AD9513/PCB, AD9514/PCB, AD9515/PCB
Rev. 0 | Page 4 of 8
CONFIGURING THE BOARD
INPUTS
Clock Input
The input clock is configured to receive a single-ended signal
from bench hardware and convert it to a differential signal at
the part. This is done by a balun, terminated with a 50 Ω
resistor, followed by coupling capacitors on both the true and
complimentary inputs of the part.
SYNCB Circuit
The SYNCB input allows a sync pulse to be produced without
requiring external circuitry. The evaluation board is populated
with both a momentary switch and an SMA connector labeled
SYNCB. To create a SYNCB signal, depress the momentary switch.
To release the SYNCB signal, release the momentary switch.
An external SYNCB signal can also be applied to the evaluation
board through a cable connected to the SMA connector labeled
SYNCB.
OUTPUTS
AD9513
The AD9513 has three LVDS/CMOS outputs. These outputs are
all terminated with a 100 Ω resistor on the evaluation board
with the assumption that LVDS is selected. To use CMOS
outputs, this 100 Ω resistor should be removed.
AD9514
The AD9514 has two LVPECL output and one LVDS/CMOS
outputs. OUT0 and OUT1 are both LVPECL. Each LVPECL
output is terminated with a 200 Ω resistor to ground, followed
by an ac coupling capacitor. There are pads for an alternate
termination scheme on the evaluation board. This alternate
scheme creates a Thevenin equivalent 50 Ω termination to
V
S
− 2 V. This scheme is utilized by removing the 200 Ω
resistors to ground, replacing the ac coupling cap with a 0 Ω
resistor and adding the appropriate termination resistors. These
resistors attach to the pads located near the SMA connectors.
The LVDS/CMOS output (OUT2) is terminated with a 100 Ω
resistor on the evaluation board with the assumption that LVDS
is selected. To use CMOS outputs, this 100 Ω resistor should be
removed.
AD9515
The AD9515 has the same default termination scheme and
options as the AD9514. The only difference is that the AD9515
has only one LVPECL output, and one LVDS/CMOS output.
