EVAL-AD7714-3EBZ Analog Devices Inc, EVAL-AD7714-3EBZ Datasheet

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EVAL-AD7714-3EBZ

Manufacturer Part Number
EVAL-AD7714-3EBZ
Description
BOARD EVALUATION FOR AD7714
Manufacturer
Analog Devices Inc
Datasheets

Specifications of EVAL-AD7714-3EBZ

Number Of Adc's
1
Number Of Bits
24
Sampling Rate (per Second)
1k
Data Interface
Serial
Inputs Per Adc
3 Differential
Input Range
0 ~ 3.3 V
Power (typ) @ Conditions
3.65mW @ 3.3 V
Voltage Supply Source
Analog and Digital
Operating Temperature
-40°C ~ 85°C
Utilized Ic / Part
AD7714-3
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
a
INTRODUCTION
This Application Note describes the evaluation board for the
AD7714-3, 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 AD7714-3 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 AD7714-3, are
an AD589, a +1.23 V 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.
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.
FEATURES
Operates from a Single +3V 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
AV DD
AIN1
AIN2
AIN3
AIN4
AIN5
AIN6
AGND
DV DD
FUNCTIONAL BLOCK DIAGRAM
REFERENCE
AD589
DGND
REF IN
AD7714
ADC
OPERATING THE AD7714-3 EVALUATION BOARD
Power Supplies
The evaluation board has four power supply input pins: AV
AGND, DV
board must be +3V. This AV
AD589 reference. To correctly handle the interface signals the
board must be operated from a +3V DV
using the 36-way Centronics connector to interface the printer
port of a PC to the board, the signals at this edge connector are
5V signals. The 74FCT3244T translates these signals to 3V
signals for the rest of the logic on the evaluation board. To run
the board from a single +3V supply, simply connect the AV
and DV
Both AGND and DGND inputs are provided on the board.
AGND connects to the AD7714-3 AGND pin and also con-
nects to the GND pin of the AD589. 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
DV
board. This connection should be made to the board's AGND
input terminal.
Both supplies are decoupled to their respective ground plane
with 10 F tantalum and 0.1 F ceramic disc capacitors.
AV
One Technology Way, P.O. Box 9106, Norwood. MA 02062-9106, U.S.A.
Tel: 617/329-4700
MCLK IN
DD
DD
, only one ground connection should be made to the
of +3V. Therefore, the AV
9-WAY D-TYPE CONNECTOR
DD
BUFFERS
inputs together.
DD
and DGND. The AD7714-3 is specified with an
Signal Conditioning ADC
Evaluation Board for
EVAL-AD7714-3EB
CENTRONICS
CONNECTOR
36-WAY
DD
voltage is also used to power the
DD
voltage supplied to the
DD
voltage also. When
Fax: 617/326-8703
DD
and
DD
DD
,

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EVAL-AD7714-3EBZ Summary of contents

Page 1

... Centronics connector to interface the printer port the board, the signals at this edge connector are 5V signals. The 74FCT3244T translates these signals to 3V signals for the rest of the logic on the evaluation board. To run the board from a single +3V supply, simply connect the AV and DV Both AGND and DGND inputs are provided on the board ...

Page 2

... EVAL-AD7714-3EB 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 ...

Page 3

... 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. ...

Page 4

... NC No Connect. These pins are not connected on the evaluation board. 19-30 DGND Ground reference point for digital circuitry. Connects to the DGND plane on the evaluation board. 31- Connect. These pins are not connected on the evaluation board. Figure 3. SKT11 Pin Configuration Table III. SKT11 Pin Designations cycles prior to the next output update ...

Page 5

... REV. A EVAL-AD7714-3EB To run the evaluation software simply run the executable file. The program provides a number of different menu-type screens, each screen containing several function options. On each of these menu-screens the user can choose the function by pressing the associated number key or click on the required option using the mouse ...

Page 6

... MCLK OUT AIN 3 BUFFER 13 LK3 DV DD AIN 4 AIN LK5 AIN REF IN(-) REF IN(+) STANDBY 0.1µ LK2 B IC2 B AD589 LK7 A Figure 3. AD7714-3 Evaluation Board Circuit Diagram –6– SKT 11 D4 ACK D2 D3 SLCT GND SCLK SYNC DRDY DOUT DGND RESET C19 13 12 ...

Page 7

... Lk1 (4x2 way) Lk2, Lk3, Lk4, Lk5, Lk6 ( 2x2 way) Lk8, Lk9, Lk10, Lk11, Lk12, Lk13 (1x2 way) Shorting Plugs Pin Headers (14 required) REV. A EVAL-AD7714-3EB Vendor Analog Devices Analog Devices Motorola Motorola Integrated Device Technology Hewlett Packard Vendor AVX- Kyocera Mftrs No TAG106MO16 Philips Mftrs No ...

Page 8

... EVAL-AD7714-3EB Switch Component Location Push Button Switch SW1 Sockets Component Location Miniature BNC Connectors SKT2 - SKT 10 9-Way D-Type Connector SKT1 36 Way Centronics Connector SKT 11 24-Pin IC Socket IC1 16-Pin IC Socket IC3 14- Pin IC Socket IC4 20-Pin IC Socket IC5 Wire Wrap Pins DGND, AGND, AVDD, ...

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