Data Sheet

ADL5506

EVALUATION BOARD

analog.com

Rev. C | 21 of 22

Figure 51 shows the schematic of the ADL5506 evaluation board.

The board is powered by a single supply in the 2.5 V to 5.5 V

range. The power supply is decoupled by 100 pF and 0.1 µF

capacitors. Enable the device by switching SW1 to the on position.

The RF input has a broadband match of 50 Ω using a single 52.3

Ω resistor at R7. More precise matching at spot frequencies is

possible (see the Input Coupling Options section).

Table 6 details the various configuration options of the evaluation

board. Figure 52 shows the layout of the evaluation board.

LAND PATTERN AND SOLDERING

INFORMATION

Pad diameters of 0.20 mm are recommended with a solder mask

opening of 0.30 mm. For the RF input trace, a trace width of 0.30

mm is used, which corresponds to a 50 Ω characteristic impedance

for the dielectric material being used (FR4). All traces going to the

pads are tapered down to 0.15 mm. For the RFIN line, the length of

the tapered section is 0.20 mm.

Figure 51. Evaluation Board Schematic

Figure 52. Layout of Evaluation Board, Component Side

Table 6. Evaluation Board Configuration Options

Component

Description

Default Condition

VPOS, GND

Ground and supply vector pins.

Not applicable

C1, C2, C5, C6, C7,

C8, C9

Power supply decoupling. Nominal supply decoupling of 0.1 µF and 100 pF.

C1, C6 = 100 pF (Size 0402), C2, C5,

C9 = 0.1 µF (Size 0402), C7 = C8 =

open (Size 0805)

R7

RF input interface. The 52.3 Ω resistor at R7 combines with the ADL5506 internal input impedance to give

a broadband input impedance of around 50 Ω.

R7 = 52.3 Ω (Size 0402)

C3, C4, R2, R3

Output filtering. The combination of the internal 100 Ω output resistance and C4 produce a low-pass filter

to reduce the output ripple of the VLOG output. The output can be scaled down using the resistor divider

pads, R2 and R3.

R3 = 0 Ω (Size 0402), R2 = open (Size

0402), C3, C4 = open (Size 0402)

SW1, R4, R10, P2

Device enable. When SW1 is set to the on position, the ENBL pin is connected to the supply and the

ADL5506 is in enable mode. When SW1 I set to the off position, the ENBL pin is grounded (through the 0

Ω resistor), putting the device in power-down mode.

R4 = 0 Ω (Size 0402), R10 = open

(Size 0402), SW1= on position, P2 = not

installed

P1, R1, R5, R6, R8,

R9

Alternate interface. The end connector, P1, allows access to various ADL5506 signals. These signal paths

are only used during factory test and characterization.

P1 = not installed, R1, R5, R6, R9 =

open (Size 0402), R8 = open (Size 0805)