Evaluation Board User Guide UG-125
Rev. 0 | Page 3 of 8
EVALUATION BOARD HARDWARE
RECOMMENDED BOARD SETUP
The recommended setup for the ADCLK944 evaluation board
is shown in Figure 2. V
CC
is set to 2.5 V to 3.3 V, and V
EE
is
set to GND.
On the evaluation board, the clock input is set up for single-
ended-to-differential operation via the balun. In addition, series
capacitors in the path provide ac-coupled inputs to the ADCLK944.
The common-mode voltage for both inputs is provided by tying
V
REF
and V
T
together. This connection is made with R13 installed
at the factory.
The range of the peak-to-peak input voltage swing at CLK is
0.2 V p-p to 1.7 V p-p. Note that output jitter performance is
degraded by an input slew rate, as shown in the ADCLK944
data sheet.
Table 1. Basic Equipment Required
Quantity Description
1 Single power supply
1 Signal source
1 High bandwidth oscilloscope
4 Matched high speed cables
CLOCK
SOURCE
ADCLK944
EVALUATION
BOARD
POWER SUPPLY
OSCILLOSCOPE
+3.3V GND
Qx
Qx
GND
V
REF
V
T
V
EE
V
CC
CLK
CLK
CH 1
CH 2
08976-002
Figure 2. Recommended Setup for Device Evaluation
