Texas Instruments ADS540x Manuale utente

User's Guide

SLAU450–July 2012

ADS540x and ADS54T0x Evaluation Module (EVM)

This user's guide describes the operation of the Texas Instruments ADS540x or ADS54T0x evaluation

module (EVM). The EVM provides a platform for evaluating the ADS540x or ADS54T0x, a two-channel,

12-bit ADC operating at sampling rates of up to 800 MSPS with the digital data output on two 12-bit LVDS

parallel busses on a Samtec connector.

This EVM is ideally suited for mating with the TSW1400 or TSW1405 Capture Card for performing a data

capture into a capture buffer, uploading the sample data to a PC, performing a Fast Fourier Transform

(FFT), and reporting on signal-to-noise ratio (SNR), spurious-free dynamic range (SFDR), and other

performance metrics.

Contents

1 Introduction .................................................................................................................. 2

1.1 EVM Block Diagram ............................................................................................... 2

1.2 EVM Power Supply ................................................................................................ 3

1.3 EVM Jumpers and Switches ...................................................................................... 4

1.4 EVM Solder Options ............................................................................................... 5

2 Software Control ............................................................................................................ 7

2.1 Installation Instructions ............................................................................................ 7

2.2 Software Operation ................................................................................................ 7

3 Basic Test Procedure ....................................................................................................... 9

3.1 Test Block Diagram ................................................................................................ 9

3.2 Test Set-up Connection ........................................................................................... 9

3.3 ADS540x Software Quick Start Guide ......................................................................... 10

List of Figures

1 Simplified EVM Block Diagram............................................................................................ 2

2 Simplified EVM Power Supply............................................................................................. 3

3 EVM Jumpers and Switches............................................................................................... 4

4 EVM Solder Options........................................................................................................ 5

5 Control Option............................................................................................................... 8

6 Test Setup Block Diagram................................................................................................. 9

7 Trigger Option Dialog Window........................................................................................... 11

8 TSW1405 FFT Result..................................................................................................... 11

List of Tables

1 Square Post Jumpers ...................................................................................................... 6

2 Surface Mount Jumpers.................................................................................................... 6

SLAU450–July 2012 ADS540x and ADS54T0x Evaluation Module (EVM)

ADS5402

USB SPI Port

Trigger

Analog

Inputs

Clock

Sync

(not Installed)

5V Power

Supply

Circuits

LVDS DDR

CLK, DATA

J11

Introduction

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1 Introduction

1.1 EVM Block Diagram

Figure 1 shows a simplified block diagram of the default configuration of the EVM. Each analog input is

supplied to the EVM through a single-ended SMA connection, then transformer coupled to turn the single-

ended signal into a balanced differential signal, and then input to the ADS540x. A dual transformer input

circuit is used for better phase and amplitude balance of the input signal than would typically be produced

by a single transformer input circuit.

Figure 1. Simplified EVM Block Diagram

The clock input is supplied by way of a single-ended signal to an SMA connector and transformer coupled

to produce a differential clock signal for the ADS540x.

Power to the EVM is supplied using a single 5-V connection by way of banana jacks. All necessary

voltages for the ADS540x are derived from the 5-V input connection.

For the ADS54T0x EVM, a trigger signal may be input to the trigger SMA connector to trigger the burst of

high resolution sample data from the ADC. This trigger signal may be sourced by the TSW1400 Capture

Card.

2ADS540x and ADS54T0x Evaluation Module (EVM) SLAU450–July 2012

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TPS79601

LDO 3.3 V To LVDS buffer for trigger

TPS79601

LDO Regultor

3.3 V

TPS79601

LDO 1.8 V

GND

5 V

JP12

Analog 3.3 V

VDD

Digital

VDD

To ADC

JP14

Analog 1.8 V

VDD

To ADC

JP15

Analog

VDD

To ADC

JP13

To ADC

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Introduction

1.2 EVM Power Supply

Figure 2 illustrates the power supply options available on the EVM. Jumpers are used to choose the

power supply options, with the default jumper positions indicated by the darker portion of the jumper that

represents the presence of the jumper.

