National Semiconductor ADC081500DEV Manuale utente

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March 24, 2006

Revision A

Development Board Instruction Manual

ADC081500DEV - Single 8-Bit, 1.5 GSPS, 1.2W A/D Converter with

Xilinx Virtex 4 (XC4VLX15) FPGA

ADC08

1500DEV Development Board

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ADC081500EVAL BOARD USER MANUAL – TABLE OF CONTENTS

ADC081500EVAL BOARD USER MANUAL – TABLE OF CONTENTS ........................2

1.0 Introduction........................................................................................................................... 3

2.0 Board Assembly.................................................................................................................... 3

3.0 Quick Start............................................................................................................................ 4

4.0 Functional Description .......................................................................................................... 4

4.1 Input circuitry...................................................................................................................... 4

4.2 ADC reference.................................................................................................................... 4

4.3 ADC clock........................................................................................................................... 4

4.4 Digital Data Output............................................................................................................. 4

4.5 Power Requirements..........................................................................................................5

4.6 Power Supply Connections................................................................................................ 5

5.0 Obtaining Best Results ......................................................................................................... 5

5.1 Clock Jitter.......................................................................................................................... 5

6.0 Evaluation Board Specifications ........................................................................................... 5

7.0 Schematic Drawing ADC081500DEV – Onboard Clock (VCO + PLL) ................................. 6

7.1 Schematic Drawing ADC081500DEV – Analog Inputs (I,Q) & Digital Trigger Input........... 7

7.2 Schematic Drawing ADC081500DEV – ADC connected to Virtex4 FPGA ........................ 8

7.3 Schematic Drawing ADC081500DEV – USB Interface...................................................... 9

7.4 Schematic Drawing ADC081500DEV – Power Supplies 1 .............................................. 10

7.5 Schematic Drawing ADC081500DEV – Power Supplies 2 .............................................. 11

7.6 Schematic Drawing ADC081500DEV – Expansion Header Interface.............................. 12

8.0 Bill of Materials (Page 1 of 2).............................................................................................. 13

8.1 Bill of Material (Page 2 of 2)............................................................................................. 14

9.0 Using the Wavevision4 software with the ADC081500DEV ............................................... 15

9.1 Getting Started................................................................................................................. 15

9.2 Control Panel.................................................................................................................... 17

9.3 Serial Control Mode.......................................................................................................... 19

9.4 Capturing Waveforms....................................................................................................... 20

10.0 Appendix A - Hardware Information.................................................................................. 20

10.1 LED functions................................................................................................................. 20

10.2 Expansion Header.......................................................................................................... 21

10.3 System Block Diagram................................................................................................... 22

11.0 Appendix B - Installing and running the Wavevision 4 software....................................... 23

11.1 Install the WaveVision Software..................................................................................... 23

11.2 Java™ Technology......................................................................................................... 23

11.3 Automatic Device Detection & Configuration ................................................................. 23

11.4 Windows Driver.............................................................................................................. 23

12.0 Appendix C - Using WaveVision Plots.............................................................................. 24

The Waveform Plot................................................................................................................. 24

The FFT Plot .......................................................................................................................... 24

FFT Options ........................................................................................................................... 25

Histogram Plots...................................................................................................................... 26

Information Viewer ................................................................................................................. 26

Data Import and Export..........................................................................................................26

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1.0 Introduction

The ADC081500DEV Board is designed to

allow quick evaluation and design development

of National Semiconductor’s ADC081500 8-bit

Analog-to-Digital Converter. This device is

specified for 1.5 GSPS operation.

This development board is designed to function

with National Semiconductor’s WaveVision

Software, for fast evaluation. It requires only 3

connections to get started: a Power Supply, a

USB Interface to PC and a Signal Source. A

1.5GHz Clock generator is provided on board

and the system also allows an external clock to

be used if alternative sample rates are required.

The ADC connects to a Xilinx Virtex4 FPGA

which stores up to 4K of data from each

channel before transferring it through the USB

interface to the PC.

2.0 Board Assembly

The ADC081500 Development Board comes in

a low profile plastic enclosure and requires no

assisted cooling due to its low power

consumption. The ADC081500 device is

configured entirely through software and also

allows changes to easily be made to the FPGA

configuration to enable system development.

Analog I Channel

Input

Clock Input

USB

Figure 1 Component Placement & Front Panel

PWR

INPUT

Trigger Input

PWR

SWITCH

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3.0 Quick Start

Refer to Figure 1 for locations of the power

connection, signal input and USB port.

IMPORTANT NOTE:

Install the Wavevision 4 Software before

connecting this product to the PC. See

Appendix B – Installing Wavevision.

For quick start operation:

1. Connect the 12V DC power source

(included with the development board) to the

rear Power Connector labeled (8-12V DC).

2. Connect a stable sine wave source capable

of supplying the desired input frequencies at

up to 8 dBm. Connect this signal to the front

panel SMA connector labeled “I CH.”

through a band pass filter. The exact level

needed from the generator will depend upon

the insertion loss of the filter used.

