SSW-105-22-F-DVS-K_技术文档

User's Guide

SLAU262C–January 2009–Revised May 2011

ADS79xxEVM and ADS79xxEVM-PDK

Figure 1. ADS7953EVM (Left) and ADS7953EVM-PDK (Right)

This users guide describes the characteristics, operation, and use of the ADS7953EVM, ADS7957EVM

and ADS7961EVM, both by themselves and as part of the ADS7953EVM-PDK, ADS7957EVM-PDK or

ADS7961EVM-PDK. These evaluation modules (EVMs) are evaluation boards for the ADS7953, a 12-bit,

16-channel, successive approximation register (SAR) analog-to-digital converter (ADC), and the ADS7957

and ADS7961, which are 10-bit and 8-bit variations of the ADS7953. The EVM allows evaluation of all

aspects of the ADS7953, ADS7957 or ADS7961 device. Complete circuit descriptions, schematic

diagrams, and bills of material are included in this document.

The following related documents are available through the Texas Instruments website at http://www.ti.com.

ADCPro is a trademark of Texas Instruments.

Microsoft, Windows XP are registered trademarks of Microsoft Corporation.

I²C is a trademark of NXP Semiconductors.

All other trademarks are the property of their respective owners.

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Contents

1

2

3

4

5

6

7

8

9

EVM Overview ............................................................................................................... 3

Analog Interface ............................................................................................................. 4

Digital Interface .............................................................................................................. 5

Power Supplies .............................................................................................................. 6

Voltage Reference .......................................................................................................... 6

EVM Operation .............................................................................................................. 6

ADS7953EVM-PDK Kit Operation ........................................................................................ 8

Evaluating Performance with the ADCPro Software .................................................................. 19

Schematic and Bill of Materials .......................................................................................... 26

List of Figures

1

ADS7953EVM (Left) and ADS7953EVM-PDK (Right) .................................................................

ADS7953EVM Default Jumper Locations................................................................................

MMB0 Initial Setup .........................................................................................................

1

7

9

2

3

4

Connecting an AC Adapter............................................................................................... 10

Laboratory Power-Supply Connection .................................................................................. 11

NI-VISA Driver Installation ............................................................................................... 12

NI-VISA Driver Installation Question ................................................................................... 12

NI-VISA Driver Installing ................................................................................................. 13

NI-VISA Driver Complete Installation .................................................................................. 13

NI-VISA Driver Verification Using Device Manager .................................................................. 14

ADCPro Software Start-up Display Window ........................................................................... 14

ADS7953EVM-PDK Plug-In Display Window.......................................................................... 15

Install New Driver Wizard Screen 1..................................................................................... 16

Install New Driver Wizard Screen 2..................................................................................... 16

Install New Driver Wizard Screen 3..................................................................................... 17

Install New Driver Wizard Screen 4..................................................................................... 17

Install New Driver Wizard Screen 5..................................................................................... 18

USBSytx Driver Verification Using Device Manager ................................................................. 18

Channel Enable............................................................................................................ 20

Manual Channel Control.................................................................................................. 21

Serial Clock, Input Range and MS Nibble settings ................................................................... 22

High and Low Alarm Limits by Channel ................................................................................ 23

GPIO and System Monitor Control options ............................................................................ 24

GPIO selection, controls and indicators ................................................................................ 25

Progress Bar While Collecting Data .................................................................................... 26

ADS7953EVM Schematic ................................................................................................ 27

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List of Tables

1

2

3

4

5

6

7

EVM-Compatible Device Data Sheets ...................................................................................

Primary Analog Interface Pinout ..........................................................................................

Secondary Analog Interface Pinout.......................................................................................

Serial Interface Pins ........................................................................................................

P3 Configuration: Power-Supply Input ...................................................................................

List of Jumpers ..............................................................................................................

