Hi,
I am using AD8429 (gain = 1000 )to make biopotential measurements. As I use AC coupled inputs, I add a resistor to ground as discussed in the datasheet. I also compare the measurements using a CMOS front-end commercial biopotential amplifier.
The…
AD8429,AD8428
HI，dear
I am going to choose the AD8429 in my circuit design, the frequency of the signal is 400K, and the bandwidth is 80K, the gain is about 10. I found there is no gain bandwidth product of operational amplifier AD8429 in the datasheet. can you tell…
This Time I have no question, but I want to congratulate AD for being able to build the best instrumentation amplifier one can get - AD8429!
I just have tested it with gain of 6000 and the inputs clamped together.This amplifier is really awsome!
Even…
Emman:
During the tests, most of time, I was using the same gain resistor 249 Ohm on AD8429 and AD8421. So under the circuit same condition (even gain will be some different), AD8421 has spikes while AD8429 does not.
Best regards,
John
A little more information for other people facing a similar problem. I was able to get my output noise measurement down to 162 nV/rtHz ( I had some extra resistance at the input that wasnt exactly matching the circuit above).
I also noticed the datasheet…
Thanks for the prompt response and also for the tip on the AD8429. This could be worth considering.
My last idea is to use schottky's to isolate the supply pins for the AD8429. Input pin current would only
flow to AD8429, so it would not exceed Iq .
In the attached drawing, there is a bypass capacitor between the supply pins. It should really…
AD8429是一款低噪声的仪表放大器。我是将AD8429用在电阻率测井接收电路的最前端，将感应线圈与电阻串联后，直接将仪表放大器AD8429两输入端并联在电阻两端。
AD8429有极低的噪声，对于感应测井，信号一般都在几个毫伏，低噪声的AD8429能够提取出更多的有用信号，且就一般的感应测井接收电路，都是用三个放大器组成的仪表放大器，直接运用AD8429能够极大的简化设计，且AD8429能够根据串入电阻的大小，决定放大倍数。这也给设计带来了很多方便。
I build diff-to-single conversion using AD8429: but the output seems to be negative shifted.
The outputs are great!
Thanks for your reply!!