ANALOG DEVICES ADRF5716-EVALZ Silicon Digital Attenuator User Guide
- June 1, 2024
- Analog Devices
Table of Contents
ANALOG DEVICES ADRF5716-EVALZ Silicon Digital Attenuator
Specifications
- Product Name: ADRF5716 Silicon Digital Attenuator
- Attenuation Control Range: 48 dB
- Frequency Range: 100 MHz to 30 GHz
- Manufacturing Process: Silicon on Insulator (SOI)
Product Usage Instructions
Equipment Needed
- DC power supplies
- Network analyzer
General Description
- The ADRF5716 is a 2-bit digital attenuator with a wide attenuation control range. The evaluation board, ADRF5716-EVALZ, allows users to assess the features and performance of the ADRF5716.
Power Supply and Control Inputs
- The ADRF5716 requires +3.3V supply voltage (VDD), -3.3V supply voltage (VSS), control inputs D5 and D6, latch enable (LE), and ground (GND). These pins should be decoupled with a 100 pF capacitor for stable operation.
RF Inputs and Outputs
- The ADRF5716-EVALZ features four edge-mounted 2.92 mm connectors for RF inputs and outputs, providing easy connectivity for testing purposes.
FAQ
- Q: What is the frequency range of the ADRF5716?
- A: The ADRF5716 operates in the frequency range of 100 MHz to 30 GHz.
- Q: How can I calibrate the ADRF5716-EVALZ?
- A: Additional thru line is provided on the evaluation board for calibration purposes. Connect your test equipment accordingly for calibration.
FEATURES
- Full-featured evaluation board for the ADRF5716
- Easy connection to test equipment
- Additional thru line for calibration
EQUIPMENT NEEDED
- DC power supplies
- Network analyzer
GENERAL DESCRIPTION
- The ADRF5716 is a 2-bit digital attenuator with 48 dB attenuation control range, manufactured in the silicon-on-insulator (SOI) process.
- This user guide describes the ADRF5716-EVALZ evaluation board, which is designed to simply evaluate the features and performance of the ADRF5716. A photograph of the evaluation board is shown in Figure 1.
- The ADRF5716 data sheet provides full specifications for the ADRF5716. Refer to the ADRF5716 data sheet with this user guide when using the ADRF5716-EVALZ.
ADRF5716-EVALZ EVALUATION BOARD PHOTOGRAPH
EVALUATION BOARD HARDWARE
OVERVIEW
The ADRF5716-EVALZ is a connectorized board, assembled with the ADRF5716 and
its application circuitry. All components are placed on the primary side of
ADRF5716-EVALZ. An assembly drawing for the ADRF5716-EVALZ is shown in Figure
8, and an evaluation board schematic is shown in Figure 7.
BOARD LAYOUT
The ADRF5716-EVALZ is designed using RF circuit design techniques on a 4-layer
printed circuit board (PCB). The PCB stack-up is shown in Figure 2.
The outer copper layers are 1.5 oz (2.2 mil) thick and the inner layers are
0.5 oz (0.7 mil) thick. The top dielectric material is 12 mil Rogers 4003,
which provides 50 Ω controlled impedance and optimizes high-frequency
performance.
All RF traces are routed on the top layer, and the second layer is used as the
ground plane for RF transmission lines. The remaining two layers are also
ground planes filled with FR4 material to manage the thermal rise during high-
power operations and are supported with dense and filled vias to the PCB
bottom for thermal relief. The overall board thickness is approximately 62 mil
for mechanical strength.
The RF transmission lines are designed using a coplanar waveguide (CPWG) model
with a width of 16 mils and ground spacing of 6 mils to have a characteristic
impedance of 50 Ω. Ground via fences are arranged on both sides of the CPWG to
improve isolation between nearby RF lines and other signal lines. The exposed
ground pad of the ADRF5716, 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, thru vias to provide the lowest possible thermal
resistance path from the top to the bottom of the PCB. The connections from
the package ground lead to the ground are kept as short as possible.
POWER SUPPLY AND CONTROL INPUTS
The ADRF5716-EVALZ has two power-supply inputs, three control inputs, and
ground, as shown in Table 1. The DC test points are populated on the VDD, VSS,
D5, D6, LE, and GND pins. A 3.3 V supply is connected to the DC test points on
the VDD pin, and the −3.3 V supply is connected to the DC test points on the
VSS pin. A ground reference can be connected to GND. Connect the control
inputs, D5, D6, and LE to 3.3 V or 0 V. The typical total current consumption
for the ADRF5716 is between 630 mA and 730 mA. The VDD and VSS supply pins and
the control pins of the ADRF5716 are decoupled with a 100 pF capacitor.
RF INPUTS AND OUTPUTS
The ADRF5716-EVALZ has four edge-mounted, 2.92 mm connectors for the RF inputs
and outputs, as shown in Table 2.
TEST PROCEDURE
BIASING SEQUENCE
To bias up the ADRF5716-EVALZ, perform the following steps:
- Ground the GND test point.
- Bias up the VDD test point.
- Bias up the VSS test point.
- Bias up the D5, D6, and LE test points.
- Apply an RF input signal.
The ADRF5716-EVALZ is shipped fully assembled and tested. Figure 3 provides a basic test setup diagram to evaluate the S-parameters using a network analyzer. Perform the following steps to complete the test setup and to verify the operation of the ADRF5716-EVALZ:
- Connect the GND test point to the ground terminal of the power supply.
- Connect the VDD test point to the voltage output terminal of the 3.3 V supply.
- Connect the VSS test point to the voltage output terminal of the −3.3 V supply. Note that the current from the VDD test point is approximately 130 μA and from the VSS test point is approximately 500 μA.
