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LM1042 データシート(PDF) 4 Page - National Semiconductor (TI) |
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LM1042 データシート(HTML) 4 Page - National Semiconductor (TI) |
4 / 8 page Typical Performance Characteristics Supply Voltage Supply Current vs Supply Voltage Regulated Voltage vs Supply Voltage Probe Reference V vs Pin 7 Voltage Output Voltage vs Pin 14 Voltage Output Voltage vs TLH8709 – 3 Pin Function Description Pin 1 Input amplifier for thermo-resistive probe with 5 nA maximum leakage Clamped to ground at the start of a probe 1 measurement Pin 2 Device ground 0V Pin 3 This pin is connected to the emitter of an external PNP transistor to supply a 200 mA constant current to the thermo-resistive probe An internal reference maintains this pin at VSUPPLY b 2V Pin 4 Base connection for the external PNP transistor Pin 5 This pin is connected to the thermo-resistive probe for short and open circuit probe detection Pin 6 Supply pin a 75V to a18V protected against a 50V transients Pin 7 High Impedance input for second linear voltage probe with an input range from 1V to 5V The gain may be set externally using pin 10 Pin 8 Probe select and control input If this pin is taken to a logic low level probe 1 is selected and the timing cycle is initiated The selection logic is subsequently latched low until the end of the measurement If kept at a low level one shot or repeating probe 1 mea- surements will be made depending upon pin 9 condi- tions A high input level selects probe 2 except dur- ing a probe 1 measurement period Pin 9 The repeat oscillator timing capacitor is connected from this pin to ground A 2 mA current charges up the capacitor towards 43V when the probe 1 mea- surement cycle is restarted If this pin is grounded the repeat oscillator is disabled and only one probe 1 measurement will be made when pin 8 goes low Pin 10 A resistor may be connected to ground to vary the gain of the probe 2 input amplifier Nominal gain when open circuit is 12 and when shorted to ground 34 DC conditions may be adjusted by means of a resistor divider network to VREG and ground Pin 11 Regulated voltage output Requires to be connected to pin 15 to complete the supply regulator control loop Pin 12 The capacitor connected from this pin to ground sets the timing cycle for probe 1 measurements Pin 13 The resistor connected between this pin and ground defines the charging current at pin 12 Typically 12k the value should be within the range 3k to 15k Pin 14 A low leakage capacitor typical value 01 mF and not greater than 047 mF should be connected from this pin to the regulated supply at pin 11 to act as a memory capacitor for the probe 1 measurement The internal leakage at this pin is 2 nA max for a long memory retention time Pin 15 Feedback input for the internal supply regulator nor- mally connected to VREG at pin 11 A resistor may be connected in series to adjust the regulated output voltage by an amount corresponding to the 1 mA current into pin 15 Pin 16 Linear voltage output for probe 1 and probe 2 capa- ble of driving up to g10 mA May be connected with a 600X meter to VREG 4 |
同様の部品番号 - LM1042 |
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同様の説明 - LM1042 |
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