Analog Devices EVAL-AD7276SDZ Manuel utilisateur

Evaluation Board User Guide

UG-xxx-AD7276

One Technology Way •P. O. Box 9106 •Norwood, MA 02062-9106, U.S.A. •Tel: 781.329.4700 •Fax: 781.461.3113 •www.analog.com

Evaluating the AD7276

PLEASE SEE THE LAST PAGE FOR AN IMPORTANT

WARNING AND LEGAL TERMS AND CONDITIONS.Rev. PrA | Page 1 of 28

Full-featured evaluation board for the AD7276

PC control in conjunction with the System Demonstration

Platform (EVAL-SDP-CB1Z)

PC software for control and data analysis (time and

frequency domain)

Standalone capability

EVAL-AD7276SDZ KIT CONTENTS

EVAL-AD7276SDZ Evaluation Board

Evaluation Software CD for the AD7276

9V Mains power supply adapter

ADDITIONAL EQUIPMENT NEEDED

System Demonstration platform (EVAL-SDP-CB1Z)

Precision Analog signal source

SMB cables

USB Cables

EVALUATION BOARD DESCRIPTION

The E VA L -AD7276SDZ is a full-featured evaluation board,

designed to allow the user to easily evaluate all features of the

AD7276. The evaluation board can be controlled via the system

demonstration platform (SDP) connector (J8). The EVAL-SDP-

CB1Z board allows the evaluation board to be controlled via the

USB port of a PC using the AD7276 evaluation software.

The E VA L -AD7276SDZ generates all required power supplies

on board and supplies power to the EVAL-SDP-CB1Z controller

board.

On-board components include the:

•AD8022: Dual High Speed, Low Noise Op Amp

•ADA4000-1: Single, Low Cost, Precision JFET Input

Operational Amplifier

•AD780: 2.5 V/3.0 V Ultrahigh Precision Bandgap

Voltage Reference

•ADP1613: Step-Up PWM DC-to-DC Switching

Converter,

•ADP1720: 50 mA, High Voltage, Micropower Linear

Regulator

•ADP7104: 20 V, 500 mA, Low Noise, CMOS LDO

ADM1185: Quad Voltage Monitor and Sequencer

•ADG3308: Low Voltage, 1.15 V to 5.5 V, 8-Channel

Bidirectional Logic Level Translator

Various link options are described in the Evaluation Board

Hardware section.

Evaluation Board User Guide

UG-xxx-AD7276

One Technology Way •P. O. Box 9106 •Norwood, MA 02062-9106, U.S.A. •Tel: 781.329.4700 •Fax: 781.461.3113 •www.analog.com

Evaluating the AD7276

PLEASE SEE THE LAST PAGE FOR AN IMPORTANT

WARNING AND LEGAL TERMS AND CONDITIONS.Rev. PrA | Page 2 of 28

FUNCTIONAL BLOCK DIAGRAM

AD7276

EVAL-SDP-CB1Z

CONTROLLER

BOARD

5 V

BF527

DSP

SERIAL

INTERFACE

ON-BOARD

POWER SUPPLIES

VAMP-

ADG3308

LEVEL

SHIFTER

VIN

INPUT

JACK

VAMP+

GND

SCLK

VIN

AD780

Ref

VDD

GND

EVAL-AD7276SDZ

ADP7104

SDP 5V

ADP1613

+/-5V

ADP1720

3.3V

AM1185

POWER

SEQUENCER

OP AMP

SUPPLIES

ADA4000-1

VIN

VDD

7-9V

SDATA

GND

BIAS UP

CIRCUIT

VIN Unbiased

VIN

AD8022

BUFFER

48MHZ

SCLK

ADA4000-1

BUFFER

Figure 1 Functional Block Diagram

Evaluation Board User Guide UG-xxx-AD7276

Rev. PrA | Page 3 of 28

TABLE OF CONTENTS

E VA L-AD7276SDZ KIT Contents..............................................1

Additional Equipment Needed........................................................1

Evaluation Board Description .........................................................1

