Analog Devices ADRF5515A-EVALZ User Manual Download Page 3

User Guide

UG-1891

EVALUATION BOARD HARDWARE

analog.com

Rev. 0 | 3 of 9

OVERVIEW

The ADRF5515A-EVALZ is preinstalled with connectors (end

launch SMA) and assembled with the 

ADRF5515A

 and its applica-

tion circuitry. All components are placed on the primary side of the

ADRF5515A-EVALZ. An assembly drawing for the ADRF5515A-

EVALZ is shown in 

Figure 8

. An ADRF5515A-EVALZ schematic is

provided in 

Figure 9

.

ADRF5515A-EVALZ LAYOUT

The ADRF5515A-EVALZ is designed using RF circuit design tech-

niques on an 8-layer printed circuit board (PCB). The PCB stack-up

is shown in 

Figure 2

.

Figure 2. Evaluation Board Stack-Up

The outer copper layers are 2 oz (2.7 mil) thick and the inner layers

are 1 oz (1.3 mil) thick. The top dielectric material is 10 mil Rogers

4350B, which provides 50 Ω controlled impedance and optimizes

high frequency performance. The remaining six dielectric layers are

FR4 based filler layers that improve the mechanical strength of the

ADRF5515A-EVALZ and meet the overall board thickness of 62 mil.

All RF traces are routed on the top layer, and the remaining

seven layers are ground planes that provide a solid ground for

RF transmission lines and help to manage thermal rise on the

ADRF5515A-EVALZ during high power operations.

The RF transmission lines are designed using a coplanar wave-

guide (CPWG) model with a width of 18 mil and ground spacing

of 13 mil to have a characteristic impedance of 50 Ω. Ground via

fences are arranged on both sides of a CPWG to improve isolation

between nearby RF lines and other signal lines.

The exposed ground pad of the ADRF5515A, which is soldered

on the PCB ground pad, is the main thermal conduit for heat

dissipation. The PCB ground pad is densely populated with filled

through vias to provide the lowest possible thermal resistance

path temperature from the top to the bottom of the PCB. The

connections from the package ground leads to ground are kept as

short as possible.

POWER SUPPLY INPUTS

The ADRF5515A-EVALZ has five power supply inputs and two

grounds, as shown in 

Table 1

. The dc test points are populated only

on the SWVDDB, VDD1_A, and VDD1_B test points, whereas the

VDD2_A and VDD2_B points are shorted to VDD1_A and VDD1_B,

respectively, via 0 Ω resistors. A single 5 V supply is connected

to the dc test points on the SWVDDB, VDD1_A, and VDD1_B test

points. Ground reference can be connected to the GND or GND1

test point. The typical total current consumption for the ADRF5515A

is 190 mA in receive operation, high gain mode.

Each supply pin for the LNAs of the ADRF5515A-EVALZ is decou-

pled with 1 nF and 10 µF capacitors. A 10 µF capacitor is used on

the supply line for the switches of the ADRF5515A-EVALZ.

Table 1. Test Points for Power Supply Inputs
Test Points

Description

VDD1_A

Supply LNA Stage 1 on Channel A

VDD2_A

Supply LNA Stage 2 on Channel A, do not insert (DNI)

VDD1_B

Supply LNA Stage 1 on Channel B

VDD2_B

Supply LNA Stage 2 on Channel B, DNI

SWVDDB

Supply switches on Channel A and Channel B

GND

Ground

GND1

Ground

The ADRF5515A-EVALZ also has edge mounted Subminiature

Version A (SMA) connectors for power supply inputs, as shown in

Table 2

. These SMA connectors are not populated by default and

can be connected by the user.

Table 2. SMA Connectors for Power Supply Inputs
SMA Connectors

Description

VDD_A

Supply LNA on Channel A

VDD_B

Supply LNA on Channel B

SWVDDB

Supply switches on Channel A and Channel B

Summary of Contents for ADRF5515A-EVALZ

Page 1: ...egrated dual channel 3 3 GHz to 4 0 GHz 20 W receiver front end ideally suited for time division duplex ing TDD wireless infrastructure applications The ADRF5515A consists of a high power switch and a two stage low noise amplifier LNA on each channel This user guide describes the ADRF5515A EVALZ designed to easily evaluate the features and performance of the ADRF5515A A photograph of the ADRF5515A...

Page 2: ... Photograph 1 Evaluation Board Hardware 3 Overview 3 ADRF5515A EVALZ Layout 3 Power Supply Inputs 3 Control Inputs 4 RF Inputs and Outputs 4 Test Procedure 5 Biasing Sequence 5 Expected Results 6 Evaluation Board Artwork and Schematic 7 Ordering Information 9 Bill of Materials 9 REVISION HISTORY 6 2021 Revision 0 Initial Version ...

Page 3: ...red on the PCB ground pad is the main thermal conduit for heat dissipation The PCB ground pad is densely populated with filled through vias to provide the lowest possible thermal resistance path temperature from the top to the bottom of the PCB The connections from the package ground leads to ground are kept as short as possible POWER SUPPLY INPUTS The ADRF5515A EVALZ has five power supply inputs ...

Page 4: ...B are dc coupled whereas the RXO_x is ac coupled using a series capacitor of 10 pF close to the SMA connector The SMA connectors and series components on the thru lines are not populated by default and can be connected by the user to measure and calibrate out the evaluation board loss effects To measure and calibrate out the evaluation board loss effects the user must connect these connectors and ...

Page 5: ...ve a high and low receive gain of 36 dB and 17 dB respectively at 3 6 GHz See the expected results in Figure 4 to Figure 7 Table 5 Truth Table Switch Control SWCTRL Signal Path Low Receive operation High Transmit operation Table 6 Truth Table Receive Operation PD BP_A BP_B Receive Operation Low Low High gain mode Low High Low gain mode High Low Power down high isolation mode High High Power down l...

Page 6: ...alog com Rev 0 6 of 9 EXPECTED RESULTS Figure 4 Receive Operation High Gain Figure 5 Receive Operation Antenna to Termination Isolation Figure 6 Receive Operation Low Gain Figure 7 Transmit Operation Antenna to Termination Insertion Loss ...

Page 7: ...User Guide UG 1891 EVALUATION BOARD ARTWORK AND SCHEMATIC analog com Rev 0 7 of 9 Figure 8 ADRF5515A EVALZ Assembly Diagram ...

Page 8: ...User Guide UG 1891 EVALUATION BOARD ARTWORK AND SCHEMATIC analog com Rev 0 8 of 9 Figure 9 ADRF5515A EVALZ Schematic ...

Page 9: ...e Evaluation Board must comply with applicable law including but not limited to the RoHS Directive TERMINATION ADI may terminate this Agreement at any time upon giving written notice to Customer Customer agrees to return to ADI the Evaluation Board at that time LIMITATION OF LIABILITY THE EVALUATION BOARD PROVIDED HEREUNDER IS PROVIDED AS IS AND ADI MAKES NO WARRANTIES OR REPRESENTATIONS OF ANY KI...

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