fbp
Newbie level 6
I am using the INA849 IC: https://www.ti.com/lit/ds/symlink/i...15411&ref_url=https%3A%2F%2Fwww.google.com%2F
I have observed the following limitations in this IC when I test it practically on a breadboard.
- When I increase the power rails form +/-5V to +/-15V power rails, the IC gets super hot. I’m guessing it would get defective when the IC gets super hot. The datasheet mention on page 13 that at +/-15V power rails, at 500kHz the output can reach upto 12V pp but the IC starts getting hot when I start increasing the the power rails from +/-5V.
My requirement is that with an input of 500kHz and 4 Vpp to the +/- of the INA (INA+ to the sensor positive and INA- to the ground of the same sensor), I need to see the same values at the output. So, implementing a unity gain INA would give me what I expect. But it does not work.
For the schematic, I am using the EVAL AD8224 Board. I desoldered the Dual INA AD8224 IC, and have implemented the INA849 IC using small wires (since the IC pin numbers do not match) just for testing the IC.
Schematic:
EVAL AD8224: https://www.analog.com/media/en/tec...ation-documentation/854884503AD8224_EVALZ.pdf
Please assist me. Is there something I am doing incorrectly during the test setup? I have checked my connection multiple times and continuity across each line, but it always gives me the same results. Have tested it with two different ICs, both give the same results.
Any help would be highly appreciated.
I have observed the following limitations in this IC when I test it practically on a breadboard.
- When I increase the power rails form +/-5V to +/-15V power rails, the IC gets super hot. I’m guessing it would get defective when the IC gets super hot. The datasheet mention on page 13 that at +/-15V power rails, at 500kHz the output can reach upto 12V pp but the IC starts getting hot when I start increasing the the power rails from +/-5V.
My requirement is that with an input of 500kHz and 4 Vpp to the +/- of the INA (INA+ to the sensor positive and INA- to the ground of the same sensor), I need to see the same values at the output. So, implementing a unity gain INA would give me what I expect. But it does not work.
For the schematic, I am using the EVAL AD8224 Board. I desoldered the Dual INA AD8224 IC, and have implemented the INA849 IC using small wires (since the IC pin numbers do not match) just for testing the IC.
Schematic:
EVAL AD8224: https://www.analog.com/media/en/tec...ation-documentation/854884503AD8224_EVALZ.pdf
Please assist me. Is there something I am doing incorrectly during the test setup? I have checked my connection multiple times and continuity across each line, but it always gives me the same results. Have tested it with two different ICs, both give the same results.
Any help would be highly appreciated.
