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16-Bit Resolution Unidirectional Current Sense into LTC2433 ADC 2-Channel ADC Measures Differential Temperature from Bridge Configured RTDs APD DC Coupled Current Monitor from 20V to 90V APD Bias Bridge Reversal Eliminates 1/f Noise and Offset Drift of a Low Noise, Non-Autozeroed, Bipolar Amplifier Complete Type K Thermocouple Measurement System (I2C) with Cold Junction Compensation Complete Type K Thermocouple Measurement System (SPI) with Cold Junction Compensation Full-Bridge Amplification Using a Resistor Arrays to Provide Precise Matching in Excitation Amplifier Full-Bridge Amplification Using a Single Amplifier Full-Bridge Amplification Using Autozero Amplifiers to Reduce Input Referred Noise High Linearity Components Simplify Direct Conversion Receiver Designs High Resolution 0°C to 220°C Platinum RTD Temperature Digitizer using 5V Supply High Resolution Type S Thermocouple Digitizer with Improved Cold Junction Compensation Measuring Seven RTD Temperatures with One Reference Resistor and One Reference Current Pseudodifferential Multichannel Bridge Digitizer and Digital Cold Junction Compensation Remote Half Bridge Digitizer Platinum RTD with Noise Suppression on Reference RTD and Thermocouple Remote Temperature Digitizer Single 5V Supply Linearized 0°C to 400°C Platinum RTD Amplifier Single Supply 16-Bit ADC Driver Split or Single Supply Operation, Bidirectional Output into A/D The LT1993-2 Driving an LTC2255 ADC Sampling at 96.12Msps with a 70MHz, 4-Channel WCDMA Signal
This circuit enables pseudodifferential measurements of several bridge transducers and absolute temperature measurement. Consecutive readings are performed on each side of the bridge by selecting the appropriate channel on the LTC2428. 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 thermocouple, 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 junction compensation of the thermocouple output. The temperature measurement may then be used to compensate the temperature effects of the bridge transducers.