ADL5390

Data Sheet

Rev. A | Page 20 of 23

Table 4. Evaluation Board Configuration Options

Component

Function

Default Conditions

R7, R9, R11, R14,

R15, R19, R20,

R21, C15, C19,

W3, W4

I Channel Baseband Interface. Resistors R7 and R9 may be installed to

accommodate a baseband source that requires a specific terminating

impedance. Capacitors C15 and C19 are bypass capacitors. For single-ended

baseband drive, the Potentiometer R11 can be used to provide a bias level to

the unused input (install either W3 or W4).

R7, R9 = not installed

R11 = potentiometer, 2 kΩ, 10 turn

(Bourns)

R14 = 4 kΩ (Size 0603)

R15 = 44 kΩ (Size 0603)

R19, R20, R21 = 0 Ω (Size 0603)

C15, C19 = 0.1 µF

(Size 0603)

W3 = jumper (installed)

W4 = jumper (open)

R1, R3, R10, R12,

R13, R16, R17,

R18, C16, C20,

W1, W2

Q Channel Baseband Interface. See the I Channel Baseband Interface section.

R1, R3 = not installed

R10 = potentiometer, 2 kΩ, 10 turn

(Bourns)

R12 = 4 kΩ (Size 0603)

R13 = 44 kΩ (Size 0603)

R16, R17, R18 = 0 Ω

(Size 0603)

C16, C20 = 0.1 µF (Size 0603)

W1 = jumper (installed)

W2 = jumper (open)

C11, C12

Baseband Low-Pass Filtering. By adding capacitor C11 between QFLP and

QFLM, and capacitor C12 between IFLP and IFLM, the 3 dB low-pass corner

frequency of the baseband interface can be reduced from 230 MHz (nominal)

as given by the equation in the Evaluation Board section.

C11, C12 = not installed

T1, C17, C18, L3,

L4

Output Interface. The 1:1 balun transformer, T1, converts the 50 Ω differential

output to 50 Ω single-ended. C17 and C18 are dc blocks. L3 and L4 provide dc

bias for the output.

C17, C18 = 10 nF (Size 0603)

T1 = ETC1-1-13 (M/A-COM)

L3, L4 = 120 nH (size 0603)

C2, C1, R2

C5, C6, R22

I and Q Channel RF Input Interface. The single-ended impedance to the

ADL5390 RF inputs is 200 Ω. Shunt terminations R2 and R22 of 66.5 Ω bring the

impedances to 50 Ω. C2 and C5 are dc blocks. C1 and C6 are used to ac-couple

the unused side of the differential inputs to common.

C2 = C1 = 10 nF (Size 0603)

R2 = 66.5 Ω (Size 0603)

C5 = C6 = 10 nF (Size 0603)

R22 = 66.5 Ω (Size 0603)

R4, R6, R5, C4, C7

C9, C3, C8, C10

Power Supply Decoupling.

R4, R6, R5 = 0 Ω (Size 0603)

C4, C7, C9 = 0.1 µF (Size 0603)

C3, C8, C10 = 100 pF (Size 0603)

R8, SW1

Output Disable Interface. The output stage of the ADL5390 is disabled by

applying a high voltage to the DSOP pin by moving SW1 to Position B. The

output stage is enabled moving SW1 to Position A. The output disable function

can also be exercised by applying an external high or low voltage to the DSOP

SMA connector with SW1 in Position A.

R8 = 10 kΩ (Size 0603)

SW1 = SPDT (Position A, output

enabled)