PGA103: OFFSET

user5163865

Genius 3505 points

Part Number: PGA103
Other Parts Discussed in Thread: PGA113

Hi,

OFFSET in the data sheet is described as "RTI".
I usually think of it as "Refered to input".

As the RTI value seems to have a large offset, is the OFFSET value already multiplied by GAIN?

Best regards,

Hiroshi

over 1 year ago

0 kai klaas69 over 1 year ago

Guru 140200 points

Hi Hiroshi,

this is a general purpose programmable gain amplifier and it is from 1993. The offset voltage of PGA103 wasn't high at that time. If you need a lower offset voltage, though, then take a TI's todays zero-drift programmable gain amplifier:

https://www.ti.com/amplifier-circuit/pga-vga/products.html

Kai

0 Luis Chioye over 1 year ago in reply to kai klaas69

TI__Guru 52796 points

HI Hiroshi,

Yes, the PGA103 is an older device offering gains of 1, 10,100-V/V.

Among the precision programmable gain amplifiers with single-ended output, if the application can accommodate allows for a smaller supply of 5.5V (max), the PGA113 offers gains of 1, 2, 5, 10, 20, 50, 100, 200V/V with two mux channels. RTI offset is in the ±25µV typical (±100μV max) when AVDD = DVDD = 5 V, VREF = AVDD/2.

Thank you and Regards,

Luis

0 user5163865 over 1 year ago in reply to Luis Chioye

Genius 3505 points

Hi Kai san, Luis san,

Thank you for your support.
I will introduce a new product to our customer.

Best regards,

Hiroshi

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PGA103: OFFSET