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UC3704J датащи(PDF) 3 Page - Texas Instruments |
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UC3704J датащи(HTML) 3 Page - Texas Instruments |
3 / 6 page UC3704 ELECTRICAL CHARACTERISTICS: PARAMETER TEST CONDITIONS MIN TYP MAX UNITS Comparator Two (QOUT and QOUT) Threshold Voltage 2.2 3.0 3.8 V Threshold Resistance To Ground 14 20 24 k Ω Input Bias Current VIN (Pin 12) = 5V 1 3 µA Remote Activate Current Pin 14 = 0V 0.2 0.5 mA Reset Current Pin 13 = 0V 0.2 0.5 mA Remote Activate Threshold TA = 25°C 0.8 1.2 V Reset Threshold TA = 25°C 0.8 1.2 V Output Saturation IOUT = 16mA 0.2 0.5 V IOUT = 50mA 0.7 2.0 V Output Leakage VOUT = 40V 0.2 10 µA Output Response Comp. Overdrive = 1V RL = 5k to VIN Turn-on 0.4 µs Turn-off 1.0 µs Buffer Set Voltage (VIN -VS)TJ = 25°C, IS = 100mA 1.9 2.1 2.3 V Drive Current TJ = 25°C, RS = 200 Ω, VD = 0V 90 100 120 mA Note 1: Parameter guaranteed by design, not tested in production. Note 2: Collector output current = VIN − VREF − VBE RE ≈ 1.5 V RE APPLICATIONS INFORMATION Sensor Section The input portion of the UC3704 provides both excitation and sensing for a low-level, variable impedance transducer. This circuitry consists of a pair of highly matched PNP transistors biased for operation as constant current sources followed by a high gain precision compa- rator. The reference voltage at the bases of the PNP transistors has a TC to offset the base-emitter voltage variation of these transistors resulting in a constant voltage across the external emitter resistors and correspondingly con- stant collector currents for balancing, offsetting, or to pro- vide unique temperature characteristic. With the PNP transistor’s optimum current ranging from 10 to 200 µA, and the common-mode input voltage of the comparator usable from ground to (VIN - 3V), a wide range of transducer impedance levels is possible. The sensor comparator has a current source pull-up at the output so that an external capacitor from this point to ground can be used to provide a programmable delay be- fore reaching the second comparator’s threshold. The low-impedance on-state of Comp 1’s output provides quick reset of this capacitor. This programmable delay function is useful for providing transient protection by re- quiring that Comp 1 remain activated for a finite period of time before Comp 2 triggers. Another application is in counting repetitive pulses where a missing pulse will al- low Comp 1’s output to rise to Comp 2’s threshold. This time delay function is: Delay = Comp2 Threshold Delay Current X CD ≈ 175ms ⁄ µF If hysteresis is desired for Comparator 1, it may be ac- commodated by applying positive feedback from the de- lay terminal to the non-inverting input on Pin 7. This will aid in providing oscillation-free transitions for very slowly changing inputs. Unless otherwise stated, these specifications apply for TA = 0°C to +70°C for the UC3704: VIH = 15V, TA =TJ. 3 |
Аналогичный номер детали - UC3704J |
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Аналогичное описание - UC3704J |
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