ADL5240

Data Sheet

Rev. A | Page 24 of 28

5

4

3

2

1

AMPIN

5

4

3

2

1

DSAOUT

C8

C5

R15

R17

R14

R16

R2

C17

2

3

1

S1

VDD

24

1

8

7

6

5

3

23

22

20

19

18

17

2

21

4

U1

R1

5

4

3

2

1

AMPOUT

C13

VCC

C4

5

4

3

2

1

DSAIN

C1

C14

C15

R11

R10

R13

R12

2

1

L1

VDD

VDD

D5

D4

D6

CLK_D0

DATA_D1

LE_D2

D3

0

DNI

1µF

RED

1200pF

0.1µF

100pF

DNI

0

DNI

0

0.1µF

DNI

0

68pF

470nH

0

DNI

0

DNI

ADL5240ACPZ

RED

DNI

0

DNI

0

0.1µF

0

DNI

0

DNI

100pF

VDD

NC

NC

DSAOUT

NC

NC

NC

NC

NC

NC

NC

NC

DSAIN

NC

NC

VDD

AGND

AGND

AGND

AGND

AGND

AGND

AGND

AGND

AGND

AGND

AGND

Figure 41. ADL5240 Evaluation Board

Table 8. EvaluationBoard ConfigurationOptions

Component

Function/Notes

Default Value

C1, C2

Input/output dc blocking capacitors for DSA.

C1, C2 = 100 pF

C3, C4

Input/output dc blocking capacitors for AMP.

C3, C4 = 0.1 µF

C5, C6, C7

Power supply decoupling foramplifier. The bias associated with the AMPOUT pin is

the most sensitive to noise because the bias is connected directly to the output. The

smallest capacitor (C7) should be the closest to the AMPOUT pin.

C5 = 1 µF

C6 = 1.2 nF

C7 = 68 pF

C8

Power supply decoupling forthe DSA.

C8 = 0.1 µF

L1

The bias for the amplifier comes through L1 when VCC is connected to a 5 V supply.

L1 should be high impedance for the frequency of operation while providing low

resistance for the dc current.

L1 = 470 nH

R1, R2

Resistors to connect the supply for the amplifier and the DSA to the same VDD plane. R1, R2 = open

R10, R11, R14, R15

These resistorsareused to terminate RF couplingonto thetraces andto close theloop.

R10, R11, R14, R15 =

0 Ω

R12, R13, R16, R17

R12 and R16 are replaced with capacitors, and R13 and R17 are replaced with 0 Ω to

close the loop.

R12, R13, R16, R17 =

open

S1

Switch to change between the serial mode and parallel mode of operation. Connect

to supply for parallel mode and to ground for serial mode operation.

S1 connected to

ground