图3是对图2的输出波形进行放大，图2波形相对于图1只是更换了输入信号源，滤波电路设置Cav为10uf容值，然后输出波形交流分量变得很大。

Hello Emman,

Just I would like to know as following.

I am confirming your Fig.8 on AN-268 page6/12.

It show at CF=0uF condition.

So I have a question, if CF become large value eg.1uF,10uF,,,,, how does CAV-line move to?

I need the its characterristic…

关于RMS-DC我一直使用的是AD637,性能卓越,用它的时候你也需要注意几个地方,1,没有必要的时候缓冲器不要使用,RMS OUT有很强的驱动能力,可以直接驱动ADC或万用表.2,CAV的大小在不同的信号频率直接影响到一个转换速度,这个速度在决定你读值,如果你太快它就会影响你的一个精度.所以要看你现在测量的是什么信号,频率是多少?再去确定CAV的值,这样问题就解决了.如果你还有什么问题你可以直接联系我.

Hi George,

I also want to verify the schematic of your customer. Are you referring to the Figure 29: External Scale factor Trim or Figure 30: dB Output Connection?  Also where the 22 ohms was inserted, between the -Vs(Pin 4) to Cav or Pin 4 to ground…

建议你试一下数据手册中图8或图11的电路。在数据手册中介绍了一些关于Trim的方法。还有就是电容值的计算。你可以根据那个算一下你选的Cav是否合适。

HI,

Refer below thread:

http://ez.analog.com/thread/1157?tstart=1020

Best Regards,

Prashant

Hi Klaus,

I Got PCB done with AD636, It is working fine, But the response time is bit slow and I think that can be adjusted with Cav()C3 capacitor by lower it.

I need to check AD736 as well I think It should also work with the same circuit I have Uploaded…

1. 输入1V正弦波，输出要建立到0.99V，也就是1%精度是需要时间的，就是纵轴。

2. 1ms的转换时间很短，参考Figure13，你需要小的CAV，比如10nF，此时20kHz的信号建立到0.01%误差需要，10mS。建立到0.1%的误差，可能为1ms。

The device will handle formats up to 720p/1080i with output of YCrCb 20 bits which fulfills some of the BT.1020 specifications.  The ADV7181C LLC is limited to 110MHz so it can not output 1080p60

Thanks for the schematic, it shows up well. Here are a couple of observations:

1. Assuming you used figure 28 as a guide, the 100k/4.7uF array creates a floating reference for the AD736, so the circuit is no longer referenced to the same ground as your…