Texas Instruments TLC5540 User manual

TLC5540/TLC5510/TLC5510A
Evaluation Module
July 2002 Mixed-Signal Products
User’s Guide
SLAU007D

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Information About Cautions and Warnings
iii
Read This First
Preface
Read This First
About This Manual
This user’s guide serves as a reference book for the TLC5540/
TLC5510/TLC5510A.Thisdocumentprovidesinformationtoassistmanagers
and hardware/software engineers in application development.
How to Use This Manual
This document contains the following chapters:
- Chapter 1 Overview
- Chapter 2 Circuit Description
- Chapter 3 Physical 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.

Related Documentation From Texas Instruments
iv
Related Documentation From Texas Instruments
ThefollowingdocumentsmaybeorderedbycontactingtheTexasInstruments
Product Information Center at one of the numbers listed on the next page, or,
they may be downloaded at:
http://www–s.ti.com/sc/docs/psheets/pids2.htm
TLC5510/TLC5510A Data Sheet (literature number SLAS095) contains
electrical specifications, available temperature options, general over-
view of the device, and application information.
TLC5540 Data Sheet (literature number SLAS105) contains electrical
specifications, available temperature options, general overview of the
device, and application information.
CE/FCC Warnings
Thisequipmentisintendedforuseinalaboratorytestenvironmentonly.Itgen-
erates,uses,andcanradiateradiofrequencyenergyandhasnotbeentested
for compliance with the limits of computing devices pursuant to subpart J of
part 15 of FCC rules. This device has been tested and found to comply with
the limits for a CISPRII Group 1 and the following directives: EMC Directive
89/336/EEC amending directive 92/31/EEC and 93/68/EEC as per
ENV50204:1995, EN55011: 1995 Class A, EN61000–4–4: 1995, and
EN6100–4–3: 1993. 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.

Running Title—Attribute Reference
v
Chapter Title—Attribute Reference
Contents
1 Overview 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.1 Purpose 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.2 Power Supply Requirements 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2 Circuit Description 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.1 EVM Analog Input 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.1.1 Direct Input 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.1.2 Amplifier Input, DC-Coupled 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.1.3 Amplifier Input, AC-Coupled 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.1.4 Input Bias Operational Range 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.1.5 Test Points 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.1.6 User Supplied Input Circuit 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2 Digital Output 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.3 Clock Circuit 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.4 Board Schematic 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3 Physical Description 3-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.1 Board Layout 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2 Board Layers 3-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.3 Part Descriptions 3-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Running Title—Attribute Reference
vi
Figures
2–1 Board Schematic 2-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3–1 EVM Board Layout 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3–2 EVM Board Layer 1 3-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3–3 EVM Board Layer 2 3-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3–4 EVM Board Layer 3 3-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3–5 EVM Board Layer 4 3-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tables
1–1 Power Supplies 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2–1 Amplifier Input Coupling 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2–2 Input Voltage Setting 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2–3 Test Points 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3–1 Part Descriptions 3-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-1
Overview
Overview
This chapter gives an overview of the TLC5540/TLC5510/TLC5510A
evaluation module (EVM).
Topic Page
1.1 Power Supply Requirements 1–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.2 Power Supply Requirements 1–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 1

Purpose
1-2
1.1 Purpose
TheTLC5540/TLC5510/TLC5510Aevaluationmodule(EVM)providesaplat-
form for lab prototype evaluation of the Texas Instruments TLC5540/
TLC5510/TLC5510A 8-bit, high-speed analog-to-digital converters.
Since practical operation can be acheived with a clock speed in excess of
40 MHz, the circuit layout is critical and does not lend itself to classic
breadboarding techniques. In fact, proper operation requires use of surface-
mount components.
1.2 Power Supply Requirements
The TLC5540/TLC5510/TLC5510A EVM is designed to be powered by
regulated lab power supplies. Three lab supplies are required for the best
performance.
Table 1–1.Power Supplies
If Amp Used By-pass Amp
Connector Supply TLC5540/5510/
5510A TLC5510/ 5540/5510A
J2 Positive analog supply 5 V ±10% 5 V ±10%
J3 Negative analog supply –5 V ±10% N/A
J8 Digital supply 5 V ±10% 5 V ±10%
The 5 V and –5 V analog supplies share an analog ground plane. The digital
supply uses an isolated ground plane.
The two ground planes can be easily connected by soldering jumpers from
E21 to E22 or from E13 to E14. This allows the user to adapt the EVM to
various grounding conditions that can exist in an evaluation circuit interface.

2-1
Circuit Description
Circuit Description
This chapter describes the EVM circuit and its operation.
Topic Page
2.1 EVM Analog Input 2–2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2 Digital Output 2–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.3 Clock Circuit 2–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.4 Board Schematic 2–4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 2

EVM Analog Input
2-2
2.1 EVM Analog Input
The EVM analog input signal is applied to BNC connector J4 by one of four
methods:
- Direct
- Amplifier input (dc-coupled)
- Amplifier input (ac-coupled)
- User supplied input
2.1.1 Direct Input
To route the signal directly to the TLC5540/TLC5510/TLC5510A input, solder
jumpers from E7 to E8 and from E23 to E12. This provides a 50-Ωload (R5)
atinputconnectorJ4.Theinputsignalmustbedc-biasedtothespecifications
defined by the data sheet. The TLC5540/TLC5510/TLC5510A is connected
using its internal bias resistors. Jumper J6 bypasses one of the internal bias
resistorsandthusalterstheinputbiasrangerequiredbytheinputsignal. With
J6 installed, the voltage range of the TLC5540/TLC5510 is 0 V to 2.28 V (at
3.3 VDDA).
The TLC5510A uses only the center internal bias resistor with an externally-
applied regulated 4-V reference to generate the device reference voltage.
Hence the input signal range applied to J4 can be between 0 V–4 V.
The input signal is band-limited to 12 MHz by the LC filter consisting of FB5,
R15, and C5. For a bandwidth of 20 MHz, select a value for C5 in the 15 pF
to 33 pF range.
2.1.2 Amplifier Input, DC-Coupled
A THS3001 high-speed transconductance operational amplifier provides
buffering for dc-coupled amplifier-input signals. The amplifier circuit provides
a flat response to 300 MHz with a gain of two. It can drive a low impedance
load.
The values of R6 and R8 set the amplifier gain to two.
The gain can be reduced to one by removing R6. Since the inverting input is
a low-impedance current-controlled input, R8 must remain in the circuit, and
its value must be changed to 1 kΩ. This resistance value is critical because it
controls the high frequency response of the circuit. The TLC5510A amplifier
gain is set to one.
The output rolloff filter, consisting of R4 and C14, provides a small amount of
filtering against frequencies in excess of 20 MHz (fs/2). The value of C14 can
bealtered to change thefilter characteristics, or C14can be removed entirely.
Inmostcases,R4shouldbe retained to lowerthedirectcapacitiveloadonthe
operational amplifier, thereby avoiding high frequency peaking of the output
signal.
Resistor R7 also provides isolation against a direct capacitive load (such as
a scope probe) on the test point terminal.