Texas Instruments ADS5102 EVM User manual

ADS5102/3 EVM
December 2001 AAP High-Speed Data Converter (Dallas)
User’s Guide
SLAU077

IMPORTANT NOTICE
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any product or service without notice. Customers should obtain the latest relevant information before placing
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TI warrants performance of its hardware products to the specifications applicable at the time of sale in
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
their products and applications using TI components. To minimize the risks associated with customer products
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Use of such information may require a license from a third party under the patents or other intellectual property
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Mailing Address:
Texas Instruments
Post Office Box 655303
Dallas, Texas 75265
Copyright 2001, 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
befitforcommercialuse.Assuch,thegoodsbeingprovidedmaynotbecompleteinterms
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.
Theuserassumesallresponsibilityandliabilityforproperandsafehandlingofthegoods.
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.
TIcurrentlydealswithavarietyofcustomersforproducts,andthereforeourarrangement
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.
Pleasereadthe EVMUser’s Guideand,specifically, the EVMWarnings 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.
Personshandlingtheproductmusthaveelectronicstrainingandobservegoodlaboratory
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 2001, Texas Instruments Incorporated

EVM WARNINGS AND RESTRICTIONS
It is important to operate this EVM within the specified input and output ranges as described
in the EVM user’s guide.
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.
Applyingloadsoutsideofthespecifiedoutputrangemayresultinunintendedoperationand/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.
Duringnormaloperation,somecircuitcomponentsmayhavecasetemperaturesgreaterthan
60°C.TheEVM isdesignedto operateproperlywith certain componentsabove 60°C aslong
astheinputandoutput rangesare maintained.Thesecomponentsincludebut arenot limited
tolinearregulators,switchingtransistors,passtransistors,andcurrentsenseresistors.These
typesof devicescanbeidentifiedusingtheEVM schematiclocated intheEVMUser’sGuide.
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 2001, Texas Instruments Incorporated

Information About Cautions and Warnings
v
Preface
Read This First
About This Manual
This user’s guide is to assist the user with the operation of the EVM using the
ADS5102/3 devices.
How to Use This Manual
This document contains the following chapters:
-Chapter 1—Overview
-Chapter 2—Physical Description
-Chapter 3—Circuit Description
Information About Cautions and Warnings
This book may contain cautions and warnings.
This is an example of a caution statement.
A caution statement describes a situation that could potentially
damage your software or equipment.
This is an example of a warning statement.
A warning statement describes a situation that could potentially
cause harm to you.
The information in a caution or a warning is provided for your protection.
Please read each caution and warning carefully.

Contents
vi
FCC Warning
This equipment is intended for use in a laboratory test environment only. It
generates, uses, and can radiate radio frequency energy and has not been
testedforcompliancewiththelimitsofcomputingdevicespursuanttosubpart
Jofpart15ofFCCrules,which aredesignedtoprovidereasonableprotection
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.

Contents
vii
Contents
1 Overview 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.1 Purpose 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.2 EVM Basic Functions 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.3 Power Requirements 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.4 ADS5102/3 EVM Operational Procedure 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2 Physical Description 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.1 PCB Layout 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2 Bill of Materials 2-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3 Circuit Description 3-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.1 Circuit Function 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.1.1 Analog Inputs 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.1.2 External Reference Inputs 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.1.3 Clock Inputs 3-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.1.4 Control Inputs 3-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.1.5 Power 3-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.1.6 Outputs 3-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2 Schematic Diagram 3-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figures
2–1 Top Layer 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2–2 Inner Layer 1, Ground Plane 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2–3 Inner Layer 2, Power Plane 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2–4 Bottom Layer 2-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Contents
viii
Tables
1–1 Two Pin Jumper List 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1–2 Three Pin Jumper List 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2–1 Bill of Materials 2-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3–1 Reference Voltage Adjustment Ranges 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3–2 Output Connector J15 3-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Notes, Cautions, and Warnings
Voltage Limits 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-1
Overview
Overview
This user’s guide gives a general overview of the ADS5102/3 evaluation
module (EVM) and provides a general description of the features and
functions to be considered while using this module.
Topic Page
1.1 Purpose 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.2 EVM Basic Functions 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.3 Power Requirements 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.4 ADS5102/3 EVM Operational Procedure 1-3. . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 1

