Texas Instruments ADS5263EVM User manual

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
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Quick Look at the Evaluation Setup www.ti.com
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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www.ti.com 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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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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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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ADS5263EVM GUI www.ti.com
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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•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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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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TSW1250 GUI www.ti.com
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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Figure 9. EVM and TSW Card Connections
•Launch the ADS5263GUI, and initialize the device
–First, reset the device by clicking the Self-reset button (this is a self-clearing bit that resets the
device and clears itself to zero)
–Put device in 2-wire, …modes
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Figure 10. Initializing the ADS5263GUI
•Apply input clock signal to SMA connector J31.
•The device is now ready for data capture by the TSW card.
–Check the DCM LED on the TSW card –it must be flashing. This indicates that the TSW card is
able to correctly detect the bit clock output from the ADS EVM.
•Launch the TSW GUI; at this point, the TSW GUI communicates with the EVM and once proper
communication is established, a message is displayed at the bottom left of the GUI.
•This completes the setup verification.
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Figure 11. Successful Interface Between TSW Card and Computer
4.2 Verify the Ramp Test Pattern
•Initialize the TSW GUI with the following settings.
–Select the device.
–Choose the channel.
–Enter the ADC sample rate. For example, 100M for 100-MSPS sample rate.
•Using the ADS5263 GUI, enable the Ramp Test Pattern mode
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Figure 12. Enabling Ramp Test Pattern in the ADS5263 GUI
•Press the Capture button in the TSW GUI.
•Time Domain:
–Select the Time Domain tab in the GUI.
–Uncheck the overlay unwrap waveform button.
–Graph shows the captured time domain data.
It Must be a clean digital ramp that increases from code 0to code 65535 from one sample to the
next. Note that the starting code in the capture graph is not fixed and can be anywhere from 0 to
65535.
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Figure 13. Verifying With Ramp Test Pattern
•Now, disable the Ramp Test Pattern in the ADS5263 GUI.
•This completes the verification of the ramp test pattern.
4.3 Verify With a Sine Wave Analog Input
•Note that for all performance evaluation, low-phase noise signal generators are required (see Figure 1)
for both analog signal and sampling clock inputs.
•In the TSW GUI,
–Enter the ADC input frequency being applied. For example, 3M for 3-MHz input frequency.
–choose the desired channel
•Set the frequency in the signal generator to the value displayed in the field ADC Input Coherent
frequency and connect the generator output to the desired channel.
This makes the input signal coherent with respect to the sampling clock, which is required for FFT
analysis.
•Now, press the Capture button, and check the overlay unwrap waveform button.
•The time domain graph shows the captured sine wave data.
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Figure 14. Sine Wave Data Capture
•Frequency Domain:
–Select the Single tone FFT tab in the GUI.
–The fft graph shows the spectrum of the captured sine wave data
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Figure 15. Spectrum of Captured Data
5 ADS5263EVM Schematics and Test Points
The schematics for the ADS5263EVM evaluation module are attached at the end of this document.
5.1 List of Test Points
Table 3. Test Points on the EVM
Test Points Name Description
TP1 SDOUT Serial register output
TP2 Ground Board ground
TP9 VCM 1.5V common-mode output
TP12 SDATA Serial interface data input
TP13 SCLK Serial interface clock input
TP14 CSZ Serial interface enable input
TP15 ADCRESETZ Reset input
TP16 PD Power down control input
6 ADS5263EVM PCB Layout
The following figures (Figure 16 through Figure 21) show the design of the ADS5263EVM printed-circuit
board. PCB dimensions: L x W = 5 x 6 inches, four layers and 0.5-oz copper on outer layers and 1oz
copper on inner layers.
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Figure 16. ADS5263EVM Top Layer Assembly Drawing –Top View
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Figure 17. ADS5263EVM Bottom Layer Assembly Drawing –Bottom View
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Figure 18. ADS5263EVM Top Layer Copper –Top View
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