Analog Devices ADRF5048-EVALZ User Manual page 4

User Guide
TEST PROCEDURE
BIASING SEQUENCE
To bias up the ADRF5048-EVALZ, perform the following steps:
1. Ground the GND test point.
2. Bias up the VDD test point.
3. Bias up the VSS test point.
4. Bias up the V1, V2, EN, and LS test points.
5. Apply an RF input signal.
The ADRF5048-EVALZ is shipped fully assembled and tested.
Figure 3 provides a basic test setup diagram to evaluate the
s-parameters using a network analyzer. Perform the following steps
to complete the test setup and to verify the operation of the
ADRF5048-EVALZ:
1. Connect the GND test point to the ground terminal of the power
supply.
2. Connect the VDD test point to the voltage output terminal of the
+3.3 V supply. Note that the current must be 0.15 mA.
3. Connect the VSS test point to the voltage output terminal of the
−3.3 V supply. Note that the current must be 0.52 mA.
4. Connect the V1, V2, EN, and LS test points to the voltage
output terminal of the 3.3 V supply. The
configured in different modes by connecting the control test
points to 3.3 V or 0 V, as shown in
5. Connect a calibrated network analyzer to the RFC, RF1, RF2,
RF3, and RF4 2.92 mm connectors. If network analyzer port
count is not enough, terminate unused RF ports with 50 Ω.
Sweep the frequency from 10 MHz to 45 GHz and set the
power to –5 dBm.
6. The ADRF5048-EVALZ is expected to have an insertion loss of
2.4 dB at 40 GHz. See the expected results in
Additional test equipment is needed to fully evaluate the
ADRF5048-EVALZ functions and performance.
Table 3. Control Voltage Truth Table
Digital Control Inputs
EN LS V1
Low Low Low
Low Low High
Low Low Low
Low Low High
Low High Low
Low High High
Low High Low
Low High High
High Low or high Low or high Low or high Isolation (off)
analog.com
ADRF5048 can be
Table 3.
Figure 4.
V2 RF1 to RFC
Low Insertion loss (on)
Low Isolation (off)
High Isolation (off)
High Isolation (off)
Low Isolation (off)
Low Isolation (off)
High Isolation (off)
High Insertion loss (on)
For third-order intercept point evaluation, use two signal generators
and a spectrum analyzer. A high isolation power combiner is also
recommended.
For power compression and power handling evaluations, use a 2-
channel power meter and a signal generator. A high enough power
amplifier is also recommended at the input. Test accessories, such
as couplers and attenuators, must have enough power handling.
The ADRF5048-EVALZ comes with a support plate attached to
the bottom side. To ensure maximum heat dissipation and to
reduce thermal rise on the ADRF5048-EVALZ during high power
evaluations, this support plate must be attached to a heat sink
using thermal grease.
Note that the measurements performed at the 2.92 mm connectors
of the ADRF5048-EVALZ include the losses of the 2.92 mm con-
nectors and the PCB. The thru line must be measured to calibrate
out the effects on the ADRF5048-EVALZ. The thru line is the
summation of an RF input line and an RF output line that are
connected to the ADRF5048-EVALZ and equal in length.
Figure 3. Test Setup Diagram
RFx Paths
RF2 to RFC RF3 to RFC
Isolation (off) Isolation (off)
Insertion loss (on) Isolation (off)
Isolation (off) Insertion loss (on)
Isolation (off) Isolation (off)
Isolation (off) Isolation (off)
Isolation (off) Insertion loss (on)
Insertion loss (on) Isolation (off)
Isolation (off) Isolation (off)
Isolation (off) Isolation (off)
EVAL-ADRF5048
RF4 to RFC
Isolation (off)
Isolation (off)
Isolation (off)
Insertion loss (on)
Insertion loss (on)
Isolation (off)
Isolation (off)
Isolation (off)
Isolation (off)
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