Hello Team,
during my investigation I did not find any usefull comparison between the PGA308 and PGA309.
I know, I don't need any external EEPROM for the PGA308 but I don't know anything about the internal differences.
Do you have here any helpfull overview between the differences?
Best regards
Simon
HI Simon,
The PGA308 and PGA309 have similar amplifier cores. From the functionality perspective, the main difference is the PGA308 offers offset and gain error adjustment calibration, while the PGA309 offers offset, gain error initial adjustment calibration, and over temperature offset and gain error drift calibration, and sensor linearization circuitry.
The PGA308 offers offset and gain error calibration. The gain and offset calibration coefficients are stored on board in seven banks of one-time programmable memory (OTP). The power-on-reset OTP memory bank may be programmed four times, hence, the device can be re-configured up to four times with different calibration coefficients. The device is available on the MSOP-10 or 3x3 DFN-10 package. The PGA308 is configurable through a single wire universal asynchronous receiver/transmitter (UART)-compatible interface (1W pin). The PGA308 User's Guide offers a block diagram and detailed information about the device functionality:
The PGA309, in addition to offset and gain calibration, offers a temperature sensor to create calibration tables for offset temperature drift, and gain temperature drift calibration. Also the PGA309 incorporates a bridge excitation circuitry with sensor linearization. The PGA309 is available on the TSSOP-16 package. The device can be programmed via One-Wire, UART-compatible interface. The external EEPROM uses the Two-Wire interface. Communication to the PGA309 internal registers, as well as to the external EEPROM, for programming and readback can be conducted through either digital interface. The PGA309 User's Guide offers a block diagram and detailed information about the device functionality:
The amplifier cores of the PGA309 and PGA309 are similar, but there are other minor differences in the PGA front-end gains and output amplifier gains available. Please consult the PGA309 User's Guide and PGA308 User's Guide and the device datasheets for further details.
The following video also will provide a quick overview:
https://www.digikey.se/sv/ptm/t/texas-instruments/amplifiers-pga308309-overview/tutorial
Thank you and Regards,
Luis