The EVM requires a 5-V input supply, input directly to the banana jack, J7. From the 5-V supply rail, linear

low dropout (LDO) regulators are used to generate the 1.8 V for the analog and digital supplies for the

ADS540x, the 3.3 V for the 3.3-V analog supply of the ADS540x, and the 3.3-V supply needed for an

LVDS buffer to buffer the optional trigger signal into the ADS540x.

Figure 2. Simplified EVM Power Supply

SLAU450–July 2012 ADS540x and ADS54T0x Evaluation Module (EVM)

LVDS LVDS

ADC

JP15 JP14

BIN

JP1

Enable 1

/BIN

J11

SW1

J10

USB

/AIN

AIN

Trigger

J9J2

Sync

SW2

Trigger

CLKIN

JP13

1JP12

JP5

GND

Introduction

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1.3 EVM Jumpers and Switches

There are a number of jumpers on the EVM for selecting operational modes of the ADC, power supply

options, and SPI port options. Many of the jumper selections that involve DC inputs or static control

signals are by way of push-on square post jumpers. Figure 3 illustrates the position of the jumpers relative

to the more recognizable features of the EVM such as the banana jacks or SMA inputs. Jumper selections

that involve high-speed switching signals are implemented by way of surface mount 0-Ωjumper resistors,

and these are represented in Figure 4. In both figures, default positions of the jumpers as the EVM is

normally shipped are indicated. Note that some of the jumpers are, by default, left open circuit. The

surface-mount jumper resistors require soldering to change from default to any other desired

configuration.

The functions of the connectors, LEDs and pushbutton switches are described by their labels in Figure 2.

The presence of the 5-V supply voltages to the EVM is indicated by LED D1 lighting.

Figure 3. EVM Jumpers and Switches

There are two pushbutton switches on the EVM. Pushbutton switch SW1 is used to assert a reset signal

to the ADS540x. The ADS540x requires a reset before it is configured for use, but it is not necessary to

use SW1. The ADS540x SPI GUI may be used to toggle the reset register bit in the ADS540x register

map.

The trigger signal to the ADS54T0x may be sourced by the SMA connector J9, the Samtec connector J11,

or the pushbutton SW2 depending on the position of the surface mount jumper SJP1.

4ADS540x and ADS54T0x Evaluation Module (EVM) SLAU450–July 2012

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Introduction

1.4 EVM Solder Options

Figure 4. EVM Solder Options

Table 1 lists the jumper options of the EVM by category, the default position of the jumper, and a

description of what the jumper does in the possible positions that the jumper might be set. Three pin

jumpers have an indication of pin 1 position both in Figure 2 and in the silkscreen on the top of the EVM

itself. A jumper installed between pins 1 and 2 is designated by 1-2 while a jumper installed between pins

2 and 3 is designated by 2-3. For more detailed information on the function of each jumper position,

consult the ADS540x datasheet.

SLAU450–July 2012 ADS540x and ADS54T0x Evaluation Module (EVM)

Introduction

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Table 1. Square Post Jumpers

Jumper Default Description

Power Supply

JP12 1-2 Connects 3.3-V supply to analog 3.3-V supply of ADS540x

JP13 1-2 Connects 1.8-V supply to digital 1.8-V supply of ADS540x

JP14 1-2 Connects 1.8-V supply to analog 1.8-V supply of ADS540x

JP15 1-2 Connects 1.8-V supply to analog 1.8-V supply AVDDC of ADS540x

(Jumpers JP12, JP13, JP14, JP15 have a ground connection on post 3 allowing use of a 2-post external supply cable connected to

posts 2 and 3, if the different ADC supply domains are driven individually)

ADC Control Pins

SJP1 1-3 Position 1-3 connects trigger input to SMA J9

Position 2-3 connects trigger input to pushbutton switch SW2

Position 4-3 connects trigger input to Samtec connector for trigger from the capture card

JP1 1-2 Connects Enable pin to DVDD. ( Position 2-3 connects Enable to Gnd)

USB Port Power

JP5 1-2 IO Supply Selection (1-2 power from USB port) (2-3 power from EVM)

Surface mount 0-Ωresistor jumpers are described in Table 2. The four SPI lines to the ADC (SCLK, SEN,

SDATA, SDO) are, by default, driven by the USB port on the EVM under the control of the ADS540x SPI

GUI software. Alternatively, drive the SPI signals into the ADC by a field-programmable gate array (FPGA)

located on the capture card that connects to the Samtec connector, in which case four surface mount

resistors must be removed from their default positions and soldered in the alternate positions.

