EVAL-AD7747EBZ Analog Devices Inc, EVAL-AD7747EBZ Datasheet

24-Bit Capacitance-to-Digital Converter Eval. Board

EVAL-AD7747EBZ

Manufacturer Part Number
EVAL-AD7747EBZ
Description
24-Bit Capacitance-to-Digital Converter Eval. Board
Manufacturer
Analog Devices Inc
Datasheets

Specifications of EVAL-AD7747EBZ

Silicon Manufacturer
Analog Devices
Application Sub Type
Capacitance-to-Digital Converter
Kit Application Type
Data Converter
Silicon Core Number
AD7747
Sensor Type
Touch, Capacitive
Interface
I²C
Voltage - Supply
2.7 V ~ 5.25 V
Embedded
No
Utilized Ic / Part
AD7747
Kit Contents
Board
Rohs Compliant
Yes
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Sensitivity
-
Sensing Range
-
Lead Free Status / RoHS Status
Lead free / RoHS Compliant, Lead free / RoHS Compliant

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
EVAL-AD7747EBZ
Manufacturer:
Analog Devices Inc
Quantity:
135
FEATURES
Full-featured evaluation board for the AD7747
PC evaluation software for control and measurement of the
USB interface with cable
APPLICATIONS
AD7747 performance evaluation
Platform to integrate the AD7747 into system design
AD7747 PART DESCRIPTION
The AD7747 is a high-resolution Σ-Δ capacitance-to-digital
converter (CDC). The capacitance to be measured is connected
directly to the device inputs. The architecture features inherent
high resolution (24-bit no missing codes, 18-bit effective resolu-
tion at a 16.6 Hz data rate), high linearity (±0.01%), and high
accuracy (±4 fF factory calibrated). The AD7747 capacitance
input range is ±8 pF (changing), while it can accept up to 17 pF
absolute capacitance (not changing), which is compensated by
an on-chip digital-to-capacitance converter (CAPDAC).
The AD7747 is designed for single-ended or differential capaci-
tive sensors with one plate connected to ground. For floating
capacitive sensors, the
Rev. 0
Evaluation boards are only intended for device evaluation and not for production purposes.
Evaluation boards are supplied “as is” and without warranties of any kind, express, implied, or
statutory including, but not limited to, any implied warranty of merchantability or fitness for a
particular purpose. No license is granted by implication or otherwise under any patents or other
intellectual property by application or use of evaluation boards. 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 that may result
from its use. Analog Devices reserves the right to change devices or specifications at any time
without notice. Trademarks and registered trademarks are the property of their respective owners.
Evaluation boards are not authorized to be used in life support devices or systems.
AD7747
PC USER SOFTWARE
AD7745
or
AD7746
is recommended.
USB
FUNCTIONAL BLOCK DIAGRAM
OPTIONAL
EXT. AV
Evaluation Board for 24-Bit Capacitance-to-
Digital Converter with Temperature Sensor
DD
VOLT. REG.
ADP3303
Figure 1.
EEPROM
CYPRES
(USB ID)
EZ USB
5.0V
3.3V
EXT
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
The part has an on-chip temperature sensor with resolution of
0.1°C and accuracy of ±2°C. The on-chip voltage reference and
the on-chip clock generator eliminate the need for any external
components in most capacitive sensor applications. The part
has a standard voltage input that, together with the differential
reference input, allows easy interface to an external temperature
sensor, such as an RTD, thermistor, or diode.
The AD7747 has a 2-wire, I
The part operates from a single 3 V or 5 V power supply. It is
specified over the automotive temperature range of −40°C to
+125°C and is housed in a 16-lead TSSOP package.
More information on the AD7747 can be found in the
data sheet that is available from Analog Devices, Inc., and
should be consulted in conjunction with this document when
using the evaluation board.
EVALUATION BOARD DESCRIPTION
The evaluation board interfaces to the USB port of a PC. Evalu-
ation software is available with the evaluation board, which
allows the user to easily communicate with the AD7747.
Note that the AD7747 evaluation board software must be installed
before connecting the AD7747 evaluation board to the PC.
SDA
SCL
RDY
I
2
C
AC-SHLD GND
AV
AD7747
DD
©2008 Analog Devices, Inc. All rights reserved.
CIN1 (+) CIN1 (–)
2
C®-compatible serial interface.
EVAL-AD7747
V
V
IN
REF
www.analog.com
AD7747

