Texas Instruments ADS5263EVM Manual de usuario

User's Guide

SLAU344–May 2011

ADS5263EVM Evaluation Module

This user’s guide gives an overview of the ADS5263EVM and describes how the evaluation module can

be used to evaluate the performance, functions, and features of the ADS5263 device.

Contents

1 Quick Look at the Evaluation Setup ...................................................................................... 2

2 EVM Circuit Description .................................................................................................... 3

2.1 Power ................................................................................................................ 3

2.2 Clock Input .......................................................................................................... 3

2.3 Analog Input ........................................................................................................ 4

2.4 Onboard Band-Pass Filter in THS Path ......................................................................... 5

3 ADS5263EVM GUI ......................................................................................................... 6

3.1 Installing the EVM GUI ............................................................................................ 6

3.2 GUI Features ....................................................................................................... 8

4 TSW1250 GUI ............................................................................................................. 10

4.1 Verify the Setup ................................................................................................... 10

4.2 Verify the Ramp Test Pattern ................................................................................... 13

4.3 Verify With a Sine Wave Analog Input ......................................................................... 15

5 ADS5263EVM Schematics and Test Points ........................................................................... 17

5.1 List of Test Points ................................................................................................ 17

6 ADS5263EVM PCB Layout .............................................................................................. 17

7 Bill of Materials ............................................................................................................. 24

List of Figures

1 Evaluation Setup............................................................................................................ 2

2 AD5263 Sine Wave Clocking Using Transformer ...................................................................... 3

3 ADS5263 Clocking Using a LVPECL Buffer............................................................................. 4

4 Input Drive Circuit –Using Transformers................................................................................ 4

5 Input Drive Circuit –Using THS770006 Amplifier ...................................................................... 5

6 Band-Pass Filter ............................................................................................................ 6

7 ADS5263 GUI ............................................................................................................... 9

8 ADS5263 GUI.............................................................................................................. 10

9 EVM and TSW Card Connections....................................................................................... 11

10 Initializing the ADS5263GUI ............................................................................................. 12

11 Successful Interface Between TSW Card and Computer............................................................ 13

12 Enabling Ramp Test Pattern in the ADS5263 GUI ................................................................... 14

13 Verifying With Ramp Test Pattern....................................................................................... 15

14 Sine Wave Data Capture................................................................................................. 16

15 Spectrum of Captured Data.............................................................................................. 17

16 ADS5263EVM Top Layer Assembly Drawing –Top View........................................................... 18

17 ADS5263EVM Bottom Layer Assembly Drawing –Bottom View ................................................... 19

18 ADS5263EVM Top Layer Copper –Top View ........................................................................ 20

19 ADS5263EVM Internal Layer 1, Ground –Top View................................................................. 21

20 ADS5263EVM Internal Layer 2, Power –Top View .................................................................. 22

SLAU344–May 2011 ADS5263EVM Evaluation Module

Quick Look at the Evaluation Setup

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21 ADS5263EVM Bottom Layer Copper –Top View..................................................................... 23

List of Tables

1 Two-Input Configurations .................................................................................................. 5

2 SMT Resistors............................................................................................................... 5

3 Test Points on the EVM .................................................................................................. 17

4 EVM Components List.................................................................................................... 24

1 Quick Look at the Evaluation Setup

Figure 1 shows an overview of the evaluation setup that includes the ADS5263EVM evaluation module

(EVM), TSW1250 capture card, external equipment, and software requirements.

Figure 1. Evaluation Setup

TSW1250 Capture Card: The high-speed LVDS deserializer card is required for capturing data from the

ADS5263EVM and its analysis using the TSW1250 graphical user interface (GUI).

For information pertaining to the TSW1250 card, see

http://focus.ti.com/docs/toolsw/folders/print/tsw1250evm.html.

Equipment: Signal generators (with low-phase noise) must be used as source of input signal and clock in

order to get the desired performance. Additionally, band-pass filters are required in both the signal and

clock paths to attenuate the harmonics and noise from the generators.

Power Supply: A single 5-V supply powers the EVM . The supplies for the ADS5263 device are derived

from the 5-V supply. The power supply must be able to source up to 1.5 A. A 6-V supply can power the

TSW1250 card using a laptop-style adapter.

