Analog Devices AD8338-EVALZ Manual de usuario

Evaluation Board User Guide

UG-559

One Technology Way •P. O . Box 9106 •Norwood, MA 02062-9106, U.S.A. •Tel: 781.329.4700 •Fax: 781.461.3113 •www.analog.com

Evaluating the AD8338 Low Power VGA

PLEASE SEE THE LAST PAGE FOR AN IMPORTANT

WARNING AND LEGAL TERMS AND CONDITIONS. Rev. B | Page 1 of 8

FEATURES

Full featured evaluation board for the AD8338

On-board voltage regulator

On-board potentiometers for direct adjustment, with test

points for electronic adjustment

All analog design, no software needed

EVALUATION KIT CONTENTS

AD8338-EVALZ evaluation board

AD8338-EVALZ user guide (UG-559)

ADDITIONAL EQUIPMENT NEEDED

A signal generator

A power supply capable of 6 V to 20 V output

An oscilloscope with a 100 MHz minimum bandwidth

3 SMA (M) to BNC (M) cables

ONLINE RESOURCES

AD8338 data sheet

UG-559 user guide

GENERAL DESCRIPTION

This user guide describes the AD8338 evaluation board and

discusses common configurations. The design of this board

(AD8338-EVALZ) emphasizes simplicity and ease of use,

which is evident in the minimalist approach to connector

implementation.

The AD8338 data sheet, available at www.analog.com, covers

the details for the operation of the AD8338. The AD8338 data

sheet should be consulted in conjunction with this user guide.

The data sheet not only assists designers in their end

applications but also provides important information to

understand the operation of the AD8338 evaluation board,

especially its initial configuration and power up.

AD8338-EVALZ EVALUATION BOARD

Figure 1.

11510-001

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UG-559 Evaluation Board User Guide

Rev. B | Page 2 of 8

TABLE OF CONTENTS

Features .............................................................................................. 1

Evaluation Kit Contents................................................................... 1

Additional Equipment Needed....................................................... 1

Online Resources.............................................................................. 1

General Description......................................................................... 1

AD8338-EVALZ Evaluation Board................................................ 1

Revision History ............................................................................... 2

Evaluation Board Quick Start Procedures .................................... 3

Initial Setup ................................................................................... 3

Initial Connections....................................................................... 3

Powering up the AD8338 ............................................................ 3

Configuring for Single-Ended Input, Differential Output ......3

Evaluation Board Hardware.............................................................4

Power Supplies ...............................................................................4

Input Controls................................................................................4

Modes and Input and Output Signals.........................................4

Default Operation and Jumper Selection Settings....................4

Evaluation Board Schematic ............................................................6

Ordering Information.......................................................................7

Bill of Materials..............................................................................7

REVISION HISTORY

3/16—Rev. A to Rev. B

Changes to Figure 1.......................................................................... 1

Changes to Features and Evaluation Kit Contents Sections ....... 1

Changes to Evaluation Board Quick Start Procedures................ 3

Combined Input Signals and Output Signals Headings to Modes

and Input and Output Signals......................................................... 3

Changes to the Modes and Input and Output Signals Section... 4

8/13—Rev. 0 to Rev. A

Changes to Power Supplies Section................................................ 5

Changes to Figure 6.......................................................................... 6

5/13—Revision 0: Initial Version

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Evaluation Board User Guide UG-559

Rev. B | Page 3 of 8

EVALUATION BOARD QUICK START PROCEDURES

INITIAL SETUP

The AD8338 evaluation board needs only a few external

connections. Setting up this board for the first time requires

the following:

•A dc supply to power the evaluation board from 6 V to

20 V (6 V is preferred)

•Cables to connect the board to the signal source

•Cables to connect the board to the oscilloscope

INITIAL CONNECTIONS

First, connect two SMA to BNC cables from the output SMA

connectors (OUTP, OUTM) to the oscilloscope. Set the

oscilloscope to 1 MΩ input impedance. The AD8338 is not

specified to drive 50 Ω impedances; therefore, it must drive a

high impedance load.

When using the AD8338 in standalone mode, which is fully

differential in and out, set up the signal source as a differential

output using two channels. Set the phase of the first channel to

be in phase and set the second channel to be out of phase (180°).

Figure 2. Basic Connections for the AD8338 Evaluation Module,

Differential Mode

POWERING UP THE AD8338

Take the following steps to power up the AD8338 evaluation

board:

1. Before applying any signals or supplies, set the jumpers to

their default settings, as indicated on the printed circuit

board (PCB).

2. Set the power supply to 6 V.

3. Enable the output.

4. Set the output amplitude onthesignal generator to 0.1 V

on each channel (200 mVdifference amplitude). Note

that the AD8338-EVALZ board includes on-board 50 Ω

terminators.

5. Adjust the potentiometer (labeled GAIN ADJ) counter-

clockwise until stopped.

