Texas Instruments ADC1 D (RF )RB Series Manuale utente

ADC1xDxxxx(RF)RB Reference Board

User's Guide

Literature Number: SNAU146

September 2013

User's Guide

SNAU146–September 2013

ADC1xDxxxx(RF)RB Reference Board

1 Overview

The ADC1xDxxxx(RF)RB demonstrates a high-performance signal acquisition sub-system that achieves

10/12-bit resolution and corresponding SNR and dynamic range on two channels at signal frequencies in

excess of 1.0 GHz and sampling rates of up to 1.8 GS/s on two channels or one channel at a sampling

rate of up to 3.6 GHz.

Since the 10- and 12-bit GSPS ADC family is pin-compatible, the same PCB is able to support the

following devices:

• ADC12D1800RF, ADC12D1600RF, ADC12D800RF

• ADC12D1800, ADC12D1600

• ADC10D1500

In some cases, the same board may be used to evaluate two different products, with the addition of an

external signal generator. For example, to evaluate the ADC10D1000, use the ADC10D1500RB with an

external clock signal generator running at 1GHz. The table below shows which Reference Board (RB) to

use to evaluate which product.

Figure 1. ADC1xDxxx_board1

2ADC1xDxxxx(RF)RB Reference Board SNAU146–September 2013

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Overview

Table 1. Reference Board to Evaluate GSPS ADC

Product to Evaluate Reference Board to Use

ADC12D1800RF ADC12D1800RFRB

ADC12D1600RF ADC12D1600RFRB

ADC12D1000RF ADC12D1600RFRB

ADC12D800RF ADC12D800RFRB

ADC12D500RF ADC12D800RFRB

ADC12D1800 ADC12D1800RB

ADC12D1600 ADC12D1600RB

ADC12D1000 ADC12D1600RB

ADC10D1500 ADC10D1500RB

ADC10D1000 ADC10D1500RB

The board showcases the following Texas Instruments devices:

•ADC1xDxxxx(RF) analog-to-digital converter

•LMX2541 clock synthesizer

•LP3878 and LP38513-ADJ linear LDO regulators

•LM20242, LM25576 and LM26400 switching regulators

•LM3880 power sequencing controller

•LM95233 temperature sensor

In addition, the board also employs the Xilinx XC4VLX25-11FFG668 Virtex-4 FPGA for the critical

function of capturing the high-speed digital data sourced by the ADC.

1.1 Features

❏Demonstrates the ADC1xDxxxx(RF)'s typical dynamic performance – see the datasheet for full details.

❏Dual channel sample rates of up to 1.8 GS/s (limited by the ADC specifications and the FPGA capture

limitations)

❏Single channel (Interleaved) sample rates of up to 3.6 GS/s (limited by the ADC specifications and the

FPGA capture limitations)

❏FMC Expansion Header for streaming data capture

❏SMA I/O for easy AutoSync feature evaluation

❏External Hardware Trigger

❏Status LEDs

❏On-board LMX2541 based clock circuit with option for a selectable external clock

❏A complete high-performance low-noise power management section for the ADC, clock circuit, FPGA

and USB controller

❏Single +12V power adapter input

❏Simplicity and performance of USB 2.0 connection to the PC

❏Functions with Texas Instruments' latest WaveVision 5 signal-path control and analysis software

SNAU146–September 2013 ADC1xDxxxx(RF)RB Reference Board

Overview

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1.2 Packing List

The ADC1xDxxxx(RF)RB kit consists of the following components:

• ADC1xDxxxx(RF)RB Reference Board

• Hardware Kit Including

– 110V-240V AC to +12V DC Power Adapter

– USB cable

– 4 – DC blocks

– 2 – 50Ωterminators

– 1 – ADC-LD-BB low distortion balun board useful bandwidth of 400 MHz to 3 GHz)

– 1 – ADC-WB-BB wide band balun board (useful bandwidth of 4.5 MHz to 3 GHz)

– 4 – 6” SMA cables

The most up-to-date documentation can be found on the product web folder; the Design Package contains

FPGA source code, schematic, layout, and BOM source files. The WaveVision5 software may be

downloaded for free from Texas Instruments web site: http://www.ti.com/tool/wavevision5.

