Data Sheet

ADL5513

EVALUATION BOARD

analog.com

Rev. B | 24 of 25

Table 5. Evaluation Board Configuration Options (Continued)

Component

Function

Default Value

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 reducing the portion of VOUT that is fed back to VSET. R3 can be used as a

back-terminating resistor or as part of a single-pole, low-pass filter. If a reduction in slope is desired, a

voltage divider can be installed at the output using R3 and RL.

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)

Output interface—controller mode. In controller mode, the ADL5513 can control the gain of an external

component. To allow for this, remove the R4 resistor. A setpoint voltage is applied to Pin VSET. The

value of this setpoint voltage 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 applied to the

ADL5513 input by a directional coupler. The voltage at the VOUT pin is applied to the gain control of

the variable gain element. The magnitude of the control voltage can optionally be reduced via a voltage

divider comprising R3 and RL, or a low-pass filter can be installed using R3 and CL.

R2 = open (Size 0402)

R3 = 1 kΩ (Size 0402)

R4 = open (Size 0402)

R5 = open (Size 0402)

R10 = 0 Ω (Size 0402)

RL = CL = open (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 and R9 can be used for a voltage divider

from the VPOS node to set the TADJ voltage at different frequencies. The ADL5513 can be disabled by

applying a voltage of VPOS − 0.3 V to this node.

R6 = open (Size 0402)

R7 = 0 Ω (Size 0402)

R8 = open (Size 0402)

R9 = open Ω (Size 0402)