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ADC GX7793 in Weighing Instrument, Replace AD7793

Time:2024-06-14 Views:598
Supported by the rapid development of electronic technology, weighing instruments from a single weighing display bureau to integrated, multi-functional and intelligent high-end instrumentation direction, however, with the increasingly fierce competition in the market, but due to the different design, the price gap is also larger, especially in the high-end weighing instruments. In fact, in addition to the function of high-end weighing instruments, mainly high resolution, of course, also includes the shell of the materials used, etc..

At present, many weighing instruments using double-integral or triple-integral ADC, not only power consumption, the area is also large, the resolution is generally only 16 to 18 bits, anti-electromagnetic wave interference ability is poor. Especially when the power of electromagnetic wave increases to a certain degree (such as walkie-talkie), it will cause more obvious interference to the weighing data, making the reading unstable, thus affecting the normal weighing measurement.
The GX7793 in TSSOP package with low power consumption and 24-bit high resolution is very suitable for applications where wireless transmitter/receiver is nearby, and the application of the weighing instrument improves the performance and reliability of the weighing instrument. 

The following are the performance characteristics of GX7793 ADC:
1, GX7793 is a low-noise 24-bit sigma-delta ADC, which contains three differential analog inputs, but also integrates an on-chip low-noise instrumentation amplifier, and thus can directly input small signals, the root-mean-square (RMS) noise is 52nV when the gain is set to 64 and the update rate is 4.17Hz.
2, GX7793 built-in a precision low-noise, low-drift internal bandgap reference voltage source, but also can use an external differential reference voltage. Other on-chip features include a programmable excitation current source, fuse current control and a bias voltage generator. The bias voltage generator can be used to set the common-mode voltage of a channel to AVDD/2.
3,The GX7793 can operate with either an internal or external clock. The output data rate is programmable by software and can be varied from 4.17Hz to 940Hz, and is powered by a 2.7V to 5.25V supply with a typical power consumption of 355µA.