ADL5604

Rev. 0 | Page 20 of 24

EVALUATION BOARD

The schematic of the ADL5604 evaluation board is shown in

Figure 43. This evaluation board uses 25 mils wide, 50 Ω traces

and is made from IS410 material, with a 23mils gap to ground.

The evaluation board is tuned for operation at 2140 MHz. The

inputs and outputs should be ac-coupled with appropriately

sized capacitors; therefore, for low frequency applications, C1

and C2 may need to be increased. DC bias is provided to the

output stage via an inductor connected to the RFOUT pin. A

bias voltage of 5 V is recommended. The evaluation board has a

short non 50 Ω line on its output to accommodate the four

output pins and allow for easier low inductance output matching.

The pads for Pin 9 to Pin 12 are included on this microstrip line

and are included in all matches. Figure 46 shows the close-up

image of the recommended output pad. The evaluation board

also has hash marks close to the input and output of the

ADL5604, separated by 40 mils. The hash mark closest to the

input is 127 mils from the chip, and the hash mark closest to the

output is 20 mils from the chip.

U2 and its associated circuitry are required only if it is desired

to power down the ADL5604. On the evaluation board, it is

necessary to remove R2 and install a 0 Ω resistor in the R4

position to enable this feature.

RFIN

VBIAS

RFOUT

12

VCC2

11

VBIAS

10

RFIN

9

RFIN

1

2

3

4

ADL5604

GND1

VCC1

L1

16nH

VCC2

VBIAS

GND2

R9

0

Ω

R10

0

Ω

R6

0

Ω

R8

0

Ω

R3

OPEN

L2

OPEN

R4 OPEN

GND3

AD8009

C15

0.1µF

R1

301

Ω

–VS

+VS

U2

NOTE 1

C5

2.4pF

C2

22pF

R2

0

Ω

R5

0

Ω

NOTES

1. THE COMPONENTS CONTAINED INSIDE THE DASHED BOX ARE ONLY REQUIRED IF IT IS

DESIRED TO POWER DOWN THE ADL5604.

C1

0

Ω

C3

1.3pF

C4

2.7pF

C11

10nF

C12

0.1µF

C9

10nF

C10

0.1µF

C6

10nF

C7

0.1µF

C8

10µF

RFOUT

RFOUT

RFOUT

RFOUT

C14

0.1µF

13

8

14

7

15

6

16

5

GND GND GND GND

GND GND GND GND

Figure 43. Evaluation Board, 2140 MHz