Q1. What is the ADA4622-4 / ADA4622-2 / ADA4622-1?
A1. The ADA4622-4 / ADA4622-2 / ADA4622-1 is the next generation of the AD824 / AD822 / AD820. It is a single supply, 30 V, 8 MHz, Low Bias Current, Single-Supply, RRO, Precision JFET Op Amp.
Hi Mochi,
This is a typo in the data sheet and will be fixed in the upcoming Rev.C data sheet. The correct values for a 5V supply are shown below.
Regards,
Rob
VOL
I read Datasheet of ADA4622-1/ADA4622-2/ADA4622-4(Rev. D).
I have a question.
IN ELECTRICAL CHARACTERISTICS, VSY = ±15 V Current Noise Density is 0.8fA/√Hz. (Rev. D | Page 4 of 37)
I See.
IN ELECTRICAL CHARACTERISTICS, VSY = ±5 V
hi Hary,
in fact I will be mostly using it for DC measurements, ADA4622-2, ADA4610-2 seem to have large offset, ADA4000-2 even bigger.
Mike
I would not do a new design with the AD822; the ADA4622-2 is the next generation part with much better
specs and lower price. Usually rule of thumb for gbw variation is +/-20%.
Harry
The AD822 is over 20 years old and the next generation part, the ADA4622-2 is released.
It has a spice model and the data sheet lists differential and common mode capacitance.
I'm curious about the shutdown/disable feature of the ADA4622-1.
What is the impedance looking into the ADA4622-1 at its inputs and output when the part is in shutdown? I like the idea of a circuit like Figure 99 of the datasheet, but what extra load…
What about the ADA4622 ? This one does not seem to have the differential limiting input.
Hi John,
Firstly, I would say if you are using the ADA4622-2 that this amp may struggle to drive the AD7768-4 directly on it's own. Generally we would need to use an additional driver amplifier between it and the ADC to settle the input to the ADC due…
参考ADA4622-2手册中推荐的电路设计的峰值检测电路，因ADA4622-2未到货，用AD828替代。发现输出（N1:7脚）总是会振荡，且放大器发热严重，但充电电容上的电压基本接近需求（N1:5脚）。尝试C3、C5使用3.3pF、51pF、100pF电容，断开R5，将R4换成10k，去除VD2（排除结电容影响）均不能解决问题。请问该如何处理？波形图中已有颜色标注信号来源。