Texas Instruments ADS5240 Manual de usuario

ADS5240/5242 Evaluation Module

User's Guide

October 2005

SBAU116

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Contents
1 Features ..................................................................................................................... 52 Description ................................................................................................................. 53 Power Supplies ........................................................................................................... 54 Signals ...................................................................................................................... 54.1 External Reference ................................................................................................. 54.2 Input Signals ......................................................................................................... 54.3 Output Signals....................................................................................................... 54.4 Clock Signal ......................................................................................................... 55 Operation ................................................................................................................... 65.1 Pushbuttons and Indicator LEDs ................................................................................. 65.2 Serial Data In ........................................................................................................ 65.3 Accessing the Internal Registers ................................................................................. 65.4 Installing the Software .............................................................................................. 75.5 Using the Software ................................................................................................. 75.6 Custom Pattern Generation ....................................................................................... 95.7 LSB/MSB First Mode ............................................................................................... 96 Bill of Materials ........................................................................................................... 97 Schematic and PCB ................................................................................................... 11
SBAU116 – October 2005 Table of Contents 3

List of Figures

1 Evaluation Board Overview ................................................................................................. 62 Inital Setup Screen .......................................................................................................... 73 Register Access Program Screen ......................................................................................... 84 Register Access Program Screen – Custom Pattern Option ........................................................... 95 ADS5240/42EVM PCB – Top Layer ..................................................................................... 116 ADS5240/42EVM PCB – Ground Layer ................................................................................. 127 ADS5240/42EVM PCB – Power Layer .................................................................................. 128 ADS5240/42EVM PCB – Bottom Layer ................................................................................. 13

List of Tables

1 Component List ............................................................................................................. 10

List of Figures4 SBAU116 – October 2005

1 Features

2 Description

3 Power Supplies

4 Signals

4.1 External Reference

4.2 Input Signals

4.3 Output Signals

4.4 Clock Signal

User's GuideSBAU116 – October 2005

•Easy testing of the ADS5240/42 family of 12-bit data converters•Single-ended, transformer coupled inputs.•PC interface to control internal registers.

The ADS5240/42EVM is designed to provide ease of use in evaluating the performance of theADS5240/42 family of 12-bit analog to digital converters with LVDS outputs. When combined with theADSDeSer-50EVM, a complete evaluation of the ADS5240/42 family can be performed.

The ADS5240/42 EVM requires three supplies located on P3:•AVDD – 3.3V DUT analog supply•DVDD – 3.3V Digital supply for the microcontroller and RS232 level shifter•LVDD – 1.8V to 3.3V LVDS output driver supply

By default AVDD, DVDD, and LVDD are tied together using a ferrite bead for ease of use. To separate thesupplies, remove FB1, and FB2.

By default, the ADS5240/42 EVM defaults to an internally generated reference. However, by assertingSW3, the ADS5240/42 will use the REFT and REFB supplied on P2 as its references.

The input signals are applied to SMA connectors J2, J4, J7 and J9. The input signals are transformercoupled to the inputs of the ADC.

The LVDS outputs from the ADC are sent to P6. P6 is used to connect the ADS5240/42EVM to theADSDeSer-50EVM to provide a means to deserialize the data for external processing.

Enter a clean, low jitter, 3Vpp clock on J1. The maximum clock frequency should be with the aid of thedevice data sheet. Either a sinusoidal or square-wave clock input can be excepted.

SBAU116 – October 2005 5

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5 Operation

5.1 Pushbuttons and Indicator LEDs

Power

Connectors

DB9

Input Circuitry

ADS5240/42

Input Circuitry

Output Connector

Clock

Driver

Clock

SMA

Micro

RS232

−TTL

Green LED

SW3

SW2

SW1

Int/Ext Reference LED (on = Int)

Serial Interface (on = data)

Power Down LED (on = Powered Down)

Reset LED

Int/Ext Reference Select pushbutton

Power Down Puchbutton

Reset Pushbutton

5.2 Serial Data In

5.3 Accessing the Internal Registers

Operation

When power is applied to the board, the EVM performs an initialization sequence that sets the initialoperation of the ADS5240/42. The Ref LED lights up to signify that the Int/Ext (bar over Ext) reference isset to internal. The RST LED is illuminated while a reset pulse is provided to the ADS5240/42 to reset thedevice for proper operation. The EVM is now operational and if connected to the ADSDESer-50EVM andreset pushbutton is pressed on the deserializer board, parallel data should be available on each channeloutput and a clock should be present on the clock output.

The ADS5240/42EVM has three pushbuttons and four indicator LEDs. The pushbuttons and theircorresponding LEDs are defined as follows:•SW1 - RST - Reset of the ADS5240/42 device. (Resets only the ADS517x device)•SW2 – PD– Power Down of the device. (LED on signifies complete device in power down)•SW3 – Ref– Internal / External (bar over External) Reference Selection. (LED on signifies Internal)

The fourth LED, SDI, when illuminated signifies that data has been received from the PC through theserial link.

Figure 1. Evaluation Board Overview

The Serial Data In (DB-9) connector is used to connect the EVM to a PC for accessing the internalregisters of the ADS5240/42 device. This allows extended flexibility of the device beyond the simplepower-up mode.

The ADS5240/42 family has internal registers that offer flexibility to the end user. In order to facilitate theease of accessing these registers, the evaluation program is used. With the combination of a serial port ona PC, a serial link cable (provided), and the ADS5240/42EVM, the user has the ability to access theinternal registers on the ADS5240/42 family of data converters.

