Texas Instruments VCA8613EVM Manuale utente

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June 2004

User’s Guide

SBOU021

High-Speed Communications

IMPORTANT NOTICE

Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications,

enhancements, improvements, and other changes to its products and services at any time and to discontinue

any product or service without notice. Customers should obtain the latest relevant information before placing

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accordance with TI’s standard warranty. Testing and other quality control techniques are used to the extent TI

deems necessary to support this warranty. Except where mandated by government requirements, testing of all

parameters of each product is not necessarily performed.

TI assumes no liability for applications assistance or customer product design. Customers are responsible for

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Mailing Address: Texas Instruments

Post Office Box 655303 Dallas, Texas 75265

EVM IMPORTANT NOTICE

Texas Instruments (TI) provides the enclosed product(s) under the following conditions:

This evaluation kit being sold by TI is intended for use for ENGINEERING DEVELOPMENT OR EVALUATION

PURPOSES ONLY and is not considered by TI to be fit for commercial use. As such, the goods being provided

may not be complete in terms of required design-, marketing-, and/or manufacturing-related protective

considerations, including product safety measures typically found in the end product incorporating the goods.

As a prototype, this product does not fall within the scope of the European Union directive on electromagnetic

compatibility and therefore may not meet the technical requirements of the directive.

Should this evaluation kit not meet the specifications indicated in the EVM User’s Guide, the kit may be returned

within 30 days from the date of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE

WARRANTY MADE BY SELLER TO BUYER AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED,

IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR ANY

PARTICULAR PURPOSE.

The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user

indemnifies TI from all claims arising from the handling or use of the goods. Please be aware that the products

received may not be regulatory compliant or agency certified (FCC, UL, CE, etc.). Due to the open construction

of the product, it is the user’s responsibility to take any and all appropriate precautions with regard to electrostatic

discharge.

EXCEPT TO THE EXTENT OF THE INDEMNITY SET FORTH ABOVE, NEITHER PARTY SHALL BE LIABLE

TO THE OTHER FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.

TI currently deals with a variety of customers for products, and therefore our arrangement with the user is not

exclusive.

TI assumes no liability for applications assistance, customer product design, software performance, or

infringement of patents or services described herein.

Please read the EVM User’s Guide and, specifically, the EVM Warnings and Restrictions notice in the EVM

User’s Guide prior to handling the product. This notice contains important safety information about temperatures

and voltages. For further safety concerns, please contact the TI application engineer.

Persons handling the product must have electronics training and observe good laboratory practice standards.

No license is granted under any patent right or other intellectual property right of TI covering or relating to any

machine, process, or combination in which such TI products or services might be or are used.

Mailing Address:

Texas Instruments

Post Office Box 655303

Dallas, Texas 75265

EVM WARNINGS AND RESTRICTIONS

It is important to operate this EVM within the input voltage range of ±5 V and the output voltage

range of 0 V and 5 V.

Exceeding the specified input range may cause unexpected operation and/or irreversible

damage to the EVM. If there are questions concerning the input range, please contact a TI

field representative prior to connecting the input power.

Applying loads outside of the specified output range may result in unintended operation and/or

possible permanent damage to the EVM. Please consult the EVM User’s Guide prior to

connecting any load to the EVM output. If there is uncertainty as to the load specification,

please contact a TI field representative.

During normal operation, some circuit components may have case temperatures greater than

60°C. The EVM is designed to operate properly with certain components above 70°C as long

as the input and output ranges are maintained. These components include but are not limited

to linear regulators, switching transistors, pass transistors, and current sense resistors. These

types of devices can be identified using the EVM schematic located in the EVM User’s Guide.

When placing measurement probes near these devices during operation, please be aware

that these devices may be very warm to the touch.

Mailing Address:

Texas Instruments

Post Office Box 655303

Dallas, Texas 75265

Preface

Read This First

About This Manual

This user’s guide provides the information needed to set up and operate the

VCA8613EVM evaluation module. For a more detailed description of the

VCA8613, please refer to the product data sheet available from the Texas In-

struments web site at http://www.ti.com. Additional support documents are

listed in the sections of this guide entitled Related Documentation from Texas

Instruments and Additional Documentation.

How to Use This Manual

Throughout this document, the acronym EVM and the phrase evaluation

module are synonymous with the VCA8613EVM.

Related Documentation From Texas Instruments

The following documents provide information regarding Texas Instrument inte-

grated circuits used in the assembly of the VCA8613EVM. These documents

are available from the TI web site. The last character of the literature number

corresponds to the document revision, which is current at the time of the writing

of this user’s guide. Newer revisions may be available from the TI web site at

http://www.ti.com or by calling the Texas Instruments Literature Response

Center at (800) 477−8924 or the Product Information Center at (972)

644−5580. When ordering, identify the document(s) by both title and literature

number.

Data Sheets: Literature Number:

VCA8613 SBOS200

Contents

If You Need Assistance

If you have questions regarding either the use of this evaluation module or the

information contained in the accompanying documentation, please contact

the Texas Instruments Product Information Center at (972) 644−5580 or visit

the TI Semiconductor Online Technical Support pages at http://www.ti.com.

FCC Warning

This equipment is intended for use in a laboratory test environment only. It may

generate, use, or radiate radio frequency energy and has not been tested for

compliance with the limits of computing devices pursuant to sub−part J of part

15 of the FCC regulations, which are designed to provide reasonable protec-

tion against radio frequency interference. Operation of this equipment in other

environments may cause interference with radio communications, in which

case the user at his own expense will be required to take whatever measures

may be required to correct this interference.

Trademarks

All trademarks are the property of their respective owners.

VCA8613EVM

The VCA8613EVM is designed to assist with evaluating the performance of

the VCA8613 variable gain amplifier.

