ADL5906

Data Sheet

Rev. 0 | Page 28 of 32

EVALUATION BOARD

The ADL5906-EVALZ is a fully populated, 4-layer, FR4-

based evaluation board. For normal operation, it requires a

5 V/100 mA power supply. The 5 V power supply must be

connected to the VPOS and GND test loops. The RF input

signal is applied to the SMA connector (RFIN). The output

voltage is available on the SMA connector (VOUT1) or on the

test loop (VOUT). Configuration options for the evaluation

board are listed in Table 8.

BIAS AND POWER

DOWN CONTROL

1

NIC

LINEAR-IN-dB VGA

(NEGATIVE SLOPE)

26pF

2

VPOS1

VPOS2

3

GND1

VREF

VTGT

GND2

4

11

10

9

5

CRMS

C9

0.1µF

6

VRMS

7

VSET

8

16

15

14

13

VTEMP

NIC

RFIN–

RFIN+

NIC

EPAD

ADL5906

12

2.3V

TEMPERATURE

SENSOR

G = 5

R3

60.4Ω

C10

10nF

RFIN

TC2

VOUT

VOUT1

VREF

VTGT

GND

C12

10nF

R12

270Ω

R9

1.5kΩ

R11

2kΩ

R10

3.74kΩ

R6

0Ω

R1

0Ω

R2

(OPEN)

R15

(OPEN)

VSET

VPOS

C3

0.1µF

C4

100pF

C7

0.1µF

C5

100pF

TADJ/

PWDN

Figure 63. Evaluation Board Schematic

Table 8. Evaluation Board Configuration Options

Component

Function/Notes

Default Value

RFIN, R3, C10,

C12

RF input. The evaluation board is configured for single-ended drive on the RFIN+ pin (Pin 14).

Capacitors C10 and C12 have been set large enough so that the full frequency range of the

device is covered. If operation down to 10 MHz is not required, the value of these capacitors

can be reduced.

RFIN = SMA connector,

C10 = C12 = 10 nF,

R3 = 60.4 Ω

VTGT, R10,

R11

VTGT interface. R10 and R11 are set up to provide 0.8 V to VTGT derived from VREF. If R10 and

R11 are removed, an external voltage can be applied on the VTGT test point.

VTGT = black test loop,

R10 = 3.74 kΩ,

R11 = 2 kΩ,

VTGT = 0.8 V

VPOS, GND,

C3, C4, C5,C7

Power supply interface and decoupling. Apply the power supply for the evaluation board to

the VPOS and GND test loops. The nominal supply decoupling consists of a 100 pF capacitor and a

0.1 µF capacitor on each power supply pin, with the 100pF capacitor placed closer to the pin.

VPOS = red test loop,

GND = black test loop,

C3 = C7 = 0.1 µF,

C4 = C5 = 100 pF