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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LTC2420CS8 датащи(PDF) 36 Page - Linear Technology |
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LTC2420CS8 датащи(HTML) 36 Page - Linear Technology |
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36 / 36 page  36 LTC2420 RELATED PARTS PART NUMBER DESCRIPTION COMMENTS LT1019 Precision Bandgap Voltage Reference, 2.5V, 5V 3ppm/ °C Drift, 0.05% Max LT1025 Micropower Thermocouple Cold Junction Compensator 0.5 °C Initial Accuracy, 80µA Supply Current LTC1043 Dual Precision Instrumentation Switched Capacitor Precise Charge, Balanced Switching, Low Power Building Block LTC1050 Precision Chopper Stabilized Op Amp No External Components 5 µV Offset, 1.6µVP-P Noise LT1236A-5 Precision Bandgap Voltage Reference, 5V 0.05% Max, 5ppm/ °C Drift LTC1391 8-Channel Multiplexer Low RON: 45Ω, Low Charge Injection, Serial Interface LT1460 Micropower Series Voltage Reference 0.075% Max, 10ppm/ °C Max Drift, 2.5V, 5V and 10V Versions LTC2400 24-Bit µPower, No Latency ∆Σ ADC in SO-8 4ppm INL, 10ppm TUE, 200 µA, Pin Compatible with LTC2420 LTC2401/LTC2402 1-/2-Channel, 24-Bit No Latency ∆Σ ADCs 24 Bits in MSOP Package LTC2404/LTC2408 4-/8-Channel, 24-Bit No Latency ∆Σ ADC 4ppm INL, 10ppm TUE, 200 µA LTC2410 24-Bit No Latency ∆Σ ADC with Differential Inputs 800nV Noise, Differential Reference, 2.7V to 5.5V Operation LTC2411 24-Bit No Latency ∆Σ ADC with Differential Inputs/Reference 1.6 µV Noise, Fully Differential, 10-Lead MSOP Package LTC2413 24-Bit No Latency ∆Σ ADC Simultaneous 50Hz to 60Hz Rejection 0.16ppm Noise LTC2424/LTC2428 4-/8-Channel 20-Bit No Latency ∆Σ ADCs 8ppm INL, 1.2ppm Noise, Fast Mode 2420f LT/LCG 1000 4K • PRINTED IN USA © LINEAR TECHNOLOGY CORPORATION 2000 Linear Technology Corporation 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408)432-1900 q FAX:(408)434-0507 q www.linear-tech.com TYPICAL APPLICATIO The circuit shown in Figure 41 enables pseudodifferential measurements of several bridge transducers and abso- lute temperature measurement. The LTC1391 is an 8-to-1 analog multiplexer. Consecutive readings are performed on each side of the bridge by selecting the appropriate channel on the LTC1391. Each output is digitized and the results digitally subtracted to obtain the pseudodifferential result. Several bridge transducers may be digitized in this manner. In order to measure absolute temperature with a thermo- couple, cold junction compensation must be performed. Channel 6 measures the output of the thermocouple while channel 7 measures the output of the cold junction sensor (diode, thermistor, etc.). This enables digital cold junc- tion compensation of the thermocouple output. The tem- perature measurement may then be used to compensate the temperature effects of the bridge transducers. CH1 CH0 THERMOCOUPLE THERMISTOR CH3 OUT GND LTC1391 LTC2420 2420 F41 VREF VIN GND VCC VCC FO SCK SDO CS CH4 CH5 CH6 CH7 CH2 Figure 41. Pseudodifferential Multichannel Bridge Digitizer and Digital Cold Junction Compensation |
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