We have to place the gain amplifiers for several sensors in a very tight space. Looking at the INA330, the part count is very low. Now, it is descrbed as an amplifier for temperature control, but looking at the datasheet, it looks like if we adjust the gain resistor to a lower value and lower the control point voltage we could obtain a measurement over a wide temp range (we need -40C to +50C).
Setting it up, though, we are not getting the intended result. In fact, we tried the test circuit and we're still not seeing it work. The swing from 0 (ice tray) to 20 C is only about 0.2V. It doesn't seem to matter what size resistor we use for Rg and the voltage, it is not changing the gain.
We put a precision resistor (10K) for Rset and a 10K thermistor on pin 10, and to ground. Vexcite on pins 2 and 3 is 1 V. We tried external supplies and a voltage divider from Vcc but no difference. One thing unexpected - just putting the part down on the PC board with nothing else but the precision 10K populated, the resistance was measured to be about 4.1K. The thermistor comes up at about 8.4K at room temp.