6. Enable the outputs.

Upon correct configuration, the output signal appears on the

oscilloscope. Manually adjust gain by adjusting the GAIN ADJ

potentiometer. If these work, then basic operation of the

AD8338-EVALZ is verified.

CONFIGURING FOR SINGLE-ENDED INPUT,

DIFFERENTIAL OUTPUT

The AD8338-EVALZ is equipped with the ADA4940-1

differential driver amplifier. Bring this amplifier into the signal

chain through the setting ofthe J5, J6, J7, and J8jumpers as

highlighted in Figure 3.

When these jumpers (J5 to J7 and J8) are set, the input

connectors (J3 and J4) are disconnected from the AD8338, and

fed into the ADA4940-1. Input Connector J4 becomes inert and

is no longer necessary and Input Connector J3 becomes the

single-ended input source. The ADA4940-1 operates in unity-

gain difference.

Figure 3. AD8338-EVALZ Board with Jumpers Set for

Single-Ended Input Mode

OSCILLOSCOPE

AD8338

EVALUATION BOARD

DIFFERENTIAL

OUTPUT

SIGNAL

SOURCE

11510-002

11510-003

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UG-559 Evaluation Board User Guide

Rev. B | Page 4 of 8

EVALUATION BOARD HARDWARE

POWER SUPPLIES

The AD8338 evaluation board includes the ADP1720 low

dropout regulator (LDO). The LDO supplies a very clean 5.0 V

supply to the AD8338 and ADA4940-1.

Note that, because the supply input to the evaluation board is

not reverse bias protected, it is important to exercise care when

connecting your power supplies to prevent damage.

INPUT CONTROLS

The AD8338-E VA L Z has two primary input controls, GAIN

ADJUST and AGC SET (see Figure 1). An external voltage

applied to the respective test points overrides the potentiometer,

allowing for direct electronic control.

The MODE signal can also be overridden with an external

signal by driving the associated test point.

MODES AND INPUT AND OUTPUT SIGNALS

AGC Mode

AGC mode attempts to regulate the output magnitude to a

target rms voltage. This mode requires altering some jumper

settings. As shown in Figure 6, Jumper J10 is shifted by one pin.

For easy identification, refer to the silkscreen reference on the

evaluation board. (See Figure 7 for electrical information;

changing connection from Pin 2 and Pin 3 to Pin 1 and Pin 2.)

This connects the GAIN pin to the DETO pin, and puts the

evaluation board into AGC mode. After altering the jumper

settings, set the rms voltage by applying a voltage of the 0 V to

3.0 V range on the VAGC pin.

When the AGC mode is disabled, the MODE pin selects the

direction of the gain slope, either positive or negative. While the

AGC mode is disabled, the GAIN pin directly controls the gain

with an input ranging between 0.1 V and 1.1 V. When the AGC

circuit is not in use, tie the VAGC pin to VREF.

In this mode, the user controls the rms output level through

applying an input signal to VAGC. For the lowest gain, VAGC is

tied to VREF, where the loop attempts to attenuate the output to

0 V rms.

As the input to VAGC moves away from the 1.5 V of VREF (in

either the positive or negative direction), the gain increases.

Enable or disable offset nulling through the removal or placement

of Jumper J12. By default, the jumper is not installed, enabling

offset nulling. The application of the offset nulling feature applies a

capacitor between OFNS and VREF, where the internal correction

circuit passes signals of a higher frequency.

Input Signals

The signal inputs to the evaluation board start with SMA con-

nectors designated by J3 and J4. On the board, these signals are

terminated to ground with 49.9 Ω resistors. The inputs are then

fed into the inputs of the AD8338 directly (in the default config-

uration), or to the inputs of an ADA4940-1 differential amplifier.

In the worst-case scenario, the effective input impedance seen

by the signal generator is 45 Ω (a VSWR match of 1.1:1).

Output Signals

The AD8338 outputs swing nearly up to 1.5 V relative to VREF,

regardless of device power supply. On the evaluation board,

these outputs are ac-coupled through 0.1 μF capacitors and

should not be loaded with terminating values less than

500 Ω (per each output). Below 500 Ω, the linearity of the

outputs begins to degrade.

DEFAULT OPERATION AND JUMPER SELECTION

SETTINGS

Factory Default Configuration

The AD8338 evaluation board ships with a default configuration

shown in Figure 4 whereby offset nulling is enabled, MODE is

set to high, and the system gain increases by rotating GAIN

ADJ clockwise.

Figure 4. Standard Jumper Configuration

11510-007

J6 J7J8

J11

J9 J12

J10

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Evaluation Board User Guide UG-559

Rev. B | Page 5 of 8

Configuration for Decreasing Gain with Increasing

Voltage on GAIN Pin

Figure 5 shows the basic connections of the evaluation board.