3

4

5

6

7

ADS7953EVM Bill of Materials .......................................................................................... 28

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EVM Overview

1

EVM Overview

Table 1. EVM-Compatible Device Data Sheets

Device

Literature Number

ADS7953, ADS7952, ADS7951, ADS7950, ADS7957, ADS7956,

ADS7955, ADS7954, ADS7961, ADS7960, ADS7959, ADS7958

SLAS605

OPA365

SBOS365

SBOS410

REF5025

1.1 Features

ADS7953EVM/ADS7957EVM/ADS7961 EVM Features:

•

Contains all support circuitry needed for the ADS7953/ADS7957/ADS7961

Voltage reference options: external or onboard

Buffer options: onboard analog input buffer can be bypassed

GPIO access with HI or LO alarm options to interrupt host processor

Compatible with the TI Modular EVM System

ADS7953EVM/ADS7957EVM/ADS7961EVM-PDK Features:

®

•

Easy-to-use evaluation software for Microsoft Windows XP

Data collection to text files

Built-in analysis tools including scope, FFT, and histogram displays

Complete control of board settings

Easily expandable with new analysis plug-in tools from Texas Instruments

For use with a computer, the ADS79xxEVM Performance Demonstration Kit (PDK) is available. This kit

combines the ADS7953EVM, ADS7957EVM or ADS7961EVM board with the TMS320VC5507

DSP-based MMB0 motherboard, and includes ADCPro™ software for evaluation.

The MMB0 motherboard allows the ADS79xxEVM to be connected to the computer via an available USB

port. This manual shows how to use the MMB0 as part of the ADS79xxEVM-PDK, but does not provide

technical details about the MMB0 itself.

ADCPro is a program for collecting, recording, and analyzing data from ADC evaluation boards. It is based

on a number of plug-in programs, so it can be expanded easily with new test and data collection plug-ins.

The ADS79xxEVM-PDK is controlled by a plugin running in ADCPro. For more information about ADCPro,

see the ADCPro Analog-to-Digital Converter Evalutation Software Users Guide, available for download

from the TI website.

This manual covers the operation of all three ADS7953, ADS7957 and ADS7961 devices refered to as the

ADS79xxEVM and the ADS79xxEVM-PDK. Throughout this document, the abbreviation EVM and the term

evaluation module are synonymous with the ADS79xxEVM. For clarity of reading, the rest of this manual

will refer only to the ADS7953EVM or ADS7953EVM-PDK. The individual kit contains one ADS7953EVM,

ADS7957EVM or ADS7961EVM, but operation of the EVM and kit for the ADS7957 or ADS7961 is

identical, unless otherwise noted.

1.2 Introduction

The ADS7953EVM is an evaluation module built to the TI Modular EVM System specification. It can be

connected to any of the modular EVM system interface cards available from Texas Instruments.

The ADS7953EVM is available as a stand-alone printed circuit board (PCB) or as part of the

ADS7953EVM-PDK, which includes an MMB0 motherboard and software. As a stand-alone PCB, the

ADS7953EVM is useful for prototyping designs and firmware.

Note that the ADS7953EVM has no microprocessor and cannot run software. To connect it to a computer,

some type of host processor interface capable of generating the necessary control signals is required.

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Analog Interface

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2

Analog Interface

For maximum flexibility, the ADS7953EVM is designed for easy interfacing to multiple analog sources.

Samtec part numbers SSW-110-22-F-D-VS-K and TSM-110-01-T-DV-P provide a convenient 10-pin,

dual-row, header/socket combination at P1. This header/socket provides access to the analog input pins

associated with CH0-CH7 of the ADS7953. Consult Samtec at http://www.samtec.com or call

1-800-SAMTEC-9 for a variety of mating connector options. Samtec part number TMS-108-02-G-D

provides access to analog input channels CH8-CH15 at J1.

Most of the pins on P1 and J1 are directly connected to the ADS7953 using a simple R/C filter with no

additional overvoltage protection circuitry. Use appropriate caution when handling these pins. Table 2 and

Table 3 summarize the pinouts for analog interfaces P1 and J1, respectively.

