Texas Instruments TLV2553EVM-PDK User manual

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TLV2553EVM-PDK Evaluation Module
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TLV2553EVM-PDK Evaluation Module
This user's guide describes the characteristics, operation, and use of the TLV2553EVM performance
demonstration kit (PDK). This kit is an evaluation platform for the TLV2553, which is a 12-bit, 200-kSPS,
successive approximation register (SAR), analog-to-digital converter (ADC) that features an 11-channel
analog input multiplexer and a serial SPI™ digital output interface. The EVM eases the evaluation of the
TLV2553 device with hardware and software for computer connectivity through the universal serial bus
(USB) interface. This user's guide includes complete circuit descriptions, schematic diagrams, and a bill of
materials.
The following related documents are available through the Texas Instruments web site at www.ti.com.
Related Documentation
Device Literature Number
TLV2553 SLAS354
OPA4322 SBOS538
OPA320 SBOS513
REF3240 SBVS058
TXB0106 SCES709
TPS7A4901 SBVS121

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Contents
1 Overview...................................................................................................................... 3
1.1 TLV2553EVM-PDK Features...................................................................................... 3
1.2 TLV2553EVM Features............................................................................................ 3
2 EVM Analog Interface....................................................................................................... 4
2.1 ADC Analog Input Signal Path.................................................................................... 4
2.2 Onboard ADC Reference.......................................................................................... 5
3 Digital Interfaces ............................................................................................................. 5
3.1 SPI for ADC Digital IO ............................................................................................. 5
4 Power Supplies .............................................................................................................. 6
5 TLV2553EVM-PDK Initial Setup........................................................................................... 6
5.1 Default Jumper Settings ........................................................................................... 6
5.2 Connectors J3 and J4.............................................................................................. 7
5.3 EVM Graphical User Interface (GUI) Software Installation.................................................... 7
6 TLV2553EVM-PDK Operation............................................................................................ 10
6.1 EVM GUI Global Settings for ADC Control .................................................................... 11
6.2 Data Capture Tool................................................................................................. 12
6.3 Histogram Tool .................................................................................................... 12
6.4 Performance (or FFT) Analysis Tool............................................................................ 14
7 Bill of Materials, PCB Layout, and Schematics......................................................................... 15
List of Figures
1 Input Signal Path Schematic (Single Channel) ......................................................................... 4
2 Onboard Reference Signal Path........................................................................................... 5
3 TLV2553EVM Default Jumper Settings................................................................................... 6
4 TLV2553 Software Installation Prompts .................................................................................. 7
5 Device Driver Installation .................................................................................................. 8
6 LabVIEW Run-Time Engine Installation .................................................................................. 9
7 TLV2553EVM-PDK Installation Final Step ............................................................................... 9
8 EVM-PDK Hardware Setup and LED Indicators ....................................................................... 10
9 Launch the EVM GUI Software........................................................................................... 10
10 EVM GUI Global Input Parameters...................................................................................... 11
11 Multichannel Acquisition and Data Export Options .................................................................... 12
12 Histogram Tool Input Channel Selection................................................................................ 13
13 FFT Tool Input Parameters ............................................................................................... 14
14 TLV2553EVM PCB Layer 1: Top Layer................................................................................. 16
15 TLV2553EVM PCB Layer 2: GND Plane ............................................................................... 16
16 TLV2553EVM PCB Layer 3: Power Planes ............................................................................ 17
17 TLV2553EVM PCB Layer 4: Bottom Layer............................................................................. 17
18 Schematic Diagram of the TLV2553EVM PCB......................................................................... 18
List of Tables
1 JP1 - JP2: Analog Interface Connections ................................................................................ 4
2 TLV2553EVM Bill of Materials ........................................................................................... 15
Trademarks
Windows is a registered trademark of Microsoft, Corp.
SPI is a trademark of Motorola Mobility LLC.
All other trademarks are the property of their respective owners.

