EVAL-AD7470_15 [ADI]
Evaluation Board for 10-/12-Bit High Speed, Low Power ADCs;
| 型号： | EVAL-AD7470_15 |
| 厂家： | 
ADI |
| 描述： | Evaluation Board for 10-/12-Bit High Speed, Low Power ADCs |
| 文件： | 总20页 (文件大小：712K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Evaluation Board for 10-/12-Bit
High Speed, Low Power ADCs
EVAL-AD7470/AD7472
operate from a single 2.7 V to 5.25 V supply. Full data on the
AD7470/AD7472 is available in the AD7470/AD7472 data sheet
available from Analog Devices, Inc. and should be consulted in
conjunction with this data sheet when using the evaluation board.
FEATURES
Full-featured evaluation board for the AD7470/AD7472
Compatible with the EVAL-CONTROL BRD2
Standalone capability
On-board components include an AD780 (a pin programmable
+2.5 V or +3 V ultra high precision band gap reference), an
AD797 and an AD711 (op amps used to buffer the bipolar and
unipolar analog input respectively), and an OP07 (op amp used
to buffer the DC bias voltage applied to the optional analog
input bias-up circuit). There are various link options, which are
explained in detail in the Link and Switch Options section.
On-board analog buffering and reference
Optional on-board analog bias-up circuit
Optional on-board burst clock generator circuit
Various linking options
PC software for control and data analysis when used with the
EVAL-CONTROL BRD2
GENERAL DESCRIPTION
Interface to this board is via a 96-way connector. This 96-way
connector is compatible with the EVAL-CONTROL BRD2 (also
available from Analog Devices). External sockets are provided
This data sheet describes the evaluation board for the AD7470/
AD7472. The AD7470/AD7472 are, respectively, 10-/12-bit,
high speed, low power, successive approximation ADCs that
CNVST
for the
input, CLKIN input, and the VIN inputs.
FUNCTIONAL BLOCK DIAGRAM
UNIPOLAR
AIN
BUFFER
DATA BUS
V
IN
BIPOLAR
AIN
AD7470/
AD7472
ADC
CONTROL LINES
BIAS-UP
BUFFER
CLOCK
GENERATOR
CIRCUITS
REFERENCE
REF
IN
POWER SUPPLY CIRCUIT
Figure 1.
Rev. C
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.
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
©2007 Analog Devices, Inc. All rights reserved.
EVAL-AD7470/AD7472
TABLE OF CONTENTS
Features .............................................................................................. 1
General Description......................................................................... 1
Functional Block Diagram .............................................................. 1
Revision History ............................................................................... 2
Evaluation Board Hardware............................................................ 3
Power Supplies .............................................................................. 3
Analog Input ................................................................................. 3
R8 Potentiometer (50 kΩ)........................................................... 3
Link and Switch Options............................................................. 3
Set-up Conditions ........................................................................ 4
EVAL-CONTROL BRD2 Interfacing ........................................ 5
Sockets ........................................................................................... 6
Connectors .................................................................................... 6
Operating with the EVAL-CONTROL BRD2...........................6
Evaluation Board Software...............................................................7
Setup Screen...................................................................................7
Setting Up the EVAL-CONTROL BRD2 ...................................7
Running the Software ...................................................................7
Software Configuration Files.......................................................8
Software Description ....................................................................8
Menu Bar........................................................................................9
Evaluation Board Schematics and Artwork................................ 11
Ordering Information.................................................................... 16
Bill of Materials........................................................................... 16
Ordering Guide .......................................................................... 17
ESD Caution................................................................................ 17
REVISION HISTORY
10/07—Rev. B to Rev. C
Updated Format..................................................................Universal
Changes to Analog Input Section................................................... 3
Changes to Table 1............................................................................ 3
Changes to Figure 6........................................................................ 11
Changes to Figure 7........................................................................ 12
Changes to Table 8.......................................................................... 16
Changes to Ordering Guide .......................................................... 17
Rev. C | Page 2 of 20
EVAL-AD7470/AD7472
EVALUATION BOARD HARDWARE
POWER SUPPLIES
ANALOG INPUT
When using this evaluation board with the EVAL-CONTROL
BRD2 all supplies are provided from the EVAL-CONTROL
BRD2 through the 96-way connector.
