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ADL5390-EVALZ
(Rev.:RevA)

RF/IF Vector Multiplier

Analog Devices 

ADL5390

Data Sheet

APPLICATIONS INFORMATION

USING THE ADL5390

The ADL5390 is designed to operate in a 50 Ω impedance system.

Figure 29 illustrates an example where the RF/IF inputs are

driven in a single-ended fashion, while the differential RF

output is converted to a single-ended output with a RF balun.

The baseband gain controls for the I and Q channels are

typically driven from differential DAC outputs. The power

supplies, VPRF and VPS2, should be bypassed appropriately

with 0.1 μF and 100 pF capacitors. Low inductance grounding

of the CMOP and CMRF common pins is essential to prevent

unintentional peaking of the gain. The exposed paddle on the

underside of the package should be soldered to a low thermal

and electrical impedance ground plane.

RF INPUT AND MATCHING

The RF/IF inputs present 250 Ω resistive terminations to

ground. In general, the input signals should be ac-coupled

through dc-blocking capacitors. The inputs may be driven

differentially or single-ended, in which case the unused inputs

are connected to common via the dc-blocking capacitors. The

ADL5390’s performance is not degraded by driving these inputs

single-ended. The input impedance can be reduced by placing

external shunt termination resistors to common on the source

side of the dc-blocking capacitors so that the quiescent dc-bias

level of the ADL5390 inputs is not affected, as shown in Figure 29.

Capacitive reactance at the RF inputs can be compensated for

with series inductance. In fact, the customer evaluation board

has high impedance line traces between the shunt termination

pads and the device input pins, which provides series inductance

and improves the return loss at 1.9 GHz to better than −15 dB

with the shunt termination removed, as shown in Figure 28.

0

–5

S11 MATCH WITHOUT

66.5 TERMINATION

–10

–15

–20

–25

S11 MATCH WITH

TERMINATION

–30

–35

FREQUENCY (MHz)

Figure 28. ADL5390 Customer Evaluation Board RF Input Return Loss.

RFIN_I

RFIN_Q

R2

66.5

R22

66.5

IBBP IBBM

C7

C8

C12

0.1F

100pF (SEE TEXT)

VP

L1

0

C2

10nF

L2

0

C5

10nF

VPRF

CMRF

C1

10nF

C6

10nF

INPI

INMI

IPMQ

INPQ

CMRF

VPRF

ADL5390

DSOP

CMOP

CMOP

RFOM

RFOP

CMOP

CMOP

VPS2

VP

C4

C3

0.1F 100pF

C11

(SEE TEXT)

C10

100pF

VP

SW1 B

R8

A

10k

C18

10nF

L4

120nH

C14

0.1F

C9

0.1F

C17

L3

10nF

120nH

VP

QBBP QBBM

Figure 29. Basic Connections

15

3 T1 4

ETC1-1-13

(M/A-COM)

RFOP

Rev. A | Page 12 of 23

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