Functional Block Diagram ...............................................................2

Revision History ................................................................................3

E VA L-AD7276SDZ Quickstart Guide ...........................................4

Recommended Quick Start GUIDE...........................................4

Evaluation Board Hardware.............................................................5

AD7276 Device description.........................................................5

Hardware Link Options................................................................6

Power Supplies...............................................................................8

Serial Interface...............................................................................8

Stand-alone mode .........................................................................8

Analog Inputs ................................................................................8

Reference Options.........................................................................9

Sockets/Connectors ......................................................................9

E VA L-AD7276SDZ Basic Hardware Setup ..........................10

Evaluation Board SoftwarE............................................................11

Software Installation...................................................................11

Launching The Software ............................................................13

Software Operation.....................................................................13

Description of User Software panel..........................................14

WaveForm Capture .....................................................................16

AC Testing - Histogram .............................................................17

DC Testing - Histogram.............................................................17

AC Testing - FFT Capture..........................................................18

Summary Tab...............................................................................19

Save File ........................................................................................20

Load File.......................................................................................20

Evaluation Board Schematics and Artwork.................................21

REVISION HISTORY

07/12—Revision PrA

UG-xxx-AD7276

Evaluation Board User

Guide

Rev. PrA | Page 4 of 28

EVAL-AD7276SDZ QUICKSTART GUIDE

RECOMMENDED QUICK START GUIDE

To install the software do the following:

(1) Install the AD7276 Software from the enclosed CD.

Ensure the EVAL-SDP-CB1Z board is disconnected

from the USB port of the PC while installing the

software. The PC must be restarted after the

installation.

(2) Connect the EVAL-SDP-CB1Z board to the E VA L-

AD7276SDZ board as shown in

(3) Figure 2.

(4) Screwing the two boards together with the enclosed

nylon screw-nut set will ensure the boards connect

firmly together.

(5) Connect the 9V power supply adapter included in the

kit to connecter J702 on the EVAL-AD7276SDZ

board.

(6) Connect the EVAL-SDP-CB1Z board to the PC via the

USB cable. For Windows XP you may need to search

for the EVAL-SDP-CB1Z drivers. Choose to

automatically search for the drivers for the EVAL-

SDP-CB1Z board if prompted by the operating

system.

(7) Launch the E VA L -AD7276SDZ software from the

Analog Devices subfolder in the Programs menu.

Figure 2. Hardware Configuration – Setting up the EVAL-AD7276SDZ.

Evaluation Board User

Guide

UG-xxx-AD7276

Rev. PrA | Page 5 of 28

EVALUATION BOARD HARDWARE

AD7276 DEVICE DESCRIPTION

The AD7276/AD7277/AD7278 are 12-/10-/8-bit, high speed,

low power, successive approximation analog-to-digital

converters (ADCs), respectively. The parts operate from a single

2.35 V to 3.6 V power supply and feature throughput rates of up

to 3 MSPS. The parts contain a low noise, wide bandwidth

track-and-hold amplifier that can handle input frequencies in

excess of 55 MHz.

The conversion process and data acquisition are controlled

using CS and the serial clock, allowing the devices to interface

with microprocessors or DSPs. The input signal is sampled on

the falling edge of CS, and the conversion is also initiated at this

point. There are no pipeline delays associated with the part.

The AD7276/AD7277/AD7278 use advanced design techniques

to achieve very low power dissipation at high throughput rates.

The reference for the part is taken internally from VDD. This

allows the widest dynamic input range to the ADC; therefore,

the analog input range for the part is 0 to VDD. The conversion

rate is determined by the SCLK.

UG-xxx-AD7276

Evaluation Board User

Guide

Rev. PrA | Page 6 of 28

HARDWARE LINK OPTIONS

There are 12 link options, which must be set for the required operating setup before using the evaluation board. The functions of these

options are outlined in Table 1. Shows the position in which all the links are set when the evaluation board is packaged. Jumper and

solder link (LKx) options must be set correctly to select the appropriate operating setup before using the evaluation board. The default

link positions are shown in Table 2 and the functions of these options are outlined in Table 1

Table 1 Link Options

Link No. Function

LK1

-AMP: Amplifier negative voltage supply Selection

PositionA: Amplifier negative voltage supplied from on board supply

Position B: Amplifier negative voltage supplied from external source via J3 terminal 1.