The analog input portion of this evaluation board accommo-
dates unipolar and bipolar signals. Unipolar signals within the
AD7470/AD7472 analog input signal range from 0 V to 2.5 V
and are connected via SK5. They are then buffered by the
on-board buffer before being applied to the VIN pin of the
AD7470/AD7472. Bipolar signals are connected via SK3 and
are biased up by the on-board bias-up buffer circuit before
being applied to the VIN pin of the AD7470/AD7472. The input
impedance of the bias-up circuit is 50 Ω, which is determined
by the value of R7. The input impedance may be modified by
removing/changing the value of R7. To obtain optimum perfor-
mance from this evaluation board, the use of an impedance
matched, passive filter is recommended before the analog signal
is applied to the evaluation board. For example, when using a
100 kHz input tone, a 100 kHz 50 Ω filter from TTE (part
number KC5-100K-15K-50-720B) is suitable.
When using the board as a standalone unit, external supplies
must be provided. This evaluation board has five power supply
inputs: VDD, AGND, VSS, VDRIVE, and DGND. Connect
+5 V to the VDD input to supply the AVDD and DVDD pins on
the AD7470/AD7472, the AD780 voltage reference, the positive
supply pin of all three op amps, and the digital control logic.
Connect 0 V to the AGND input. Connect −5 V to the VSS
input to supply the negative supply pins on all three op amps.
The VDRIVE input can be used to provide an external voltage
for the output drivers on the AD7470/AD7472. If an external
VDRIVE is supplied, it is referenced to the DGND input, which
should be tied to 0 V. The supplies are decoupled to the relevant
ground plane with 47 μF tantalum and 0.1 μF multilayer
ceramic capacitors at the point where they enter the board. The
supply pins of the op amps and reference are also decoupled to
AGND with a 10 μF tantalum and a 0.1 μF ceramic capacitor.
The AVDD supply pin is decoupled to AGND with 10 μF tanta-
lum and 0.1 μF multilayer ceramic capacitors. The AD7470/
AD7472 DVDD and VDRIVE pins are decoupled to AGND with
10 ꢀF tantalum capacitors and to DGND with 0.1 μF multilayer
ceramic capacitors.
R8 POTENTIOMETER (50 kΩ)
This variable resistor is used to trim the dc bias voltage applied
to the optional analog input bias-up circuit. This bias voltage is
factory preset to 1.25 V, which biases a bipolar signal to swing
around the midpoint of the analog input range (0 V to 2.5 V).
If any adjustment is required, the user can use the histogram
window in the evaluation board software to analyze the dc vol-
tage variation while adjusting the trimmer potentiometer. To
view this properly, an analog input signal should not be applied
to the board. Under normal operation, this potentiometer should
not be adjusted as it is preset for optimum performance.
Extensive ground planes are used on this board to minimize
the effect of high frequency noise interference. There are two
ground planes, AGND and DGND, that are connected at one
location close to the AD7470/AD7472.
LINK AND SWITCH OPTIONS
There are 11 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.
Table 1.
Link No. Function
LK1
This link is used to select the dc bias voltage to be applied to the optional VIN bias-up circuit.
If the user is using the bias-up circuit, this link must be inserted which applies the 2.5 V reference voltage to the bias-up circuit.
This causes a bipolar signal (applied to the bipolar VIN input socket) to be biased up around +1.25 V before it is applied to the
AD7470/AD7472 VIN pin (see also LK10).
If the bias up circuit is not being used, this link should be removed.
LK2
LK3
This link must be in Position A if external power supplies are being used. In this position, the control logic is being powered by
the voltage applied to the VDD input.
When power is being supplied from the EVAL-CONTROL BRD2, this link can be moved to Position B if the user wants to drive the
control logic from a separate +5 V, which is generated, on the EVAL-CONTROL BRD2.
This link option selects the source of the CLKIN input.
In Position A, the CLKIN input is provided by the EVAL-CONTROL BRD2.
In Position B, the CLKIN input is provided via the on-board 25 MHz oscillator.
In Position C, an external CLKIN signal must be provided via the external socket, SK1.
When using the on-board generated burst clock, this link must be in Position D.
Rev. C | Page 3 of 20
EVAL-AD7470/AD7472
Link No. Function
LK4
This link option selects the source of the CONVST input.
In Position A, the CONVST input is provided by the EVAL-CONTROL BOARD2.