MODE is set to low to achieve these results. In this configuration,

turning GAIN ADJ clockwise causes a decrease in applied gain.

At full rotation clockwise, the gain equals 0 dB.

Figure 5. Jumper Configuration for MODE = Low

Configuration for Using AGC Loop

For the application of the AGC loop, set MODE on the AD8338

to high. Set the DETO jumper (P5) as shown in Figure 6. With

the board configured as illustrated in Figure 6, the signal into

VAGC sets the output rms level.

Figure 6. Jumper Settings for AGC Mode

11510-007

J6 J7J8

J11

J9 J12

J10

11510-007

J6 J7J8

J11

J9 J12

J10

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UG-559 Evaluation Board User Guide

Rev. B | Page 6 of 8

EVALUATION BOARD SCHEMATIC

Figure 7. Schematic

11510-010

DNS R2

DNS

0.33 µF

DNS

2.2µF

DNS

C14

2.2µF

R10

10kΩ

R11

10kΩ

R13

499Ω

C16

2.2µF

C17

2.2µF

R18

DNS

49.9Ω

1kΩ

1kΩ R9

R12

1kΩ

R14

24.9Ω

2.2µF

0.1µF

2.2µF

C10

2.2µF

POT1

10kΩ

R15

4.02kΩ

R16

1kΩ

C11

2.2µF

POT2

10kΩ

GND

GND GND

GND

GND GND

GNDGND

GNDGND GND

AD8338

WM5534-ND

J10

005-01-0003

J11 005-01-0003

J12

005-01-0003

VSUPPLY

VIN

VREF

VAGC

VGAIN

VMODE

INPR

INPD

INMD

INMR

GND

MODE

GAIN

DETO

VAGC

OFSN

FBKM

OUTM

VREF

OUTP

FBKP

VBAT

–

ADA4940-1_SO

DIS VOCM

VS+

VS–

GND

VIN

EN GND

OUT

ADP1720ARMZ-5-R7

J14J15

J13

GND

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Evaluation Board User Guide UG-559

Rev. B | Page 7 of 8

ORDERING INFORMATION

BILL OF MATERIALS

Table 1.

Qty. Reference Designator Description Manufacturer Part Number

4 J7, J8, J9, J12 Standard 0.100 spacing TE Connectivity 5-146269-1

1 D1 0603 LED: green Dialight 598-8060-102F

1 C8 0.10 μF capacitor, 25 V, 0603 package Kemet C0603C104K3RAC7411

2 C1, C2 1 μF ceramic capacitor, 6.3 V, 0603 package Murata GRM033R60J105MEA2D

4 J5, J6, J10, J11 Inline 3-pin header TE Connectivity 4-103321-5

2 R10, R11 10 kΩ resistor, 0603 size Vishay CRCW060310K0FKEA

2 POT1, POT2 10k Vishay T73YB103KT20

1 J14 Red large testpoint Kobiconn 151-107-RC

2 J13, J15 Black, large test point Kobiconn 151-103-RC

5 R7, R8, R9, R12, R16 1.0 kΩ, 0.1 W, 0603 KOA Speer RK73H1JTTD1001F

C5, C6, C7, C9, C10,C11,

C14, C16, C17

2.2 μF capacitor, 0805 package

TDK

C2012X7R1C225K125AB

1 R14 24.9 Ω resistor, 1%, 0603 Vishay CRCW060324R9FKEA

1 R15 4.02 kΩ resistor, 1% Vishay CRCW06034K02FKEB

2 R5, R6 49.9 Ω resistor, 0603 KOA Speer RK73H1JTTD49R9F

1 R13 499 Ω resistor, 0603 Vishay CRCW0603499RFKEA

1 U1 AD8338, low power, 80 dB VGA, low

frequency to 18 MHz

Analog Devices, Inc. AD8338ACPZ-R7

1 U3 Low power, low distortion ADC driver Analog Devices ADA4940-1ARZ

1 U2 4 V to 28 V input LDO, 50 mA output, 5 V Analog Devices ADP1720ARMZ-5-R7

4 J1, J2, J3, J4 Standard size end launch SMA connector Cinch Connectivity

Solutions

142-0701-801

8 J5, J6, J7, J8, J9, J10, J11,

J12

Shunt jumpers(placed over assembled headers); a

golden board is provided for reference

3M 969102-0000-DA

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UG-559 Evaluation Board User Guide

Rev. B | Page 8 of 8

NOTES

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 StandardTerms 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 One TechnologyWay, Norwood, MA 02062, USA. Su

bject 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 Agr

eement and the Evaluation Board shall all be considered the confidential and proprietary information of ADI. 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. Customer may not disassemble, decompile or reverse engineer chips on the Evaluation Board. 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. 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 WITH RESPECT 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. 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 in accordance with 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.

registered trademarks are the property of their respective owners.

UG11510-0-3/16(B)

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