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TLV2553EVM-PDK Evaluation Module
1 Overview
The TLV2553EVM-PDK is a platform for evaluating the performance of the TLV2553 SAR ADC. The
evaluation kit includes the TLV2553EVM board, the precision host interface (PHI) board, and
accompanying computer software that enables the user to communicate with the ADC over USB, capture
data, and perform data analysis.
The TLV2553EVM board includes the TLV2553 SAR ADC and all the peripheral circuits and components
necessary to extract good performance from the ADC.
The PHI board primarily serves three functions:
• Provides a communication interface from the EVM to the computer through a USB port.
• Provides the digital input and output signals necessary to communicate with the TLV2553EVM.
• Powers all active circuitry on the TLV2553EVM board.
Along with the TLV2553EVM and PHI controller board, this demonstration kit includes an A-to-micro-B
USB cable that is required for system setup.
1.1 TLV2553EVM-PDK Features
• Includes hardware and software required for diagnostic testing as well as accurate performance
evaluation of the TLV2553 ADC.
• No external power supply is necessary.
• Ships with the PHI controller that provides a convenient interface to the EVM over a USB 2.0 (or
higher) for power delivery as well as digital input and output.
• Easy-to-use evaluation software for all Windows®operating systems.
• The software suite includes graphical tools for multichannel data capture, output code histogram
generation, and FFT analysis, as well as a provision for exporting data to a text file for post-processing.
1.2 TLV2553EVM Features
• Onboard, precision, op-amp buffers on every analog input channel to support a high input impedance
(1 MΩ) and a low impedance ADC drive for optimal performance.
• Options for driving buffer inputs close to full-scale or 0 V using onboard dc voltage sources.
• Onboard precision voltage reference and low-impedance ADC reference drive circuit.
• Includes a +5-V low-dropout regulator (LDO) to regulate supply voltages to the ADC and drive circuits.
• Includes a 5-V to 3.3-V bidirectional digital level translator to interface with the host controller.

+5 V
Input
Signal
Source
AINx
-
++
OPA4322 50 
1 nF
1 M
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2 EVM Analog Interface
At a system level, the analog portion of the TLV2553 consists of the 11 analog input channels and the dc
reference voltage input. As with most SAR ADCs, the analog inputs of the TLV2553 are not high-
impedance ports. These inputs terminate in switched-capacitor networks that draw load current when the
switches are closed. The dynamic nature of the load currents produces dynamic errors in the
corresponding input voltage signals and ADC accuracy can degrade if these errors are not managed
carefully. Low source impedance is critical to minimizing these errors; minimizing source impedance
requires careful design of the ADC input signal paths.
2.1 ADC Analog Input Signal Path
The 11 analog input signal paths are designed so that the ADC provides accurate results even with signal
sources that have relatively high output impedance. The schematic (for one channel) is shown in Figure 1.
Figure 1. Input Signal Path Schematic (Single Channel)
The OPA4322 unity-gain buffers individually decouple the input signal source on each channel from the
ADC input load current. The buffer inputs are pulled down to GND by the 1-MΩresistors to ensure safe
and predictable operating conditions on the board even when the inputs are left floating. Of course, the
tradeoff with this approach is that the EVM analog input impedance is lower (only 1 MΩ) but the inputs
can still support a wide range of source impedances without introducing significant gain error.
The buffered ADC inputs are accessible through the even-numbered pins of J2 (that is, J2.Pin2 through
J2.Pin22). The odd-numbered pins of J2 (J2.Pin1 through J2.Pin27) are shorted together on the board
and must be jumpered to any one of the even-numbered pins marked GND (J2.Pin28), PFS (J2.Pin26), or
NFS (J2.Pin24), depending on whether the ADC inputs must be driven from an external source (such as a
function generator, sensor, and so forth) or by one of the onboard sources.
Note that J2.Pin24 and J2.Pin26 are the outputs of the onboard dc voltage sources and have nominal
values of approximately 100 mV and 4 V, respectively. These pins are useful for debugging any gross
problems with the op-amp buffers or the ADC. However, for default operation (that is, inputs are from
external sources), the odd-numbered pins of J2 must be connected to J2.Pin28 (GND). The jumper
settings for J2 are summarized in Table 1.
Table 1. JP1 - JP2: Analog Interface Connections
ADC
Input Value J2.Pin24 ↔J2.Pin23 J2.Pin26 ↔J2.Pin25 J2.Pin28 ↔J2.Pin27
External Any Open Open Closed
PFS 4 V Open Closed Open
NFS 100 mV Closed Open Open
NOTE: In addition to configuring J2 according to Table 1, install shunts at the locations
corresponding to the appropriate input channels as well.