In Position B, the CONVST input is provided via the external socket, SK2.
This link option selects the source of the RD input.
LK5
In Position A, the RD input is provided by the EVAL-CONTROL BRD2.
In Position B, the RD input is tied to GND.
LK6
This link option selects the source of the CS input.
In Position A, the CS input is provided by the EVAL-CONTROL BRD2.
In Position B, the CS input is tied to GND.
LK7
LK8
LK9
This link option sets the voltage applied to the VDRIVE pin on the AD7470/AD7472.
In Position A, VDRIVE is connected directly to the DVDD pin.
In Position B, an external voltage must be applied to the VDRIVE pin via J3.
This link selects the source of the VDD supply.
In Position A, VDD must be supplied from an external source via J2.
In Position B, VDD is supplied from the EVAL-CONTROL BRD2.
This link selects the source of the VSS supply.
In Position A, VSS must be supplied from an external source via J2.
In Position B, VSS is supplied from the EVAL-CONTROL BRD2.
LK10
LK11
This link must be in Position A, if a bipolar AIN signal is being applied to the bipolar VIN socket, SK3.
This link must be in Position B, if a unipolar AIN signal is being applied to the unipolar VIN socket, SK5.
This link is used to provide a clock signal path to the burst mode circuit generator either from the on-board clock oscillator or
from an external clock source via SK1.
In Position A, the master clock signal is provided from the on-board crystal oscillator.
In Position B, the master clock signal must be provided from an external source via SK1.
SET-UP CONDITIONS
Before applying power and signals to the evaluation board, take care to ensure that all link positions are as per the required operating
mode. Table 2 shows the default positions of the links. All links are set for use with the EVAL-CONTROL BRD2.
Table 2. Initial Link and Switch Positions
Link No.
Position
Function
LK1
Inserted
Provides dc bias voltage to the analog bias-up circuit.
LK2
LK3
LK4
LK5
A
A
A
A
A
A
B
The digital logic circuitry is powered from the same voltage as the AD7470/AD7472.
The CLKIN signal is provided by the EVAL-CONTROL BRD2 via J1.
The CONVST signal is provided by the EVAL-CONTROL BRD2 via J1.
The RD signal is provided by the EVAL-CONTROL BRD2 via J1.
The CS signal is provided by the EVAL-CONTROL BRD2 via J1.
The AD7470/AD7472 VDRIVE pin is connected to the AD7470/AD7472 DVDD pin.
VDD is supplied by the EVAL-CONTROL BRD2 via J1.
LK6
LK7
LK8
LK9
B
VSS is supplied by the EVAL-CONTROL BRD2 via J1.
LK10
LK11
A
A
The AD7470/AD7472 VIN pin is connected to the output of the bias-up circuit.
Master clock for burst clock generator is provided from the on-board clock oscillator.
Rev. C | Page 4 of 20
EVAL-AD7470/AD7472
EVAL-CONTROL BRD2 INTERFACING
Table 4. 96-Way Connector Pin Functions1
Interface to the EVAL-CONTROL BRD2 via a 96-way
connector, J1. The pinout for the J1 connector is shown in
Figure 2 and its pin designations are given in Table 4.
1
Pin
Row A
Row B
Row C
1
2
D0
32
32
3
D1
A
B
C
4
5
DGND
DGND
D2
DGND
1
6
D3
Figure 2. Pin Configuration for the 96-Way Connector, J1
7
8
9
SCLK0
+5VD
RD
D4
+5VD
D5
SCLK0
+5VD
Table 3. 96-Way Connector Pin Description
Signal Description
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
D6
CS
D0 to
D11
SCLK0
Data Bit 0 to Data Bit 11. Three-state TTL outputs. D11
is the MSB.
Serial Clock Zero. This continuous clock can be
connected to the CLKIN pin of the AD7470/AD7472
via LK3.
Digital +5 V supply. This can be used to provide a
separate +5 V supply for the digital logic if required
via LK2.
Read. This is an active low logic input connected to the
RD pin of the AD7470/AD7472 via LK5.
D7
DGND
D8
DGND
DGND
D9
+5VD
D10
DGND
D11
DGND
FL0
DGND
IRQ2
RD
CS
Chip Select. This is an active low logic input connected
to the CS pin of the AD7470/AD7472 via LK6.
