Data Sheet

ADL5523

Rev. B | Page 17 of 24

EVALUATION BOARD

Figure 54 shows the schematic of the ADL5523 evaluation board.

The board is powered by a single supply, and dc bias can be

applied to the board through clip-on leads at VPOS and GND

or through a 2-pin connector, W1.

The evaluation board comes optimized at 1950 MHz from the

factory, but it can be easily modified to work at any frequency

between 400 MHz and 4 GHz. Table 7 lists the recommended

components at various frequencies.

1 VBIAS

2 RFIN

3 NC

4 NC

7

RFOUT

8

VPOS

6

NC

5

NC

ADL5523

Z1

RFIN

RFOUT

C2

0Ω

C1

L1

TR2

TR1

L2

C3

C4

DNP

C5

100nF

W1

VPOS

GND

R1

R2

Figure 54. Evaluation Board Schematic

Figure 55. Evaluation Board Layout (Top View)

Figure 56. Evaluation Board Layout (Bottom View)

SOLDERING INFORMATION AND RECOMMENDED

PCB LAND PATTERN

Figure 57 shows the recommended land pattern for ADL5523.

To minimize thermal impedance, the exposed pad on the

package underside is soldered down to a ground plane. If

multiple ground layers exist, they are stitched together using

vias (a minimum of five vias is recommended). Pin 3 to Pin 6

can be left unconnected or can be connected to ground. For

more information on land pattern design and layout, refer to

the AN-772 Application Note, A Design and Manufacturing

Guide for the Lead Frame Chip Scale Package (LFCSP).

1.53mm

2.03mm

4

5

8

0.71mm

1

Figure 57. Recommended Land Pattern

Table 7. Recommended Components and Positions of Matching Components for Basic Connections Tuned for Optimal Noise

Frequency

(MHz)

C11

(Size

0402)

C2

(Size

0402)

C3

(Size

0402)

C4

(Size

0402)

C5

(Size

0402)

L12

(Size

0403)

L22

Size

0403)

R13

(Size

0603)

R24

(Size

0603)

TR1

(mm)

TR2

(mm)

C1

Position

C3

Position

500

Open

0 Ω

Open

Open

100 nF

9 nH

12 nH

1.3 kΩ

0 Ω

0

0

C1

N/A

900

2.4 pF

0 Ω

Open

Open

100 nF

8.2 nH

3.4 nH

1.3 kΩ

0 Ω

0

0

C1

N/A

1300

2.7 pF

0 Ω

1.0 nF

Open

100 nF

3.4 nH

0 Ω

1.3 kΩ

0 Ω

0

8.0 × 0.6

C1

6

1950

1.6 pF

0 Ω

1.0 nF

Open

100 nF

1.0 nH

0 Ω

1.3 kΩ

0 Ω

2.5 × 0.6

5.5 × 0.6

C1

4

2140

1.6 pF

0 Ω

1.0 nF

Open

100 nF

1.0 nH

0 Ω

1.3 kΩ

0 Ω

5.0 × 0.6

3.0 × 0.6

C1

2

2600

0.75 pF

0 Ω

1.0 nF

Open

100 nF

1.0 nH

0 Ω

1.3 kΩ

0 Ω

8.0 × 0.6

0

C1

C3

3500

0.5 pF

0 Ω

1.0 nF

Open

100 nF

2.4 pF5

0 Ω

1.3 kΩ

0 Ω

7.0 × 0.6

1 × 0.6

C1

1

1

The Murata GJM High-Q series capacitor is recommended for C1.

2

The Coilcraft High Q 0403HQ or 0402HP inductors are recommended for L1 and L2.

3

If R2 = 8 Ω, reduce R1 to 600 Ω.

4

If R2 = 8 Ω, use a high power resistor (0.2 W rating minimum).

5

Note that at 3500 MHz, a capacitor, not an inductor, is used at L1.