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LTC2402 数据表(PDF) 27 Page - Linear Technology |
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LTC2402 数据表(HTML) 27 Page - Linear Technology |
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27 / 32 page  27 LTC2401/LTC2402 APPLICATIO S I FOR ATIO at VIN = VB = FSSET, see Figure 29. Similarly, the offset errors due to RP2 are removed by the ground sense input ZSSET. The absolute zero output of the ADC (data out = 000000HEX) occurs at VIN = VA= ZSSET. Parasitic resistors RP3 to RP5 have negligible errors due to the 1nA (typ) leakage current at pins FSSET, ZSSET and VIN. The wide dynamic input range (– 300mV to 5.3V) and low noise (0.6ppm RMS) enable the LTC2401 or the LTC2402 to directly digitize the output of the bridge sensor. The LTC2402 is ideal for applications requiring continu- ous monitoring of two input sensors. As shown in Figure 30, the LTC2402 can monitor both a thermocouple temperature probe and a cold junction temperature sen- sor. Absolute temperature measurements can be performed with a variety of thermocouples using digital cold junction compensation. The selection between CH0 and CH1 is automatic. Initially, after power-up, a conversion is performed on CH0. For each subsequent conversion, the input channel selection is alternated. Embedded within the serial data output is a status bit indicating which channel corresponds to the conversion result. If the conversion was performed on CH0, this bit (Bit 30) is LOW and is HIGH if the conversion was performed on CH1 (see Figure 31). Figure 29. Transfer Curve with Zero-Scale and Full-Scale Set Figure 30. Isolated Temperature Measurement 00000H 12.5% UNDER RANGE FFFFFH ZSSET FSSET VIN 24012 F29 12.5% EXTENDED RANGE VCC FO FSSET ZSSET SCK CH1 SDO GND CS THERMOCOUPLE COLD JUNCTION ISOLATION BARRIER PROCESSOR CH0 – + 110 12k THERMISTOR 100 Ω 9 8 7 6 2 3 4 5 2.7V TO 5.5V LTC2402 24012 F30 |
类似零件编号 - LTC2402 |
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类似说明 - LTC2402 |
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