The ADS540x outputs a common mode voltage that may be used to bias the common mode level of the

analog signal. Since the ADS540x has a buffered analog input and the input signal is internally biased to

VCM if the signal is AC coupled, the VCM pin is, by default, unconnected. Install a 0-Ωjumper resistor to

connect the VCM to the analog input termination network.

Table 2. Surface Mount Jumpers

Jumper Default Description

R5 open Connects VCM to transformer termination mid-point for channel 1

R6 open Connects VCM to transformer termination mid-point for channel 2

R12 open Connects the optional trigger signal to the Samtec connector for trigger sourced from the capture card

FPGA

R18 open Connects SEN to TSW140x

R16 installed Connects SEN to USB port

R15 installed Connects SDATA to USB port

R38 open Connects SDATA to TSW140x

R14 installed Connects SCLK to USB port

R43 open Connects SCLK to TSW140x

R17 open Connects SDO to USB port

R45 open Connects SDO to TSW140x

Analog Input Channel Single Ended vs. Differential Option

R20 open Connects SMA Channel A + input to bypass input transformers

L1 0-ΩR Connects SMA Channel A + input to input transformers

R19 open Connects SMA Channel A - input to GND

L2 0-ΩR Connects SMA Channel A - input to bypass input transformers

R39 open Connects Channel A + input bypassing transformers

C14 1 µF Connects Channel A + input from transformers

R40 open Connects Channel A – input bypassing transformers

C15 1 µF Connects Channel A – input from transformers

R23 open Connects SMA Channel B + input to bypass input transformers

6ADS540x and ADS54T0x Evaluation Module (EVM) SLAU450–July 2012

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Software Control

Table 2. Surface Mount Jumpers (continued)

Jumper Default Description

L3 0-ΩR Connects SMA Channel B + input to input transformers

R30 open Connects SMA Channel B – input to GND

L4 0-ΩR Connects SMA Channel B – input to bypass input transformers

R42 open Connects Channel B + input bypassing transformers

C16 Installed Connects Channel B + input from transformers

R41 Installed Connects Channel B – input bypassing transformers

C17 Installed Connects Channel B – input from transformers

2 Software Control

2.1 Installation Instructions

• Open folder named ADS540x_Installer_vxpx (xpx represents the latest version, which is 1.3 at the time

of this writing)

• Run Setup.exe

• Follow the on-screen instructions

• Once installed, launch by clicking on the ADS540x_GUI_vxpx program in Start →Texas Instruments

ADCs

• When plugging in the USB cable for the first time, the Found-New-Hardware-Wizard prompts for the

installation of the USB drivers.

– When a pop-up screen opens, select Continue Downloading.

– Follow the on-screen instructions for installing the USB drivers

– If needed, access the drivers directly in the install directory

2.2 Software Operation

The software allows programming control of the ADC device. The front panel provides a tab for full

programming of the register map of the ADS540x. The GUI tabs provide a convenient and simplified

interface to the most used registers of each device.

SLAU450–July 2012 ADS540x and ADS54T0x Evaluation Module (EVM)

Software Control

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2.2.1 Control Options

Figure 5. Control Option

2.2.2 Register Control

•Send All: Sends the register configuration to all registers

•Read All: Reads register configuration from ADS540x registers (Not implemented in v1.3)

•Save Regs: Saves the register configuration for all registers

•Load Regs: Load a register file for all registers. Sample configuration files for common frequency

plans are located in the install directory.

– Select Load Regs button.

– Double click on the data folder.

– Double click on the desired register file.

– Click Send All, ensuring all of the values are loaded properly.

