I need an ADC with at least 8 channel for audio signal (so 20kHz-> 40kHz conversion time) to be connected to 8 microphone for input and a raspberry or my pc for "localize sound" project.
Can you suggest me one please?
Thank you very much
So you want 8 channels of ADC. We do not make an 8-channel audio ADC. We have several quad ADCs with different features. I think you would want the AD1974. It is a quad ADC and you can daisy chain them together to give you one TDM 8 data stream to interface into the Arduino. It is capable of running at 32kHz sampling rate without much trouble.
Another option is the ADAU1372. It is also a quad ADC but it also has PGAs on the input so it is a mic preamp along with the converters. It also can be daisy chained to obtain 8 outputs.
The others are the ADAU1977, ADAU1978 and ADAU1979. These are a bit more complicated parts but they may suit you.
Thank you very much for your response.
I have noticed the evaluation board EVAL-AD1974, what is it? I mean, is it a board using the AD1974 ready to use?
It will be simpler if I can connect it to my Raspberry pi.
For an 8 channel, audio quality, ADC you could also try the AD7768. The output data rate can be adjusted to 48kSPS and we have seen some customers using it in the audio space.
Thank you very much.
Considering the AD7768, I have noticed the AD7768 Evaluation Board.
Can you please explain me what is it? It is only for evaluation purpose or I can work with its digital output of the channels?
I am asking it cause I don’t think I will be able to make a chip work.
All of ADI's ADCs come with an evaluation board. In general this is for evaluation purposes. The board contains all necessary components such as the voltage reference, driver amplifiers, LDOs and any other external circuitry needed. There are some customers that will also use the boards for development. They can be used in conjunction with a PC and the supplied software, or as a standalone board if you develop your own software.
Unfortunately we cannot supply the source code for the eval board, just an executable file. So my guess is you would need to do some development here. The data is displayed in a graphical format. The user guide shows each of the tabs where the data is displayed. AD7768 User Guide
We also provide drivers which could be used to interface to the AD7768 for your project. Those are listed in the main project page here: AD7768 Datasheet and Product Info | Analog Devices
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