Designing a single purpose microcontroller - Page 1
Forum section: electronics / general

author: terry_dactle
author_rank: Newbie
timestamp: September 02, 2018, 06:31:16 am
content: Who would I go to, to design and manufacture a microcontroller for the sole purpose of being a 14 bit ADC for RCA outputs with I2C inputs for expandability?Basically I want to design 2 microcontrollers, a master and a slave to convert the analog signals from an RCA from a preamp then the slave will convert it back.Thanks in advance.

author: Gribo
author_rank: Frequent Contributor
timestamp: September 02, 2018, 02:32:18 pm
content: You should go to the major MCU vendors. I am sure they will be happy to give you a few million USD quote for such a job. The alternate route is to find an MCU with the desired features. AD and TI both have such devices, at various price points.

author: terry_dactle
author_rank: Newbie
timestamp: September 03, 2018, 05:52:07 am
content: Fair point, thanks for the input.

author: Eka
author_rank: Regular Contributor
timestamp: September 05, 2018, 02:05:19 pm
content: I wouldn't be surprised it it doesn't already exist, but I'd expect it to be 16+ bits versus only 14 bits.STM32F072VBT6 could do it at 12 bits. Just add hardware to interface the DAC and ADC to the phono jacks. STM32F373 series has a built in 16 bit ACD. It would need an output DAC of 14 or 16 bits. I'm betting some manufacturer already has one with the appropriate 16 bit ADC, 16 bit DACs and audio analog IO hardware to allow direct connection the the phono jacks. Ask over in the "Microcontrollers & FPGAs" area if somebody knows of existing ones.A quick search turned up hundreds of single board computers that have 16 bit stereo audio input and output interfaces, plus advanced communications so the data could be transmitted over the network, or a dedicated set of wires.If you want to make 10,000+ of them, custom silicon is a good option because it can handle most of the analog as well as the digital, and put it into a small but simple to solder package. That would simplify the schematic and PCB greatly.

author: ebclr
author_rank: Super Contributor
timestamp: September 05, 2018, 04:22:36 pm
content: Take a lockhttp://www.ti.com/processors/dsp/media-processors/audio/overview.html?utm_source=GOOGLE&utm_medium=cpc&utm_term=%2Baudio%20%2Bprocessor&utm_campaign=PRO_CAT_SCP_WW_N_M_SP&utm_content=42a89062-f1da-44f6-b114-d563c60ddaae&gclid=CjwKCAjw_b3cBRByEiwAdG8Wqscj5scDRfiWc7fZECpCF50h36rNlmJlJF9c7WxxfG561bY5g0byWxoCSDUQAvD_BwE

author: SiliconWizard
author_rank: Super Contributor
timestamp: September 07, 2018, 02:34:57 pm
content: At what max sample rate?Analog Devices notoriously has a whole range of MCUs with embedded converters up to 24-bit:http://www.analog.com/en/products/processors-dsp/microcontrollers.html

author: PCB.Wiz
author_rank: Super Contributor
timestamp: September 17, 2018, 06:15:47 am
content: Quote from: terry_dactle on September 02, 2018, 06:31:16 amThat's rather too vague to go to anyone with.You have just broadly described an audio CODEC, and those are made by the shipload.but you need to define the sample rate, and S/N expected for your ADC and DACs, and if you want this to be Stereo or Mono, or > 2 channels etc