistance of +101°C/W junction to ambient for the NTE995M, and +79°C/W junction to ambient for the NTE995.