Topic Page

1 Description 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2 Initial Configuration 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3 Signals 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4 Microcontroller 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5 Modes of Operation 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6 VCA8613EVM Full-Access Software 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

7 Schematic and PCB Layout 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

8 Bill of Materials 17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Description

1 Description

The VCA861xEVM is designed to provide ease of use in evaluating the

performance of the VCA8613 variable gain amplifier. The evaluation module

operates in three modes: Stand-Alone, PC-Control, and Direct-Control.

Stand-Alone mode uses an onboard microcontroller to enable the operation

of the VCA8613. The functionality in Stand-Alone mode is limited to

factory-programmed modes. PC-Control mode uses the included software to

operate all of the functions of the VCA8613. The software was written on

Windows2000 and its operation has been verified with Windows XP,

Windows2000, and Windows98. Direct-Control mode uses external control

and data signals to control the functions of the VCA8613.

The VCA8613EVM has the following features:

-Easy testing of the VCA8613

-Single-ended input

-Three modes of operation

JStand-Alone

JPC-Control

JDirect-Control

-Separately adjustable attenuation and gain ranges in PC-Control mode

2 Initial Configuration

2.1 Power Supply

The VCA861xEVM has provisions for three separate power supplies:

-+5V: Positive Supply with Integrated VCA Supply(1)

-−5V: Negative Supply for Output and CW Amplifiers

-+3V: Positive VCA Supply(1)

1) This positive VCA supply is not used when R1 is populated with a 0Ωresistor. If this supply

is used, then R1 must be removed.

The +3V input allows the VCA to be powered separately from the rest of the

evaluation module for supply current monitoring of the VCA only.

Signals

VCA8613EVM

3 Signals

3.1 Input Signals

The input signals are applied to SMA connectors J19 to J26. The input signals

should be provided from a low-impedance source (less than 100Ω) as a result

of the 4.5kΩinput impedance of the VCA. The inputs are ac-coupled into the

LNA of the VCA8613 through 0.01µF capacitors, and do not attenuate the in-

put signal.

3.2 Output Signals

The outputs of the evaluation module are located at SMA connectors J28

through J35 for the TGC outputs, and J9 to J18 for the CW outputs. The out-

puts from the VCA8613 are buffered with operational amplifiers.

3.3 TGC Outputs

The differential TGC outputs are buffered by op amps (OPA690) in a differen-

tial configuration with a differential gain of 1. When testing the VCA8613EVM,

outputs J28 through J35 (TGC outputs) must be terminated into 50Ωloads

such as those of a spectrum analyzer. This termination will result in the proper

matching for the output amplifiers, and no loss will have to be taken into ac-

count.

3.4 CW Outputs

The following diagram shows the CW output circuit. This circuit is duplicated

for each CW output.

Figure 1. CW Output Circuit

6.3kΩ

50ΩSMA

100Ω

Not

Populated

IIN

+1.25V

+3V

0Ω

OPA690

VCA861x

Output 0.01µF

0.1µF

220µH

The CW outputs are current outputs and require a current-to-voltage conver-

sion in order to view the outputs with an oscilloscope or spectrum analyzer.

The OPA690 op amp is used as the current-to-voltage converter. Provisions

have been made on the EVM board to monitor the current directly by the use

of JP1 and JP2. When monitoring of the current is needed, solder jumpers JP4

through JP13 should be removed to help alleviate any errors associated with

bias current requirements of the current-to-voltage converter.

Microcontroller

The CW outputs need a compliance voltage of +3V. The circuit in Figure 1

shows how the compliance voltage is applied to the VCA861x device through

a 220µH inductor. Extra provisions have been made to this circuit for future

VCA devices.

As configured from the factory, the CW output circuit allows the noise of the

CW path to be measured. This configuration is the reason for the large feed-

back resistor in the output amplifier circuit. However, when trying to sum more

than two channels to one CW output, this resistor may pose a problem. Before

summing more than two CW channels, this feedback resistor should be re-

duced in value. For help in determining the minimum value of resistor needed,

refer to the VCA8613 data sheet for more information about the maximum cur-

rent draw for the CW outputs.

4 Microcontroller

The VCA8613EVM contains a microcontroller to access functions on the

VCA8613. The microcontroller provides the evaluation module the ability to run

in a stand-alone mode or be controlled by software running on a PC. The micro-

controller is run from its own internal oscillator set to 12MHz. The only external

clock signals are those used to communicate to the VCA8613 via the serial data

clock line (for clocking data to the VCA8613), and the embedded clock signal in

the RS-232 communications circuit. The RS-232 clock operates only when data

is being sent from the PC to the microcontroller. The serial communication from

the PC to the microcontroller is set to 19200kbps. This baud rate is set internally

on the microcontroller and is configured automatically in the PC software.

5 Modes of Operation

There are three modes of operation for the VCA8613EVM: Stand-Alone, PC-

Control, and Direct-Control. The first two modes are accessed by using the S1

switches and the S2 pushbutton. S2 is used as the reset button to make pro-

gram changes on the microcontroller. Table 1 shows the different modes of op-

eration.

Table 1. VCA8613EVM Modes of Operation

SW3 SW2 SW1 Mode of Operation

0 0 0 Power Down

0 0 1 TGC Mode 1: Attenuator = 29dB, PGA gain = 21dB

0 1 0 TGC Mode 2: Attenuator = 29dB, PGA gain = 26dB

0 1 1 TGC Mode 3: Attenuator = 40dB, PGA gain = 26dB

1 0 0 CW Mode 1

1 0 1 CW Mode 2

1 1 0 CW Mode 3

1 1 1 PC-Control Mode or Direct-Control Mode

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