1.3 References

• *ADC1xDxxxx(RF) data sheet

• *LMX2541 data sheet (SNOSB31)

• *Application Note 2132: Synchronizing Multiple GSPS ADCs in a System: The AutoSync Feature

(SNAA073)

*Note: See www.TI.com for the latest edition of all data sheets and application notes.

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Overview

1.4 Board Orientation

Figure 2. ADC1xDxxxx(RF)RB Board Layout

SNAU146–September 2013 ADC1xDxxxx(RF)RB Reference Board

Quick Start

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2 Quick Start

This section will aid in bringing up the board for the first time as well as a brief tutorial on the WaveVision

5 (WV5) software. Further description of the Reference Board is in subsequent sections of this document.

The software is further described in the WaveVision 5 Users' Guide or the HELP function within the

software. The ADC1xDxxxx(RF) and LMX2541 data sheets should be consulted for detailed

understanding of device functionality.

The user is advised to construct a lab setup as close to the one shown in Figure 3 as possible. This setup,

along with the board and software configuration described below, is what was used to test the reference

board at Texas Instruments lab. This set of conditions produces the stated reference performance – which

is normally included with each board shipped to customers. The objective is to assure that the user can

achieve the same performance as that recorded at Texas Instruments lab prior to board shipment.

Figure 3. Recommended Lab Setup. A filter may not be necessary on the clock if the generator is very

clean (beyond –80dBm SFDR).

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Quick Start

2.1 Installing the WaveVision 5 Software

Note: The WaveVision 5 software will function on Windows 7 and Windows XP 32-bit operating systems.

1. Navigate to the web page:

2. Download the WaveVision5 software to PC or laptop and unzip the file.

3. Run the WV5.exe file.

4. Follow the on-screen instructions to complete the installation.

2.2 Installing the ADC1xDxxxx(RF)RB Hardware

1. Place the ADC1xDxxxx(RF)RB Reference Board on a clean, static-free surface.

2. Connect the enclosed +12V DC power adapter to the power jack. Connect the other side of the power

supply to an AC outlet (100-240 VAC, 50-60 Hz).

3. Connect (but do not yet turn on) the input signal generator, the band-pass filter, the balun and the DC

blocks to the ADC1xDxxxx(RF)RB Reference Board's I-channel input connectors. Set the signal

generator at one of the frequencies and signal levels stated in the reference performance report.

Always use high-quality RF SMA cables for optimum performance.

NOTE: Do not overdrive the signal and clock inputs as the ADC may be damaged. Refer to the

Electrical Specification section of the datasheet for the voltage tolerance of these inputs.

Including insertion loss from filters, baluns, cables, DC blocks, etc. input power should not

exceed operating limits as found in the datasheet.

4. In the Texas Instruments lab, the following (or equivalent performance) equipment are used to test the

board. It is essential that the customer use signal generators, filters, DC blocks and a balun of

equivalent or better performance.

• Rohde & Schwarz SME-03 or SMA-100 signal generator

• Filters - Trilithic 5VF 5% tunable bandpass filter or other fixed frequency bandpass filter of

equivalent performance

• Balun – ADC-LD-BB

• DC blocks – Mini Circuits BLK-89 S+

• 50Ωterminators – Mini Circuits ANNE 50+

Note: The board comes equipped with DC-blocks applied to the I-channel signal input connectors and

DC blocks and terminators applied to the unused Q-channel input connectors. These must be used at

all times - that is, the channel being used must be connected through dc-blocks if the ADC is

configured for ac-coupled operation (as shipped). The unused channel must also be DC blocked then

terminated to ac ground. This is graphically illustrated in Figure 3.

5. Turn on the SW2 rocker power switch. Verify that the red LED (labeled LD10, near the J12 power jack)

is lit.

