Hi, guys~
I would like to know whether the offset voltage of an AD8228 chip is a specific value or it depends on some factors?
And I'm also interested in how can I measure it because it is so small.
Thanks in advance~
xcuresme
Dave,
What industry are you in? 30 years ago, the downhole guys would take a commercial part, test it at high temp, and if it
survived 100 hours they would go with it. The high temp line from ADI allows them to go a lot more than that, so it saves
them…
Dear Emman:
Thanks for your reply. I used 500m ohm Rsense for current measure and Gain=10 of the AD8228. Actually , I had used AD8228 simulation tools on ADI website and below picture is simulation result , Do you have suggestion for this…
If a SPICE model is available, it is located under the "Tools, Software & Simulation Models" link on our product page.
For example, for the AD8228 fixed gain instrumetation amplifier, the product page is here:
http://www.analog.com/en…
Sorry for my careless, Correct setup of AD8253 as below:
+VS=7.5V
-VS=-5V
REF=GND
A0/A1=GND
WR=-5V
For schematic of the input side , We tried to tie +IN/ -IN to GND to watch offset of AD8228. but It measure 5.7V…
I'm experiencing the same problem. And the AD8228 model is not correct too.
I am developing a precise current sensor based on shunt and instrumentation amplifier AD8228 sensing the load current of H-bridge.
Figure 1 is the H-bridge. The switches are IGBT switching at 30k~40k on fixed duty cycle. Vsense is the voltage of shunt…
如上图，最近看到了一个将精密放大器作为压控振荡器的应用（根据本人判断），在将压控振荡器输入端口与外电路断开，用示波器在波形输出端口能测得连续的锯齿波输出。按上述图制作PCB并购买零件安装却没有得到正确的振荡输出，测试发现在上电或断电瞬间有振荡波形输出，且频率较低。第二张图片为截取的AD8228内部原理图。
问题：此电路能否构成振荡，起振条件，影响振荡频率的关键参数。
AD8228不同制造商是否存在零件差异(手头有表面白色衬底的和没有白色衬底的两种芯片）
两种芯片在同一电路中各点测试电压严重差异…
Here is my netlist
* C:\Users\ROSE\Documents\ADIsimPE\inst_amp.wxsch
*#SIMETRIX
V1 V1_P 0 5
V2 U1_VS- 0 -5
V3 V3_P 0 1
V4 V4_P 0 0
X$U1 V4_P U1_RG1 U1_RG2 V3_P U1_VS- 0 U1_OUT V1_P AD8220 pinnames: IN- RG1 RG2 IN+ VS- REF OUT VS+
.op
*.TRAN …
Hi, xcuresme.
I already contacted the applications engineer of AD8228 regarding the PCB layout and the detailed schematic diagram of the EVAL-INAMP-82RZ. I'll keep you posted on this.
Regards,
Anna