+5 V
+5 V
REF+
REF-
OUTF
GNDF
OUTS
GNDS
IN
EN
REF3240
1 k
1 PF
-
++
OPA320
0.5 
10 PF
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2.2 Onboard ADC Reference
The EVM does not include a provision for driving the reference input of the TLV2553 from an external
source. The reference input signal path is entirely self-contained on the TLV2553EVM and consists of the
REF3240, a 4.096-V precision voltage reference whose output is heavily low-pass filtered and buffered by
the OPA320, a precision op amp that has low output impedance over a sufficiently wide frequency range.
The schematic is shown in Figure 2.
Figure 2. Onboard Reference Signal Path
The 10-µF ceramic capacitor at the output of the OPA320 provides additional load decoupling and
effectively lowers the output impedance of the reference drive circuit at high frequencies.
3 Digital Interfaces
As noted in Section 1, the EVM interfaces with the PHI that, in turn, communicates with the computer over
USB. There are two devices on the EVM with which the PHI communicates: the ADC (over SPI) and the
EEPROM (over I2C). The EEPROM comes pre-programmed with the information required to configure and
initialize the TLV2553EVM-PDK platform. When the hardware is initialized, the EEPROM is no longer
used.
3.1 SPI for ADC Digital IO
The TLV2553EVM-PDK supports all three ADC interface modes (8-, 12-, and 16-bit modes), as detailed in
the TLV2553 data sheet. MSB- or LSB-first options are also supported. An important note concerning the
TLV2553 that is not clarified in the TLV2553 datasheet is that in 16-bit, LSB-first mode the four MSBs of
the DATA OUT word are zeroes (compare this with Figure 37 of the TLV2553 datasheet).
The EVM uses a 5-V supply for powering the TLV2553, and therefore the ADC digital I/O interface
operates on 5-V logic levels. However, the PHI requires 3.3-V logic levels for proper operation, and for this
reason the EVM includes the TXB0106 (U8), a 5-V to 3.3-V bidirectional level translator.
The digital I/O lines also include 50-Ωseries resistors to minimize ringing and delay mismatches between
the SPI interface signals.

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4 Power Supplies
The PHI provides multiple power-supply options for the EVM, derived from the computer USB supply.
The EEPROM on the TLV2553EVM uses a common 3.3-V power supply and the digital level translator
uses a separate 3.3-V supply (both directly from the PHI). On the other hand, the ADC and analog input
drive circuits are powered by the TPS7A4901 onboard the EVM, which is a low-noise linear regulator that
uses the 5-V supply out of a switching regulator on the PHI to generate a much cleaner 5-V output.
The power supply for each active component on the EVM is bypassed with a ceramic capacitor placed
close to that component. Additionally, the EVM layout uses thick traces or large copper fill areas where
possible between bypass capacitors and their loads to minimize inductance along the load current path.
5 TLV2553EVM-PDK Initial Setup
This section explains the initial hardware and software setup procedure that must be completed for
properly operating the TLV2553EVM-PDK.
5.1 Default Jumper Settings
Upon unpacking, the EVM is already configured with default jumper settings. J5 must be open and J2
must have shunts installed at the locations shown in Figure 3.
Figure 3. TLV2553EVM Default Jumper Settings

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5.2 Connectors J3 and J4
J3 and J4 are for TI internal use only and are not installed by default. However, their pins can be used as
test points (that is, for meter hookups only).
CAUTION
Do not drive the J3 or J4 pins with external voltage sources. Doing so may
cause damage to the onboard sources.
5.3 EVM Graphical User Interface (GUI) Software Installation
The following steps describe how to install the software for the TLV2553 EVM graphical user interface
(GUI).
1. Download the latest version of the EVM GUI installer from the Tools and Software folder of the
TLV2553EVM-PDK, and run the GUI installer to install the EVM GUI software on your computer.
2. Accept the license agreements as shown in Figure 4 and follow the onscreen instructions to complete
the installation.
Figure 4. TLV2553 Software Installation Prompts

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3. As a part of the TLV2553EVM GUI installation, a prompt with a device driver installation wizard shown
in Figure 5 appears on the screen. Click the Next button to proceed, then click the Finish button when
the installation is complete.
Figure 5. Device Driver Installation
NOTE: A notice may appear on the screen stating that Windows cannot verify the publisher of this
driver software. Select the Install this driver anyway option.

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The device requires the LabVIEW run-time engine (Figure 6) and may prompt for the installation of this
software, if not already installed.
Figure 6. LabVIEW Run-Time Engine Installation
4. If you would like a Desktop shortcut, check the Create Desktop Shortcut box, as shown in Figure 7.
Figure 7. TLV2553EVM-PDK Installation Final Step

INSTALL
D2 D1
D5
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6 TLV2553EVM-PDK Operation
The following instructions are a step-by-step guide to connecting the TLV2553EVM-PDK to the computer
and evaluating the performance of the TLV2553:
1. Ensure that no SD card is installed in the SD card slot J6. The SD card is not required to boot up the
TLV2553EVM-PDK with the PHI.
2. Connect the TLV2553EVM to the PHI, and install the two screws, as indicated in Figure 8.
3. Use the USB cable provided to connect the PHI to the computer.
• LED D5 on the PHI lights up, indicating that the PHI is powered up.
• LEDs D1 and D2 of the PHI starts blinking to indicate that the PHI is communicating with the EVM.
The resulting LED indicators are shown in Figure 8.
Figure 8. EVM-PDK Hardware Setup and LED Indicators
4. Double-click on the TLV2553 EVM.exe file to launch the TLV2553EVM-PDK GUI software.
TheTLV2553EVM GUI software folder is shown in Figure 9.
Figure 9. Launch the EVM GUI Software