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MAX5868EVKIT Datasheet(PDF) 13 Page - Maxim Integrated Products

Part No. MAX5868EVKIT
Description  Evaluates the MAX5868 RF DAC Performance, Evaluates the MAX5868 RF DAC Performance,
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Maker  MAXIM [Maxim Integrated Products]
Homepage  http://www.maxim-ic.com
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MAX5868EVKIT Datasheet(HTML) 13 Page - Maxim Integrated Products

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Evaluates: MAX5868
MAX5868 Evaluation Kit
A differential source can be connected directly to the
MAX5868 by removing the PLLCLK Module and configuring the
differential traces on the main EV kit board. The method
for reconfiguring the clock input is the following:
1) Remove the mounting screws/backing plate from the
SMA connector on the PLLCLK Module.
2) De-solder and remove the Clock Input Module from
the MAX5868 EV kit.
3) Populate R61 and R62 with 0Ω resistors.
4) Mechanically connect two Rosenberger, edge-launch
SMAs to the MAX5868 EV kit at J7 and J8.
5) Solder the center conductors of J7 and J8 to the
differential traces.
The output module (RFDAC_XFMR_OUT_MODULE)
converts the differential output of the MAX5868 RF DAC
to a single ended 50Ω output suitable for driving the
input of a 50Ω Spectrum Analyzer. The Output Module
can be removed from the MAX5868 EV kit board and a
differential signal path can be substituted. The method for
reconfiguring the DAC output is the following:
1) Remove the mounting screws/backing plate from the
SMA connector on the Output Module.
2) De-solder and remove the Output Module from the
MAX5868EVKIT.
3) Populate C93 and C99 with 0.01μF capacitors.
4) Mechanically connect two Rosenberger, edge-launch
SMAs to the MAX5868 EV kit at J2 and J6.
5) Solder the center conductors of J2 and J6 to the
differential traces.
Power
The MAX5868 EV kit board requires a single +3.3V,
3A power supply connected to the board through two
“banana” jacks (marked +3.3V and GND) or a set of
wire loops that can be used with EZ-Hooks (also marked
+3.3V and GND).
The +3.3V supply is used by the various support circuits
including two MAX8527 linear regulators (LDOs) which
provide the 1.8V supply rails for the MAX5868 and
various support circuitry plus a MAX8556 LDO which
supplies the 1.0V level to the MAX5868. One LDO is used
for each supply rail, however the LDO outputs are isolated
between analog and digital domains by on board filter
networks. The PLL supplies for the MAX5868 are isolated
from the analog domain through additional filtering.
Figure 11. MAX5868 Differential Clock Input
Figure 12. MAX5868 RFDAC Output – 12a.Transformer Output Module and, 12b. Differential DAC Output
12a.
12b.


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