Related parts for EVAL-AD7747EBZ

EVAL-AD7747EBZ Summary of contents

Page 1

... Rev. 0 Evaluation boards are only intended for device evaluation and not for production purposes. Evaluation boards are supplied “as is” and without warranties of any kind, express, implied, or statutory including, but not limited to, any implied warranty of merchantability or fitness for a particular purpose. No license is granted by implication or otherwise under any patents or other intellectual property by application or use of evaluation boards ...

Page 2

... Power Supplies .............................................................................. Interface Configuration Options ......................................... 3 Connectors .................................................................................... 4 REVISION HISTORY 12/08—Revision 0: Initial Version   Evaluation Board Interfacing .......................................................5   Configuring the AD7747 Evaluation Board ..............................5   Evaluation Board Software ...............................................................6   Performing a Noise Analysis ........................................................8   Saving User Configurations .........................................................8   Evaluation Board Schematic ............................................................9   Evaluation Board Layout ............................................................... 10   ...

Page 3

... C signals, SDA and SCL, on LK2. Default Links in the SDA and SCL positions of LK2 connect the USB 2 microcontroller as the I C bus master to the on-board AD7747, as shown in Figure 2. This allows easy use of the evaluation board with the PC software. AD7747 EVALUATION BOARD U3 SDA MICRO- μ C ...

Page 4

... There are four SMB connectors relevant to the operation of the AD7747 on this evaluation board. The functions of these connectors are outlined in Table 1 There are also headers marked LK1 to LK3 that allow flexibility in the use of the evaluation board, as described in Table 2. Table 2. Evaluation Board Link Settings Link Default ...

Page 5

... PC. After the AD7747 evaluation board software has been installed, connect the board to the PC via J1 on the AD7747 evaluation board and the USB port on the PC using the supplied USB connector cable. The green colored POWER LED should light up on the evaluation board ...

Page 6

... EVAL-AD7747 EVALUATION BOARD SOFTWARE Use the following steps to run the AD7747 evaluation board software: 1. Select Start Menu > Program Files > Analog Devices\ AD7747 Evaluation Software\AD7747. The application displays the Real Time tab by default (see Figure 6 get started, click the Quick Setup button. ...

Page 7

... Click OK to return to the Real Time tab. Figure 7. Setup Tab 6. Without any capacitance connected to the AD7747 evaluation board, click START. The samples gathered are displayed graphically in real time. The samples are also displayed in hexadecimal and capacitance formats. The capacitance should read approx- imately 0 pF (with no capacitance connected) ...

Page 8

... EVAL-AD7747 PERFORMING A NOISE ANALYSIS 1. With the quick setup for capacitive Channel 1 still in place, select the Analysis tab to display analysis options (shown in Figure 8). 2. Enter the required number of samples and click the START button. Once the samples are gathered, you can display them as a waveform histogram ...

Page 9

... EVALUATION BOARD SCHEMATIC Figure 9. Evaluation Board Schematic Rev Page EVAL-AD7747 07725-007 ...

Page 10

... EVAL-AD7747 EVALUATION BOARD LAYOUT Figure 10. Component ID Figure 11. Top Layer Figure 12. Bottom Layer Rev Page ...

Page 11

... ORDERING INFORMATION ORDERING GUIDE Model Description 1 EVAL-AD7747EBZ Evaluation Board RoHS Compliant Part. ESD CAUTION Rev Page EVAL-AD7747 ...

Page 12

... EVAL-AD7747 NOTES ©2008 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. EB07725-0-12/08(0) Rev Page ...

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