Preliminary Technical Data

ADL5519

Rev. PrB | Page 23 of 27

EVALUATION BOARD

Table 5. Evaluation Board (Rev. A) Configuration Options

Component

Function

Default Conditions

VPOS, GND1,

GND2, GND3

Supply and Ground Connections. GND1, GND2, GND3 are internally

connected together.

Not applicable

R5, R6, C1, C2, C3,

C4

Input Interface.

The 52.3

Ω resistor in positions R5 and R6 combine with the ADL5519's

internal input impedance to give a broadband input impedance of about 50

Ω. Capacitors C1, C2, C3, and C4 are dc-blocking capacitors. A reactive

impedance match can be implemented by replacing R5[R6] with an inductor

and C1[C3] and C2[C4] with appropriately valued capacitors.

R5 = 52.3

Ω (Size 0402)

C1 = 47 nF (Size 0402)

C2 = 47 nF (Size 0402)

R6 = 52.3

Ω (Size 0402)

C3 = 47 nF (Size 0402)

C4 = 47 nF (Size 0402)

R14

Temperature Sensor Interface:

The temperature sensor output voltage is available at the test point labeled

TEMP.

R14 = 0

Ω (Size 0603)

R13, R17, R18, R19,

R27, R28, R29

Temperature Compensation Interface.

The internal temperature compensation network is optimized for input signals

up to TBD GHz when the voltage applied to the ADJ[A,B] pin is TBD V. This

circuit can be adjusted to optimize performance for other input frequencies

by changing the value of this voltage. See Table 4 for specific voltage levels.

The pads for R27/R28 or R27/R29 can be used for voltage dividers to set the

ADJ[A,B] voltages for temperature compensation at different frequencies.

The individual log channels can be disabled by installing 0Ω resistors in

positions R18 and R19

R13 = open (size 0603)

R17 = open (size 0603)

R18 = 0

Ω (size 0603)

R19 = 0

Ω (size 0603)

R27 = 0

Ω (size 0603)

R28 = open (size 0603)

R29 = open (size 0603)

R8, R12, R15, R16,

R20, R21, R22, R23,

C13, C14

Output Interface—Measurement Mode.

In measurement mode, a portion of the output voltage is fed back to Pin

VSTA[VSTB] via R8[R12]. The magnitude of the slope of the OUTA[OUTB]

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

R8 = 0

Ω (Size 0603)

R12 = 0

Ω (Size 0603)

R15 = open (Size 0603)

R16 = open (Size 0603)

R20 = 0

Ω (Size 0603)

R21 = 0

Ω (Size 0603)

R22 = open (Size 0603)

R23 = open (Size 0603)

C13 = open (Size 0603)

C14 = open (Size 0603)

R8, R12, R22, R23

Output Interface—Controller Mode.

In this mode, R8[R12] must be open. In controller mode, the ADL5519 can

control the gain of an external component. A setpoint voltage is applied to Pin

VSTA[VSTB], the value of which corresponds to the desired RF input signal level

applied to the corresponding ADL5519 RF input. A sample of the RF output

signal from this variable-gain component is selected, typically via a

directional coupler, and applied to ADL5519 RF input. The voltage at Pin

OUTA[OUTB] is applied to the gain control of the variable gain element. A

control voltage is applied to Pin VSTA[VSTB]. The magnitude of the control

voltage can optionally be attenuated via the voltage divider comprising

R8[R12] and R22[R23], or a capacitor can be installed in position R22[R23] to

form a low-pass filter along with R8[R12].

R8 = 0

Ω (Size 0603)

R12 = 0

Ω (Size 0603)

R22 = open (Size 0603)

R23 = open (Size 0603)

R3, R4, R11, C7, C8

C11, C12, C15, C16

Power Supply Decoupling.

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

physically close to the ADL5519 and a 0.1 μF capacitor placed nearer to each

power supply input pin.

R3 = 0

Ω (Size 0603)

R4 = 0

Ω (Size 0603)

R11 = 0

Ω (Size 0603)

C7 = 100 pF (Size 0603)

C8 = 100 pF (Size 0603)

C11 = 100 pF (Size 0603)

C12 = 0.1 μF (Size 0603)

C15 = 0.1 μF (Size 0603)

C16 = 0.1 μF (Size 0603)