EVAL-ADN4650EB1Z User Guide UG-933
Rev. 0 | Page 3 of 9
EVALUATION BOARD CONFIGURATION
SETTING UP THE EVALUATION BOARD
On the E VA L-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
IN1
and V
DD1
(Pin 1 and Pin 3
on the ADN4650) are bypassed to GND
1
on the board using 1 µF
capacitors (C18 and C2, respectively). V
IN2
and V
DD2
(Pin 20 and
Pin 18 on the ADN4650) are bypassed to GND
2
on the board using
1 µF capacitors (C19 and C6, respectively). When using a 2.5 V
power supply, V
IN1
or V
IN2
connects directly to V
DD1
or V
DD2
by
shorting Jumpers P4 or P7, respectively. Both V
DD1
pins are also
bypassed to GND
1
with 0.1 µF capacitors (C1 and C4). Both V
DD2
pins are also bypassed to GND
2
with 0.1 µF capacitors (C5and C7).
Figure 4 shows an example operation of the E VA L -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).
Figure 2. D
OUT1−
and D
OUT1+
with a 300 MHz Clock, Single-Ended and Differential
Figure 3. D
OUT2−
and D
OUT2+
with a 300 MHz Clock, Single-Ended and Differential
