Tuesday, September 04, 2007

Toward More-Compact Digital Microphones

As electret microphones become smaller, their element capacitance decreases. JFET preamps no longer suffice, as their relatively large input capacitance attenuates the signal from the microphone. Much can be gained by replacing JFET amplifiers with CMOS analog and digital circuitry, including easier gain setting, multiple functional modes, direct digital outputs, enhanced sound quality, and higher noise immunity.

9 Comments:

At 6:31 PM, Anonymous Anonymous said...

A well-written article and interesting device, but let down because there isn't any data for the adau1301 on the website at 6/Sep when AnalogDialogue was mailed out.

 
At 12:19 PM, Anonymous Anonymous said...

Yes, Where is this part? I could use this in a consumer device I'm designing, but it seems to not actually exist!

 
At 12:59 PM, Anonymous Anonymous said...

A well-written article - can you show us the practical side how to use this device in the real world what type of chip decode the 2.4MHz signal into row data - who support this protocol?

 
At 5:08 AM, Blogger Hammel said...

We're happy to learn of your interest in our device. I can assure you that the device exists, but is presently only available in custom variants for specific customers.

An open market part is being developed. If you're interested in learning more, please let me know at: jannik.nielsen@analog.com

WRT decoding the data, any DSP chip should be able to implement a sigma-delta decimator to get a regular digital word.

 
At 3:03 PM, Anonymous Anonymous said...

Do you have a full datasheet for this part? Would be interesting to see details and compare results

Thank you

 
At 3:07 PM, Anonymous Anonymous said...

Is the MEMS microphone released?
When is it going to be published?

 
At 10:12 AM, Blogger Analog Dialogue said...

Datasheets on the MEMS microphones can be found at:

http://www.analog.com/en/audiovideo-products/imems-microphone/admp401/products/product.html

http://www.analog.com/en/audiovideo-products/imems-microphone/admp421/products/product.html

 
At 6:24 AM, Blogger 藜月 said...

Can you sent me the ADAU1301's datasheet?

 
At 8:52 AM, Blogger Analog Dialogue said...

Please send me your email address or other contact information so that I can send you a datasheet.

Regards.
Scott

 

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