I have some unclear questions needed to clarify with you.
In the datasheet, the input bias current with respect to differential input voltage for VCM = 0 and VCM=5V as shown below, Pic 1 and Pic 2. Figure 11 shows another input bias current specification with respect to input common mode voltage. How should I use all these data ? If my Vcm is > 10V, what is the “input bias current” for specified differential input voltage? And what will the variation for the worst case analysis?
Attached below is the internal circuit of AD8215, Pic1 and Pic2. Thanks.
We are looking into this. Meanwhile, you may want to read these articles as well as some previous threads on engineerzone which discusses current sense amplifier and its source of error:
Articles: High-Side Current Sensing: Difference Amplifier vs. Current-Sense Amplifier
Electromagnetic Interference (EMI) Filtering Reduces Errors in Precision Analog Applications
External input filtering effect on high side current sensors such as the AD8210?
Ensuring current sense output is accurate?
Ensuring current sense output is accurate?Ensuring current sense output is accurate?How do input offset specifications relate to total output error for current sensors?
Thanks and best regards,
Can you send to me the application note of AD8215?
Apologies for the delay of response. The application note for AD8215 can be found on page 11 of its datasheets. What is your specific application? I might still suggests some useful technical notes depending on your applications.
For the simulation tool, AD8215 doesn't have a spice model but you can actually use the spice model of the AD8211 since they have pretty much the same performance and specifications. The main difference between the two is their package type. AD8215 comes with SOIC while AD8211 is in SOT-23 package. So you may to download our free NI Multisim ADI Edition to simulate your application circuits but take note that the free license of this will expire until May 31 2014 only.
You can download it here: http://www.analog.com/en/amplifier-linear-tools/multisim/topic.html
I hope this helps!
May i know what's the suggested resistance values needed for R1 and R (VCM is 10-16V) as below?