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AD7714.rar （6个子文件）

ASM Code for Interfacing AD7714 to AT89C2051.txt 7KB

7714-5EB

7714-5EB.pdf 159KB

ad7714sw.pdf 230KB

ad7714.zip 494KB

ad7714-3.pdf 158KB

C Code for Interfacing AD7705 to 68HC11.txt 3KB

One Technology Way, P.O. Box 9106, Norwood. MA 02062-9106, U.S.A.

Tel: 617/329-4700 Fax: 617/326-8703

Evaluation Board for

Signal Conditioning ADC

EVAL-AD7714-5EB

FEATURES

Operates from a Single +5V Supply

On-Board Reference and Digital Buffers

Various Linking Options

Direct Hook-Up to Printer Port of PC

PC Software for Control and Data Analysis

OPERATING THE AD7714-5 EVALUATION BOARD

Power Supplies

The evaluation board has four power supply input pins: AV

AGND, DV

and DGND. The AD7714-5 is specified with an

of +5V. Therefore, the AV

voltage supplied to the

board must be +5V. This AV

voltage is also used to power the

AD780 reference. The AD7714-5 can be operated from a +5V

or +3V DV

voltage. When using the 9-way D-type connector

to interface to the evaluation board it is possible to apply a

voltage of either +3V or +5V to the DV

input terminal

on the board. However, when using the 36-way Centronics

connector to interface to the board, the voltage applied to the

input terminal must be +5V. This is because the

Centronics connector is intended for connection to the printer

port of a PC with signals driven from +5V supplies. To run the

board from a single +5V supply, simply connect the AV

and

inputs together.

Both AGND and DGND inputs are provided on the board.

AGND connects to the AD7714-5 AGND pin and also con-

nects to the GND pin of the AD780. DGND connects to the

DGND pin of the AD7714 and to the GND of the digital chips

on the board. The AGND and DGND planes are connected at

the AD7714. Therefore, it is recommended not to connect

AGND and DGND elsewhere in the system to avoid ground

loop problems. When using a single supply for both AV

and

, only one ground connection should be made to the

board. This connection should be made to the board's AGND

input terminal.

Both supplies are decoupled to their respective ground plane

with 10µF tantalum and 0.1µF ceramic disc capacitors.

AD7714

ADC

9-WAY D-TYPE CONNECTOR

36-WAY

CENTRONICS

CONNECTOR

AD780

REFERENCE

AIN1

AIN2

AGND

DGND

AIN3

AIN4

AIN5

AIN6

REF IN

BUFFERS

MCLK IN

INTRODUCTION

This Application Note describes the evaluation board for the

AD7714-5, 24-Bit signal conditioning ADC. The AD7714 is a

complete analog front end for low-frequency applications

providing either three fully-differential or five pseudo-

differential input channels. The device accepts low-level signals

directly from a transducer and outputs a serial digital word. It

employs a sigma delta technique to realize up to 24 bits of no

missing codes performance. Full data on the AD7714-5 is

available in the AD7714 data sheet available from Analog

Devices and should be consulted in conjunction with this

Application Note when using the Evaluation Board.

Included on the evaluation board, along with the AD7714-5, are

an AD780, a +2.5 V ultra high precision bandgap reference, a

2.4576MHz crystal and digital buffers to buffer signals to and

from the edge connectors.

Interfacing to this board is provided either through a 36-Way

Centronics Connector or through a 9-way D-type connector.

External sockets are provided for the analog inputs, an external

reference input option and an external master clock option.

FUNCTIONAL BLOCK DIAGRAM

REV. A

Information furnished by Analog Devices is believed to be accurate and

reliable. However, no responsibility is assumed by Analog Devices for its

use, nor for any infringements of patents or other rights of third parties

which may result from its use. No license is granted by implication or

otherwise under any patent or patent rights of Analog Devices.

EVAL-AD7714-5EB

REV. A

–2–

Link Options

There are a number of link options on the evaluation board which should be set for the required operating setup before using the

board. The functions of these link options are described in detail below.

Link No. Function

LK1 This option selects the master clock option for the AD7714. The master clock source comes from the on-board

crystal or from an external clock source via SKT6. This is a double link and both links must be moved together for

correct operation.

With both links in position A, the external clock option is selected and an externally applied clock to SKT 6 is routed

the MCLK IN pin of the AD7714.

With both links in position B, the on-board crystal is selected and provides the master clock for the AD7714.

LK2 This link option is used to determine whether the AD7714 is in its normal operating mode or its

STANDBY (power

down) mode.

With this link in position A, the

STANDBY input is connected to a logic high thus configuring the part for normal

operation.

With this link in position B, the

STANDBY pin is connected to a logic low and the AD7714 is placed in its power

down mode where its power dissipation is typically 100µW.

LK3 This link option is used to control the buffer option input on the AD7714 (i.e. determine the voltage on the AD7714

BUFFER pin).

With this link in position A, a logic high is connected to this input. This connects the on-chip buffer in series with the

analog input which allows the inputs to handle higher source impedance.

