LMS6002D support of LTE

John Orlando john at epiqsolutions.com
Sat Oct 13 21:11:37 UTC 2012

On Sat, Oct 13, 2012 at 3:47 PM, Alexander Chemeris
<alexander.chemeris at gmail.com> wrote:
> Hi Srdjan,
> We're looking into re-purposing UmTRX for LTE and there a few things which
> we need to understand better.
> 1. Is it possible to support 15MHz and 20MHz LTE channel bandwidths? To
> achieve this we at least need to sample at 23.04Msps and 30.72Msps
> respectively. LMS6002D datasheet specifies the maximum I/Q samplerate of
> 14Msps, which is not enough. But at the same time, datasheet claims that ADC
> and DAC are specified up to 50Msps. How does this fits together?

Can you provide a reference to where the datasheet calls out a max I/Q
sample rate of 14 Msps?  The analog low pass filters support a max
bandwidth of 14 MHz (which leads to 28 MHz RF bandwidth assuming
zero-IF operation)...is this what you're referencing?  We run the A/D
converters in the LMS6002d at sample rates greater than 14 Msps all
the time, including 30.72 Msps.

John Orlando
Epiq Solutions

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