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MAX5868EVKIT Datasheet(PDF) 12 Page - Maxim Integrated Products

Part No. MAX5868EVKIT
Description  Evaluates the MAX5868 RF DAC Performance, Evaluates the MAX5868 RF DAC Performance,
Download  55 Pages
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Maker  MAXIM [Maxim Integrated Products]
Homepage  http://www.maxim-ic.com
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MAX5868EVKIT Datasheet(HTML) 12 Page - Maxim Integrated Products

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Evaluates: MAX5868
MAX5868 Evaluation Kit
Control Interface
The MAX5868 EV kit board provides two forms of
communication and control interfacing to the RF DAC and
the temperature monitor: a pass-through from the FPGA
system and an on-board USB Interface. The FPGA pass-
through provides a Serial Port Interface (SPI) to control
the MAX5868 RF DAC, and a SMBus interface to control
the MAX6654 (temperature monitor). The on-board USB
interface uses an FTDI4232 device which provides the
SPI and I2C bus signals, as well as GPIO controls for
the hardwired MUTE, INTB, and RESETB signals on the
MAX5868. The FPGA pass-through and the on-board
FTDI interface are selected with jumpers J4 and J10
which in-turn use CMOS switches and level translators to
route the incoming control signals as needed.
The default settings of J4 and J10 are for using the FPGA
pass-through interface. To use the on-board FTDI, switch
the J4 and J10 jumpers, as shown in Figure 9b.
Interface Modules
The MAX5868 EV kit employs two modules to allow for easy
interfacing to Signal Generators and Spectrum Analyzers.
The Clock Input Module (MAXPLLCLKMODULE)
integrates a MAX2871 23.5MHz to 6000MHz Fractional/
Integer-N Synthesizer/VCO that drives the CLKP/CLKN
inputs of the MAX5868. The module employs a 50MHz
reference crystal for the integrated PLL of the MAX2871.
Alternatively, the user can supply an external reference
after proper configuration of the module. The modifications
required for using an external reference are:
1) Remove R1, 0Ω resistor,
2) Install R2, 50Ω resistor,
3) Install C1, 0.01µF capacitor,
4) Connect external source, between 10MHz and
210MHz at roughly 1VP-P.
Figure 10. PLLCLK Module
Figure 9. MAX5868EVKIT Jumpers. 9a – Default FPGA Pass-Through Interface; 9b – On-Board FTDI Interface
9a.
9b.


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