Analog Devices ADRF5519-EVALZ, User Manual

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User Guide UG-1948
TEST PROCEDURE
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BIASING SEQUENCE
To bias up the ADRF5519-EVALZ, perform the following steps:
1. Ground the GND or GND1 test point.
2. Bias up VDD1_A, VDD2_A, and SWVDDB test points.
3. Bias up the SWCTRL test point.
4. Bias up the PD test point.
5. Bias up the BP_A and BP_B test points.
6. Apply an RF input signal.
The ADRF5519-EVALZ is shipped fully assembled and tested.
Figure 3 provides a basic test setup diagram to evaluate the
s-parameters (receive gain, transmit insertion loss and isolation, RF
input and output return losses) using a network analyzer. Perform
the following steps to complete the test setup and verify the opera-
tion of the ADRF5519-EVALZ:
1. Connect the GND or GND1 test point to the ground terminal of
the power supply.
2. Connect the VDD1_A, VDD2_A, and SWVDDB test points to
the voltage output terminal of the 5 V supply that sources a
current of approximately 220 mA in receive operation for high
gain mode or 24 mA for power-down mode.
3. Connect the BP_A, BP_B, PD, and SWCTRL test points to
the ground terminal of the power supply for high gain receive
operation. The ADRF5519 can be configured in different modes
by connecting the control test points to 5 V or ground, as shown
in Table 5 and Table 6 .
4. Connect a calibrated network analyzer to the ANT_A, TERM_A,
and RXO_A SMA connectors. Sweep frequency from 1 GHz to
6 GHz and set power to −25 dBm.
5. Connect 50 Ω loads to the ANT_B, TERM_B, and RXO_B SMA
connectors.
6. The ADRF5519-EVALZ is expected to have a high and low
receive gain of 35 dB and 14 dB, respectively, at 2.6 GHz. See
the expected results in Figure 4 to Figure 7 .
Table 5. Truth Table Switch Control
SWCTRL
Signal Path
Low Receive Operation
High Transmit Operation
Table 6. Truth Table Receive Operation
PD
BP_A, BP_B Receive Operation
Low Low High Gain Mode
Low High Low Gain Mode
High Low Power-Down, High Isolation Mode
High High Power-Down, Low Isolation Mode
Additional test equipment is needed to fully evaluate the device
functions and performance.
For noise figure evaluation, use either a noise figure analyzer or a
spectrum analyzer with noise option. The use of a low excess noise
ratio (ENR) noise source is recommended.
For third-order intercept point evaluation, use two signal generators
and a spectrum analyzer. A high isolation power combiner is recom-
mended.
For power compression and power handling evaluations, use a
two-channel power meter and a signal generator. A high enough
power amplifier is recommended at the input. Test accessories such
as couplers and attenuators must have enough power handling.
The ADRF5519-EVALZ comes with a support plate attached to
the bottom side. To ensure maximum heat dissipation and to
reduce thermal rise on the ADRF5519-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 SMA connectors of
the ADRF5519-EVALZ include the losses of the SMA connectors
and the PCB. The thru line must be measured to calibrate out the
ADRF5519-EVALZ effects. The thru line is the summation of an RF
input line and an RF output line that are connected to the device
and equal in length.
Figure 3. Test Setup Diagram