3 Connect the USB cable (included) from the

USB port to the PC. If this is the first time

the board has been connected, Windows

may install the drivers for this product at this

time.

5. Push the Power Switch to the ON position

on the rear panel and check that the Green

LED between the switch and the power

connector illuminates.

6. Start the Wavevision 4 Software

7. Once loaded the “Firmware Download”

Progress bar should be displayed. See

Appendix B for more information.

8. Upon Firmware Download completion, the

control panel for the board should

automatically be displayed on the PC and

the CLK LED on the front panel should be

flashing.

8. Set the signal source for the analog input to

8 dBm at the desired frequency. Observe

the ‘Out of Range’ LED “OVR” on the front

panel is illuminated. If this LED is not on,

increase the input signal source until it is.

9. Reduce the input level until the ‘OVR’ LED

just turns off.

10. From the Wavevision 4 pull-down menu

select “Acquire” and then samples. The

system will then capture the input waveform

and display the results in the time domain.

11. For FFT Analysis click the FFT Tab.

4.0 Functional Description

The ADC081500 Development Board schematic

is shown in Section 7.0.

4.1 Input circuitry

The input signal(s) to be digitized should be

applied to the front panel SMA connectors

labeled “I CH.” and “Q CH.”. These 50 Ohm

inputs are intended to accept a low-noise sine

wave signals. To accurately evaluate the

dynamic performance of this converter, the input

test signals will have to be passed through a

high-quality bandpass filter with at least 10-bit

equivalent noise and distortion characteristics.

This evaluation board as delivered is set up for

operation with two single-ended analog inputs,

which are converted to differential signals on

board.

Signal transformer T2, is connected as a balun,

and provides the single-ended to differential

conversion. The differential PCB traces to the

ADC analog input pins have a characteristic

differential impedance of 100 Ohms.

No scope or other test equipment should be

connected anywhere in the signal path while

gathering data.

4.2 ADC reference

The ADC081500 has an internal reference that

can not be adjusted. However, the Full-Scale

(differential) Range may adjusted with the

Software Control Panel Refer to Section 9.0 for

more information

4.3 ADC clock

The ADC clock is supplied on board and is fixed

at 1.5GHz. An external clock signal may be

applied to the ADC through the SMA Connector

labeled “CLOCK” on the front panel. The balun-

transformer (T1) converts the single ended clock

source to a differential signal to drive the ADC

clock pins

Note that it is very important that the ADC clock

should be as free of jitter as possible or the

apparent SNR of the ADC081500 will be

compromised.

4.4 Digital Data Output

The digital output data from the ADC081500 is

connected to a Xilinx 4 FPGA. Up to 4K Bytes of

data can be stored and then uploaded over the

USB interface to the Wavevision 4 software. The

FPGA logic usage is low allowing further code to

be written and tested for product development.

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4.5 Power Requirements

The power supply requirement for the

ADC081500 Evaluation Board is 12V at 800mA.

Most of the regulators on board are switching

regulators for increased power efficiency.

The board typically draws around 500mA but it

is always good practice to have extra power

reserve in the power supply over the typical

power requirements.

A Universal 100-240V AC input to 12V DC Brick

Power Supply is included with the development

board.

4.6 Power Supply Connections

Power to this board is supplied through the

power connector on the rear panel. It is advised

that only the supplied PSU is used with this

board.

The ADC081500 supply voltage has been set to

1.9V, ±50 mV.

5.0 Obtaining Best Results

Obtaining the best results with any ADC

requires both good circuit techniques and a

good PC board layout. For layout information for

this product please contact you nearest National

Semiconductor representative.

5.1 Clock Jitter

When any circuitry is added after a signal

source, some jitter is almost always added to

that signal. Jitter in a clock signal, depending

upon how bad it is, can degrade dynamic

performance. We can see the effects of jitter in

the frequency domain (FFT) as "leakage" or

"spreading" around the input frequency, as seen

in Figure 2a. Compare this with the more

desirable plot of Figure 2b. Note that all dynamic

performance parameters (shown to the right of

the FFT) are improved by eliminating clock jitter.

Figure 2a. Jitter causes a spreading around the input

signal, as well as undesirable signal spurs.

Figure 2b. Eliminating or minimizing clock jitter results in

a more desirable FFT that is more representative of how

the ADC actually performs.

6.0 Evaluation Board

Specifications

Board Size: 168mm x 100mm

Power Requirements: +12V, 800mA

Clock Frequency Range : 200 MHz to 1.5 GHz

Analog Input Range (AC Coupled) 30MHz to 1800MHz

Nominal Analog Input Voltage: 560 mV P-P to 870 mV P-P

Impedance: 50 Ohms

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7.0 Schematic Drawing ADC081500DEV – Onboard Clock (VCO + PLL)

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7.1 Schematic Drawing ADC081500DEV – Analog Inputs (I,Q) & Digital Trigger Input

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7.2 Schematic Drawing ADC081500DEV – ADC connected to Virtex4 FPGA

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7.3 Schematic Drawing ADC081500DEV – USB Interface

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7.4 Schematic Drawing ADC081500DEV – Power Supplies 1

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