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| NTE890 Integrated Circuit Voltage to Frequency Converter Description: The NTE890 is an integrated circuit in an 8-Lead DIP type package and provides a simple method of A/D conversion. It has all the inherent advantages of the voltage-to-frequency conversion technique. The output is a series of constant duration pulses. The frequency of the pulses is proportional to the applied input voltage. This converter is designed for use in a wide range of data conversion and remote sensing applications. Absolute Maximum Ratings: (TA = +25C unless otherwise specified) Supply Voltage, V+ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8V to 22V Output Sink Current, ISINK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20mA Power Dissipation, PD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 500mW Input Voltage, Vi . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.2V to V+(V) Operating Temperature Range, Topr . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -20 to +75C Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -40 to +125C Electrical Characteristics: (V+ = +15V, TA = +25C unless otherwise specified) Parameter Supply Current Test Conditions 8V < V+ < 15V 15V < V+ < 22V Conversion Accuracy Scale Factor Drift with Temperature Drift with V+ Input Comparator Offset Voltage Offset Current Input Bias Current Common Mode Range One-Shot Threshold Voltage Input Bias Current Reset VSAT Note 1 Pin5 Pin5 Pin5, I = 2.2mA VIN = 10V, RS = 14k VIN = 10V VIN = 1V, 8V < V+ < 18V Min 2.0 2.0 0.9 - - - - - Typ 3.5 4.5 1.0 100 0.2 5 50 -100 Max 6.0 7.5 1.1 - 1.0 10 100 -300 - 0.70 -500 0.50 Unit mA mA kHz/V ppM/C %/V mV nA nA V x V+ nA V 0 to V+ -3 0 to V+ -2 0.63 - - 0.66 -100 0.15 Note 1 Input Common Mode Range includes GND. Electrical Characteristics (Cont'd): (V+ = +15V, TA = +25C unless otherwise specified) Parameter Current Source Output Current Change with Voltage Off Leakage Reference Voltage Logic Output VSAT VSAT Off Leakage Test Conditions RS = 14k, Pin1, V+ = 0V Pin1, V+ = 0V to 10V Pin1, V+ = 0V Pin2 Pin3, I = 3mA Pin3, I = 2mA Min - - - 1.70 - - - Typ 138.7 1.0 1 1.90 0.15 0.10 0.1 Max - 2.5 50 2.08 0.50 0.30 1.0 Unit A A nA V V V A Note 2. The voltage applied to comparator input Pin6 and Pin7 should not be allowed to go below GND by more than 300mV. Note 3. Pin3 and Pin5 are open-collector outputs. Shorts between these pins and V+ can cause overheating and eventual destruction. Note 4. Reference voltage terminal Pin2 is connected to the emitter of an NPN transistor and is held at approximately 1.9V. This terminal should be protected from accidental shorts to GND or supply voltages. Permanent damage may occur if current in Pin2 exceeds 5mA. Note 5. Avoid stray coupling between Pin5 and Pin7 which could cause false triggering. If false triggering is experienced with the precision mode circuits, bypass Pin6 to GND with at least 0.01F. This is necessary for operation above 10kHz. Pin Connection Diagram Current Source 1 Scale Factor 2 Logic Output 3 GND 4 8 VCC 7 Input Voltage 6 Threshold 5 One-Shot R, C 8 5 .260 (6.6) 1 4 .390 (9.9) Max .155 (3.93) .300 (7.62) .100 (2.54) .145 (3.68) .300 (7.62) |
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