Purpose
1-2
1.1 Purpose
The ADS5102/3 EVM provides a platform for evaluating the ADS5102/3
analog-to-digital converter (ADC) under various signal, reference, and supply
conditions. Use this document in combination with the EVM schematic
diagram supplied.
1.2 EVM Basic Functions
Analog input to the ADC is provided via two external SMA connectors. The
single-ended input the user provides is converted into a differential signal at
the input of the device. One input uses a differential amplifier, while the other
input is transformer coupled.
TheEVMprovidesanexternalSMAconnectionforinputoftheADCclock.The
usercansendthisclocktotheoutputconnectorwiththedigitaldataorprovide
asecondclocksourcetobesentinplaceoftheADCclock.Thisallowstheuser
to provide the required setup and hold times of the output data with respect to
theoutputclock.Seethe Clock Inputssectionfortheproperconfigurationand
operation.
DigitaloutputfromtheEVMisviaa40-pinconnector.Thedigital linesfromthe
ADC are buffered before going to this connector. More information on this
connector can be found in the ADC output section.
PowerconnectionstotheEVMareviabananajacksockets.Separatesockets
are provided for the analog and digital supply.
In addition to the internal reference provided by the ADS5102/3 device,
options are provided on the EVM to allow adjustment of the ADC references
via an onboard reference circuit. A precision voltage reference source, a
resistor network, and an operational amplifier (op amp) provide the
ADS5102/3 device reference voltages REFT and REFB.
1.3 Power Requirements
The EVM can be powered directly with a single 1.8-V supply if using the
module with transformer coupled input, internal reference source, and 1.8-V
logic outputs.
Avoltageof3.3VisrequiredfortheDRVDDpowerinputtoprovide3.3-Vlogic
outputs. A voltage of ±5 V is required if using external references and/or
differential amplifier input. Provision has also been made to allow the EVM to
be powered with independent 1.8-V analog and digital supplies to provide
higher performance.
Voltage Limits
Exceeding the maximum input voltages can damage EVM
components. Undervoltage may cause improper operation of
some or all of the EVM components.

ADS5102/3 EVM Operational Procedure
1-3
Overview
1.4 ADS5102/3 EVM Operational Procedure
The ADS5102/3 EVM provides a flexible means of evaluating the ADS5102/3
in a number of modes of operation. A basic setup procedure that can be used
as a board confidence check is as follows:
1) Verify all jumper settings against the schematic jumper list in Table 1–1
and Table 1–2:
Table 1–1.Two Pin Jumper List
Jumper Function Installed Removed Default
W10 External REFT feed External Internal Removed
W11 External REFB feed External Internal Removed
R39 Positive analog input Transformer coupled No connection Installed
R37 Negative analog input Transformer coupled No connection Installed
R38 Positive analog input Differential amplifier No connection Removed
R36 Negative analog input Differential amplifier No connection Removed
R43, R44 Output clock option ADC clock at output connector Buff clock at output
connector Removed
R42 Optional output clock
parallel termination Provides pullup termination No pullup termination Removed
R14 Optional ADC clock
parallel termination Provides pullup termination No pullup termination Removed
Table 1–2.Three Pin Jumper List
Jumper Function Location: Pins 1–2 Location: Pins 2–3 Default
W1 Band gap input voltage
(power down reference
mode)
REFT voltage to bandgap pin 1.25 V to bandgap pin Removed
W3 Transformer and diff amp
common mode select ADC output common mode voltage External common mode voltage 1–2
W4 Power down select Operate mode Power down mode 1–2
W5 Output enable select Data bus tristate Data bus enable 2–3
W6 Reference select External reference Internal reference 2–3
2) Connect supplies to the EVM as follows:
J1.8-V analog supply to J6 and return to J5
J1.8-V digital supply to J9 and return to J10
J3.3-V driver supply to J13 and return to J14
J5-V analog supply to J7 and return to J8
J–5-V analog supply to J11 and return to J8

