Analog Devices ADP2120 Evaluation Board ADP2120-EVALZ ADP2120-EVALZ Fiche De Données
Codes de produits
ADP2120-EVALZ
UG-188
Evaluation Board User Guide
Rev. 0 | Page 4 of 8
scope to an ac coupling, 10 mV/division, 2 μs/division time base
and 20 MHz bandwidth.
and 20 MHz bandwidth.
A standard oscilloscope probe has a long wire ground clip. For
high frequency measurements, this ground clip picks up high
frequency noise and injects it into the measured output ripple.
Figure 3 shows an easy way to measure the output ripple prop-
erly. It requires removing the oscilloscope probe sheath and
wrapping a nonshielded wire around the oscilloscope probe.
By keeping the ground lengths of the oscilloscope probe as
short as possible, true ripple can be measured.
high frequency measurements, this ground clip picks up high
frequency noise and injects it into the measured output ripple.
Figure 3 shows an easy way to measure the output ripple prop-
erly. It requires removing the oscilloscope probe sheath and
wrapping a nonshielded wire around the oscilloscope probe.
By keeping the ground lengths of the oscilloscope probe as
short as possible, true ripple can be measured.
Output Voltage Change
The ADP2119/ADP2120 evaluation board output is preset to
1.2 V; however, the output voltage can be adjusted using the
following equation:
1.2 V; however, the output voltage can be adjusted using the
following equation:
⎟
⎠
⎞
⎜
⎝
⎛
+
×
=
4
3
4
V
6
.
0
R
R
R
V
OUT
09314
-0
03
Figure 3. Output Ripple Measurement