USB Interface to PC: The USB connection from the ADS5263EVM and TSW1250 card to the personal

computer (PC) must be set up; Step 3 in Section 3.1 explains the USB driver installation.

ADS5263EVM GUI: Section 3.1 explains the GUI installation procedure and its operation.

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EVM Circuit Description

2 EVM Circuit Description

The complete schematic of the EVM can be found at the end of this user guide. Critical portions of the

EVM are explained in the following text.

2.1 Power

The EVM requires a single 5-V supply for operation that can be supplied through banana jacks. Separate

LDOs convert the 5-V input to generate the 3.3-V AVDD supply and the 1.8-V LVDD supply required for

the ADS5263 operation.

2.2 Clock Input

The clock can be supplied to the analog-to-digital converter (ADC) in one of two ways. The default

factory-configured option supplies a single-ended sine wave clock directly to the SMA connecter J31. This

clock is converted to differential by the TC4-1W transformer from MiniCircuits and is ac coupled to the

ADC. This transformer has an impedance ratio of 4, so the voltage applied on J31 is stepped up by a

factor of 2.

The clock input must be from a clean, low-jitter source (such as SMA100A or 8644B) and filtered by a

narrow band-pass filter. Taking into account the attenuation of the filter, the clock amplitude must be set

appropriately to get about 1.5-V peak-to-peak at the clock pins of the ADS5263.

The clock source is commonly synchronized with the signal generator of the input frequency to keep the

clock and input coherent for meaningful FFT analysis.

Figure 2. AD5263 Sine Wave Clocking Using Transformer

LVPECL Clock Option

Alternately, the clock may be supplied by an onboard LVPECL clock buffer (TI’s CDCLVP1102). To use

this option,

•Remove the coupling capacitors C59, C61.

•Replace the 0-Ωresistors with 0.1-µF capacitors.

•Apply a single-ended, square-wave clock signal on SMA connector J33.

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EVM Circuit Description

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Figure 3. ADS5263 Clocking Using a LVPECL Buffer

2.3 Analog Input

The ADS5263 can be used as a quad-channel, 16-bit ADC or as a quad-channel, 14-bit ADC. Each

channel can be configured to use either a transformer-coupled input or a TH77006 amplifier input, from a

single-ended source. As a result, two input configurations exist detailed in Table 1.

Figure 4. Input Drive Circuit –Using Transformers

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EVM Circuit Description

Figure 5. Input Drive Circuit –Using THS770006 Amplifier

Table 1. Two-Input Configurations

EVM Transformer Drive THS770006 Drive Description

Config

1 On channels 1, 2, 3, 4 On channel 3 ●All components in the transformer drive path for all four

channels are available in the EVM.

●All components in the THS path for only channel 3 is available

in the EVM.

2 On channels 1, 2, 3, 4 On channels 1, 2, 3, ●All components in the transformer and THS paths for all four

4 channels are available in the EVM.

Note that the 16-bit ADC and the 14-bit ADC have different analog input pins. Analog input pins 1A, 2A,

3A, 4A correspond to the 16-bit ADC inputs while 1B, 2B, 3B, 4B correspond to the 14-bit ADC inputs.

Each of the four transformer paths can be configured to drive either the 16-bit or 14-bit ADC inputs.

Similarly, each of the four THS paths can be configured to drive either the 16-bit or 14-bit ADC inputs.

This configuration is achieved using pairs of 0 ΩSMT resistors, as listed in Table 2.

