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Can anyone help me find the ADC section on this board?

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Rakalon

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Hi Guys,

I'm trying to locate the ADC section on this board. Would anyone know?

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Thank you
 
The ADC is IC34 in your last photo.
https://pdf1.alldatasheet.com/datasheet-pdf/view/206770/AKM/AK5357.html
You only need to Google the part numbers to find what each function does.

The microphone signals come down the ribbon cable to CN5. They are amplified by the two JRC2100 ICs, which are op-amps. Then the signal goes to IC34. I am fairly sure that there is a big processor on the underside of the board in the area with lots of holes between R20 and C48. That processor will read the signal digitally from IC34.
 
Here is the underside of the board.

I can't find the ADC. I'm a total noob to electronics and just a little lost. Could you help locate the actual part number on the boards? Sorry, I know I'm asking a lot

image7.jpeg
 
Its an old 8570 audio codec ic… Cant get that footprint anymore .. The main processor is next to the usb connector is a USB ic. I cant see a "main" processor.
The OP wanted to find the ADC, not the output amplifier.
Quite correct.... I was just admiring your logic....
 
Diver300 and Jony130 you two are brilliant! Thank you. This board is part of the Zoom H4n, an audio recorder

Here's another board from it.
 

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It actually contains an ADCs, as well as a DACs, so I'm not sure why the design needs the AKM5357 ADC as well. However, there are lots of possible reasons why separate ICs could be needed.
Two channels for the built-in mics (probably IC34 as it's very close to the preamps) and two more for the XLR mic inputs?
 
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