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NB4N507ADEVB
b.. For external clock reference use, short the open
trace at Pin 1 and provide an external clock
reference from a signal generator
(10 ? 27 MHz) into the X1/CLK pin. Terminate
the signal generator with 50 W to SMA ground.
3. Set the programmable S0 and S1 pin switches
accordingly to achieve the desired function table
logic input levels.
4. Set the OE pin to a logic HIGH
5.
a.. If a single power supply is used, connect the
CLKOUT outputs to the oscilloscope with
matched high ? impedance probe cables.
b.. If a split power supply is used, connect the
CLKOUT outputs to the oscilloscope with
matched cables.
6. Ensure the oscilloscope is triggered properly.
Trigger the oscilloscope from the CLKOUT
output.
NB4N507A EVALUATION BOARD PIN DESCRIPTIONS AND FEATURES BY PIN
The NB4N507A Evaluation Board was designed to
accommodate the test and evaluation of the NB4N507A
PECL Clock Synthesizer. Detailed board features by device
pin are described below:
Crystal (X1/CLK and X2)
A through ? hole or surface mount crystal can be used. The
metal traces at the crystal pins are intentionally open for
crystal use and will have no impedance affect on the crystal
pins.
X1/CLK ? External Clock
An SMA connector is provided for X1/CLK if an external
clock source is used on Pin 1. The metal trace at the package
pin is intentionally open for crystal use, but, must be shorted
for a connection to Pin 1 for external clock use. The unused
component pad labeled C2 (used for the crystal load
capacitor) may be used for a 50 W resistor to ground to
terminate an external signal generator.
S0 and S1
The S0 and S1 multiplier select pins can be exercised
manually with the S0 and S1 slide switches when the
jumpers are used across JMP2 and JMP5, or they can be
The H position of the DIP switch asserts a logic HIGH
(V CC ) on the assigned pin and the L asserts a logic LOW
(DUTGND). The S0 and S1 device pins have internal
pull ? up and pulldown resistors. When left open, the S0 or S1
switch “floats” to mid ? logic level. In the M position, the
slide switch is an open and the pin “floats” to the mid ? logic
level.
CLKOUT and CLKOUT
The CLKOUT and CLKOUT PECL outputs have equal
length, 50 W board traces with SMA connectors. Matched
cables can connect to an oscilloscope or frequency counter.
The (LV)PECL CLKOUT outputs have nonstandard,
open collector outputs and must be externally DC loaded and
terminated.
Thevenin equivalent load and termination resistors are
provided on board at the output’s SMA connector.
OE
The Output Enable function can be exercised manually
with the OE switch when the JMP4 jumper is used, or they
can be controlled externally via the SMA connector and the
jumper open .
controlled externally via the SMA connectors with the
jumpers open.
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