EVAL-AD7783EBZ Analog Devices Inc, EVAL-AD7783EBZ Datasheet

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EVAL-AD7783EBZ

Manufacturer Part Number
EVAL-AD7783EBZ
Description
EVALUATION BOARD
Manufacturer
Analog Devices Inc
Datasheets

Specifications of EVAL-AD7783EBZ

Number Of Adc's
1
Number Of Bits
24
Sampling Rate (per Second)
32k
Data Interface
SPI™, QSPI™, MICROWIRE™, and DSP
Inputs Per Adc
1 Differential
Input Range
±2.56 V
Voltage Supply Source
Single Supply
Operating Temperature
-40°C ~ 85°C
Utilized Ic / Part
AD7783
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
FEATURES
INTRODUCTION
This Technical Note describes the evaluation board
for the AD7783, Low Voltage, Low Power, 24-Bit,
Sigma Delta ADC. The AD7783 is a complete analog
front end for low frequency measurement applications.
The part does not require software control as all
programmable functions are hardware controlled. The
device can accept low level input signals directly from
a transducer and produce a serial digital output. It
employs a sigma-delta conversion technique to realize
up to 24 bits of no missing codes performance. The
input signal is applied to a proprietary programmable
gain front end based around an analog modulator. The
modulator output is processed by an on-chip digital
filter. The analog input channel can accept analog
input signals of +160 mV or +2.56 V. Full data on the
AD7783 is available in the AD7783 datasheet avail-
able from Analog Devices and should be consulted in
conjunction with this Technical Note when using the
evaluation board.
The evaluation board interfaces to the parallel port of
an IBM compatible PC. Software is available with the
REV.
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.
Full-Featured Evaluation Board for the
A D 7 7 8 3
On-Board Reference and Digital Buffers
Various Linking Options
PC Software for Control of AD7783
O
evaluation board which allows the user to easily
communicate with the AD7783.
Other components on the AD7783 Evaluation Board
include an AD780 (precision 2.5V reference), a
32.7680 kHz crystal and digital buffers to buffer
signals to and from the PC.
OPERATING THE AD7783 EVAL BOARD
Power Supplies
This evaluation board has four power supply inputs:
V
be applied between V
provide the V
some digital buffers. Digital Power connections can
be obtained via the edge connector or they can be
derived from V
DV
connected together at the AD7783 GND pin. There-
fore, it is recommended not to connect GND and
DGND elsewhere in the system.
All power supplies are decoupled to their respective
grounds.
capacitor and 0.1µF ceramic capacitor at the input to the
evaluation board. It is again decoupled using 0.1µF ca-
pacitors as close as possible to each device.
One Technology Way, P.O. Box 9106, Norwood. MA 02062-9106,
U.S.A.
Tel: 617/329-4700
Evaluation Board for the AD7783,
DD
DD
, GND, DV
for the AND gates.
V
DD
DD
24-Bit, Sigma Delta ADC
DD
DD
is decoupled using a 10µF tantalum
. The DV
for the AD7783, the reference and
and DGND. An external +5V must
DD
Fig. 1. Evaluation Board Set-up
and GND which is used to
EVAL-AD7783-EB
DD
DGND and GND are
is used to provide the
Fax: 617/326-8703

Related parts for EVAL-AD7783EBZ

EVAL-AD7783EBZ Summary of contents

Page 1

... V is decoupled using a 10µF tantalum DD capacitor and 0.1µF ceramic capacitor at the input to the evaluation board again decoupled using 0.1µF ca- pacitors as close as possible to each device. Fig. 1. Evaluation Board Set-up One Technology Way, P.O. Box 9106, Norwood. MA 02062-9106, U.S.A. Tel: 617/329-4700 ...

Page 2

... EVAL-AD7783-EB LINK AND SWITCH OPTIONS There are twelve link options which must be set for the required operating setup before using the evaluation board. The functions of these link options are outlined below. Link No. Function LK1-LK2 These links are in series with the AIN analog inputs. ...

Page 3

... P2. The pin-out for the P3 connector is shown in Fig. 2 and its pin designations are given in Table 2. out for the P2 connector is shown in Fig. 3 and its pin designations are given in Table used to connect the evaluation board to the parallel (printer) port of a PC. Connection is via a standard printer cable used to connect the evaluation board to any other system. The evaluation board should be powered up before a cable is connected to either of these connectors ...

Page 4

... Connect. These pins are not connected on the evaluation board. SOCKETS There are nine sockets relevant to the operation of the AD7783 on this evaluation board. The functions of these sockets are outlined in Table 4. Fig. 3: 36-way Centronics (P2) Pin Configuration is an active low Logic Input used to select the AD7783. When signals between the AD7783 and P2 when link LK12 is open ...

Page 5

... PC to control the AD7783. The software uses the printer port of the PC to communicate with the AD7783 Centronics printer cable is used to connect the PC to the evaluation board. Software Requirements and Installation The software runs under Windows ME 2000 NT™ and typically requires 8Mb of RAM. ...

Page 6

... EVAL-AD7783-EB What follows is a description of the various windows that appear while the software is being used. Fig. 4. shows the main screen that appears once the program has started. The printer port that will be used by the software is determined automatically. There are three possible printer ports that can be handled by the software, LPT1 (standard), LPT2 and PRN ...

Page 7

... ADC (in decimal and hexadecimal), as well as the average code, the average value and the RMS and Peak-Peak noise values. From this screen it is possible to display the data on a graph histogram of codes. Figures 7 & 8 show the Graph and Histogram screens. Fig. 6. The ADC Noise Analysis Screen - 7 - EVAL-AD7783-EB Rev. O ...

Page 8

... EVAL-AD7783-EB The Graph Screen Fig. 7 shows the Graph Screen. This screen displays the data in a graph format. Fig. 7. The Graph Screen Fig. 8. The Histogram Screen - 8 - Rev. O ...

Page 9

... Fig. 21. The Evaluation Board Schematic - 9 - EVAL-AD7783-EB Rev. O ...

Page 10

... EVAL-AD7783-EB Table 6. Component Listing and Manufacturers INTEGRATED CIRCUITS Component AD7783 AD780AR MM74HC4050M MM74C08M CD74ACT244M SD103C CAPACITORS Component 10µF ± 20% Tantalum (16 V) 0.1µF Ceramic (0805 SMD) RESISTORS Component Short Circuits 6kW SMD Resistor 10kW SMD Resistor LINK OPTIONS Component Pin Headers ...

Page 11

... Fig. 22. The Evaluation EVAL-AD7783-EB Board Component Layout - 11 - Diagram Rev. O ...

Page 12

... EVAL-AD7783-EB Fig. 23. The Fig. 23. Evaluation Board Component The Evaluation Board - 12 - Side Artwork SolderSide Artwork Rev. O ...

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