DGND
AGND
AGND
AGND
AGND
AGND
AGND
DGND
AGND
AGND
AGND
AGND
AGND
AGND
AGND
AGND
AGND
AGND
AVSS
DGND
AGND
AGND
AGND
AGND
AGND
AGND
FL0
IRQ2
Flag Zero. This logic input is connected to the CONVST
input of the AD7470/AD7472 via LK4.
Interrupt Request 2. This is a logic output and is
connected to the BUSY logic output on the
AD7470/AD7472.
Digital Ground. These lines are connected to the
digital ground plane on the evaluation board. It
allows the user to provide the digital supply via
the connector along with the other digital signals.
Analog Ground. These lines are connected to the
analog ground plane on the evaluation board.
DGND
AGND
AGND
AGND
AVSS
AVSS
AVDD
AVSS
AVDD
Negative Supply Voltage. This provides a negative
supply to the on-board op amps via LK9.
AVDD
AVDD
Positive Supply Voltage. This provides a positive
supply to the op amps, the reference, the
AD7470/AD7472, and the digital logic.
1The unused pins of the 96-way connector are not shown.
While the AD7470/AD7472 data sheet specifies a maximum
clock frequency of 30 MHz and 26 MHz for the parts, the
DSP and the on-board crystal oscillator output a 20 MHz and
25 MHz clock, respectively. Therefore, the maximum sampling
frequency is less than specified on the data sheet. An external
clock frequency (up to the maximum specified on the data
sheet) can be applied via the external socket, SK1.
Rev. C | Page 5 of 20
EVAL-AD7470/AD7472
In addition, when interfering directly to the EVAL-CONTROL
BRD2, all power supplies and control signals can be generated
by the EVAL-CONTROL BRD2. However, due to the nature of
the DSP interface on the EVAL-CONTROL BRD2, the maxi-
mum AD7470/AD7472 sampling rates supported when
interfacing the EVAL-AD7470/AD7472 directly to the EVAL-
CONTROL BRD2 are shown in Table 5.
OPERATING WITH THE EVAL-CONTROL BRD2
The evaluation board can be operated in a standalone mode or
operated in conjunction with the EVAL-CONTROL BRD2.
This EVAL-CONTROL BRD2 is available from Analog Devices
under the order entry EVAL-CONTROL BRD2. When inter-
facing directly to this control board, all supplies and control
signals to operate the AD7470/AD7472 are provided by the
EVAL-CONTROL BRD2 when it is run under the control of
the AD7470/AD7472 software, which is provided with the
AD7470/AD7472 evaluation board package. This EVAL-
CONTROL BRD2 also operates with all Analog Devices
evaluation boards, which end with the letters CB in their
part number.
Table 5. Maximum Sampling Rates
AD7470
AD7472
3 V
CLK Source
DSP
On-Board CLK
5 V
3 V
5 V
950 kSPS 900 kSPS 850 kSPS 800 kSPS
1.1 MSPS 1.1 MSPS 950 kSPS 950 kSPS
If the EVAL-AD7470/7472CB is run at 3 V, the AD797 and
AD711 input buffers should be changed for a different ones
specified for 3 V power supply, otherwise the input signal is
clipped.
The 96-way connector on the EVAL-AD7470/AD7472 plugs
directly into the 96-way connector on the EVAL-CONTROL
BRD2. No power supplies are required in the system. The
EVAL-CONTROL BRD2 generates all the required supplies for
itself and the EVAL-AD7470/AD7472. The EVAL-CONTROL
BRD2 is powered from a 12 V ac transformer. This is a standard
12 V ac transformer capable of supplying 1 A current and is
available as an accessory from Analog Devices under the
following part numbers:
SOCKETS
There are four input sockets relevant to the operation of the
AD7470/AD7472 on this evaluation board. The function of
these sockets is outlined in Table 6.
Table 6. Socket Functions
Socket Function
•
•
•
EVAL-110VAC-US: For use in the U.S. or Japan
EVAL-220VAC-UK: For use in the U.K.
EVAL-220VAC-EU: For use in Europe
SK1
SK2
SK3
Subminiature BNC socket for external clock input.
Subminiature BNC socket for external CONVST input.