Table 2. Primary Analog Interface Pinout

Pin Number

P1.2

Signal

CH7

CH6

CH5

CH4

CH3

CH2

CH1

CH0

Description

CH7 input

CH6 input

CH5 input

CH4 input

CH3 input

CH2 input

CH1 input

CH0 input

P1.4

P1.6

P1.8

P1.10

P1.12

P1.14

P1.16

External reference source input (– side of

differential input)

P1.18

P1.20

EXTREFN

EXTREFP

External reference source input (+ side of

differential input)

J9.15

Unused

AGND

—

P1.1-19 (odd)

Analog ground connections (except J1.15)

Table 3. Secondary Analog Interface Pinout

Pin Number

J1.2

Signal

CH15

CH14

CH13

CH12

CH11

CH10

CH9

Description

CH15 input

J1.4

CH14 input

J1.6

CH13 input

J1.8

CH12 input

J1.10

CH11 input

J1.12

CH10 input

J1.14

CH9 input

J1.16

CH8

CH8 input

J1.1-15 (odd)

AGND

Analog ground connections

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Digital Interface

3

Digital Interface

3.1 Serial Data Interface

The ADS7953EVM is designed to easily interface with multiple control platforms. Samtec part numbers

SSW-110-22-F-D-VS-K and TSM-110-01-T-DV-P provide a convenient 10-pin, dual-row, header/socket

combination at P2. This header/socket provides access to the digital control and serial data pins of the

ADC. Consult Samtec at http://www.samtec.com or call 1-800-SAMTEC-9 for a variety of mating

connector options.

Table 4 describes the P2 serial interface pins.

Table 4. Serial Interface Pins

Pin No.

Pin Name

Signal Name

I/O Type

Pullup

Function

P2.1

CNTL

CS

In

None

Controls CS input, Jumper

option with P2.7 via W5

P2.2

P2.3

P2.4

P2.5

P2.6

P2.7

GPIO0

CLKX

DGND

CLKR

GPIO1

FSX

GPIO2

SCLK

In/Out

In

High

None

High

GPIO

ADS79xx serial clock

Digital Ground

serial clock return to DSP

GPIO

DGND

NA

CLKR

Out

In/Out

In

GPIO3

FSYNC Xmit

None

Controls CS input, Jumper

option with P2.1 via W5

P2.8

P2.9

GPIO2

FSR

Unused

FSYNC rtrn

DGND

NA

Out

NA

None

NA

P2.10

P2.11

P2.12

P2.13

P2.14

P2.15

P2.16

P2.17

P2.18

P2.19

P2.20

DGND

DX

Digital Ground

DIN

In

ADS79xx SPI data in

GPIO3

DR

Unused

DOUT

NA

Out

NA

None

NA

ADS79xx data out

GPIO4

/INT

Unused

GPIO0/GPIO1

SCL

Out

I²C ™

NA

None

n/a

Hi/Lo Alarm Interrupt options

I²C clock

SCL

TOUT

DGND

GPIO5

SDA

Unused

DGND

NA

None

NA

Digital Ground

I²C data

Unused

SDA

NA

I²C

n/a

3.2 Data Output

All output data communications are directed through DOUT. The data from all 16 channels can be

observed on the DOUT pin. This is the signal that is used by the ADS7953EVM-PDK to read back and

display all the channel data via the ADCPro software.

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4

Power Supplies

P3 is the power-supply input connector. Table 5 lists the configuration details for P3. Only +5V analog and

+5V digital is required to power the EVM. If desired, a jumper option (W6) is provided to supply the

ADS7953 digital core with +3.3V.

Table 5. P3 Configuration: Power-Supply Input

Pin No.

J3.1

Pin Name

+VA

Function

+10V to +15V

Required

No

J3.2

–VA

–10V to –15V

No

J3.3

+5VA

+5V analog supply

–5V analog supply

Digital ground input

Analog ground input

1.8V digital supply

Not used

Always

No

J3.4

–5VA

J3.5

DGND

AGND

+1.8VD

VD1

Yes

No

J3.6

J3.7

J3.8

No

J3.9

+3.3VD

+5VD

3.3V digital supply

+5V

Yes, if +5VD is not used

Yes, if +3.3VD is not used

J3.10

The ADS7953 digital section can be powered from +3.3V or +5V by means of jumper option W6.

5

6

Voltage Reference

The ADS7953EVM has three sources for the reference voltage. Jumper W2 can select the REFP voltage

from either the REF5025(U3) or from an external source applied to P1.18. Jumper W3 can select the

REFM voltage from either the analog ground (AGND) or from an external source applied to P1.20.

