GXSC GX7793 Compatible with AD7793 for RTD Measurements

Temperature measurement is one of the most commonly used detection techniques in the analog field, and many measurement techniques can be used to detect ambient temperature. Thermistors are a small and simple 2-wire solution with fast response times, but their non-linearity and limited temperature range limit their accuracy and applications. RTDs, on the other hand, are the most stable and accurate temperature measurement method.

RTD temperature measurement systems are usually low-speed, so narrow-band ADCs are more suitable, but ADCs must have the narrow-band and high-resolution requirements, making sigma-delta ADCs ideal for this application, and the recommended use of the GXSC ADC GX7793 in RTD measurement systems. the GX7793 is built with a precision low-noise, low-drift internal bandgap reference voltage source, and it also The GX7793 has a built-in precision low-noise, low-drift internal bandgap reference voltage source and can also utilize an external differential reference voltage. An integrated low-noise instrumentation amplifier allows direct input of small signals.

The advantages of the GX7793 for RTD measurement systems are as follows:

The GX7793 is a low-power, low-noise, complete analog front-end for high-precision measurement applications. The GX7793 has a built-in low-noise 24-bit sigma-delta ADC with three differential analog inputs, and an integrated on-chip, low-noise instrumentation amplifier, which allows direct input of small signals. When the gain is set to 64 and the update rate is 4.17Hz, the root mean square noise is 52nV.

The GX7793 has a built-in precision low-noise, low-drift internal bandgap reference voltage source, and an external differential reference voltage can also be used. Other on-chip features include a programmable excitation current source, fuse current control and bias voltage generator. Bias voltage generation can be used to set the common mode voltage of a channel to AVDD/2. 3.

3, GX7793 can use internal clock or external clock operation, the output data rate can be set by software programming, can be varied in the range of 4.17Hz to 940Hz.

4、The GX7793 is powered by a 2.7V to 5.25V supply with a typical power consumption of 355µA and is available in a TSSOP-16 package.

GX7793 performance parameters:

-Maximum 23-bit effective resolution;

-Root Mean Square (RMS) noise: 34nV (at 4.17Hz), 77nV (at 16.7Hz);

-Power consumption: 355µA (typical);

-Update rate: 4.17Hz to 940Hz;

-Compatible with AD7793;