Texas Instruments ADS54J64, Руководство пользователя

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Optimizing Evaluation Results
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10 SBAU290 – September 2017
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ADS54J64 Evaluation Module
3 Optimizing Evaluation Results
This section is meant to assist users in optimizing performance during evaluation of the product.
3.1 ADS54J64 Operating Mode
The ADS54J64 device may operate in eight different modes: Mode 0 through Mode 8 (excluding Mode 5).
Each mode may require a different device selection in HSDC Pro, device configuration script in the
ADS54J64 EVM GUI, and different sampling rate setup in HSDC Pro to operate correctly.
Table 3 shows the HSDC Pro sampling rate setup. The desired mode is selected from the ADS54J64EVM
GUI
→
Mode tab in the configuration GUI.
(1)
The ADC Sampling Rate used in HSDC Pro for Mode 7 depends on the .ini file used. The example shown here applies to
selecting ‘ADS54J64_LMF_4421_mode7’ which strips the buffered 0s from the data stream.
Table 3. HSDC Pro ADC Output Data Rate
ADS54J64 Operating
Mode
ADS54J64 Device
Clock Frequency
HSDC Pro ADC
Sampling Rate
Decimation NCO
Mode 0
983.04 MHz 491.52M 2 –122.88M
737.28 MHz 368.64M 2 –92.16M
Mode 1
983.04 MHz 491.52M 2
Depends on
programmed NCO word
737.28 MHz 368.64M 2
Depends on
programmed NCO word
Mode 2
983.04 MHz 491.52M 2 0
737.28 MHz 368.64M 2 0
Mode 3
983.04 MHz 491.52M 1
Depends on
programmed NCO word
737.28 MHz 368.64M 1
Depends on
programmed NCO word
Mode 4
983.04 MHz 491.52M 2
Depends on
programmed NCO word
737.28 MHz 368.64M 2
Depends on
programmed NCO word
Mode 6 Not yet supported.
Mode 7
(1)
983.04 MHz 491.52M 2
Depends on
programmed NCO word
737.28 MHz 368.64M 2
Depends on
programmed NCO word
Mode 8
983.04 MHz 491.52M 1 0
737.28 MHz 368.64M 1 0
Mode 9
983.04 MHz 983.04M 1 0
737.28 MHz 737.28M 1 0
For operating in a mode other that Mode 0, follow the default start-up procedure, and then perform the
following:
1. From the ADS54J64 Mode tab in the configuration GUI, select the desired mode.
2. When selecting the device in HSDC Pro (), choose the device and enter the ADC Output Data Rate as
reported by the configuration GUI on the ADS54J64 Mode tab.
Based on the sampling rate and mode of operation, adjust ADC Output Rate Additional Device
Parameters to correctly label the harmonics. An example is shown in Figure 4 for Mode 0.