Texas Instruments AFE8201EVM User manual

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July 2004
User’s Guide
SBAU099
High-Speed Communications

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Mailing Address: Texas Instruments
Post Office Box 655303 Dallas, Texas 75265
Copyright 2004, Texas Instruments Incorporated

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
Copyright 2004, Texas Instruments Incorporated

EVM WARNINGS AND RESTRICTIONS
It is important to operate this EVM within the input voltage range of 0 V to 5 V and the output
voltage range of 0 V and 3.3 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
50°C. The EVM is designed to operate properly with certain components above 50°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
Copyright 2004, Texas Instruments Incorporated

Preface
Read This First
About This Manual
This user’s guide provides the information needed to set up and operate the
AFE8201EVM evaluation module. For a more detailed description of the
AFE8201, 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.
How to Use This Manual
Throughout this document, the acronym EVM and the phrase evaluation
module are synonymous with the AFE8201EVM.
Information About Cautions
This book contains cautions.
This is an example of a caution statement.
A caution statement describes a situation that could potentially
damage your software or equipment.
The information in a caution or a warning is provided for your protection.
Please read each caution carefully.

Contents
iv
Related Documentation From Texas Instruments
The following documents provide information regarding Texas Instrument inte-
grated circuits used in the assembly of the AFE8201EVM. 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:
AFE8201 SBWS016
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.

1
AFE8201EVM
AFE8201EVM
The AFE8201EVM is designed to assist with evaluating the performance of
the AFE8201 analog-to-digital converter (ADC) with digital downconverter.
Topic Page
1 Overview 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Purpose 2
EVM Basic Functions 2
Power Requirements 2
Operational Procedure 3
2 Circuit Description 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Analog Inputs 4
Clock Inputs 4
Serial Interface 4
Outputs 4
3 Software Description 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Xilinx FPGA Software 5
Visual Basic Software 5
4 Physical Description 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Schematic, PCB Layout, and Bill of Materials 6

Overview
2
1 Overview
This user’s guide gives a general overview of the AFE8201 evaluation module
(EVM), and provides a general description of the feature and functions to be
considered while using this module.
1.1 Purpose
The AFE8201EVM is a platform for evaluating the AFE8201 ADC with digital
downconverter under various signal, reference, and supply conditions. This
document should be used in combination with the EVM schematic diagrams
(see Figure 1, Figure 2, and Figure 3) and the supplied USB interface drive
software.
1.2 EVM Basic Functions
Analog input to the AFE is provided via external SMA connectors. The single-
ended input is converted into a differential signal at the input of the device. The
input path is transformer-coupled.
The EVM provides one external SMA connector for converting the single-
ended input to a differential AFE clock signal at the input of the device.
Digital outputs from the EVM are via two 40-pin connectors and two DSK
peripheral 80-pin connectors.
The AFE internal registers can be programmed using the onboard USB inter-
face module through a PC.
Power connections to the EVM are made through either a 5V DC supply, or
3.3V and 1.8V supplies.
1.3 Power Requirements
The EVM can be powered in one of two ways:
1) The EVM can be powered directly with a +5V supply if using the AC/DC
(+90V to +265V AC input/+5V DC output adaptor) module; or
2) The EVM can be powered by lab power from +5V analog, 3.3V analog,
3.3V digital, and 1.8V digital supplies.
Voltage Limits
Exceeding the maximum input voltages can damage EVM
components. Undervoltage may cause improper operation of some
or all of the EVM components.