EVM Operation

The following section provides information on the analog input, digital control, and general operating

conditions of the ADS7953EVM.

6.1 Analog Input

Eight of the analog input sources (channels 0-7) can be applied directly to P1 (top or bottom side) or

through signal-conditioning modules available for the modular EVM system. The additional eight channel

sources (CH8-CH15) can be applied to connector J1. The analog input range on the EVM is identical to

that of the installed device and is dependent on the RANGE setting of the ADC (0 to 5V or 0 to 2.5V)

Each input signal can be configured to connect directly to the analog inputs of the ADS7953 through a

33Ω series resistor with an 0.027pF capacitor to AGND. The input to CH0 can use the OPA365 buffer that

is provided (default condition, W4 jumpered pins 1-2). Jumper W4 can be placed on pins 2-3 to bypass

the unity gain buffer configuration of the OPA365.

6.2 Digital Control

The digital control signals can be applied directly to P5 (top or bottom side). The modular ADS7953EVM

can also be connected directly to a DSP or microcontroller interface board, such as the 5-6KInterface or

HPA-MCUInterface boards available from Texas Instruments. When purchased as part of a PDK, the

ADS7953EVM can be controlled by the MMB0. For a list of compatible interface and/or accessory boards

for the EVM or the ADS7953, see the relevant product folder on the TI website. All of the digital signals

are controlled directly with pins on P2.

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EVM Operation

6.3 ADS7953EVM-PDK Power Supply

The analog portion of the ADS7953EVM can either be powered by a 5V source generated via ac adapter

or by applying the +5VA to the connector on the MMB0 board. The MMB0 board will provide the digital 5V

and 3.3V to the ADS7953EVM. To provide +5VA to the ADS7953EVM from the MMB0 board, make sure

the jumper at J13 (on the MMB0) is closed from +5V to +5VA.

6.4 Default Jumper Settings

Figure 2 shows the jumpers found on the EVM and the respective factory default conditions for each.

Figure 2. ADS7953EVM Default Jumper Locations

Table 6 lists the jumpers found on the EVM and the respective factory default conditions for each.

Table 6. List of Jumpers

Switch

Default Position

Switch Description

W1

Open

W1 is not installed in production boards

W2 selects the REFP source, onboard (default) or external via

P1.18

W2

W3

W4

Short 1-2

W3 selects the REFM source, AGND (default) or external via

P1.20

W4 selects the CH0 input configuration, buffered (default) or

bypassed

W5 selects the CS source on the ADS7953, FSX (default) or

CNTL

W5

W6

W7

Short 1-2

W6 selects the DV_DDVoltage, +5VD (default) or +3.3VD

W7 selects the host processor interrupt source, GPIO1 (default)

or GPIO0

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7

ADS7953EVM-PDK Kit Operation

This section provides information on using the ADS7953EVM-PDK, including setup, program installation,

and program usage.

To prepare to evaluate the ADS7953 with the ADS7953EVM-PDK, complete the following steps:

Step 1. Install the ADCPro software (if not already installed) on a PC.

Step 2. Install the ADS7953EVM-PDK EVM plug-in software.

Step 3. Set up the ADS7953EVM-PDK.

Step 4. Connect a proper power supply or use the included AC adapter.

Step 5. Complete the NI-VISA USB driver installation process.

Step 6. Run the ADCPro software.

Step 7. Complete the Microsoft Windows USB driver installation process.

Each task is described in the subsequent sections of this document.

7.1 Installing the ADCPro Software

CAUTION

Do not connect the ADS7953EVM-PDK before installing the software on a

suitable PC. Failure to observe this caution may cause Microsoft Windows to

not recognize the ADS7953EVM-PDK.

The latest software is available from the TI website at http://www.ti.com/. The ADCPro installer will check

for updates when executed (if connected to the Internet), and then gives the option of downloading and

installing the latest version. See the ADCPro Analog-to-Digital Converter Evalutation Software Users

Guide for instructions on installing and using ADCPro.

