ADL5321

Rev. 0 | Page 13 of 16

EVALUATION BOARD

The schematic of the ADL5321 evaluation board is shown in

Figure 27. This evaluation board uses 25 mil wide traces and is

made from IS410 material (lead-free version of FR4). The

evaluation board comes tuned for operation in the 2500 MHz to

2700 MHz tuning band. Tuning options for other frequency bands

are also provided in Table 9. The recommended placement for

these components is provided in Table 10. The inputs and outputs

should be ac-coupled with appropriately sized capacitors. DC

bias is provided to the amplifier via an inductor connected to

the RFOUT pin. A bias voltage of 5 V is recommended.

1

2

(2)

3

ADL5321

C6 10µF

C5 10nF

C4 10pF

L1

9.5nH

VCC

GND

C2

10pF

C3

1.2pF

C1

1.0pF

C7

OPEN

λ

1

λ

3

2

λ

Figure 27. Evaluation Board, 2500 MHz to 2700 MHz

Table 9. Evaluation Board Configuration Options

Component

Function

2500 MHz to 2700 MHz

3400 MHz to 3850 MHz

C1, C2

AC coupling capacitors

C1 = 0402, 1.0 pF

C1 = 0402, 10 pF

C2 = 0402, 10 pF

C2 = 0402, 10 pF

C4, C5, C6

Power supply bypassing capacitors

C4 = 0603, 10 pF

C4 = 0603, 10 pF

C5 = 0603, 10 nF

C5 = 0603, 10 nF

C6 = 1206, 10 μF

C6 = 1206, 10 μF

L1

DC bias inductor

0603, 9.5 nH

0603, 9.5 nH

C3, C7

Tuning capacitors

C3 = 0402, 1.2 pF

C3 = 0402, 1.2 pF

C7 = 0402, open

C7 = 0402, 1.0 pF

VCC, GND

Power supply connections

VCC, red test loop

VCC, red test loop

GND, black test loop

GND, black test loop

Table 10. Recommended Component Spacing on Evaluation Board

Frequency (MHz)

λ1 (mils)

λ2 (mils)

λ3 (mils)

λ4 (mils)

2500 to 2700

240

75

89

325

3400 to 3850

90

35

40

416