Data Sheet

ADL5330

Rev. B | Page 13 of 24

APPLICATIONS INFORMATION

BASIC CONNECTIONS

Figure 32 shows the basic connections for operating the ADL5330.

There are two positive supplies, VPS1 and VPS2, which must be

connected to the same potential. Both COM1 and COM2

(common pins) should be connected to a low impedance

ground plane.

A power supply voltage between 4.75 V and 5.25 V should be

applied to VPS1 and VPS2. Connect decoupling capacitors with

100 pF and 0.1 μF power supplies close to each power supply

pin. The VPS2 pins (Pin 18 through Pin 22) can share a pair of

decoupling capacitors because of their proximity to each other.

The outputs of the ADL5330, OPHI and OPLO, are open collectors

that need to be pulled up to the positive supply with 120 nH RF

chokes. The ac coupling capacitors and the RF chokes are the

principle limitations for operation at low frequencies. For example,

to operate down to 1 MHz, 0.1 μF ac coupling capacitors and

1.5 μH RF chokes should be used. Note that in some circum-

stances, the use of substantially larger inductor values results in

oscillations.

Since the differential outputs are biased to the positive supply,

ac-coupling capacitors, preferably 100 pF, are needed between

the ADL5330 outputs and the next stage in the system. Similarly,

the INHI and INLO input pins are at bias voltages of about

3.3 V above ground.

The nominal input and output impedance looking into each

individual RF input/output pin is 25 Ω. Consequently, the

differential impedance is 50 Ω.

To enable the ADL5330, the ENBL pin must be pulled high.

Taking ENBL low puts the ADL5330 in sleep mode, reducing

current consumption to 250 μA at ambient. The voltage on

ENBL must be greater than 1.7 V to enable the device. When

enabled, the device draws 100 mA at low gain to 215 mA at

maximum gain.

INHI

C13

100pF

C11

100pF

C12

0.1

F

C10

1nF

C9

1nF

INLO

COM1

VPS1

VPS1

COM1

C14

100pF

OPHI

C5

100pF

OPLO

COM2

VPS2

VPS2

COM2

C6

100pF

C7

100pF

C8

0.1

F

C1

0.1

F

C2

100pF

C16

100pF

C12

0.1

F

VPOS

GAIN

RF INPUT

RF OUTPUT

VPOS

VPOS

VPOS

C3

0.1

F

C4

100pF

VPOS

L2

120nH

L1

120nH

ADL5330

Figure 32. Basic Connections