To install the ADS7953EVM-PDK plug-in, run the file: ads7953evm-pdk-plugin-1.1.0.exe (1.1.0 is the

version number, and increments with software version releases). Double-click the file to run it; then follow

the instructions shown. Also, use the ADCPro Update Check feature to check for newer versions of the

ADS7953EVM-PDK plug-in, once one version has been installed.

The software should now be installed, but the USB drivers may not have been loaded by the PC operating

system. This step will complete when the ADCPro software is executed.

7.2 Setting Up the ADS7953EVM-PDK

The ADS7953EVM-PDK contains both the ADS7953EVM and the MMB0 motherboard; however, the

devices are shipped unconnected. Follow these steps to set up the ADS7953EVM-PDK:

Step 1. Unpack the ADS7953EVM-PDK kit.

Step 2. Set the jumpers and switches on the MMB0 as shown in Figure 3.

•

Set the Boot Mode switch to USB.

Connect +5V and +5VA on jumper block J13 (if +5V is supplied from J14 +5VA).

Leave +5V and +VA disconnected on jumper block J13.

If the PDK will be powered from an ac adapter, connect J12. If the PDK will be powered through the

terminal block, disconnect J12 (see Section 7.3 of this document for additional power supply

connection details).

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ADS7953EVM-PDK Kit Operation

Figure 3. MMB0 Initial Setup

Step 3. Plug the ADS7953EVM into the MMB0. The female portion of P1, P2 and P3 on the EVM align

with male connectors J7, J4 and J5 respective on the MMB0.

CAUTION Do not misalign the pins when plugging the ADS7953EVM into the MMB0. Check the pin

alignment of P1, P2, and P3 carefully before applying power to the PDK.

Step 4. Verify the jumpers on the ADS7953EVM are as shown in Figure 2 (note that these settings are the

factory-configured settings for the EVM).

7.2.1

About the MMB0

The MMB0 is a Modular EVM System motherboard. It is designed around the TMS320VC5507, a DSP

with an onboard USB interface from Texas Instruments. The MMB0 also has 16MB of SDRAM installed.

The MMB0 is not intended to be used as a DSP development board, and it is not available separately. TI

cannot offer support for the MMB0 except as part of an EVM-PDK kit. For schematics or other information

about the MMB0, contact Texas Instruments.

7.3 Connecting the Power Supply

The ADS7953EVM-PDK can be operated with a unipolar +5V supply or a combination of +5V and +3.3V

supplies.

When the MMB0 DSP is powered properly, LED D2 glows green. The green light indicates that the 3.3V

supply for the MMB0 is operating properly. (It does not indicate that the EVM power supplies are

operating properly.)

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7.3.1

Connecting an AC Adapter

An ac adapter can be connected to barrel jack J2 on the MMB0. J2 is located next to the USB connector.

The adapter must output 6V-7V dc. The connector must be sleeve-negative, tip-positive. It should have a

current rating of at least 2A.

Jumper J12 on the MMB0 connects a wall-mounted power supply to the board. To use the wall-mount

supply, J12 must be shorted. Figure 4 illustrates how to connect an ac adapter to the MMB0.

Figure 4. Connecting an AC Adapter

Connecting a Laboratory Power Supply

7.3.2

A laboratory power supply can be connected through terminal block J14 on the MMB0, as shown in

Figure 5.

To use a unipolar lab power supply configuration:

•

Disconnect J12 on the MMB0.

Connect a +5V dc supply to the +5VD terminal on J14.

Connect ground of the dc supply to the GND terminal on J14.

It is not necessary to connect a +5V dc supply voltage to the +5VA terminal on J14 if the +5V/+5VA

position on J13 is shorted.

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ADS7953EVM-PDK Kit Operation

Figure 5. Laboratory Power-Supply Connection

7.4 Running the Software and Completing Driver Installation

Note: The software is continually under development. These instructions and screen images are current at

the time of this writing, but may not exactly match future releases.

The program for evaluating the ADS7953EVM-PDK is called ADCPro. This program uses plug-ins to

communicate with the EVM. The ADS7953EVM-PDK plug-in is included in the ADS7953EVM-PDK

package.