With this link in position B, a logic low is connected to the buffer option select input. With this input low, the on-chip

buffer on the analog input is shorted out.

LK4 This link controls the polarity of the serial clock.

With this link in position A, the POL pin is connected to a logic high. With this input high, the first transition of the

serial clock in a data transfer operation is from a high to a low.

With this link in position B, the POL input is connected to a logic low and the first transition of the serial clock in a

data transfer operation is from a low to a high.

LK5 This link option is used to select the reference source for the AD7714's REF IN(-) input.

With this link in position A, the REF IN(-) pin of the AD7714 is connected directly to AGND.

With this link in position B, the REF IN(-) pin of the AD7714 is connected to SKT10. An external voltage connected

to SKT10 can now be used for REF IN(-).

LK6 This link option is used to select the reference source for the AD7714's REF IN(+) input.

With this link in position A, the REF IN (+) pin of the AD7714 is connected directly to the output of the on-board

reference, the AD780.

With this link in position B, the REF IN(+) pin of the AD7714 is connected to SKT9. An external voltage connected

to SKT 9 can now be used for REF IN(+).

LK7 This link option is set depending on the type of reference being used on the evaluation board. Although the board is

equipped with an AD780, a REF-192 +2.5V reference can replace it in the same socket. When a REF-192 reference

is used on the board, the link should be in position A. In position A, the REF-192's shutdown pin is connected to the

STANDBY pin of the AD7714 and is controlled by LK2.

When the AD780 reference is used, the link should be in position B as the AD780 does not have a shutdown pin.

LK8-LK13 These links are in series with the AIN 1 through AIN 6 analog inputs respectively.

With these links in place, the analog input on the relevant SKT input is connected directly to the respective AIN

input on the part. For example, with LK8 in place, the analog signal applied to SKT7 is connected directly to AIN6

of the AD7714.

These links may be removed so that the input signals at the AIN SKTs can be connected to the component grid for

signal conditioning before being applied to the analog inputs of the AD7714.

EVAL-AD7714-5EB

REV. A

–3–

Setup Conditions

Table I shows the position in which all the links are set when the

evaluation board is sent out.

Table I. Initial Link Positions

Link No. Position Function.

LK1 B Both links in position B to select the

on-board crystal oscillator as the master

clock for the board.

LK2 A Connects

STANDBY high and thus

configures the part for normal

operation.

LK3 B The on-chip buffer on the AD7714 is

shorted out.

LK4 A Connects POL pin high such that the

first transition of the serial clock in a

data transfer is from a high to a low.

LK5 A REF IN(-) connected directly to

AGND.

LK6 A REF IN(+) connected to the output of

the on-board AD780 reference.

LK7 B Selects AD780 as the voltage reference.

LK8-LK13 IN Connects analog inputs from the input

sockets directly to the respective analog

input pins of the AD7714.

EVALUATION BOARD INTERFACING

Interfacing to the evaluation board is either via a 36-way

Centronics connector,SKT11, or a 9-way D-Type connector,

SKT1. The pinout for the SKT1 connector is given in Figure 1

and its corresponding pin designations are given in Table II.

The pinout for this SKT11 connector is shown in Figure 2 and

its pin designations are given in Table III. The evaluation board

should be powered up before a cable is connected to either of

the connectors.

SKT11 is used to connect the evaluation board to the printer

port (parallel port) of a PC. Connection between the two is

direct via a standard parallel printer port cable. SKT1 is used to

connect the evaluation board to any other system.

Figure 2. SKT1 Pin Configuration

2431

678 9

Table II. SKT1 Pin Designations

1 SCLK Serial Clock. The signal on this pin is buffered

before being applied to the SCLK pin of the

AD7714.

DRDY Logic Output. This is a buffered version of the

signal on the AD7714's

DRDY pin.

CS Chip Select. The signal on this pin is buffered

before being applied to the

CS pin of the

AD7714.

RESET Reset Input. The signal on this pin is buffered

before being applied to the

RESET pin of the

AD7714.

5 DIN Serial Data Input. Data applied to this pin is

buffered before being applied to the AD7714's

DIN pin.

6 DGND Ground reference point for digital circuitry.

Connects to the DGND plane on the evaluation

board.

7 DOUT Serial Data Output. This is a buffered version of

the signal on the AD7714's DOUT pin.

8DV

Digital Supply Voltage. If no DV

voltage is

applied to the board's DV

input terminal,

then the voltage applied to this pin of the con-

nector will supply the DV

for the evaluation

board.

SYNC Logic Input. The signal on this pin is buffered

before being applied to the

SYNC pin of the

AD7714.

NOTE

An explanation of the AD7714 functions mentioned here is given in Table III as

part of the SKT11 pin designations description.

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yuning4188

2022-11-04

超赞的资源，感谢资源主分享，大家一起进步！
名字长一点会不会显得我更有身份

2023-09-14

资源不错，很实用，内容全面，介绍详细，很好用，谢谢分享。

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