6 Channel ADC with OMAP-L138

Hi Tariq,

The UPP can handle single data rate (SDR Mode) at 13.33 ns operated at (1.3V&1.2V) that is 75MHz of frequency, I hope this can satisfy your sampling rate requirement 6 MHz for 12 channels.

For serial interface McBSP is the right peripheral to interface analog-to-digital (A/D) .The maximum data rate achieved by this peripheral is  50 MHz  (Minimum 20ns Cycle time)

Note:

Though it depends upon ASYNC3 period, we need to take whichever the value is greater, So, I took 20ns. The maximum usable speed may be lower due to EDMA limitations and AC timing requirements .Please refer the datasheet for more details

I believe UPP is the right choice for your applications.

Regards

Antony  

--------------------------------------------------------------------------------------------------------
Please click the Verify Answer button on this post if it answers your question.
--------------------------------------------------------------------------------------------------------

Hi Antony,

Thanks for your reply.

What 6 channel A/D converters are available with UPP interface for OMAP-L138 ? 

-Tariq

 Tariq,

Please check with TI data converter products or other vendor for the suitable ADC.

http://www.ti.com/lsds/ti/analog/dataconverters/data_converter.page

ADS7864 may be a better fit for uPP based on the signal descriptions.  However, you will probably need additional logic to make this work since both ADCs seem to require additional control signals that are not part of the uPP protocol.

Regards

Antony

• --------------------------------------------------------------------------------------------------------
  Please click the Verify Answer button on this post if it answers your question.
  --------------------------------------------------------------------------------------------------------

Hi Antony,

ADS7864 has 500 kHz sampling rate which doesn't full fill my requirement.

By using the link you mentioned, I found only few ADCs and most of them have serial or parallel LVDS interface which makes it more complicated to interface with. Am I right ?

ADS5120 and ADS5121 have Parallel CMOS Serial SPI Interface, for example,

http://www.ti.com/product/ads5120

Does it mean that both has Parallel CMOS and SPI interface ? Do you think, I can interface it with OMAP-L138 ?

I appreciate your help.

Thanks.

Hi Tariq,

Yes , you can prefer SPI interface, which can be interfaced to the OMAP-L138

Regards

Antony

• --------------------------------------------------------------------------------------------------------
  Please click the Verify Answer button on this post if it answers your question.
  --------------------------------------------------------------------------------------------------------