Subminiature BNC socket for bipolar analog input. The
AD7470/AD7472 can only accept analog inputs in the
range 0 V to REFIN. Bipolar analog inputs in the range
−1.25 V to +1.25 V applied to this socket are biased up
to the acceptable AD7470/AD7472 input range by the
on-board bias-up circuit before being applied to the
AD7470/AD7472 VIN pin.
These transformers are also available for other suppliers
including Digi-Key (U.S.) and Campbell Collins (U.K.). A
connection between the EVAL-CONTROL BRD2 and the
serial port of a PC is via a standard printer port cable, which
is provided as part the EVAL-CONTROL BRD2 package. Refer
to the data sheet that accompanies the EVAL-CONTROL BRD2
for more details on the EVAL-CONTROL BRD2 package.
SK5
Subminiature BNC socket for unipolar analog input.
Analog inputs in the acceptable AD7470/AD7472
analog input range (0 V to REFIN) are applied to this
socket. The signal is then buffered before it is applied
to the AD7470/AD7472 VIN pin.
CONNECTORS
The basic connectors on the AD7470/AD7472 evaluation board
are outlined in Table 7.
Table 7. Connector Functions
Connector Function
J1
96-way connector for EVAL-CONTROL BRD2
interface connections.
J2
J3
External VDD, VSS, and AGND power connector.
External VDRIVE and DGND power connector.
Rev. C | Page 6 of 20
EVAL-AD7470/AD7472
EVALUATION BOARD SOFTWARE
Figure 3. The Setup Dialog Box
SETUP SCREEN
RUNNING THE SOFTWARE
Figure 3 shows the setup dialog box. The setup dialog box allows
you to load the required configuration file for the evaluation
board. The configuration file gives the software detailed
information about the AD7470/AD7472 evaluation board and
part connected to the EVAL-CONTROL BRD2 such as number
of bits, maximum sampling rate, output coding, maximum
analog input, and power supply requirements. The configura-
tion file also tells the software the name of the DSP program
file, which should be downloaded to the EVAL-CONTROL
BRD2. These files are supplied by Analog Devices with the
evaluation board.
With the hardware set up, you are now in a position to use the
software to control the EVAL-CONTROL BRD2 and the eval-
uation board. In the main dialog box, select the File menu and
click Setup. This displays the setup form (see Figure 3). A
window on the left of the setup form lists all the available
configuration files. The configuration files are text based files,
which contain information about the particular evaluation board
to be tested. The information covers such things as the part
name, number of samples to be taken, default and maximum
sampling frequency, and power supply settings. The configu-
ration file also contains the name of the DSP program file to be
downloaded to the EVAL-CONTROL BRD2. Select the relevant
configuration file and click Load. The EVAL-CONTROL BRD2
is reset and the DSP program downloaded. When the download
is complete, the power supply settings indicated in the configu-
ration file are set and you may hear some of the relays clicking.
The pull-down menu items such as number of samples and
sampling frequency have been set to the default values specified
by the configuration file. The user is free to change these at will.
Once all the settings have been decided, click Close to return to
the main dialog box.
SETTING UP THE EVAL-CONTROL BRD2
Connect the EVAL-CONTROL BRD2 and evaluation board
via the 96-way connector. Then apply power to the EVAL-
CONTROL BRD2. At this stage, the red LED light should be
flashing to indicate that the EVAL-CONTROL BRD2 is
functional and ready to receive instructions. Load the software
(previously installed) before the printer port cable is connected
between the EVAL-CONTROL BRD2 and the PC. This ensures
that the printer port has been initialized properly. The printer
port cable can then be connected between the PC and the EVAL-
CONTROL BRD2.
Rev. C | Page 7 of 20
EVAL-AD7470/AD7472
STATUS BOXES
MENU BAR
CONTROL
BUTTONS
DIGITAL
STORAGE
OSCILLOSCOPE
(DSO)
FAST
FOURIER
TRANSFORM
(FFT)
Figure 4. Main Dialog Box
SOFTWARE CONFIGURATION FILES
SOFTWARE DESCRIPTION
Software configuration files give the EVAL-CONTROL BRD2
software information on how the software and hardware should
perform. They contain information such as the name of the
DSP program to download, the default and maximum sample
frequencies, the number of samples to take and the power
supply settings to use. A typical software configuration file
(*.cfg) is shown in Listing 1.
