Data Sheet

ADL5605

Rev. B | Page 13 of 18

APPLICATIONS INFORMATION

BASIC LAYOUT CONNECTIONS

The basic connections for operating the ADL5605 are shown

in Figure 32. The RF matching components correspond to the

943 MHz frequency tuning band.

Power Supply

The voltage supply for the ADL5605, which ranges from 4.75 V

to 5.25 V, should be connected to the VCC1 test pin. The dc bias

to the output stage is supplied through L1 and is connected to the

RFOUT pin. Three decoupling capacitors (C7, C8, and C9) are

used to prevent RF signals from propagating on the dc lines. The

VBIAS and VCC pins can be directly connected to the main

supply voltage. Additional decoupling capacitors (C5, C6, C11,

C12, C13, and C14) are required on the VCC and VBIAS pins.

RF Input Interface

Pin 1 is the RF input pin for the ADL5605. The RF input is easily

matched to 50 Ω with only one shunt capacitor and the micro-

strip line used as an inductor. For the 881 MHz and 943 MHz

frequency tuning bands, the input requires no external matching

components.

For complete information about component values and spacing

for the different frequency tuning bands, see the ADL5605

Matching section.

RF Output Interface

Pin 9 to Pin 12 are the RF output pins. Inductor L2, the shunt

used to match the RF output to 50 Ω. For complete information

about component values and spacing for the different frequency

tuning bands, see the ADL5605 Matching section.

Power-Down

The ADL5605 can be disabled by connecting the DISABLE pin

to 5 V. When disabled, the ADL5605 draws approximately 5 mA

of current from the power supply and 1.4 mA from the DISABLE

pin. Decoupling Capacitor C3 is recommended to prevent the

propagation of RF signals. To completely shut down the device,

connect the VCC pin, the VBIAS pin, and the VCC1 test pin to

ground. In this state, the part draws approximately 1.4 mA from

the DISABLE pin.

RFIN

VCC

VBIAS

DISABLE

RFOUT

12

VBIAS

11

VCC

10

DISABLE

9

RFIN

1

2

3

4

ADL5605

VCC1

8pF

C2

100pF

C1

100pF

C3

10pF

C5

100pF

C7

100pF

C8

0.01µF

C9

10µF

RFOUT

RFOUT

RFOUT

RFOUT

13

8

14

7

15

6

16

5

NC

NC

NC

NC

NC

NC

NC

NC

C6

0.01µF

C11

10µF

C12

100pF

C13

0.01µF

C14

10µF

L1

18nH

L2

1.6nH

Figure 32. Basic Connections