Data Sheet ADL5605
Rev. A | Page 13 of 20
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
capacitor, C
OUT
, and the inductance from the microstrip line are
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
C
OUT
8pF
C2
100pF
C1
100pF
C3
10pF
C5
100pF
C7
100pF
C8
0.01µF
C9
10µF
RFOUT
RFOUT
RFOUT
RFOUT
09353-031
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