The program currently runs only on Microsoft Windows platforms of Windows XP; Windows Vista is NOT

supported at the time of this writing.

If this is the first time installing ADCPro and the EVM plug-ins, follow these procedures to run ADCPro and

complete the necessary driver installation.

7.4.1

NI-VISA USB Device Driver Installation

1. After the ADCPro software is installed, apply power to the PDK and connect the board to an available

PC USB port.

2. The computer should recognize new hardware and begin installing the drivers for the hardware.

Figure 6 through Figure 10 are provided for reference to show the installation steps.

•

For the first screen, Figure 6, it is not necessary to search for the software; it has already been

installed to the PC.

•

For the remaining steps, accept the default settings.

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Figure 6. NI-VISA Driver Installation

Figure 7. NI-VISA Driver Installation Question

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Figure 8. NI-VISA Driver Installing

Figure 9. NI-VISA Driver Complete Installation

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This procedure should complete the installation of the NI-VISA drivers. Verify the proper installation by

opening the Device Manager and locating as shown in Figure 10.

Figure 10. NI-VISA Driver Verification Using Device Manager

Once ADCPro is installed, install the ADS7953EVM-PDK software to allow ADCPro to recognize the

evaluation board.

7.4.2

USBStyx Driver Installation

Start the software by selecting ADCPro from the Windows Start menu. The screen in Figure 11 appears.

Figure 11. ADCPro Software Start-up Display Window

1. Select ADS7953EVM from the EVM drop-down menu. The ADS7953EVM-PDK plugin appears in the

left pane, as shown in Figure 12.

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ADS7953EVM-PDK Kit Operation

Figure 12. ADS7953EVM-PDK Plug-In Display Window

2. The ADS7953EVM-PDK plug-in window has a status area at the top of the screen. When the plug-in is

first loaded, the plug-in searches for the board. The user will see a series of messages in the status

area indicating this action.

3. If the operating system drivers have not been loaded, Windows will display the Windows Install New

Driver Wizard sequence (illustrated in Figure 13 through Figure 17). Accept the default settings.

•

NOTE: During the driver installation, a message may appear indicating the firmware load has

TIMED OUT. Click OK and continue driver installation. The plug-in will attempt to download the

firmware again once the driver installation completes.

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Figure 13. Install New Driver Wizard Screen 1

Figure 14. Install New Driver Wizard Screen 2

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ADS7953EVM-PDK Kit Operation

Figure 15. Install New Driver Wizard Screen 3

Figure 16. Install New Driver Wizard Screen 4

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Figure 17. Install New Driver Wizard Screen 5

4. Once Windows finishes installing the software driver, the plug-in downloads the firmware to the MMB0.

The status area will display Connected to EVM when the device is connected and ready to use. If the

firmware does not load properly, try resetting the MMB0 by pressing reset and then reloading the

plug-in.

5. Verify the proper installation of the USBStyx driver using the Device Manager. Note that the first driver

item, NI-VISA USB Devices, will disappear and a new item, LibUSB-Win32 Devices will appear, as

Figure 18 shows.

Figure 18. USBSytx Driver Verification Using Device Manager

The driver installation wizard sequence should not appear again, unless the board is connected to a

different USB port.

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Evaluating Performance with the ADCPro Software

8

Evaluating Performance with the ADCPro Software

The evaluation software is based on ADCPro, a program that operates using a variety of plug-ins. (The

ADS7953EVM plug-in is installed as described in the previous section.)

To use ADCPro, load an EVM plug-in and a test plug-in. To load an EVM plug-in, select it from the EVM

menu. To load a test plug-in, select it from the Test menu. To unload a plug-in, select the Unload option

from the corresponding menu.

Only one of each kind of plug-in can be loaded at a time. If selecting a different plugin, the previous plugin

is unloaded.

8.1 Using the ADS7953EVM-PDK Plug-in

The ADS7953EVM-PDK plug-in for ADCPro provides complete control over all settings of the ADS7953. It

consists of a tabbed interface (see Figure 19), with different functions available on different tabs. These

controls are described in this section.

