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Optimizing Evaluation Results
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.
ADS54J64 Operating
Mode
Mode 0
Mode 1
Mode 2
Mode 3
Mode 4
Mode 6
(1)
Mode 7
Mode 8
Mode 9
(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.
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
10
ADS54J64 Evaluation Module
Table 3. HSDC Pro ADC Output Data Rate
ADS54J64 Device
HSDC Pro ADC
Clock Frequency
Sampling Rate
983.04 MHz
737.28 MHz
983.04 MHz
737.28 MHz
983.04 MHz
737.28 MHz
983.04 MHz
737.28 MHz
983.04 MHz
737.28 MHz
983.04 MHz
737.28 MHz
983.04 MHz
737.28 MHz
983.04 MHz
737.28 MHz
Copyright © 2017, Texas Instruments Incorporated
Decimation
491.52M
2
368.64M
2
491.52M
2
368.64M
2
491.52M
2
368.64M
2
491.52M
1
368.64M
1
491.52M
2
368.64M
2
Not yet supported.
491.52M
2
368.64M
2
491.52M
1
368.64M
1
983.04M
1
737.28M
1
Figure 4
www.ti.com
NCO
–122.88M
–92.16M
Depends on
programmed NCO word
Depends on
programmed NCO word
0
0
Depends on
programmed NCO word
Depends on
programmed NCO word
Depends on
programmed NCO word
Depends on
programmed NCO word
Depends on
programmed NCO word
Depends on
programmed NCO word
0
0
0
0
for Mode 0.
SBAU290 – September 2017
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