ADS5102/3 EVM Operational Procedure
1-4
3) Switch power supplies on.
4) Useafunctiongeneratorwith50-Ωoutputtoinputa40-MHz,1.5-V offset,
3-V(p-p)amplitudesquarewavesignalintoJ3tobeusedastheADCclock.
Note:
The frequency of the clock must be within the specification for the device
speed grade.
5) Use a function generator with 50-Ωoutput to input a 1.5-V offset, 3-V(p-p)
amplitude square wave signal into J4 to be used as the buffered output
clock.
Note:
This signal must be the same frequency and synchronized with the ADC
clock.
6) Useafrequencygeneratorwith50-Ωoutputtoinputa1.5-MHz,0-Voffset,
0.4-V(p-p) amplitudesinewavesignalintoJ2.Thisprovidesatransformer
coupled differential signal to the ADC.
7) The digital pattern on the output connector J15 now represents a sine
wave and can be monitored using a logic analyzer.

2-1
Physical Description
Physical Description
ThischapterdescribesthephysicalcharacteristicsandPCBlayoutoftheEVM
and lists the components used on the module.
Topic Page
2.1 PCB Layout 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2 Bill of Materials 2-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 2

PCB Layout
2-2
2.1 PCB Layout
The EVM is constructed on a 4-layer, 104 mm (4.1 inch) x 114 mm (4.5 inch)
x 1,57 mm (0.062 inch) thick PCB using FR–4 material. Figure 2–1 through
Figure 2–4 show the individual layers.
Figure 2–1.Top Layer

PCB Layout
2-3
Physical Description
Figure 2–2.Inner Layer 1, Ground Plane

PCB Layout
2-4
Figure 2–3.Inner Layer 2, Power Plane

Bill of Materials
2-5
Physical Description
Figure 2–4.Bottom Layer
2.2 Bill of Materials
Table 2–1 lists the parts used in constructing the EVM.
Table 2–1.Bill of Materials
Description QTY Part Number MFG. REF DES
47 µF, tantalum, 10%, 10 V 5 10TPA47M SANYO C72–C76
0.1 µF,16 V, 10% capacitor 31 ECJ–1VB1C104K Panasonic C12–C37, C62–C66
10 µF, 10 V, 10% capacitor 9 GRM42X5R106K10 Murata C51–C54, C67–C71
0.01 µF, 50 V,10% capacitor 4AVX C47–C49 C60
1.0 µF, 10 V, 10% capacitor 10 AVX C40–C46, C58, C59, C77
22 pF, 50 V, 5%, capacitor 2 06035A220JAT2A AVX C38, C39
0.001 µF, 16 V, 10% capacitor 1 C50
0.047 µF,16 V, 10% capacitor 3 C55–C57
1.8 pF,16 V, 10% capacitor 2C1, C2

