Data Sheet

ADL5387

Rev. C | Page 25 of 27

Table 4. Evaluation Board Configuration Options

Component

Function

Default Condition

VPOS, GND

Power Supply and Ground Vector Pins.

Not Applicable

R1, R3, R6

Power Supply Decoupling. Shorts or power supply decoupling resistors.

R1, R3, R6 = 0 Ω (0805)

C1, C2, C3,

C4, C8, C9

The capacitors provide the required dc coupling up to 2 GHz.

C2, C4, C8 = 100 pF (0402)

C1, C3, C9 = 0.1 µF (0603)

C5, C6, C7,

C10, C11

AC Coupling Capacitors. These capacitors provide the required ac coupling from

50 MHz to 2 GHz. For operation down to 30 MHz, C10 and C11 should be changed to

0.01 µF.

C5, C6, C10, C11 = 1000 pF (0402),

C7 = Open

R4, R5,

R9 to R16

Single-Ended Baseband Output Path. This is the default configuration of the evaluation

board. R14 to R16 and R4, R5, and R13 are populated for appropriate balun interface.

R9, R10 and R11, R12 are not populated. Baseband outputs are taken from QHI and IHI.

The user can reconfigure the board to use full differential baseband outputs. R9 to R12

provide a means to bypass the 9:1 TCM9-1 transformer to allow for differential baseband

outputs. Access the differential baseband signals by populating R9 to R12 with 0 Ω and

not populating R4, R5, R13 to R16. This way the transformer does not need to be removed.

The baseband outputs are taken from the SMAs of Q_HI, Q_LO, I_HI, and I_LO.

R4, R5, R13 to R16 = 0 Ω (0402),

R9 to R12 = Open

L1, L2,

R7, R8

Input Biasing. Inductance and resistance sets the input biasing of the common base

input stage. Default value is 120 nH for operation above 50 MHz. For operation down to

30 MHz, L1 and L2 should be changed to 680 nH.

L1, L2 = 120 nH (0402)

R7, R8 = 0 Ω (0402)

T2, T3

IF Output Interface. TCM9-1 converts a differential high impedance IF output to a single-

ended output. When loaded with 50 Ω, this balun presents a 450 Ω load to the device.

The center tap can be decoupled through a capacitor to ground.

T2, T3 = TCM9-1, 9:1 (Mini-Circuits)

C12, C13

Decoupling Capacitors. C12 and C13 are the decoupling capacitors used to reject noise

on the center tap of the TCM9-1.

C12, C13 = 0.1 µF (0402)

R17

LO Input Interface. The LO is driven as a single-ended signal. Although, there is no

performance change for a differential signal drive, the option is available by placing a

transformer (T4, ETC1-1-13) on the LO input path.

R17 = 0 Ω (0402)

T1

RF Input Interface. ETC1-1-13 is a 1:1 RF balun that converts the single-ended RF input

to differential signal.

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

R2

R2 = Open