Included in the EVAL-AD7470/AD7472 evaluation board
package is a CD that contains software for controlling and
evaluating the performance of the AD7470/AD7472 when it
is operated with the EVAL-CONTROL BRD2. When the CD
is inserted into the PC, an installation program automatically
begins. This program installs the evaluation software onto the
machine and installs the data sheet for the AD7470/AD7472
evaluation board as well as the data sheet for the AD7470/
AD7472. All literature on the CD is in Adobe Systems Inc.’s
portable documentation format (PDF) and requires Acrobat
Reader™ to be viewed or printed. The user interface on the PC
is a dedicated program written especially for the AD7470/
AD7472.
Listing 1
[EVAL-CONTROL BOARD]
partname:AD7472
programname:ad7472.PRG
samplefrequency:100000
maxsamplefrequency:950000
samples:2048
The software which controls the EVAL-CONTROL BRD2 and
thus the AD7470/AD7472 evaluation board has three main
screens. The dialog box in Figure 4 shows what appears when
the software is running. The main function of the screen is to
allow the user to read a predetermined number of samples from
the evaluation board and display them in both the time and
frequency domain.
+/−15V:on
dvdd:5:on
avdd:5:on
bus:on
;options 2scomp, binary
dataformat:binary
numberofbits:12
inputVmax:2.5
inputVmin:0
Rev. C | Page 8 of 20
EVAL-AD7470/AD7472
The upper third of the dialog box contains the control buttons,
the menu bar, and the status windows. The control buttons
allow the user to take samples, reset the part, and quit the
program. The menu bar allows the user to enter the setup
menu, select which printer port is to be used to control the
EVAL-CONTROL BRD2, load and save data, and get informa-
tion about the software. The status window indicates the setup
of the evaluation board/device, the number of samples taken,
and any information or error messages are generated.
Reset Button
The Reset button causes the EVAL-CONTROL BRD2 to
perform a reset function. When this happens, the power
supplies are turned off and the program in DSP memory is
lost. Repeat the setup instructions to download another
program if required.
Quit Button
The Quit button exits the software. The program running on
the EVAL-CONTROL BRD2 is not terminated.
The middle third of the AD7470/AD7472 main dialog box is a
digital storage oscilloscope (DSO). When samples are uploaded
from the EVAL-CONTROL BRD2, they are displayed here. The
samples can be displayed either as integer values or as voltages.
Once the samples are displayed, clicking any point on the graph
displays the sample number and the value of the point directly
beneath the cursor. Along the axis of the graph are the zoom
handles; these allow you to zoom in and out to get a closer look
at a particular sample if required. When another set of samples
is taken the graph attempts to display all values collected unless
the Hold Zoom check box is ticked. If the Hold Zoom box is
ticked, the graph keeps the same axis settings as for the previous
set of data samples. There are additional check boxes in this
section to give you control over the vertical grids, horizontal
grids, and data points.
MENU BAR
The main dialog box of the EVAL-CONTROL BRD2 contains
a number of options available as pull-down menu items.
File Menu
Setup Menu: Displays the setup dialog box as shown in
Figure 3.
Load Raw Data: Allows the user to load data, which had been
saved by the software during a previous session.
Save Raw Data: Allows the user to save the current set of
sample data points. The data can be reloaded to the EVAL-
CONTROL BRD2 software at a later date or can be used by
other programs for further analysis.
Save Binary Data: Allows the user to save the current set of
sample data points. The data is saved in binary format as a text
file. This method can be useful for examining code flicker, and
looking for stuck bits.
The lower third of the dialog box shows either a fast Fourier
transform (FFT) of the data, or a histogram, which shows the
number of occurrences of each particular code read back. The
FFT (the default option) is typically used when you are examin-
ing an ADC’s performance in the frequency domain, while the
histogram gives an indication of the ADC’s performance to DC
signals. The option displayed can be changed by clicking the
FFT Mode/Histogram Mode button in the top right of the
dialog box. Figure 5 shows the main dialog box when histogram
mode is selected.
Save FFT Data: Allows the user to save the current set of FFT
data points. FFT data cannot be reloaded into the EVAL-
CONTROL BRD2 software, but can be loaded into other
software packages for further analysis.
Exit: Quits the program.
Printer Port
Taking Samples
This menu item allows you to select which printer port to use
for communicating with the EVAL-CONTROL BRD2.
