Data Sheet

ADL5726

Rev. A | Page 11 of 13

EVALUATION BOARD

The ADL5726-EVALZ comes with an ADL5726 chip. Itsupports

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

using a 3.3 V or 1.8 V supply, remove the R1 and R2 resistors

from the evaluation board. Figure 25 shows the ADL5726-

EVALZ lab bench setup.

INITIAL SETUP

To set up the ADL5726-EVALZ, take the following steps:

1. Power up the ADL5726-EVALZ with a 5 V dc supply. The

supply current of the evaluation board is approximately

90 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 ADL5726-

EVALZ.

3. Connect RFOP and RFON to a 180° hybrid that works

within the 21.2 GHz to 23.6 GHz frequency range.

4. Connect the difference output of the hybrid to the

spectrum analyzer. The sum port of the hybrid must be

terminated to 50 Ω.

See Figure 25 for the ADL5726-EVALZ lab bench setup.

RESULTS

Figure 24 shows the expected results when testing the

ADL5726-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 ADL5726 product page

for the most recent software version.

Figure 24 shows the results of the differential output for an input

of 21.2 GHz at −15 dBm. The hybrid and board loss have not

been deembedded.

20

10

0

–10

–20

–30

–40

–50

–60

–70

–80

1

21.15

21.17

21.16

21.18 21.19

21.21

21.23

21.20

21.22

21.24 21.25

FREQUENCY (GHz)

RESOLUTION BANDWIDTH = 20kHz

VIDEO BANDWIDTH = 20kHz

SWEEP = 301ms (1001pts)

Figure 24. Test Results at 21.2 GHz

+5V DC

GND

INPUT

RF FREQUENCY GENERATOR

RFON

RFOP

180° HYBRID FOR DIFFERENTIAL

TO SINGLE ENDED OUTPUT

SPECTRUM

ANALYZER

Figure 25. ADL5726-EVALZ Lab Bench Setup