Other Parts Discussed in Thread: TIPD104 , TIPD129 , LM7705 , INA326 Hi,
I would like to detect threhold current of 2.5uA, so i require a current shunt that has low input current. Is there any current shunt with voltage out put i can use? Also, due to mechanical…
Hello Jason,
Thanks for the additional information. I have been out of the office and will reply in greater detail early next week. On a couple of side notes, please understand that the noise of a 5kohm resistor is ~9nV/rtHz. Perhaps you'd be interested…
Other Parts Discussed in Thread: TIPD129 , TIPD156 , TIPD135 Dear Sir
We would like to measure 1mA~8A current and the Full voltage range is up to 2V (ADC input)
Have any solution could to this SPEC?
Thanks
Other Parts Discussed in Thread: OPA320 , LM7705 Hello,
I have a question about the this circuit: http://www.ti.com/tool/TIPD129 . We have designed it on our pcb, but due to recent changes our circuit changed from 5V to 3V. This means we have to adapt the…
Hello Anil,
Providing a 0.6V reference is a good idea. However, the one you suggest has just 1% initial accuracy. I assume you would like better performance.
Therefore I see a couple options. First, you could simply divide down your 3.3V supply and buffer…
Hello Paolo,
Detecting such a wide range of current is definitely challenging, especially given 1MHz BW. The options we typically see are either changing the gain of the device (e.g. using a PGA as in TIPD135) or switching in different sense resistors…
Hello Derek,
Can you please give us more information about your application? Also, is it possible to measure on the low side instead of the high side?
Please be aware that measuring 4 decades of load current is difficult enough itself and will likely…
There are several error sources to consider when sensing current (or using amplifiers in general) such as CMR, PSR, noise, gain error, and voltage offset drift, but two device properties (input bias current (I B ) and input offset voltage (V OS ) ) are critical…