- Connect the D5, D6, and LE test points to the voltage output terminal of the 3.3 V supply. The ADRF5716 can be configured in different modes by connecting the control test points to 3.3 V or 0 V, as shown in Table 3.
- Connect a calibrated network analyzer to the ATTIN and ATTOUT 2.92 mm connectors. Sweep the frequency from 100 MHz to 30 GHz, and set the power to 10 dBm.
- The ADRF5716-EVALZ is expected to have an insertion loss of 2.90 dB at 30 GHz. See the expected results in the Expected Results section.
Additional test equipment is needed to fully evaluate the device’s functions
and performance. For third-order intercept point evaluation, use two signal
generators and a spectrum analyzer. A high-isolation power combiner is also
recommended.
For power compression and power handling evaluations, use a 2- 2-channel power
meter and a signal generator. A high enough power amplifier is also
recommended at the input. Test accessories, such as couplers and attenuators,
must have enough power handling. Note that the measurements performed at the
2.92 mm connectors of the ADRF5716-EVALZ include the losses of the 2.92 mm
connectors and the PCB. The thru line must be measured to calibrate out the
effects on the ADRF5716-EVALZ. The thru line is the summation of an RF input
line and an RF output line that is connected to the device and equal in
length.
EXPECTED RESULTS
EVALUATION BOARD SCHEMATIC AND ARTWORK
ORDERING INFORMATION
BILL OF MATERIALS
ESD Caution
ESD (electrostatic discharge) sensitive device. Charged devices and circuit
boards can discharge without detection. Although this product features
patented or proprietary protection circuitry, damage may occur on devices
subjected to high-energy ESD. Therefore, proper ESD precautions should be
taken to avoid performance degradation or loss of functionality.
Legal Terms and Conditions
By using the evaluation board discussed herein (together with any tools,
components documentation or support materials, the “Evaluation Board”), you
are agreeing to be bound by the terms and conditions set forth below
(“Agreement”) unless you have purchased the Evaluation Board, in which case
the Analog Devices Standard Terms and Conditions of Sale shall govern. Do not
use the Evaluation Board until you have read and agreed to the Agreement. Your
use of the Evaluation Board shall signify your acceptance of the Agreement.
This Agreement is made by and between you (“Customer”) and Analog Devices,
Inc. (“ADI”), with its principal place of business at Subject to the terms and
conditions of the Agreement, ADI hereby grants to Customer a free, limited,
personal, temporary, non-exclusive, non-sublicensable, non-transferable
license to use the Evaluation Board FOR EVALUATION PURPOSES ONLY. Customer
understands and agrees that the Evaluation Board is provided for the sole and
exclusive purpose referenced above, and agrees not to use the Evaluation Board
for any other purpose. Furthermore, the license granted is expressly made
subject to the following additional limitations: Customer shall not (i) rent,
lease, display, sell, transfer, assign, sublicense, or distribute the
Evaluation Board, and (ii) permit any Third Party to access the Evaluation
Board. As used herein, the term “Third Party” includes any entity other than
ADI, Customer, their employees, affiliates and in-house consultants. The
Evaluation Board is NOT sold to Customer; all rights not expressly granted
herein, including ownership of the Evaluation Board, are reserved by ADI.
CONFIDENTIALITY. This Agreement and the Evaluation Board shall all be
considered the confidential and proprietary information of ADI. The customer
may not disclose or transfer any portion of the Evaluation Board to any other
party for any reason. Upon discontinuation of use of the Evaluation Board or
termination of this Agreement, Customer agrees to promptly return the
Evaluation Board to ADI. ADDITIONAL RESTRICTIONS. Customers may not
disassemble, decompile or reverse engineer chips on the Evaluation Board. The
customer shall inform ADI of any occurred damages or any modifications or
alterations it makes to the Evaluation Board, including but not limited to
soldering or any other activity that affects the material content of the
Evaluation Board. Modifications to the 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. The 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 KIND
TO IT. ADI SPECIFICALLY DISCLAIMS ANY REPRESENTATIONS, ENDORSEMENTS,
GUARANTEES, OR WARRANTIES, EXPRESS OR IMPLIED, RELATED TO THE EVALUATION BOARD
INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTY OF MERCHANTABILITY, TITLE,
FITNESS FOR A PARTICULAR PURPOSE OR NONINFRINGEMENT OF INTELLECTUAL PROPERTY
RIGHTS. IN NO EVENT WILL ADI AND ITS LICENSORS BE LIABLE FOR ANY INCIDENTAL,
SPECIAL, INDIRECT, OR CONSEQUENTIAL DAMAGES RESULTING FROM CUSTOMER’S
POSSESSION OR USE OF THE EVALUATION BOARD, INCLUDING BUT NOT LIMITED TO LOST
PROFITS, DELAY COSTS, LABOR COSTS OR LOSS OF GOODWILL.
ADI’S TOTAL LIABILITY FROM ANY AND ALL CAUSES SHALL BE LIMITED TO THE AMOUNT
OF ONE HUNDRED US DOLLARS ($100.00). EXPORT. The customer agrees that it will
not directly or indirectly export the Evaluation Board to another country and
that it will comply with all applicable United States federal laws and
regulations relating to exports. GOVERNING LAW. This Agreement shall be
governed by and construed under the substantive laws of the Commonwealth of
Massachusetts (excluding conflict of law rules). Any legal action regarding
this Agreement will be heard in the state or federal courts having
jurisdiction in Suffolk County, Massachusetts, and Customer hereby submits to
the personal jurisdiction and venue of such courts. The United Nations
Convention on Contracts for the International Sale of Goods shall not apply to
this Agreement and is expressly disclaimed.
©2023 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. One Analog Way, Wilmington, MA 01887-2356, U.S.A.
Read User Manual Online (PDF format)
Read User Manual Online (PDF format) >>