8 channel DAC

Hello Shafeeq, 

Please clarify - the title says DAC, but the questions says ADC.

Thank you,

~Leonard   

Hi Leonard,

Sorry for the confusion.

We are looking for DAC.

Best regards,

Shafeeq 

Hi Shafeeq,

The interface type will be an important parameter in order to achieve the sampling rate. Clemens suggested a parallel interface DAC which have a faster update rate but they require one GPIO control per data bit and possibly more for any configuration settings. 

Do all 8 channels need to be updated within 4MSPS, or is it 4MSPS per channel? We only support SPI, I2C, or parallel interfaces (edit: in the precision DAC group). Most of our DACs in the precision DAC group have a maximum SPI clock speed of 50MHz and the typical DAC takes 16-24 clocks to update the output. This would be ~2MSPS per channel. I2C has a lower max speed. We do have faster DACs in the high speed group that can achieve faster speeds. I can move this thread to that forum if you are interested. 

Here is the ti.com overview page: https://www.ti.com/data-converters/dac-circuit/high-speed/overview.html

Best,

Katlynne Jones

Hi Katlynne,

Thanks for the reply.

We need 4 MSPS per channel.

Please suggest if you have any parts in high-speed DACs.

I would like to have maximum channels per part, because we need a total of 96 channel in our board. So it will be difficult to use single channel or dual channel DACs.

Interface can be parallel or lvds or any

Please suggest 

Best regards,

Shafeeq 

In the precision DACs group, the DAC7822 is the 4 MSPS device with the highest channel count.

In the high-speed DACs group, there are four-channel devices, but they begin with the DAC3484 that can do 1250 MSPS and eats 1.2 W.

Is there any other parts with 10 bit and 2 MSPS.

We need a total 96 channels in our board. So with both suggested parts the I/O count for 96 channels is very huge.
Please suggest if any better option is there.

Best Regards,
Shafeeq

Hi Clemens and Katlynne,

Thanks for the reply.

Is there any 2 channel devices ?

We prefer classic or dual or quad spi for 2 channel  as parallel or lvds will result in adding more I/Os for our total 96 channels in our board.

Note:We can't use predefined waveforms.

Please suggest if you have any parts.

Best regards

Shafeeq 

Hi Shafeeq,

Unfortunately, my original statement still stands. With a 50MHz SPI clock and a 24-bit update sequence you would be limited to ~2MSPS per channel. So, ~1MSPS for a two channel device. 

Best,

Katlynne Jones 

Can you let me know the 1MSPS part?