The user can adjust the ADS7953EVM settings when not acquiring data. During acquisition, all controls

are disabled and settings may not be changed.

When a setting is changed on the ADS7953EVM plug-in, the setting immediately updates on the board.

Settings on the ADS7953EVM correspond to settings described in the ADS7953 product data sheet; see

the ADS7953 data sheet for details.

Because the effective sampling rate of the ADS7953 depends upon settings of the Clock Freq and the

number of channels being sampled, the Sampling Rate indicator in the upper right corner of the plug-in

interface is always visible and updates whenever a setting changes that affects the effective 'per-channel'

sampling rate.

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8.1.1

Channel Tab

The ADS7953 can acquire from one to sixteen channels sequentially or in a user defined pattern. The

Channel Tab (as shown in Figure 19) provides the control to turn each channel on or off. By default,

manual channel mode is enabled. In manual mode, any single channel may be selected for conversion.

Figure 19. Channel Enable

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In addition, the Manual Control button (shown in Figure 20) can be used to enable or disable auto scan

modes 1 and 2. Auto 1 Mode allows the selection of any number of channels from the channel selection

list. Auto 2 Mode allows the selection of the highest channel to convert. All channels below this will be

converted once this selection is made by pressing the 'Accept Selection' button.

Figure 20. Manual Channel Control

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8.1.2

Other Tab

The ADS7953 requires a clock to operate. The maximum frequency is selected by default for the different

operating modes, providing the maximum 1MSPS throughput rate specified in the datasheet.

The clock setting can be modified in this tab by accepting the default SPI or clock stop mode, a

continuous clock mode with the fastest possible serial clock, or a continuous clock mode with a variable

frequency.

The analog input range can also be specified in this tab as well as the contents of the four MSBs of

channel data (GPIO status or Channel Address of the conversion results).

Figure 21. Serial Clock, Input Range and MS Nibble settings

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8.1.3

Alarm Tab

The ADS7953 offers configurable alarm outputs for both high and low alarm selections. The configuration

of the alarm function takes place in two steps, the first of which is the setting of the alarm limits. In the

Alarm Tab, the hex values for high and low limits are entered for each channel requiring the alarm

function. To enable the alarm functions, the GPIO Function tab must be considered next.

Figure 22. High and Low Alarm Limits by Channel

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8.1.4

GPIO Function Tab

The GPIO0, GPIO1, GPIO2 and GPIO3 pins on the ADS7953 can function as simple general purpose

inputs/outputs or as specialized control and monitor functions. The alarm function described in the

previous section is processed by GPIO0 and GPIO1. Refer to the data sheet for specific details on GPIO0

and GPIO1 options. GPIO2 can be used to configure the input range of the ADS7953 (2.5V max or 5.0V

max), and GPIO3 can be used as a power down input pin.

Figure 23. GPIO and System Monitor Control options

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8.1.5

GPIO Tab

The GPIO Tab provides a means to monitor and control GPIO functions. If a GPIO is selected in the GPIO

Function tab to perform a specialized function, it will appear 'grayed out' in the GPIO tab. For pins

configured as GP outputs, a push button will enable the user to set the desired output state. GP Inputs are

monitored with an LED display (bright green = logic high).

Figure 24. GPIO selection, controls and indicators

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8.1.6

Collecting Data

Once the user has configured the ADS7953 for the test scenario, press the ADCPro Acquire button to

start the collection of the number of datapoints specified in the Test plug-in Block Size control. The

ADS7953EVM-PDK plug-in disables all the front panel controls while acquiring, and displays a progress

bar as shown in Figure 25.

Figure 25. Progress Bar While Collecting Data

For more information on testing analog-to-digital converters in general and using ADCPro and Test

plug-ins, refer to the ADCPro Analog-to-Digital Converter Evalutation Software Users Guide.

8.2 Troubleshooting

If ADCPro stops responding while the ADS7953EVM-PDK is connected, try unplugging the power supply

from the PDK. Unload and reload the plug-in before reapplying power to the PDK.

9

Schematic and Bill of Materials

Complete schematics for the ADS7953EVM are appended to this user guide. The bill of materials is

provided in Table 7. Gerber files are available on request. Please e-mail support@ti.com and ask for

details on how to receive the files.

