National Semiconductor ADS42B4 Series User manual

User's Guide
SLAU477A–December 2012–Revised January 2015
ADS42B4x EVM
This is the user’s guide for the ADS42B4x EVM (Revision A). The ADS42B49 (dual-channel, 14-bit, up to
250 MSPS) is a dual analog-to-digital converter family. This EVM is specifically suited for interfacing with
TI’s TSW1400 EVM to capture and display waveforms from the ADC. The EVM schematic, Bill of
Materials (BOM), and layout files are found in the design package in the ADS42B4x EVM product folder
on www.ti.com.
Contents
1 Software Control ............................................................................................................. 2
2 Basic Test Procedure ....................................................................................................... 4
3 Optional Configurations.................................................................................................... 10
List of Figures
1 ADS42Bxx_GUI Front Panel – Top Level ............................................................................... 3
2 ADS42B4xEVM and TSW1400 ............................................................................................ 4
3 Test Set-Up Block Diagram ................................................................................................ 5
4 High Speed Data Converter Pro........................................................................................... 7
5 ADS42Bxx GUI............................................................................................................... 8
6 FFT Plot: 250-MHz clock, 170-MHz Input to Channel A ............................................................... 9
7 FFT Plot: 250-MHz clock, 170-MHz Input to Channel B ............................................................... 9
List of Tables
1 Default ADS42Bxx EVM Revision A Jumper Setting for Serial Interface ............................................ 5
2 Parallel Interface with Pin Control of ADS58C28 and ADS42Bxx EVM Revision B Jumper Setting ............. 6
3 Jumper Setting for Transformer-coupled or OPA-driven Input ...................................................... 10
4 Jumper Setting for Transformer-Coupled or CDCE72010 Input .................................................... 11
5 Jumper and Component Settings for DDR LVDS Output and Parallel CMOS Output............................ 11
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Software Control www.ti.com
1 Software Control
1.1 Installation Instructions
• Open folder named: ADS42Bxx_Installer_vxpx (where xpx represents the latest version)
• Double-click: setup.exe
• Follow on-screen instructions to complete GUI installation
– Wait for ADS42Bxx_Installer initializing screen to complete
– Click Next to install files in the default destination directory
– Select I accept the License Agreement and click Next
– Select Next on the summary page
– Wait for files to load and then click Next
– Once all files are installed, click Next
• If Windows®Logo Message window appears, click Continue Anyway.
• Once installed, launch by clicking on the ADS42Bxx_GUI_vxpx program in Start→Texas Instruments
ADCs
• When plugging in the USB cable for the first time, you are prompted to install the USB drivers
– On the Welcome to the Found New Hardware Wizard window select No, not at this time
– Select Install the software automatically button on the next window
– Select Continue Anyway on the Windows Logo Message window
– If the computer cannot find the drivers automatically, access them directly in the install directory:
C:\Program Files (x86)\Texas Instruments ADCs\ADS42Bxx GUI
– Click Finish once completed
1.2 Software Operation
The software allows full programming control of the ADC device. Figure 1 shows the GUI front panel that
has register tabs. The GUI tab provides an interface to the most-used registers.
1.2.1 Top Level
Figure 1 shows the top level tab of the register user interface. Below is a brief explanation of the controls.
Please refer to the ADS42B49 datasheet for more detailed explanations of the register functions as
needed.
●Reset: Device reset, clicking this switch resets the device
●Powerdown Global: Clicking the Device power down switch on powers down the device
●Data format: Clicking the Device output data format, sets the 2’s complement or
offset binary format. High Speed Data Converter Pro expects offset
binary.
●Output Buffer Selection: Select this box for LVDS or CMOS output format
●Gain ChA: Set this box for gain of channel A. Must enable digital functions first.
●Gain ChB: Set this box for gain of channel B. Must enable digital functions first.
●Test Pattern ChA: Select device test pattern for channel A. Must enable digital functions
first.
●Test Pattern ChB: Select device test pattern for channel B. Must enable digital functions
first.
●HP[0] High-performance mode bit 0 - set for CMOS outputs
●HP[1:11] High-performance mode bits 1 to 11. Always set this control.
●Digital Function Enable Set this bit to control digital functions, such as gain and test patterns.
