INA351: INA351

Here is a list of instrumentation amplifiers that allow G = 100 and that have a small package: ti.com/amplifier-circuit/instrumentation/products.html#261011=3;9&773min=0.1;100&773max=100;10000

With those, you cannot get smaller than WSON 3 × 3 mm². (And you need an external resistor to configure the gain.)

Hi Liu,

If you are looking to have a Gain = 100V/V, then the link that Clemens created shows you all of instrumentation amplifiers that would meet the gain specification.

Among that list of devices, the smallest package that is offered is a 3mm x 3mm, as Clemens mentioned, which is not as small as the RUG. Alternatively you could buy a quad op amp like the OPA4991, TLV9054, TLV9004, etc, and build a discrete solution using a RUC package (2mm x 2mm). However, with the additional space taken from the external resistors make the 3mm x 3mm integrated solution more desirable from a total system size.

Best Regards,

Robert Clifton 

The INA333 has enough drive strength to directly drive most ADCs.

Hi Liu,

INA351 can interface directly to low-speed 10-bit to 14-bit ADCs. 

Best Regards, 

Robert Clifton