LK2

+AMP: Amplifier Positive voltage Selection

Position A: Amplifier Positive voltage supplied from on board supply

Position B: Amplifier Positive voltage supplied from external source via J3 terminal 3.

LK3

Bias Up voltage select: Selects voltage level supplied to U4

Position A:Selected voltage level is VDD

Position B: Selected voltage level is 0V

LK4

VDD source select

Position A:VDD is sourced from U5

Position B: VDD is sourced externally via J4

LK5

U5 output voltage select:

PLACED: U5 output voltage is 3.0V

REMOVED: U5 output voltage is 2.5V

LK6

VIN Unbiased input impedance selection.

INSERTED: input impedance is 51Ω

LK7

CS signal

Position A: connected from EVAL-SDP-CB1Z

Position B: connected externally via J6

LK8

Biased signal Input

INSERTED: Biased up signal is available to the input buffer U7-A

LK9

SCLK signal

Position A: connected from EVAL-SDP-CB1Z

Position B: connected externally via J8

LK10

Buffer Input Source

PositionA: Input signal applied to Buffer U7-A

Position B: Input to Buffer U7-A set to 0V

LK11

VIN input impedance selection.

INSERTED: input impedance is 51Ω

LK12

SDATA signal

Position A: connected to EVAL-SDP-CB1Z

Position B: connected externally via J9

1 Both LK1 and LK2 should always be in matching positions.

Evaluation Board User

Guide

UG-xxx-AD7276

Rev. PrA | Page 7 of 28

Table 2 Link Options -Setup condition

Link No. Position Function

LK1 A Amplifier negative voltage supplied from on board supply

LK2 A Amplifier Positive voltage supplied from on board supply

LK3 A Selected voltage level is VDD to U4-A

LK4 A VDD sourced from U5

LK5

INSERTED

U5 output voltage is 3.0V

LK6 INSERTED VIN Unbiased input impedance is 51Ω

LK7 A Connected to EVAL-SDP-CB1Z

LK8 INSERTED Biased up signal is available to the input buffer U7-A

LK9 A Connected to EVAL-SDP-CB1Z

LK10 A Input signal applied to Buffer U7-A

LK11 INSERTED VIN Unbiased input impedance is 51Ω

LK12 A Connected to EVAL-SDP-CB1Z

UG-xxx-AD7276

Evaluation Board User

Guide

Rev. PrA | Page 8 of 28

POWER SUPPLIES

Care should be taken before applying power and signals to the

evaluation board to ensure that all link positions are as required

by the operating mode.

When using the E VA L-AD7276SDZ in conjunction with the

EVAL-SDP-CB1Z board, connect the AC transformer to

connector J1. VDD,+AMP and -AMP are generated on-board.

Alternatively a bench power supply may be connected to J2 to

supply 7V to 9V

Table 3. External Power Supply Requirements

POWER

SUPPLY

VOLTAGE

RANGE

PURPOSE

VIN1

7V to 9V Supplies all onboard power supplies

which generate all required voltages

to run the evaluation board

AMP+

J3-3

+5V Amplifier positive supply

AMP-

J3-1

-5V Amplifier negative supply

VDD

2.35V to

3.6V

VDD digital supply.

1. When this is supplied all other power supplies are available onboard.

If this supply is not used then all other supplies must be sourced from

an external source.

SERIAL INTERFACE

The AD7276 uses a high speed serial interface which allows

sampling rates up to 3MSPS. For details on the operation of the

serial bus, refer to the AD7276 datasheet.

The E VA L -AD7276SDZ communicates with the EVAL-SDP-

CB1Z board using level shifters. The EVAL-SDP-CB1Z

operates at a 3.3V logic level. This allows VDRIVE voltages to

exceed 3.3V to be used without damaging the SDP interface.

