ADL5513

Preliminary Technical Data

Rev. PrA | Page 10 of 12

EVALUATION BOARD CONFIGURATION OPTIONS

Table 4. Evaluation Board Configuration Options

Component

Function

Default Value

C1, C2, R1

Input Interface.

The 52.3 Ω resistor in Position R1 combines with the internal input impedance of the

ADL5513 to give a broadband input impedance of about 50 Ω. C1 and C2 are dc-

blocking capacitors. A reactive impedance match can be implemented by replacing

R1 with an inductor and C1 and C2 with appropriately valued capacitors.

R1 = 52.3 Ω (Size 0402)

C1 = 47 nF (Size 0402)

C2 = 47 nF (Size 0402)

C3, C4, C5, C6,

R11, R12

Power Supply Decoupling

The nominal supply decoupling consists of a 100 pF filter capacitor placed physically

close to the ADL5513 and a 0.1 μF capacitor placed nearer to the power supply input

pin. If additional isolation from the power supply is required, a small resistance maybe

installed in between the power supply and the ADL5513. (R11, R12)

C3 = 0.1 μF (Size 0402)

C4 = 100 pF (Size 0402)

C5 = 100 pF (Size 0402)

C6 = 0.1 μF (Size 0402)

R11 = 0 Ω (Size 0402)

R12 = 0 Ω (Size 0402)

C7

Filter Capacitor

The low-pass corner frequency of the circuit that drives the VOUT pin can be lowered

by placing a capacitor between CLPF and ground. Increasing this capacitor increases

the overall rise/fall time of the ADL5513 for pulsed input signals.

C7= 1000 pF (Size 0402)

R2, R3 R4, R5, R10,

RL, CL

Output Interface—Measurement Mode.

In measurement mode, a portion of the output voltage is fed back to the VSET pin via R4.

The magnitude of the slope of the VOUT output voltage response can be increased by

terminating resistor or as part of a single-pole, low-pass filter.

R2 = open (Size 0402)

R3 = 1 kΩ (Size 0402)

R4 = 0 Ω (Size 0402)

R5 = open (Size 0402)

R10 = open (Size 0402)

RL = CL = open (Size 0402)

R4, R5, R10

Output Interface—Controller Mode.

In this mode, R4 must be open. In controller mode, the ADL5513 can control the gain of

an external component. A setpoint voltage is applied to Pin VSET, the value of which

corresponds to the desired RF input signal level applied to the ADL5513 RF input. A

sample of the RF output signal from this variable gain component is selected, typically

via a directional coupler, and applied to ADL5513 RF input. The voltage at the VOUT

pin is applied to the gain control of the variable gain element. A control voltage is

applied to the VSET pin. The magnitude of the control voltage can optionally be

attenuated via the voltage divider comprising R4 and R5, or a capacitor can be

installed in Position R5 to form a low-pass filter along with R4.

R4 = open (Size 0402)

R5 = open (Size 0402)

R10 = 0 Ω (Size 0402)

R6, R7, R8, R9

Temperature Compensation Interface.

A voltage source can be used to optimize the temperature performance for various

input frequencies. The pads for R8/R9 can be used for a voltage divider from the VPOS

R6 = open (Size 0402)

R7= 0 Ω (Size 0402)

R8 = open (Size 0402)

R9 = open Ω (Size 0402)

VPOS, GND

Supply and Ground Connections

Not Applicable