Table 2. SMT Resistors

Chan 1A Chan 1B Chan 2A Chan 2B

Drive Type 16-Bit ADC 14-Bit ADC 16-Bit ADC 14-Bit ADC

R80,R81 = Open R98, R99 = Open

R169, R170 = Open R171, R172 = Open

Transformer R169,R170 = 0 ΩR171, R172 = 0 Ω

R35, R153 = 0 ΩR154, R155 = 0 Ω

R35, R153 =Open R154, R155 = Open

R80, R81 = 0 ΩR98, R99 = 0 Ω

THS770006 This option is not supported This option is not supported

R169, R170 = Open R171, R172 = Open

Chan 3A Chan 3B Chan 4A Chan 4B

Drive Type 16-Bit ADC 14-Bit ADC 16-Bit ADC 14-Bit ADC

R138,R139 = Open R125, R126 = Open

R173, R174 = Open R175, R176 = Open

Transformer R173, R174 = 0 ΩR175, R176 = 0 Ω

R165, R166 = 0 ΩR167, R168 = 0 Ω

R165, R166 = Open R167, R168 = Open

R138, R139 = 0 ΩR125, R126 = 0 Ω

THS770006 This option is not supported This option is not supported

R173, R174 = Open R175, R176 = Open

2.4 Onboard Band-Pass Filter in THS Path

A provision exists in the EVM to include a band-pass filter in the analog input between the THS770006

amplifier and the ADS5263 input pins. Component placeholders are provided to support up to sixth-order

LC band-pass filter on each of the four channels. This allows users to design their own filters, populate the

EVM with the corresponding components, and verify the performance on the EVM itself.

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Figure 6. Band-Pass Filter

3 ADS5263EVM GUI

This section describes the software features accompanying the EVM kit. The ADS5263EVM control

software allows users to write to the ADC registers found in the data sheet.

3.1 Installing the EVM GUI

The EVM comes with a software installation CD that includes an installer zip file for the GUI and

associated USB driver.

Step 1 –Install the software before plugging in the USB cable for the first time.

•Unzip the installer file, and run the setup.exe file

Step 2 –Connect the USB cable from the PC to the EVM.

•If the USB driver has not been previously installed in the PC, then a Windows™message Found New

Hardware appears. Proceed to Step 3 to complete the installation.

•If the message does not appear, then skip Step 3

Step 3 –Completing the USB Driver Installation

•In the Found New Hardware message, select No, not this time from the options, and press the Next

button

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ADS5263EVM GUI

•Select Install from a list or specific location (Advanced) as shown in the following illustration, and then

click Next.

•Select Search for the best driver in these locations., and enter the file path C:\Program Files\Texas

Instruments\CDM 2.04.06 WHQL Certified in the combo-box, or browse to it by clicking the Browse

button. Once the file path has been entered in the box, click Next to proceed.

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•

Windows XP can be configured to warn when unsigned (non-WHQL certified) drivers are about to be

installed. In that case, the following screen is displayed. Click on Continue Anyway to continue with the

installation.

•If Windows XP is configured to ignore file signature warnings, no message appears.

3.2 GUI Features

Once it is launched, the ADS5263 GUI comes up in the state shown in the following illustration. The

ADS5263 has many programmable registers to control various modes. In the GUI, registers with similar

functions are grouped into separate tabs such as:

•Top-level

•Interface

•Dig Sig Proc

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ADS5263EVM GUI

Figure 7. ADS5263 GUI

Additionally, the GUI has a couple of interesting features –debug mode and command sequence. The

debug mode is an alternate way of controlling the registers in the device by directly specifying the

hexadecimal values for the register address and register data.

The command sequence can be used to record and store a sequence of register writes into a text file. The

next time, after a device reset, the text file can be simply played back. The GUI configures the device with

the registers stored in the text file.

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Figure 8. ADS5263 GUI

4 TSW1250 GUI

The TSW1250 GUI is required to transfer ADC data from the TSW1250 card. The data can be viewed in

the time-domain. The spectrum of the captured data can be viewed in the Single Tone FFT tab.

For installation of the TSW GUI, see TSW1250EVM: High-Speed LVDS Deserializer and Analysis System

user's guide (SLOU260).

If the PC is already pre-installed with TSW1250, it may be an earlier revision that does not support the

ADS5263 device. Follow the steps outlined in the relevant section of the TSW1250EVM user's guide to

first uninstall and then re-install the latest TSW1250 version.

4.1 Verify the Setup

Perform the following steps before launching the TSW1250 GUI:

•Connect the TSW1250 card to the ADS5263EVM.

•Connect the power supplies to both cards and power up.

•Connect the USB cables from the PC to the ADS EVM and TSW card.

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