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NTE995 & NTE995M Integrated Circuit Frequency-to-Voltage Converter
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. Advantages: D Output Swing to GND for Zero Frequency Input D Easy to Use: VOUT = fIN x VCC 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-In Hysteresis with Either Differential Input or Ground Referenced Input D Built-In Zener Diode D 0.3% Linearity Typical D Ground Referenced Tachometer is Fully Protected from damage Due to Swings Above VCC and Below GND Applications: D Over/Under Speed Sensing D Frequency to Voltage Conversion (Tachometer) D Speedometers D Breaker Point Dwell Meters D Hand-Held Tachometer D Speed Governors
D D D D D
Cruise Control Automotive Door Lock Control Clutch Control Horn Control Touch or Sound Switches
Absolute Maximum Ratings: 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 NTE995M . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28V NTE955 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.0V to +28V OP Amp/Comparator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.0V to +28V Power Dissipation (Note 1), PD NTE995M . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1200mW NTE995 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1580mW Operating Temperature Range, Topr . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -40 to +85C Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -65 to +150C Lead Temperature, TL NTE995, NTE995M (During Soldering, 10sec) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +260C NTE995M (Vapor Phase, 60sec) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +215C (Infrared, 15sec) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +220C Note 1. For operation in ambient temperatures above 25C, the device must be derated based on a +150C maximum junction temperature and a thermal resistance of +101C/W junction to ambient for the NTE995M, and +79C/W junction to ambient for the NTE995. Electrical Characteristics: (VCC = 12V, TA = +25C unless otherwise specified)
Parameter Tachometer Input Thresholds Hysteresis Offset Voltage NTE995 NTE995M Input Bias Current Output Voltage (High Level, Pin2) Output Voltage (Low Level, Pin2) Output Current Leakage Current Gain Constant Linearity VOH VOL I2, I3 I3 K VIN = 50mV VIN = +125mV, Note 3 VIN = -125mV, Note 3 V2 = V3 = 6V, Note 4 I2 = 0, V3 = 0 Note 3 fIN = 1kHz, 5kHz, 10kHz, Note 5 VIN = 250mVP-P @ 1kHz, Note 2 VIN = 250mVP-P @ 1kHz, Note 2 VIN = 250mVP-P @ 1kHz, Note 2 10 - - - - - - 140 - 0.9 -1.0 25 30 3.5 5.0 0.1 8.3 2.3 180 - 1.0 0.3 40 - 10 15 1.0 - - 240 0.1 1.1 +1.0 % mV mV mV mV A V V A A Symbol Test Conditions Min Typ Max Unit
Note 2. Hysteresis is the sum + VTH - (-VTH), offset voltage is their difference. Note 3. VOH is equal to 3/4 x VCC - 1 VBE, VOL is equal to 1/4 x VCC - 1 VBE therefore VOH - VOL = VCC/2. The difference, VOH - VOL, and the mirror gain, I2/I3, are two factors that cause the tachometer gain constant to vary from 1.0. Note 4. Be sure when choosing the time constant R1 x C1 that R1 is such that the maximum anticipated output voltage at Pin3 can be reached with I3 x R1. The maximum value for R1 is limited by the output resistance of Pin3 which is greater than 10M typically. Note 5. Nonlinearity is defined as the deviation of VOUT (@ Pin3) for fIN = 5kHz from a straight line defined by the VOUT @ 1kHz and VOUT @ 10kHz. C1 = 1000pF, R1 = 68k and C2 = 0.22mFd.
Electrical Characteristics (Cont'd): (VCC = 12V, TA = +25C unless otherwise specified)
Parameter OP Amp/Comparator VOS IBIAS Input Common-Mode Voltage Voltage Gain Output Sink Current Output Source Current Saturation Voltage VC = 1.0 VE = VCC - 2.0 ISINK = 5mA ISINK = 20mA ISINK = 50mA Zener Regulator Regulator Voltage Series Resistance Temperature Stability Total Supply Current RDROP = 470 - - - - 7.56 10.5 +1 3.8 - 15.0 - 6.0 V mV/C mA VIN = 6V VIN = 6V - - 0 - 40 - - - - 3 50 - 200 50 10 0.1 - 1.0 10 500 VCC-1.5V - - - 0.5 1.0 1.5 mV nA V V/mV mA mA V V V Symbol Test Conditions Min Typ Max Unit
Pin Connection Diagram
NTE995
NTE995M
+ Comparator 1 Charge Pump Cap 2 Charge Pump Out 3 + Op Amp In 4 Output Emitter 5 N.C. 6 N.C. 7
14 N.C. 13 N.C. 12 GND 11 - Comparator In 10 - Op Amp In 9 Vcc 8 Output Collector + Comparator In 1 Charge Pump Cap 2 Charge Pump 3 Output Emitter Output 4 8 GND/ Frequency Input 7 - Op Amp In 6 Vcc 5 Collector Output
NTE995
14
8
1
7
.785 (19.95) Max .200 (5.08) Max
.300 (7.62)
.100 (2.45) .600 (15.24)
.099 (2.5) Min
NTE995M
8
5
.256 (6.52) Max
1
4
.393 (10.0) Max .150 (3.81)
.300 (7.62)
.100 (2.54) .300 (7.62)
.070 (1.77) Min

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