Evaluation Board Configuration; Setting Up The Evaluation Board - Analog Devices EVAL-ADN4650EB1Z User Manual

EVAL-ADN4650EB1Z User Guide

EVALUATION BOARD CONFIGURATION

SETTING UP THE EVALUATION BOARD

On the EVAL-ADN4650EB1Z, the power supplies are configured
using Jumpers P4 and P7 (see Table 1) and are connected to the
J9 and J10 SMA connectors (see Table 2 and Table 3). A 3.3 V
power supply can be applied to Side 1 and/or Side 2 of the
ADN4650 by removing Jumpers P4 (Side 1) and P7 (Side 2). If a
2.5 V power supply is connected, insert the relevant jumper
must (P4 for Side 1 and P7 for Side 2). At 300 MHz with a load
resistance of 100 Ω, the maximum operating current from each
power supply is 72 mA.
When using a 3.3 V power supply, V
on the ADN4650) are bypassed to GND
capacitors (C18 and C2, respectively). V
Pin 18 on the ADN4650) are bypassed to GND
1 µF capacitors (C19 and C6, respectively). When using a 2.5 V
power supply, V or V connects directly to V
IN1 IN2
shorting Jumpers P4 or P7, respectively. Both V
bypassed to GND with 0.1 µF capacitors (C1 and C4). Both V
1
pins are also bypassed to GND
Figure 4 shows an example operation of the EVAL-ADN4650EB1Z.
SMA connectors expose all LVDS inputs and outputs (see Table 2
and Table 3). Connect a signal generator using the J1 and J2
connectors and set up a 300 MHz square wave clock with an
amplitude of 350 mV and an offset of 1.2 V. Connect the
oscilloscope directly to the J5 and J6 connectors to perform
timing measurements including propagation delay and skew.
Precision measurements, for example, jitter, using a differential
probe requires attaching the probe at the TP7 and TP8 test
points (or TP9 and TP10 for Isolator Channel 2) and potentially
cutting the traces to the connectors to minimize reflections.
Figure 2 shows a plot of the oscilloscope connected via the J5 and
J6 connectors. Oscilloscope Channel 3 (green) and Channel 4
(purple) show the J5 and J6 connectors separately (single-ended)
with the differential signal (orange).
Figure 3 shows an operation of the second isolated LVDS channel.
In contrast to Figure 2, the signal generator connects via the J3
and J4 connectors and the oscilloscope connects to the J7 and J8
connectors. Oscilloscope Channel 3 (green) and Channel 4
(purple) show the J7 and J8 connectors separately (single-ended)
with the differential signal (orange).
and V (Pin 1 and Pin 3
IN1 DD1
on the board using 1 µF
1
and V (Pin 20 and
IN2 DD2
on the board using
2
or V
DD1 DD2
pins are also
DD1
with 0.1 µF capacitors (C5and C7).
2
Figure 2. D
OUT1−
by
DD2
Figure 3. D
OUT2−
Rev. 0 | Page 3 of 9
and D with a 300 MHz Clock, Single-Ended and Differential
OUT1+
and D with a 300 MHz Clock, Single-Ended and Differential
OUT2+
UG-933