Bill of Materials
2-6
Table 2–1. Bill of Materials (Continued)
Description Qty. Part Number Mfg. Ref. Des.
470 pF,16 V, 10% capacitor 5 C3–C7
2.2 µF,16 V, 10% capacitor 1 C61
Ferrite bead 5 FB1–FB5
499-Ωresistor, 1/16 W, 1% 3 ERJ–3EKF499R0V Panasonic R9–R11
523-Ωresistor, 1/16 W, 1% 1 ERJ–3EKF523R0V Panasonic R12
49.9-Ωresistor, 1/16 W, 1% 9 ERJ–3EKF49R9V Panasonic R1–R8, R13
1-kΩresistor, 1/16 W, 1% 2R21, R22
2.49-kΩresistor, 1/16 W, 1% 1 R23
475-Ωresistor, 1/16 W, 1% 2R24, R26
953-Ωresistor, 1/16 W, 1% 1 R25
2-kΩresistor, 1/16 W, 1% 3 R33–R35
10-kΩresistor, 1/16 W, 1% 6 R15–R20
100-Ωresistor, 1/16 W, 1% 3 R30–R32
R37–R41
0-Ωresistor, 1/16 W, 1% 4 ERJ–3EKF0R00V Panasonic NOT INSTALLED:
R14, R36, R38, R42–R44
1-kΩresistor, 1/16 W, 1% 1 Panasonic R46
100-kΩresistor, 1/16 W, 1% 1 P100KHCT–ND Panasonic R47
3.01-kΩresistor, 1/16 W, 1% 1 Panasonic R45
9.53-kΩresistor, 1/16 W, 1% 1 ERJ–6GEY0R00V Panasonic R51
1K Pot 3 3296Y–102 Bourns R27–R29
Transformer 1 T1–1T–KK81 Mini-Circuits T1
SMA connectors 4 2262–0000–09 Macom J1–J4
Black test point 3 5011K Keystone TP9–TP11
Red test point 8 5000K Keystone TP1–TP8
2POS_header 2 TSW–150–07–L–S Samtec W10, W11
3POS_header 5 TSW–150–07–L–S Samtec W1, W3–W6
2-circuit jumpers 6 863–3285 Allied (molex)
40-pin header 1 TSW–120–07–L–D Samtec J15
Red banana jacks 5 ST–351A ALLIED J6, J7, J9, J1, J13
Black banana jacks 4 ST351B ALLIED J5, J8, J10, J14
ADS51002/3 1 ADS5102/3 TI U2
TPS79225 1 TPS79225DBVT TI U4
24-ΩR-Pack 2 742C163101JCT Bourns RP1, RP2
SN74AVC16244 1 SN74AVC16244DGGR TI U6
THS4141 1 THS4141ID TI U1
OPA4227 1 OPA4227UA TI U3
Stand off hex (1/4 x 1”) 4 219–2063 Allied

3-1
Circuit Description
Circuit Description
This chapter describes the circuit function and shows the schematic for the
EVM.
Topic Page
3.1 Circuit Function 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2 Schematic Diagram 3-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 3

Circuit Function
3-2
3.1 Circuit Function
The following paragraphs describe the function of the individual circuits. See
the data sheet for device operating characteristics.
3.1.1 Analog Inputs
TheADC has either transformer-coupledinputsordifferential-amplifierinputs
from a single-ended source. The inputs are provided via the SMA connectors
J1 and J2 on the EVM, which must be configured as follows:
-For a differential amplifier input to the ADC, a single ended source is
connected to J1. R36 and R38 must be installed, and R37 and R39 must
be removed. The input has a 50-Ωterminator.
-For a 1:1 transformer coupled input to the ADC, a single ended source is
connected to J2. R36 and R38 must be removed, and R37 and R39 must
be installed. The input is ac-coupled and has a 50-Ωterminator.
3.1.2 External Reference Inputs
In addition to being able to use the internal reference of the ADC, a reference
circuit has been included on the EVM. This circuit uses a precision 2.5-V,
low-noiselinearregulator as the primary source,andallowsadjustmentofthe
REFT and REFB signals to the ADC using potentiometers R27 and R28,
respectively. A third source, CML, is also generated to provide an adjustable
commonmodevoltagetobeusedbythe transformer and differentialamplifier
during external reference operation. CML is adjusted by potentiometer R29.
In order to use the ADC with external references, install jumpers W10 and
W11, install jumper W3 between pins 2 and 3, jumper W6 between pins 1
and 2,andjumperW1betweenpins1and2.IfREFTissettoanyvoltageother
than1.25V,jumperW1mustbeinstalledbetweenpins2and3foroptimalADC
performance. The ranges of the external reference signals are shown in
Table 3–1.
Table 3–1.Reference Voltage Adjustment Ranges
Signal Minimum Voltage Typical Voltage Maximum Voltage
REFT 0.9 1.25 1.6
REFB 0.3 0.75 0.9
CML 0.5 1.0 1.25