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NB4L339MNGEVB
Table 3. Detailed board features by device pin.
Pin
11, 12, 13, 14, 17, 18,
19, 20, 27, 28, 29, 30
9, 16, 25, 32
2, 4, 5, 7
3, 6
10, 31, 15, 26
??
Name
Qxn, Qxn
V CC
CLKx, CLKx
VTA, VTB
CLKSEL, DIVSEL,
EN, MR
EP
Feature
All of the Qxn & Qxn LVPECL outputs have equal length 50 W impedance board
traces with SMA connectors. Matched cables can connect to an oscilloscope or fre-
quency counter.
The V CC pins are all connected directly to the V CC power plane. Bypass capacitors
are installed at each pin.
The CLKx & CLKx Clock input pins have equal length board traces with SMA con-
nectors. Matched cables can connect to a signal generator.
Resistors R1 ? R4 are intended to terminate a signal generator with 50 W to ground, if
needed. They have been (should be) removed since the NB4L339 already provides
internal 50 W termination resistors for a signal generator when VTx is connected to
SMAGND in a split ? power supply configuration.
The VTA and VTB pins each have a trace from package pin to a node where it can
be connected to either V CC , V EE or SMAGND, depending on the user ’s need.
Slide Switch Control
The board incorporates slide switches to manually control the logic levels for the
CLKSEL, DIVSEL, EN and MR control pins, thus, minimizing cabling. In order to use
the slide switches, the jumpers/shunts on the bottom side of the board must be in-
stalled.
External Control
The CLKSEL, DIVSEL, EN and MR control pins can be controlled from an external
source via the appropriate SMA connector. A 50 W resistor is installed from the trace
to SMAGND to terminate a signal generator, if needed. When using an external
source, remove the switch jumper/shunt from the bottom of the board.
The exposed pad of the QFN ? 32 package is connected to V EE .
2. NOTE. x = A, B, C, or D; n = 0 or 1
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