Operational Procedure
3
AFE8201EVM
1.4 Operational Procedure
The AFE8201EVM provides a flexible means of evaluating the AFE8201 in a
number of modes of operation. The following basic setup procedure can be
used as a board confidence check.
1) Verify all jumper settings against the jumper lists in Table 1, Table 2, and
Table 3.
Table 1. Pin Jumper List Table
Jumper Function Installed Default
JP1 GSET of Test DAC Yes 3.3V Analog
JP2 AC/DC or Lab 5V DC
Voltage Supply Switch Yes Lab 5V DC
JP3 Digital Input Voltage:
Lab 5V DC/3.3V Yes Lab 5V DC
JP4 3.3V Digital Supply Operation:
Lab 3.3V/Regulator 3.3V Yes Lab 3.3V
JP5 1.8V Digital Supply Operation:
Lab 1.8V/Regulator 1.8V Yes Lab 1.8V
JP6 3.3V Analog Supply Operation:
Lab 3.3V/Regulator 3.3V Yes Lab 3.3V
Table 2. Jumper and Push Button Switch List Table
Jumper Function Default
S1 FGPA Reset Open
S3 Program Reset Open
JP7 Aux DAC Output Open
Table 3. Relay List Table
Jumper Function
K1A DSK Connector Option to SCK
K2A DSK Connector Option to MOSI
K3A DSK Connector Option: MISO or DOUT1
2) Connect supplies to the EVM in the following manner:
-+5V AC/DC Supply to JP2
-+5V Lab Supply to P6
-+3.3V Analog Supply to P8
-+3.3V/1.8V Lab Supply to P7

Circuit Description
4
2 Circuit Description
The schematic diagrams for the EVM are located at the end of this document
(see Figure 1, Figure 2, and Figure 3).
2.1 Analog Inputs
The EVM can be configured to provide the AFE with transformer-coupled in-
puts from a single-ended source. The inputs are provided via SMA connectors
(J6) for a transformer-coupled input.
2.2 Clock Inputs
The initial configuration of the EVM provides a transformer-coupled clock input
(J8) to the AFE differential clock.
2.3 Serial Interface
The EVM has a USB interface input through FPGA to control a serial bus to
operate of the registers of the AFE.
2.4 Outputs
The data outputs from the AFE have two possible connection options: two
40-pin connectors (P3 and P4), or two DSK 80-pin connectors (P1 and P5).
-40-pin connector output pins:
JI Output: on connector P3 (Digital Interface 1), from pin 4 (LSB) to pin
34 (MSB), even pins only (odd pins are ground).
JQ output: on connector P4 (Digital Interface 2), from pin 2 (LSB) to pin
32 (MSB), even pins only (odd pins are ground).
JStrobe: On connector P3, pin 2 (sample I and Q data on falling edge of
strobe)
-80-pin connector output pins:
JSee schematic diagrams shown in Figure 1, Figure 2, and Figure 3.

Software Description
5
AFE8201EVM
3 Software Description
3.1 Xilinx FPGA Software
The Xilinx FPGA program has been preinstalled in the Xilinx EPROM.
3.2 Visual Basic Software
The user must install the Visual Basic and USB driver on a PC in order to run
the Visual Basic program. The AFE8201 registers can then be configured
through the PC GUI by the Visual Basic program.
3.2.1 Installation of the VB Software
1) Unzip the VB file afe8201 eval.zip provided in the AFE8201EVM package.
2) Run dotnetfx.exe. This program installs the required environment for the
Visual Basic.net programs to run on.
3) Runsetup.exe. This program installs the AFE8201 evaluation board code
in /Program Files/Texas Instruments/AFE8201 Eval Control 1.0. The pro-
gram name is Control SPI.exe.
4) Plug the USB connector from the evaluation board into an available USB
port on the PC. The PC should begin the driver installation. The drivers are
in the temporary directory where the original files were unzipped.
5) Power up the evaluation board.
6) Start the control program by clicking File|Open and selecting default.afe
from the dialog box. This program loads a typical configuration into the
AFE8201.
3.2.2 Operation of the VB Software
1) The IF frequency and sampling frequencies are entered as floating point
values. MHz are used as the units, but the actual units do not matter, as
long as the frequency and sampling units are the same. The control pro-
gram calculates the required register values for the mixer.
2) Phase offset is in degrees and is also a floating point value.
3) Each time you type data into a control, you must hit Enter for the new value
to take over. The AFE is updated as soon as the control is changed.
4) The Refresh button will rewrite everything (registers and memories) into
the AFE. This is useful if you need to change devices or otherwise power
down the EVM board.
5) The memory contents are shown in three lists. To change a value, double-
click on the appropriate line in the list. The values relevant to that line ap-
pear just below the three lists. Type the new value where indicated and
click Change.
Note: Power-Down Check Box
There are two power-down check boxes. The checkbox under ADC/DAC
Control sets power-down via a register write, whereas the checkbox under
Test Control sets the PWD pin high.

