Do ADS12XX circuit need an amplifier?
Both the ADS1263 and HX711 have programmable gain amplifiers in front of their ADC units.
The PGA on the ADS1263 can be set to x1, x2, x4, x8, x16 or x32.
The PGA on the HX711 can be set to x32, x64 or x128.
Other TI chips that have PGAs include: ADS111x, ADS1018, ADS124x.