6 SBAU116 – October 2005

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5.4 Installing the Software

5.5 Using the Software

Operation

Installation of the software is straightforward. Insert the included CD or download the installation files fromthe Texas Instruments web site and double click on the Setup.exe file. This will install the program and allnecessary files to the PC. Once the installation process is complete go to the START > Programs > TexasInstruments> ADS524XEVM Software icon to start the program.

Note: The installation files are also available for download from the TI web site at www.ti.com .

After clicking on the ADS5240/42EVM_Software icon an initial startup screen will be displayed. The“Please select a Com port.” Dialog box will appear on top of the above screen.

Figure 2. Inital Setup Screen

Select OK and then select the proper COM port from the drop-down list. The program lists all availableCOM ports to choose from. Once a COM port is selected the main program window will open.

SBAU116 – October 2005 7

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Operation

Figure 3. Register Access Program Screen

The main program window allows the user access to the registers of the ADS5240/42 family. With thisprogram it is easy to change operating characteristics, send out test patterns, or power down any of thefour channels of the ADS5240/42 converter. The software also contains the ability to reset the ADSremotely from the PC in addition to the pushbutton on the EVM board itself.

Once again, the operation of the program is straightforward. Make your selection and press the Downloadbutton. The proper codes are then sent from the PC to the ADS5240/42EVM board. A software reset isprovided to reset all choices to their default values. To exit the program, selecting the Exit commandbutton or go to File menu and select Exit.

8 SBAU116 – October 2005

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5.6 Custom Pattern Generation

5.7 LSB/MSB First Mode

6 Bill of Materials

Bill of Materials

When using the custom pattern option all of the values are entered in a binary format (ie. 101011001111).

Figure 4. Register Access Program Screen – Custom Pattern Option

The default mode of data out of the ADS5240/42 device is LSB first. This mode can be changed byselecting the MSB First option in the software. This option increases the flexibility of the device.

Note: Changing to MSB First also reverses the internally generated test patterns and thecustom pattern. This will show up on the Register Access screen as blue text.

SBAU116 – October 2005 9

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Bill of Materials

Table 1. Component List

DESIGNATOR QTY PART NUMBER VENDOR PCB FOOTPRINT NOTES

C1 C3 C4 C14 C15 29 ECJ0EB1A104K Panasonic 0402 Do Not Install C45,C16 C18 C20 C22 C26 C50, C54, C58C27 C28 C31 C34 C36C39 C40 C41 C42 C43C44 C45 C46 C47 C49C50 C51 C53 C54 C55C57 C58 C59C2 C5 2 T491B225K016AS KEMET TANT_BC6 C9 C13 3 T491B475K016AS KEMET TANT_BC7 C8 C12 3 ECJ1VB1C104K Panasonic 0603C17 C19 C21 C23 C24 10 ECJ0EB1H102K Panasonic 0402C25 C29 C30 C32 C33C37 C38 C61 3 ECJ0EB1C103K Panasonic 0402C48 C52 C56 C60 4 ECJ0EC1H220J Panasonic 0402CR1 CR2 CR3 CR4 4 SML-LX1206GC-TR LUMEX LED_1206FB1 FB2 2 RXC-ML32A680U Panasonic 1206J1 J2 J3 J4 J5 J6 J7 5 142-0701-201 Johnson Components SMA_THVT_320x320 Do Not Install J3, J5,J8 J9 J6, J8P1 1 102203-3 Tyco/AMP CON_THRT_1x6_100_

MP2 1 AK550-3 ALTECH CORP TERM_BLOCK_3_138P3 1 AK550-4 ALTECH CORP TERM_BLOCK_4_138P5 1 DEKL-9SAT-F CINCH CON_THRT_DB_9_M

_2P6 1 QTH-040-01-F-D-DP-A SAMTECR1 R4 R14 R15 R16 6 CRCW0402000RF Vishay/Dale 0402 Do Not Install R4, R15,R19 R20 R22 R24 R25 R19, R20, R24, R25,R27 R29 R30 R32 R29, R30R2 1 CRCW04025622F Vishay/Dale 0402R5 R6 2 9C04021A2R00JGHF3 Yageo America 0402R7 R8 R9 R10 4 CRCW0402332RF Vishay/Dale 0402R11 R12 R13 3 CRCW04024751F Vishay/Dale 0402R17 1 ERJ-2RKF49R9X Panasonic 0402R34 1 ERJ-2RKF54R9X Panasonic 0402R35 R36 R37 R38 R39 16 ERJ3EKF49R9V Panasonic 0603R40 R41 R42 R43 R44R45 R46 R47 R48 R49R50

R51 R52 R53 3 ERJ-2RKF4990X Panasonic 0402SW1 SW2 SW3 3 EVQ-PJB04K Panasonic SW_THVT_SPST_2T1 T2 T3 T4 4 TRANS_SMVT_CD542 Minicircuits ADT2-1T_6U1 1 SSOP_16_256x221_2 Maxim MAX3221CDB6U2 0 SSOP_20_289X212_2 CYPRESS CY8C27243-24PVXI See Note 26U3 1 SSOP_8_124X114_26 ON MC100EPT21DTSEMICONDUCTORU4 0 Texas Instruments See Note 1NA 4 Richo Inc. SRS4-8-01 1/2" Stand offs

10 SBAU116 – October 2005

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