Texas Instruments AFE7222 Evaluation Module AFE7222EVM AFE7222EVM 데이터 시트
제품 코드
AFE7222EVM
Initial EVM Setup and Basic Test Procedure
Figure 3. AFE722x EVM Setup
4.1
CDCE72010 Configuration
The initial EVM setup is configured so that the AFE722x can be operated at any desired sampling rate.
Since the TSW1400 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 3× the AFE sampling rate (that is,
368.64 MHz for 122.88-MHz 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 TSW1400.
Since the TSW1400 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 3× the AFE sampling rate (that is,
368.64 MHz for 122.88-MHz 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 TSW1400.
Figure 4. CDCE72010 Configuration
4.2
RX Path Using TSW1400
First the AFE722x digital interface needs to be configured to match the serial LVDS interface that the
TSW1400 is expecting. The following control registers need to be set in the General Setup tab of the
AFE722x programming software. Also, the USB communication warning sign should be monitored after
the USB reset, to ensure proper communication with the AFE722x EVM.
TSW1400 is expecting. The following control registers need to be set in the General Setup tab of the
AFE722x programming software. Also, the USB communication warning sign should be monitored after
the USB reset, to ensure proper communication with the AFE722x EVM.
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SLOU362 – February 2013
AFE722x Evaluation Module (AFE722xEVM) User's Guide
Copyright © 2013, Texas Instruments Incorporated