Can't get digital signal from iPad?


I picked up a used Topping D50  and was excited to try my old retired iPad as a streaming device.

Hooked up the camera connecting kit adapter to my iPad 2 (30 pin connector) then used a usb cable to the Topping and I get nothing! Well, the iPad continues to play out of it's speakers as if it's not recognizing the adapter maybe?  

Any ideas?
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30 pin does not do output just input, I found out myself by trying the method with my iPod iTouch 3.1.1 operating system plug in to a Schiit Bifrost 2
You might remember Wadia made ipod docks several years ago that did convert the digital signal into the dock, which had a DAC built in.  It also worked with ipads.  I had one of those so I know it's possible to do this.  Might be something quirky with the Topping DAC.  Sorry I can't be of more help.
What about with a newer iPad that has usb c?

I use the audio Midi settings on my MacBook Air to send a digital signal from a usb a to the usb b on my amp. I’d like to use an iPad instead. Any thoughts?
I'm guessing that's because it's a non powered DAC?  The Topping is plugged into a wall.

I'm wondering if the CCK I got was bad or if my USB cable is from it to the topping is bad.  
You may need to use a powered usb hub (I had to do this with my iPad Air 2) here’s a video that will provide a solution if that is the case. 

https://www.youtube.com/watch?v=0DKYLBuElng
I think you can only import to the iPad through the camera kit or sync certain other apple products.
It's supposed to if you use the camera connection kit that converts it to USB output.  It's supposed to provide a pure digital signal that you can then use with an external DAC.

I can hook up a memory card adapter and that pulls up photos app so it's recognizing adapters but not getting anything audio wise.
Not even sure if the 30-pin connection outputs audio at all.  You might need to use the 3.5mm output, but that’s just a guess.