6. Connect the supplied USB 2.0 cable from the PC USB port to the ADC1xDxxxx(RF)RB USB jack. Note

that the power should be turned on before the USB cable is plugged in.

2.3 Launch the WaveVision 5 Software

Start the WaveVision 5 software on your computer by selecting the desktop icon “WaveVision 5” or by

clicking on the Start button, and selecting

Programs -> WaveVision 5 -> WaveVision 5

The software will automatically detect the board and load the appropriate software profile and will proceed

to download the controller firmware and FPGA code onto the reference board. As an alternative, the icon

on the desktop can be used to launch WaveVision 5. The WaveVision 5 user interface will appear on the

computer screen.

The status LED’s should take on the following states when the system is initially powered up, Wavevision

5 has loaded the FPGA image and the system is ready for an acquisition (where green is on, black is off):

SNAU146–September 2013 ADC1xDxxxx(RF)RB Reference Board

DCLK_LOCKED

OVER-RANGE_Q-CH

TRIGGER_ARMED

ADC_POWER

ADC_CALIBRATION

OVER-RANGE_I-CH

FPGA_OPERATIONAL

ECM_ENABLED

RCOUT1/2_ENABLED

Quick Start

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Figure 4. Note: The status of LED’s are valid, only if the FPGA_OPERATIONAL LED is lit

Meaning of the status LED’s:

•DCLK_LOCKED: If FPGA detects DCLKI and DCLKQ toggling, this LED lights. NOTE: If the board

has been modified for AutoSync to route DCLKQ to the SMA’s, this LED will not be lit.

•OVER-RANGE_Q-CH: ADC’s overrange Q-ch pin pulse stretched to around a half second when

overranged.

•TRIGGER_ARMED: Lights when “H/W Trigger” is checked inside the Wavevision 5 GUI. Does not

clear upon data capture.

•ADC_POWER: Lights when ADC supply voltage of 1.9V is detected.

•ADC_CALIBRATION: Will light temporarily when calibration is run. ADC’s CalRun pin is pulse

stretched to about a half second.

•OVER-RANGE_I-CH: ADC’s overrange I-ch pin pulse stretched to around a half second when

overranged.

•FPGA_OPERATIONAL: Lights when FPGA’s 100MHz reference is locked and FPGA is out of reset.

•ECM_ENABLED: Lights when ADC is in Extended Control Mode.

•RCOUT1/2_ENABLED: Lights when AutoSync RCOUT1/2 clocks are detected. Enabled when

AutoSync-> DOC (disable output clocks) bit is unchecked in Wavevision 5 GUI.

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Quick Start

2.4 WaveVision 5 - User Interface Overview

Figure 5. WaveVision 5 Example Window

Figure 5 above shows the WV5 user interface panel (GUI). This is the top level interface panel. It is

arranged in such a way that the plot is always in the middle. There are tabs arranged on each side of the

window to give the user additional information or control of features.

The tabs available on the left side access panels that are pertinent to the current plot window - such as

channel selection, grid selection, FFT Readouts, and FFT controls.

The right side panels allow the user to take control of the hardware. These include the Signal Source,

Signal Control and Registers panels (the most relevant for this board).

In addition, a small FFT parameter summary box can be displayed by pressing CTL-R.

For more details on the general operation and use of WaveVision 5, see the WaveVision 5 Users Guide.

SNAU146–September 2013 ADC1xDxxxx(RF)RB Reference Board

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2.5 System / Device Configuration

Prior to capturing data, confirm that the board is in the "ECE (Extended Control Enable)" mode, The ECE

jumper is located in the ADC pin control jumper area as shown in Figure 6. The board should be sent with

this jumper in place. This means that the ADC will be controlled through the SPI interface and not with

jumpers driving the control pins. This allows the user to control the ADC's behavior through the

WaveVision 5 Registers panel.

Figure 6. WaveVision 5 overview of control buttons

Figure 7. WaveVision 5 main window command buttons

10 ADC1xDxxxx(RF)RB Reference Board SNAU146–September 2013

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