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Programmable independent channels in GC5330

Hello,

 We are currently evaluating GC5330  as digital down converter , for our application we need to down sample 40 Narrow band channels (decimation rate : 108).

datasheet says GC5330 supports 48 Narrow band channels if we use all 4 DDUC blocks in either DUC or DDC mode  and with each DDUC block having 3 ( Mixer / NCO's).

With the total no of mixers being 12  (in 4 DDUC blocks), is it only support 12 independent channels to  configure with 12 different NCO's ?

In our case IF (intermediate frequency) of 40  narrow band channels are different but with common decimation rate of 108.

IS it possible to use GC5330/GC6016 for our application ..kindly suggest 

  • Hello,

    The GC533x is a Rx/Tx with CFR,DPD transceiver.  The GC6016 is an Rx/Tx device with CFR, but no DPD. 

    These devices are mostly used for wideband basestation applications (ie WCDMA, LTE).  There are no current customers

    that use all 4 DDUCs for Rx applications.  You need to contact your local Texas Instruments Field Application Engineer for DSP, as there are specific business allocations, along with purchasing an EVM which are required to use these devices. 

    The Rx portion utilizes an Rx ADC at 153.6, 184.32, 204.8, or 245.76Msps.  The Rx architecture is a real IF places at near Fs/4 or 3Fs/4.  The Rx block converts the 2 or 4 Rx inputs to complex streams, and has stream independent mixing.  The complex output rate is typically FsADC/4, which contains several sets of DDC channels.  In an application where there are 12 DDC channels per DDUC,  Each DDUC channel has independent tuning, but has a common decimation, and common PFIR filtering (default example).  The CIC decimates by 3, the Resampler converts the downconverted CIC output at (FsADC/12) to the PFIR input rate.  The PFIR can be a FIR with no decimation, or a decimation by 2. 

    The Baseband output is typically 16bit resolution, there are 2 Nibble outptuts (8nibbles per IQ) usually segregated by IQ rate.   The DDR LVDS output is typically received in an FPGA.  The is the technology shown in the GC6016 EVM. 

    Control of the ASIC is done with an L138 DSP, to translate the network control commands into the EMIF-16 register writes. 

    It is important to know t he desired BB IQ rate, and ADC sample rate to determine if the device is capable of your 40 channel DDC function.  Please check with your local

    TI Field Application Engineer, as the use of these parts have business restrictions.

    Regards.

    Radio Joe