26

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Schematic and Bill of Materials

7

4

1

3

5

7

9

2

4

6

8

0 1

Figure 26. ADS7953EVM Schematic

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Schematic and Bill of Materials

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9.1 Bill of Materials

Note: All components should be compliant with the European Union Restriction on Use of Hazardous

Substances (RoHS) Directive. Some part numbers may be either leaded or RoHS. Verify that purchased

components are RoHS-compliant. (For more information about TI's position on RoHS compliance, see the

TI website.)

Table 7. ADS7953EVM Bill of Materials

Item No.

Qty

Ref Des

Description

Vendor

Part Number

1

N/A

Printed Wiring

Board

TI

2

3

4

0

C15

Not Installed

R11 R14 R24

16

C1 - C14 C22 C24 CAP CER 270PF

50V C0G 5% 0603

TDK

C1608C0G1H271J

C1608X7R1E104K

ECJ-1VB0J106M

5

6

4

6

C16 C19 C23 C25 CAP CER 0.10UF

25V X7R 10% 0603

C17 C18 C21 C26 CAP CERAMIC

Panasonic

C27

10UF 6.3V X5R

0603

7

4

C20 C28 C29 C30 CAP CER 1.0UF

16V X7R 0603

Taiyo Yuden

EMK107B7105KA-T

8

9

1

2

J1

J2

8X2X.1 Header

2X2X.1 Header

Samtec

TMS-108-02-G-D

TMS-102-02-G-S

10

P1 P2 (top side)

10 Pin, Dual Row,

SMT Header (20 P

TSM-110-01-T-DV-

P

11

12

13

14

2

1

P1B P2B (bottom 10 Pin, Dual Row,

Samtec

Yageo

SSW-110-22-F-D-

VS-K

side)

SMT Socket (20 P

P3 (top side)

5 Pin, Dual Row,

TSM-105-01-T-DV-

P

SMT Header (10 Po

1

P3B (bottom side) 5 Pin, Dual Row,

SMT Socket (10 Po

SSW-105-22-F-D-

VS-K

19

R1 - R10 R13 R15 - RES 33.0 OHM

RC0603FR-0733RL

RC0603JR-070RL

RC0603FR-0710RL

1/10W 1% 0603

SMD

15

16

17

1

2

R12

R22

RES 0.0 OHM

1/10W 5% 0603

SMD

Yageo

RES 10.0 OHM

1/10W 1% 0603

SMD

R25 R26

RES 47.5K OHM

1/10W 1% 0603

SMD

RC0603FR-

0747K5L

18

19

3

2

TP1 TP2 TP3

GND GND

TEST POINT PC

MINI .040D RED

Keystone

5001

5011

TEST POINT PC

MULTI PURPOSE

BLK

20

21

1

U1

U2

2.2V, 50MHz,

Low-Noise,

Single-Sup

TI

OPA365AID

12/10/8-Bit, 1

MSPS,

ADS7953/52/51/50

16/12/8/4-Cha

22

23

1

U3

U4

Low-Noise, Very

Low Drift, Precisi

TI

REF5025ID

IC SERIAL

Microchip

24LC256T-I/SN

EEPROM 256K

2.5V 8-SOIC

28

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Revision History

Table 7. ADS7953EVM Bill of Materials (continued)

Item No.

Qty

0

Ref Des

W1

Description

Not Installed

3 Pin , 2mm Header

Vendor

Samtec

Part Number

TMS-102-02-G-S

TMM-103-01-T-S

24

25

6

W2 - W7

Revision History

Changes from B Revision (March, 2011) to C Revision ................................................................................................. Page

•

Updated Table 5 .......................................................................................................................... 6

NOTE: Page numbers for previous revisions may differ from page numbers in the current version.

29

SLAU262C–January 2009–Revised May 2011

Revision History

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型号：	SSW-105-22-F-DVS-K
厂家：	TEXAS INSTRUMENTS
描述：	Contains all support circuitry needed 包含所需的所有支持电路
文件：	总32页 (文件大小：1519K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

SSW-105-22-F-DVS-K [TI]

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