ADL5390-EVAL Ver la hoja de datos (PDF) - Analog Devices

Número de pieza

componentes Descripción

Lista de partido

ADL5390-EVAL

RF/IF Vector Multiplier

Analog Devices 

ADL5390

APPLICATIONS

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 out-

put 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 dif-

ferentially 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 termi-

nation pads and the device input pins, which provides series in-

ductance 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

66.5Ω 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

66.5Ω

R22

66.5Ω

IBBP IBBM

C7

C8

C12

0.1µF

100pF (SEE TEXT)

VP

L1

0Ω

C2

10nF

L2

0Ω

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

0.1µF 100pF

C11

(SEE TEXT)

C10

100pF

VP

SW1 B

R8

A

10kΩ

C18

10nF

L4

120nH

C14

0.1µF

C9

0.1µF

C17

L3

10nF

120nH

VP

15

3 T1 4

ETC1-1-13

(M/A-COM)

QBBP QBBM

Figure 29. Basic Connections

RFOP

Rev. 0 | Page 12 of 24

Share Link: