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Copyright 1999, Texas Instruments Incorporated
Page 3
About This Manual
Information About Cautions and Warnings
Preface
Read This First
The purpose of this user’s guide is to serve as a reference book for the
TLC5540/TLC5510/TLC5510A/TLV5510/TLV5540 devices. This document
provides information to assist managers 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.
Read This First
iii
Page 4
Related Documentation From Texas Instruments
Related Documentation From Texas Instruments
The following documents may be ordered by contacting the T exas Instruments
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
CE/FCC Warnings
TLC5510/TLC5510A Data Sheet
(literature number SLAS095) contains
electrical specifications, available temperature options, general overview 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.
TLV5510 Data Sheet
(literature number SLAS124) contains electrical
specifications, available temperature options, general overview of the
device, and application information.
TLV5540 Data Sheet
(literature number SLAS192) contains electrical
specifications, available temperature options, general overview of the
device, and application information.
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 tested
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.
The TLC5540/TLC5510/TLC5510A/TLV5540/TLV5510 evaluation module
(EVM) provides a platform for lab prototype evaluation of the Texas Instruments TLC5540/TLC5510/TLC5510A/TLV5540/TLV5510 8-bit, high-speed
analog-to-digital converters.
Since practical operation can be acheived 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
Overview
Page 9
Power Supply Requirements
1.2Power Supply Requirements
The TLC5540/TLC5510/TLC5510A/TLV5540/TLV5510 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 UsedBy-pass Amp
ConnectorSupply
J2Positive analog supply5 V ±10%3.6 V MIN5 V ±10%3.6 V – 2.7 V
J3Negative analog supply–5 V ±10%–3.6 MINN/AN/A
J8Digital supply5 V ±10%3.6 V – 3.3 V5 V ±10%3.6 V – 2.7 V
TLC5540/5510/
5510A
TL V5540/5510
The 5 V/3.6 V and –5 V/–3.6 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.
TLC5510/
5540/5510A
TL V5510/5540
Overview
1-3
Page 10
1-4
Overview
Page 11
Chapter 2
Circuit
Description
This chapter describes the EVM circuit and its operation.
The EVM analog input signal is applied to BNC connector J4 by one of four
methods:
-
-
-
-
2.1.1Direct Input
To route the signal directly to the TLC5540/TLC5510/TLC5510A/
TL V5540/TLV5510 input, solder jumpers from E7 to E8 and from E23 to E12.
This provides a 50-Ohm load (R5) at input connector J4. The input signal must
be dc biased to the specifications defined by the data sheet. The
TLC5540/TLC5510/TLC5510A/TLV5540/TLV5510 is connected using its internal bias resistors. Jumper J6 bypasses one of the internal bias resistors and
thus alters the input bias range required by the input signal. With J6 installed,
the voltage range of the TLC5540/TLC5510 is 0 V – 2.28 V and
TLV5540/TLV5510 is 0 V – 2.74 V (at 3.3 V
Direct
Amplifier input (dc coupled)
Amplifier input (ac coupled)
User supplied input
DDA
).
The TLC5510A uses only the center internal bias resistor with an externallyapplied 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 bandlimited 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.
2-2
Circuit Description
Page 13
2.1.2Amplifier 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 roll-off filter , consisting of R4 and C14, provides a small amount of
filtering against frequencies in excess of 20 MHz (f
be altered to change the filter characteristics, or C14 can be removed entirely .
In most cases, R4 should be retained to lower the direct capacitive load on the
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.
EVM Analog Input
/2). The value of C14 can
s
The amplifier output circuit is connected to the TLC5540/TLC5510/
TLC5510A/TLV5540/TLV5510 by soldering a jumper between terminals E10
and E12.
The amplifier input can be either dc coupled or ac coupled to the input.
T able 2–1 shows the jumpers required to select either input coupling method.
Table 2–1.Amplifier Input Coupling
CouplingJumper Terminals
dcE3 to E4
acE1 to E2
2.1.3Amplifier Input, AC Coupled
Potentiometer R2 controls the dc input bias for amplifier ac-coupled inputs.
This allows the bias to be varied from near ground to near 5 V/3.6 V (analog).
With an amplifier gain of two, the output approaches the positive power supply
when the bias potentiometer approaches 2.5 V for the TLC5510/TLC5560 and
1.8 V for the TLV5510/TLV5540.
For a 4-V input and a gain of 1 (R6 removed and R8 set to 1 kΩ for optimum
settling time and minimum ringing) bias potentiometer R2 is adjusted such that
E1 is at 2 V and the amplifier output swing is 0 V to 4 V at TP2. With an amplifier
supply voltage of +5 V the output positive peak will be distorted slightly; therefore, it is necessary to adjust the 5-V supply to 5.56 V in order to prevent clipping of the amplifier output voltage.
Circuit Description
2-3
Page 14
EVM Analog Input
The low frequency response pole is dominated by the 4.7-µF capacitor (C6)
and the resistance setting of the potentiometer.
2.1.4Input Bias Operational Range
Jumper J6 determines the signal input range (0 to full scale) at the analog input
of the TLC5540/TLC5510/TLC5510A/TLV5570/TLV5540. Table 2–2 shows
the effects of J6.
Table 2–2.Input Voltage Setting
2.1.5Test Points
Table 2–3.Test Points
TLC5540/TLC5510
Jumper J6
Removed0.6 V to 2.6 V0.66 V to 2.87 V
Installed0 V to 2.28 V0 V to 2.74 V
Input Voltage
Range
@ 5 V
DDA
TLV5540/TLV5510
Input Voltage
Range
@ 3.3 V
DDA
TLC5510A
Input V oltage Range
@ 5 V
DDA
0 V to 4 V (J11 and J16
installed)
0 V to 4 V (J11 and J16
installed)
Other output ranges can be configured. See the TLC5540/TLC5510/
TLC5510A/TLV5540/TLV5510 data sheets.
Test points TP1 and TP2 provide an oscilloscope connection to monitor the
output of the analog input conditioning amplifier stage as follows:
Test PointConnection
TP1Analog ground
TP2Analog output of THS3001
2.1.6User Supplied Input Circuit
A breadboarding area allows the use of custom input filters or other signal
conditioning circuits. To route the input signal to the breadboarding area
(terminal E24), solder a jumper between terminals E5 and E6.
To route the signal from the breadboard area (terminal E25) to the
TLC5540/TLC5510/TLC5510A/TLV5540/TLV5510 input, solder a jumper
between terminals E11 and E12.
Only one of the above configurations should be used at one time to prevent
excessive capacitance on the signal path. This excessive capacitance can degrade the input signal quality at high frequencies.
2-4
Circuit Description
Page 15
2.2Digital Output
Digital Output
An octal high-speed latch (U4) provides buffered digital data. The factory configuration uses this latch as a buffer to drive the 22-ohm line damping resistors.
Pin 24 on the output connector (J5) can be used to drive the U4 output to a high
impedance (3-state) allowing a bus interface to external circuitry . T o do so, the
jumper between terminals E17 and E18 must be removed to remove the
ground connection. Logic 1 applied to J5 pin 24 makes the latch output a
3-state output.
This latch can be transparent by using external circuitry to drive the strobe
input (pin 1 1). The jumper at E19 and E20 must be removed and the external
drive be connected to E19. A logic 0 on this input captures and holds the input
data on the output. A logic 1 allows the outputs to follow the inputs.
Circuit Description
2-5
Page 16
Clock Circuit
2.3Clock Circuit
An external clock of up to 40 MHz is required for operation. The clock source
is required to drive the 50-ohm BNC input J1. If the clock signal comes from
a DSP or microcontroller, resistor R1 should be removed from the circuit. The
clock is buffered by inverters (U1) and provides a true (noninverted) output to
the TLC5540/TLC5510/TLC5510A/TLV5540/TLV5510 and a true equivalent
output at pin 22 of the output connector J5. This provides the user a buffered
reference clock output for external circuitry.