User Guide
EVAL-ADMV8526
PERFORMING EVALUATION
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Rev. 0 | 10 of 17
ADMV8526-EVALZ QUICK START
To set up the ADMV8526-EVALZ, take the following steps:
1.
Connect the RF1 and RF2 ports to a network analyzer (or a
similar instrument). Typically, RF1 and RF2 are connected to
Port 1 and Port 2 on the network analyzer, as shown in
Figure 2
.
2.
Connect the
SDP-S
to the 120-pin connector on the
ADMV8526-EVALZ. Do not connect the SDP-S to the PC until
after completing Step 3 or Step 4.
3.
On the ADMV8526-EVALZ, slide the S1 switch to select USB
(as shown in
Figure 2
) to power the ADMV8526-EVALZ from
the 5 V USB supply voltage from the PC via the SDP-S.
4.
Alternatively to Step 3, slide the S1 switch to select EXT and
connect the power supplies to the VPOS and VNEG ports. The
applicable voltage range for VPOS is b3.5 V and
+5.5 V and for VNEG is between −5.5 V and −2.7 V. The
external supply current limits must be set to 20 mA. Expected
supply current drawn for VPOS is 12 mA to 14 mA and for
VNEG is 2 mA to 3 mA. The
ADMV8526
chip current drawn
per supply pin is typically 10s of microamps or less. Most of
the current drawn from the ADMV8526-EVALZ comes from the
LDO regulators and the status indicator light emitting diodes
(LEDs), DS1 to DS3.
5.
Connect a USB cable between the PC and the SDP-S.
6.
Open the
ACE
software. The
ADMV8526 Board
appears in
the
Attached Hardware
section of the
Start
tab. Double-click
on the
ADMV8526 Board
plug-in to open two tabs, one is the
ADMV8526 Board
plug-in view, and one is the ADMV8526 chip
plug-in view.
7.
Use the
CONFIGURATION
section (see
Figure 11
) in the ACE
software to initialize the chip. By default, the
ADMV8526_Co-
efficients_Bandwidth_Nominal.csv
file is loaded into this sec-
tion. Click
Apply
to send the default settings to the chip and to
allow the main diagram user controls to become editable.
NETWORK ANALYZER SETTINGS
When evaluating the ADMV8526-EVALZ, a good starting point for
configuring the network analyzer is as follows:
►
Start frequency = 0.01 GHz
►
Start frequency = 4.01 GHz
►
Number of points = 4001
►
Step size = 1 MHz
►
Power level = –10 dBm
►
Measure types = S-parameters (S21, S11, and S22)
►
Format = log magnitude (S21), smith charts (S11 and S22)
►
Calibration = full 2-port
CSV FILES
By default, the
ADMV8526_Coefficients_Bandwidth_Nomi-
nal.csv
file is loaded into the
CONFIGURATION
section. This file
contains interpolation coefficients that correspond to approximately
9% bandwidth. There are two additional .csv files provided that
contain interpolation coefficients for approximately 7% and 11%
bandwidth, respectively. To load a different .csv file in the
CONFIG-
URATION
section, take the following steps:
1.
If the
Modify
button is visible, click to allow changes.
2.
Click
Restore Software Defaults
to zero out the
CONFIGURA-
TION
section.
3.
Click the
…
button next to
Load Settings from CSV
to select
which .csv file to load (see
Figure 11
).
4.
Select the
Check to Load Settings
check box to load the .csv
file contents into the
CONFIGURATION
section. Note that a
check mark does not appear when the check box is selected.
5.
Click
Apply
to send out the settings to the hardware.
Figure 11. ADMV8526 CONFIGURATION Section