Physical Description
6
6) To save a configuration, click File|Save and enter the name you want to
give the file. The default extension is .afe. The configuration files can also
be edited in a text editor, but be careful to use only a single space as a de-
limiter.
7) TheChannel A/Channel B radio buttons under the test control determine
which filter output is sent to the output pins.
8) The control DAC is set to produce a full-scale ramp using the DIN inter-
face. The DAC Value setting under ADC/DAC Control has no effect. A
readback of the DAC value register will return a random value between 0
and 4095.
4 Physical Description
This section describes the physical characteristics and printed circuit board
(PCB) layout of the EVM and lists the components used on the module.
4.1 Schematic, PCB Layout, and Bill of Materials
The schematic diagrams are shown in Figure 1, Figure 2, and Figure 3.
The EVM is constructed on a 4-layer PCB using FR-4 material. The individual
layers are shown in Figure 4, Figure 5, Figure 6, and Figure 7.
The Bill of Materials is listed in Table 4.

Physical Description
7
AFE8201EVM
Figure 1. Schematic: AFE8201

Physical Description
8
Figure 2. Schematic: Xilinx

Physical Description
9
AFE8201EVM
Figure 3. Schematic: Power Supply

Physical Description
10
Figure 4. PCB Layout: Top Layer (top view)

Physical Description
11
AFE8201EVM
Figure 5. PCB Layout: Ground Plane (top view)

Physical Description
12
Figure 6. PCB Layout: Power Plane (top view)

Physical Description
13
AFE8201EVM
Figure 7. PCB Layout: Bottom Layer (bottom view)

Bill of Materials
14
Table 4. Bill of Materials
Qty Part Number Components Description Vendor
3 PCC2287CT−ND C1, C5, C6 Capacitor, 1µF, ceramic 0603 package Digi−Key 1 C1608C0G1H120J C18 Capacitor, 12pF, ceramic 0603 package Digi−Key
44 C0603C103J5RACTU C2, C3, C4, C14, C16, C17, C19, C21, C22,
C23, C25, C26, C27, C29, C33, C45, C55, C56, C61, C66, C73, C75, C79, C81, C83, C85, C86, C89, C90, C91, C94, C97, C98, C99, C102, C103, C104, C105, C107, C109, C110, C112, C113, C114
Capacitor, 0.01µF, ceramic 0603 package Digi−Key
3 ECS−T1AD107R C34, C35, C36 Capacitor, 100µF, T491D package Digi−Key 4 399−3003−1−ND C40, C44, C47, C49 Capacitor, 47µF, T491B package Digi−Key 1 ECS−T1AY106R C63 Capacitor, 10µF, T491A package Digi−Key 8 ECS−T1AX106R C7, C12, C13, C37, C38, C39, C41, C43, Capacitor, 10µF, T491B package Digi−Key
37 C1608Y5V1H104Z C8, C9, C10, C11, C20, C28, C30, C31, C32,
C42, C46, C48, C50, C51, C52, C53, C54, C57, C58, C59, C60, C62, C64, C65, C67, C68, C69, C70, C71, C72, C74, C76, C77, C78, C87, C88, C115
Capacitor, 0.1µF, ceramic 0603 package Digi−Key
12 445−1356−1−ND C80, C82, C84, C92, C93, C95, C96, C100,
C101, C106, C108, C111 Capacitor, 0.33µF, ceramic 805 package Digi−Key
2 MBR1100RLOSTR−ND D1, D2, Diode, 1N5818, axial Digi−Key 1 P11532CT−ND D3, LED Digi−Key 4 BNX002−01 F1, F2, F3, F4 4 142−0701−201 J6, J8, J10, J11 SMA Johnson Components 1 CP−002AH−ND J12 DC_POWER_JACK_PJ−002AH Digi−Key
31 J7 Pin strip for jumpers and JTAG Digi−Key
3 113−1−C−5/3D K1, K2, K3 Relay Pickering 2 TFM−140−32−S−D−LC P1, P5 Connector, DSP Samtec