Details of the serial interface can be found in the AD7276

Datasheets.

STAND-ALONE MODE

The E VA L -AD7276SDZ may also be used without the EVAL-

SDP-CB1Z. In this case, connection to the digital interface in

made via the SMB footprints as follows:

Table 4. Standalone Jumper Settings

PIN SMB JUMPER SETTINGS

CS J6 Shorting link in position B

SCLK J8 Shorting link in position B

SDATA J9 Shorting link in position B

ANALOG INPUTS

Two options are available:

VIN (J7)

Use this input when a unipolar signal source is available. The

input is buffered by U7 and fed to the AD7276 via an R-C filter.

Table 5. Unipolar Input Jumper Settings

LINK JUMPER SETTINGS

LK8 Removed

All other link as Table 2 Link Options -Setup condition

VIN UNBIASED (J5)

Use this when the signal source is bipolar. The input is biased

up by U6 and buffered by U7 and fed to the AD7276 via an R-C

filter.

Table 6. Bipolar Input Jumper Settings

LINK JUMPER SETTINGS

LK11 Removed

All other link as Table 2 Link Options -Setup condition

Evaluation Board User

Guide

UG-xxx-AD7276

Rev. PrA | Page 9 of 28

REFERENCE OPTIONS

the reference source is an AD780: 2.5 V/3.0 V Ultrahigh

Precision Bandgap Voltage Reference. The reference is taken from

the VDD pin of the AD7276. An external VDD voltage may also

be applied to J4

SOCKETS/CONNECTORS

Table 7 Socket connector functions

Socket Function

J1 PWR 7- 9V DC transformer power connector.

J2 7-9V bench supply screw terminal connector.

VSS & VDD

Screw terminal connectors for external

amplifier power supplies.

J4 External power supply for VDD of the AD7276.

VIN UNBIASED

Analog input for use with bipolar signal

sources.

External connection to CS .

VIN UNBIASED

Analog input for use with unipolar signal

sources.

SCLK

External connection to SCLK.

SDATA

External connection to SDATA.

J10 EVAL-SDP-CB1Z Eval board controller socket

UG-xxx-AD7276

Evaluation Board User

Guide

Rev. PrA | Page 10 of 28

EVAL-AD7276SDZ BASIC HARDWARE SETUP

The AD7276 evaluation board connects to the (EVAL-SDP-

CB1Z) System Demonstration Board. The EVAL-SDP-CB1Z

Board is the controller board, which is the communication link

between the PC and the main evaluation board.

Figure 2 shows a photograph of the connections made between

the AD7276 daughter board and the EVAL-SDP-CB1Z board.

Before connecting power, connect the E VA L -AD7276SDZ

board to connector A or connector B on the EVAL-SDP-CB1Z

board. Nylon screws are included in the E VA L -AD7276SDZ

evaluation kit and can be used to ensure the EVA L -AD7276SDZ

board and the EVAL-SDP-CB1Z board are connected firmly

together.

Once the E VA L-AD7276SDZ board and the EVAL-SDP-CB1Z

board are connected securely, connect the power supplies on

the E VA L -AD7276SDZ board. The E VA L -AD7276SDZ requires

an external power supply which is included in the evaluation

board kit. Connect this power supply to the connector J1 on the

E VA L-AD7276SDZ board. Alternatively, a bench power supply

may be used to power the E VA L -AD7276SDZ via J2. Further

details on the required power supplies connections and options

are detailed in Table 7 Socket connector functions

Before connecting the EVAL-SDP-CB1Z board to your

PC, ensure that the AD7276 software has been installed

from the enclosed CD. The full software installation

procedure is detailed in the Software Installation section.

Finally connect the EVAL-SDP-CB1Z board to the PC via the

USB cable enclosed in the EVAL-SDPCB1Z kit. If using

Windows XP platform, you may need to search for the EVAL

SDP-CB1Z drivers.

Choose to automatically search for the drivers for the EVAL-

SDP-CB1Z board if prompted by the operating system.

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