SLOU330 Datasheet, PDF (4/18 Pages) Texas Instruments – EVM Description

Initial EVM Setup and Basic Test Procedure
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4 Initial EVM Setup and Basic Test Procedure
The fastest way to get the AFE722x EVM up and running is to follow this operating procedure:
• Two signal generators should be connected to the clock and data input of the EVM - preferably with
band pass filter and 10MHz reference locked for coherency.
• Clock input should be connected to ‘CDC AUX IN’ input for AUX clock setup and the clock generator
amplitude should be set to ~10-13dBm.
• TSW1200 (RX) capture card should be plugged in AFE722x EVM and connected to the PC via USB.
• TSW3100 (TX) pattern generation card plugged into AFE722x EVM and connected to PC via Ethernet
cable.
• All appropriate power supplies should be connected – blue LED (D2) on AFE722x EVM indicating
power good status.
• After performing USB reset in AFE722x EVM software, the flashing USB warning sign should
disappear indicating successful USB communication.
4.1 CDCE72010 Configuration
The initial EVM setup is configured so that the AFE722x can be operated at any desired sampling rate.
Since the TSW3100 requires an external clock at ¾ of the AFE clock rate (see clocking section) the
external clock applied to the ‘CDC AUX IN’ connector needs to be 3x the AFE sampling rate (e.g.
368.64MHz for 122.88MHz operation). Loading a preconfigured register file (‘AUX IN - div3 AFE div4
TSW.txt’) to the CDCE72010, it then sets the dividers so that a /3 copy of the input clock is routed to the
AFE722x clock input and a /4 copy to the TSW3100.
CDCE72010
368.64MHz
CDC
AUX IN
122.88MHz
/3
AFE722x
92.16MHz
/4
TSW3100
4
EVM Description
Copyright © 2011, Texas Instruments Incorporated
SLOU330 – December 2011
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