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MAX5855 Datasheet(PDF) 49 Page - Maxim Integrated Products

Part No. MAX5855
Description  16-Bit, 4.9Gsps Wideband Interpolating and Modulating RF DAC with JESD204B Interface
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Maker  MAXIM [Maxim Integrated Products]
Homepage  http://www.maxim-ic.com
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MAX5855 Datasheet(HTML) 49 Page - Maxim Integrated Products

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Configuration Script Tool
As noted in other sections of this document, proper sequential configuration of the MAX5855 DAC is essential to
operating the device as intended. To assist the user with this configuration process, a PERL script tool has been
developed which takes ten input parameters and provides an output file containing a sequence of commands that can be
written to the device in order to program it for these user-defined operating conditions.
The user provides the input parameters through a text file (with a .txt extension) and the script will generate a sequence
of SPI commands and stores them in an output text file (with a .cfg extension). The configuration parameters and the
acceptable options used to create the input text file are listed in Table 6.
Table 6. Configuration Input Parameters
ITEM PARAMETER
OPTIONS
COMMENTS
EXAMPLE
1
DAC Rate
4915
Value in Msps, must be used as given in the options column
4915
2
CLKPN
Rate
983, 491, 245
CLKP/CLKN clock rate in MHz
Device Clock = 1
491
3
INTP Ratio
4
Interpolation Ratio, set to 4
4
4
Lane Count
5
Number of JESD204B lanes to be used
5
5
Subclass
0
JESD204B Subclass selection
0
6
Device Clock
1
JESD204B Frame sample clock derived from...
CLKP/CLKN
1
7
SYSREF Mode
0
SYSREF mode, set to 0
0
8
NCO Frequency
0, 1, ..., 2948, 2949
fNCO in MHz, value between DC and the DAC Rate divided by 2
1000
9
RCLK Div
1, 2, 4
Sample-Rate-to-RCLK ratio
1
10
ScrambleDis
0
JESD204B lane scrambler
enabled
0
1
disabled
Example input file example_config.txt, contains the below parameter settings:
DAC Rate
= 4915
CLKPN Rate = 491
INTP Ratio = 4
Lane Count = 5
Subclass
= 0
Device Clock = 1
SYSREF Mode = 0
NCO Freq
= 1000
RCLK Div
= 1
ScrambleDis = 0
To execute the PERL script command line type the following:
perl gen_MAX585x_config.pl example_config.txt
Checking setup ...
Creating example_config.cfg file for following setup:
DAC update Rate ..... 4915MHz
CLKPN Input Rate .... 491MHz
DSP INTP Ratio ...... 4
MAX5855
16-Bit, 4.9Gsps Wideband Interpolating
and Modulating RF DAC with JESD204B Interface
www.maximintegrated.com
Maxim Integrated | 49


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