Data Sheet ADL5721
Rev. 0 | Page 13 of 15
EVALUATION BOARD
The ADL5721-EVALZ comes with an ADL5721 chip. It supports
a single 5 V supply for ease of use. For 5 V operation, the 3.3 V
and 1.8 V test loops are for evaluation purposes only. When the
3.3 V and 1.8 V supply is used, remove the R1 and R2 resistors
from the evaluation board. Figure 34 shows a picture of the
ADL5721-EVALZ lab bench setup.
The band switch feature allows the input P1dB and noise figure
to trade off for optimum system performance. For the lower
frequency band (BAND = 0 V), short Pin 1 and Pin 2 of the
P1 connector. For the higher frequency band (BAND = 1.8 V),
open Pin 1 and Pin 2 of the P1 connector to obtain better
system performance.
INITIAL SETUP
To set up t he ADL5721-EVALZ, take the following steps:
1. Power up the ADL5721-EVALZ with a 5 V dc supply. The
supply current of the evaluation board is approximately
88 mA, which is a combination of the VCC1 (1.8 V) and
the VCC2 (3.3 V) currents.
2. Connect the signal generator to the input of the ADL5721-
EVALZ.
3. Connect RFOP and RFON to a 180° hybrid that can work
within the 5.9 GHz to 8.5 GHz frequency range.
4. Connect the difference output of the hybrid to the spectrum
analyzer. Terminate the sum port of the hybrid to 50 Ω.
See Figure 34 for the ADL5721-EVALZ lab bench setup.
RESULTS
Figure 32 and Figure 33 show the expected results when testing
the ADL5721-EVALZ using the Rev. A version of the evaluation
board and its software. Note that future iterations of the software
may produce different results. See the ADL5721 product page
for the most recent software version.
Figure 32 shows the results of the differential output for an input
of 7.2 GHz at −15 dBm with a BAND = 0 V, with Pin 1 and Pin 2
of the P1 connector shorted. The hybrid and board loss were
not deembedded.
POWER OUTPUT (dBm)
20
10
0
–10
–20
–30
–40
–50
–60
–70
–80
7.15 7.177.16 7.18 7.19 7.21 7.237.20 7.22 7.24 7.25
FREQUENCY (GHz)
2
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RESOLUTION BANDWIDTH = 20kHz
VIDEO BANDWIDTH = 20kHz
SWEEP = 301ms (1001pts)
Figure 32. Results of the ADL5721 with an Input of 7.2 GHz at −15 dBm,
BAND = 0 V
Figure 33 shows the results of the differential output for an
input of 8.5 GHz at −15 dBm with a BAND = 1.8 V, with Pin 1
and Pin 2 of the P1 connector open. The hybrid and board loss
were not deembedded.
20
10
0
–10
–20
–30
–40
–50
–60
–70
–80
2
POWER OUTPUT (dBm)
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8.45 8.478.46 8.48 8.49 8.51 8.538.50 8.52 8.54 8.55
FREQUENCY (GHz)
RESOLUTION BANDWIDTH = 20kHz
VIDEO BANDWIDTH = 20kHz
SWEEP = 301ms (1001pts)
Figure 33. Results of the ADL5721 with an Input of 8.5 GHz at −15 dBm,
BAND = 1.8 V
+5V DC GND
BAND
INPUT
180° HYBRID FOR DIFFERENTIAL
TO SINGLE-ENDED OUTPUT
RF FREQUENCY GENERATOR
RFOP
SPECTRUM
ANALYZER
RFON
14258-035
Figure 34. ADL5721-EVALZ Lab Bench Setup