●Low Speed Mode En: Low-Speed Mode Enable or Disable
●Low Speed Mode ChA: Low-speed mode for channel A
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●Low Speed Mode ChB: Low-speed mode for channel B
●LVDS Data Strength: Set the data strength from this switch
●LVDS Clkout Strength: Set the output clock strength from this switch
●CMOS Clk Strength: Set CMOS output clock strength from this switch
●ClkOut Delay: Programming the delay of CLKOUT
●Offset Correction: Enables or Disables offset correction
●ChA Offset Pedestal: Programming Channel A for different offset pedestals
●ChB Offset Pedestal: Programming Channel B for different offset pedestals
Figure 1. ADS42Bxx_GUI Front Panel – Top Level
1.2.2 Register Control
●Send All: Sends all the register configurations on the panel to the device
●Read All: Not active
●Save: Saves the register configuration to text file
●Load: Loads a register file from a text file. After loading registers, the relative switches and
selecting boxes are automatically updated.
— Select Load button
— Double click on the desired register file
— Click Send All to ensure all of the values are loaded properly
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1.2.3 Miscellaneous Settings
●Reset USB: Toggle this button if the USB port is not responding. This generates a new USB
handle address. After hitting this, USB Status has to be turned to “Green”.
●Exit: Stops the program
2 Basic Test Procedure
This section outlines the basic test procedure for testing the EVM. Figure 2 shows how to connect the
ADS42B4xEVM to TSW1400.
Figure 2. ADS42B4xEVM and TSW1400
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ADS42B49EVMTSW1400
LVDS
CLK
+5V
Mini-USB
PC
Signal
Generator
+5V
Mini-USB
J17
J23
J19
J3/J6
J5
J12
J4 J8
RX IF
BPF Signal
Generator
±1dBFS
15dBm
Ref_out
Ref_in
www.ti.com Basic Test Procedure
2.1 Test Block Diagram
The test set-up for general testing of the ADS42B4x EVM with the TSW1400 capture card is shown in
Figure 3.
Figure 3. Test Set-Up Block Diagram
2.2 Verify Board Set-up
Verify jumper settings are in the correct position as outlined in Table 1 and Table 2. Parallel configuration
is not recommended because the high performance modes cannot be enabled. The high performance
modes are required to achieve best performance.
Table 1. Default ADS42Bxx EVM Revision A Jumper Setting for Serial Interface
Jumper Default position Function
JP15 Short 1 - 2 DC supply for +1.8VA
JP16 Short 1 - 2 DC supply for +1.8VD
JP17 Short 3 - 2 DC supply, LDO for +5V
JP19 Short 3 - 2 DC supply, LDO for +1.8V
JP28 Short 3 - 2 DC supply, LDO for +5V
JP29 Short 3 - 2 DC supply, LDO for +3.3VCLK
JP26 Open DC supply for ext buffer
JP27 Open DC supply for ext buffer
JP3 Short 2 - 3 OPA power down
JP4 Short 2 - 3 OPA power down
JP22 Open SDOUT to FPGA
JP20 Short 1 - 2 CDC
JP21 Short 1 - 2 CDC
J14 Short 1 - 2 CDC power down
J18 Open CDC, VCXO
JP8(1) Short 3 - 2 ADC SCLK for SPI
JP9 Short 3 - 2 ADC SDATA for SPI
JP10 Short 3 - 2 ADC SEN for SPI
JP11 Short 3 - 2 ADC for SPI, also reset
JP 12 Short 1 - 2 ADC Low speed mode disable
JP 13 Open
(1) The EVM schematic shows default setting of JP8 to JP11 as parallel interface Table 2) which is for EVM installation. After EVM
tested and released these jumpers are set as serial interface (Table 1).
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Table 1. Default ADS42Bxx EVM Revision A Jumper Setting for Serial Interface (continued)
Jumper Default position Function
JP14 Short 7 - 8 ADC 2’s complement, DDR LVDS
JP5 Short 1 - 2 ADC CTRL3, normal operation
JP6 Short 1 - 2 ADC CTRL2, normal operation
JP7 Short 1 - 2 ADC CTRL1, normal operation
JP 18 Short 1 - 2 Ext Buffer
JP 23 Short 1 - 2 Ext Buffer
JP 24 Short 1 - 2 Ext Buffer
JP 25 Short 1 - 2 Ext Buffer
JP30 Short ADC buffer 3.3-V supply
Table 2. Parallel Interface with Pin Control of ADS58C28 and ADS42Bxx EVM Revision B Jumper
Setting
Jumper Position Function
JP8 Short 1 - 2 ADC SCLK for parallel control
JP9 Short 1 - 2 ADC SDATA for parallel control
JP10 Short 1 - 2 ADC SEN for parallel control
JP11 Short 1 - 2 ADC parallel control
2.3 Test Set-Up Connections
• Connect the ADS42B4x EVM to TSW1400 EVM
• Connect 5-V power to banana jack at J10; connect ground to J12
• Connect USB cable to programming computer at J17
• Connect USB and power supply jack to TSW1400
• Connect the clock signal through the appropriate BPF to J19
• Connect the input signal through the appropriate BPF to J6/J3
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2.4 TSW1400 Quick Start Operation
Reference the TSW1400 User’s Guide for more detailed explanation of the TSW1400 set-up and
operation. This document assumes that High Speed Data Converter Pro (HSDCPro) is installed and
functioning properly. The front panel of HSDCPro is shown in Figure 4. The following configuration needs
to be changed from the default settings. Note that HSDCPro version 3.1 or newer is required to properly
run the ADS42B4x EVM.