2.2.3 Misc Settings

•Reset USB: Toggle this button if the USB port is not responding. This generates a new USB handle

address

Note: Reset the board after every power cycle and click the Reset USB Port button on the GUI.

•Exit: Stops the program

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Basic Test Procedure

3 Basic Test Procedure

This section outlines the basic test procedure for testing the EVM.

3.1 Test Block Diagram

The test set-up for evaluation of the EVM with the TSW140x Capture Card is shown in Figure 6. As seen

in this figure, the evaluation setup involves a clock from a high-quality signal generator and a sine wave

for the analog input from a high-quality signal generator. High-order, narrow-bandpass filters are usually

required on clock and input frequency for removing phase noise and harmonic content from the input sine

waves. If the two signal generators are not synchronized by an external reference signal to make the clock

and input frequency coherent, then the resulting FFT first needs to have a windowing function such as

Hanning or Blackman-Harris applied to the data.

Figure 6. Test Setup Block Diagram

3.2 Test Set-up Connection

• Connect the J11 connector of the EVM to the J3 connector of TSW1400 or the J3 connector of

TSW1405

• Connect 5 V to the supply input of the TSW1400 and 5 V to the supply input of the EVM

• Provide sample clock at J1 of the EVM

• Provide analog input sine wave to Channel A, J4, or Channel B, J5

• Connect the USB cable from the TSW140x to a PC for the capture card GUI

• Connect the USB cable from the ADS540x to the computer if using the ADS540x SPI GUI

• Make sure the following jumpers at their default setting

– Initial jumper setting of ADS540x as per Table 1 (if default usage of the ADC is desired)

SLAU450–July 2012 ADS540x and ADS54T0x Evaluation Module (EVM)

Basic Test Procedure

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3.3 ADS540x Software Quick Start Guide

Figure 5 introduced the front panel of the ADS540x SPI GUI. This section covers the initial use of the SPI

GUI necessary for most evaluations of the ADS540x.

• Press the Reset USB Port button if the USB connection has been disrupted since the last use, or if an

error message pops up warning that the USB connection is not valid.

• Select the Reset position of the reset switch with the mouse. This switch is self-clearing.

• From this point, select digital functions such as test pattern modes, if desired. All commonly used

the SPI GUI for easy configuration of the ADS540x.

• In most applications, use the SPI GUI to enable the HP Mode 1.

• In most applications, use the SPI GUI to enable the Offset Correction for channel A and Channel B.

• For the ADS54T0x, use the SPI GUI to set burst length to something large enough that the TSW1400

capture will capture all 12-bit resolution data.

• Other GUI switches for Bias, Sync, or LP Mode should be left alone, in most cases.

Note that any greyed-out front panel switches are unavailable for use because they have a dependency

upon other switch settings. These functions must first be enabled by selection of a different switch, as

indicated in the ADS540x datasheet.

TSW140x Quick Start Operation

Reference the High Speed Data Converter Pro User’s Guide for more detailed explanations of the

TSW1400 or TSW1405 set-up and operation. This document assumes the High Speed Data Converter

Pro software is installed and functioning properly.

Single tone FFT test

• Select the ADS5402 as the TI ADC Device Selection. If this device does not appear in the device

selection, then the initialization file ADS5402.ini is missing from the ADC Files folder where the High

Speed Data Converter Pro User Interface is installed. Close the GUI, copy the ADS5402.ini file into the

ADC Files folder and relaunch the GUI.

• Select Single Tone FFT Test

• Select the number of sample points (and resulting number of FFT bins) to use.

• Enter the ADC sampling rate.

• Enter the input frequency desired. If the clock and input frequency signal generators are synchronized,

then make sure the checkbox for coherent frequency is checked and set the input frequency signal

generator to the input frequency displayed.

• Press the Capture button.

• Observe an FFT result similar to that of Figure 8.

• For the ADS54T0x, the TSW1400 may be used to source the trigger to the ADS54T0x EVM by using

the Trigger menu in the High Speed Data Converter Pro GUI as shown in Figure 7.

10 ADS540x and ADS54T0x Evaluation Module (EVM) SLAU450–July 2012

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