https://www.analog.com/en/resources/design-notes/resolving-temp-differences-with-ltc2402.html
Design Note 257: Resolving Very Small Temperature Differences with the LTC2402 | Analog Devices
The LTC2402, 2-channel 24-bit, No Latency Delta-Sigma ADC, is well-suited to differential temperature sensing using number of different sensors.
https://www.analog.com/en/products/ltc2402.html
LTC2402 Datasheet and Product Info | Analog Devices
The LTC2401/LTC2402 are 1- and 2-channel 2.7V to 5.5V micropower 24-bit analog-to-digital converters with an integrated oscillator, 4ppm INL and 0.6ppm RMS...
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