• Select the ADS42B4x device name from the TI ADC Selection pull-down menu
• Select Single Tone for FFT from the Test pull-down menu
• Select the desired channel (that is, Channel A or B) from the Channel Display pull-down menu
• Check the box for Auto Calculation of Coherent Frequencies.
• Change the ADC sampling rate to the desired value (that is, 250 MHz)
• Change the input frequency to desired value (that is, 170 MHz or other)
• Verify status display in the lower left has no errors
• Press the Capture button to initiate a data capture. The ADS42B4x EVM must be configured before a
capture can be made.
Figure 4. High Speed Data Converter Pro
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2.5 ADS42B4x Test Procedure
• Switch on the 5-V power supply for the EVM.
• Connect clock signal at J19 through an appropriate bandpass filter.
– Set the signal generator to 10 dBm and 250 MHz.
– Use a high-quality, low phase-noise generator for this input to ensure proper device evaluation.
– A tight bandpass filter is required to achieve optimal performance.
• Connect the input signal through an appropriate bandpass filter at either J6 or J3 (Channel A or B).
– Adjust the frequency of the generator to match the coherent frequency displayed in HSDCPro.
– Select the proper Display Channel in HSDCPro, corresponding to the input connection.
– Use a high-quality, low phase-noise generator for this input to ensure proper device evaluation.
– A tight bandpass filter is required to achieve optimal performance.
• Open the ADS42B4x GUI by going to the Start Menu and finding ADS42B4x GUI in the Texas
Instruments folder.
– Press the Reset button.
– Press the Data Format button to choose "Offset Bin"
– Turn on HP[1:11] to enable the high performance modes.
– Click Send All, see Figure 5.
• Initiate a capture by pressing the Capture button in HSDCPro.
Figure 5. ADS42Bxx GUI
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2.6 ADS42B4x Performance Results
Figure 6 shows the performance result at 250-MSPS clock frequency and with a 170-MHz input tone.
Figure 6 shows the performance of channel A from ADS42B4xEVM. SNR is 69.85 dBFS and SFDR is
82.85 dBFS.
Figure 6. FFT Plot: 250-MHz clock, 170-MHz Input to Channel A
Figure 7 shows the performance of channel B from ADS42B4xEVM. SNR is 69.94 dBFS and SFDR is
84.77 dBFS.
Figure 7. FFT Plot: 250-MHz clock, 170-MHz Input to Channel B
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3 Optional Configurations
3.1 THS4509 Input Op-Amp Configuration
The default analog input configuration is transformer coupling through T1 and T2 for channel A, and T3
and T4 for channel B. The optional configuration for analog input is through an Op-Amp THS4509. The
changes required to modify the transformer coupled input to the OPA-driven input are shown in Table 3.
Table 3. Jumper Setting for Transformer-coupled or OPA-driven Input
Jumpers or 0 ΩTransformer-coupled input (default) OPA-driven input
R119 Install Do not install
R123 Install Do not install
R120 Do not install install
R129 Do not install install
R143 Install Do not install
R141 Install Do not install
R131 Do not install Install
R132 Do not install Install
R93 Install Do not install
R94 Install Do not install
R95 Do not install Install
R96 Do not install Install
R97 Install Do not install
R98 Install Do not install
R99 Do not install Install
R114 Do not install Install
SJP3 Shunt 2 - 3, default Shunt 1-2
SJP4 Shunt 2 - 3, default Shunt 1-2
J11 and J13 are the power supply for the THS4509. An on-board layout option for a LPF or BPF is
available between the amplifier and the ADC. By default the filter is bypassed, allowing the flexibility to
design according to desired specifications.
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