ADS5482EVM: EVM selection

Hi,

Looking down the list of connectivity options on that TMDSEVM I do not see anything that directly connects to one of our high speed ADC EVMs.    Most of what I see for that TMDSEVM platform are interfaces such as Ethernet or USB or the like.   The ADS5482EVM like nearly all our high speed ADC EVMs with LVDS signaling have a connector that connects to one of our FPGA-based capture cards such as the TSW1400.   There are no DSP or other processor platforms that have such a matching interface that I know of.  There is just too much data coming out of a high speed ADC to go into the usual general purpose IO for a processor platform such as what you are looking at.   For example, there is a TIDesign http://www.ti.com/lit/ug/tiduc79/tiduc79.pdf  that shows one of our ADC EVMs modified to connect to the Beaglebone development platform, but the data rate through the interface was much less than what the max sample rate of the ADC itself was capable of.   The most common application by far of interfacing with an ADC of 100Msps or more is to have an FPGA design first catch the data from an ADC to bridge the gap getting the data into some other processor - or having the FPGA itself do the processing. 

Regards,

Richard P.

Hi,

per the datasheet for the ADS4122 on page 56 table 23, there is a bit in the SPI register space to enable low speed operation.   This bit should be set for operation below 80Msps.   But the datasheet also says that for the ADS4122 the bit is already set by default for the device since this device is only meant for lower speed operation.  So you would not need to do anything but apply a reset to the device after powerup.

From the datasheet:

Table 23. Register Address DFh (Default = 00h)

7 6 5 4 3 2 1 0

0 0 LOW SPEED 0 0 0 0

Bits[7:6] Always write 0

Bits[5:4] LOW SPEED: Low-speed mode

For the ADS4122/42, the low-speed mode is enabled by default after reset.

00, 01, 10, 11 = Do not use

For the ADS4125/55 only:

00, 01, 10 = Low-speed mode disabled (default state after reset); this setting is recommended for

sampling rates greater than 80 MSPS.

11 = Low-speed mode enabled; this setting is recommended for sampling rates less than or equal

to 80 MSPS.

Bits[3:0] Always write 0

Regards,

Richard P.

Hi,

There is a SPI GUI installer available in the TI web site for the EVM.  This will allow the Windows PC that the GUI is installed on to control the configuration of the EVM through a USB port.  There is no additional hardware needed to configure the EVM.

Regards,

Richard P.

Anjana,

The min is 20 Msps. For parallel data, the output will also be 20MHz.

Regards,

Jim