Clicking Sample instructs the EVAL-CONTROL BRD2 to take
the required number of samples at the required frequency from
the evaluation board. These samples are then uploaded and
displayed. An FFT and histogram are also calculated and
displayed. If you click Cont Samp, the software repeats the
process indefinitely until the user clicks the button Stop Samp.
While the software is continuously sampling data the other
control buttons are disabled.
LPT1: This option selects 0x378 as the printer port address.
This is the default option.
LPT2: This option selects 0x278 as the printer port address.
PRN: This option selects 0x3BC as the printer port address.
Help
This menu item gives information about the current revision of
software for the particular evaluation board being used.
Rev. C | Page 9 of 20
EVAL-AD7470/AD7472
STATUS BOXES
MENU BAR
CONTROL
BUTTONS
DIGITAL
STORAGE
OSCILLOSCOPE
(DSO)
FAST
FOURIER
TRANSFORM
(FFT)
Figure 5. Main Dialog Box—Histogram Mode
Rev. C | Page 10 of 20
EVAL-AD7470/AD7472
EVALUATION BOARD SCHEMATICS AND ARTWORK
0 0 6 0 - 2 5 0 6
Figure 6. AD7470/AD7472 Evaluation Board Circuit Diagram (ADC Section)
Rev. C | Page 11 of 20
EVAL-AD7470/AD7472
7
0 - 0 0 2 5 0 6
Figure 7. AD7470/AD7472 Evaluation Board Circuit Diagram (Analog Input Bias-Up Section)
Rev. C | Page 12 of 20
EVAL-AD7470/AD7472
0 8 0 0 - 2 5 0 6
Figure 8. AD7470/AD7472 Evaluation Board Circuit Diagram (Burst Clock Generator Section16
Rev. C | Page 13 of 20
EVAL-AD7470/AD7472
Figure 9. Component Side Artwork
Figure 10. Solder Side Artwork
Rev. C | Page 14 of 20
EVAL-AD7470/AD7472
Figure 11. AD7470/AD7472 Evaluation Board Component Placement Drawing (Component Side)
Figure 12. AD7470/AD7472 Evaluation Board Component Placement Drawing (Solder Side)
Rev. C | Page 15 of 20
EVAL-AD7470/AD7472
ORDERING INFORMATION
BILL OF MATERIALS
Table 8.
Qty Reference Designator
Description
Order Number
FEC 498-660
FEC 499-675
FEC 499-687
11
3
C1, C3, C5, C7, C9, C11, C13, C15, C17, C19, C29
C2, C4, C6
10 μF 10 V (TAJ-B series)
0.1 μF 16 V X7R (0603 size)
0.1 μF 50 V X7R (0805 size)
22
C8, C10, C12, C14, C16, C18, C20, C21, C22, C23, C24,
C26, C28, C30, C32, C34, C36, C37, C39, C42, C44, C45
1
1
5
1
2
1
1
2
2
1
3
1
2
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
4
2
1
9
1
11
36
1
1
1
4
1
C25
27 pF 50V NPO (0805 size)
1000 pF 50 V NPO (0805 size)
47 μF 16 V (TAJ-D series)
1 μF 25 V Y5V (0805 size)
22 pF 100 V NPO (0805 size)
4.7 μF 16 V (TAJ-B series)
10 Ω 1 ꢀ (0603 size)
1 kΩ 1 ꢀ (0603 size)
100 Ω 1 ꢀ (0805 size)
100 kΩ 1 ꢀ (0603 size)
20 kΩ 1 ꢀ (0805 size)
51 Ω 1 ꢀ (0805 size)
130 Ω 1 ꢀ (0805 size)
390 Ω 1 ꢀ (0603 size)
0 kΩ Multiturn trimmer potentiometer 5
220 μH inductor (8RHB series)
AD7472ARU/AD7470ARU
NTE74LS14M
FEC 1414683
FEC 317-457
FEC 498-762
C27
C31, C33, C35, C40, C43
C38
FEC 317-640
C46, C49
FEC 317-500
C41
FEC 498-725
R1
FEC 910-995
R2, R3
FEC 911-239
R4, R14
R5
FEC 911-732
FEC 911-471
R6, R15, R16
FEC 771-491
R7
FEC1152422
R11, R12
FEC 771-235
R17
FEC 911-185
R8
FEC 9353640
FEC 598-215
AD7472ARU
L1
U1
U2
FEC349850
U3
AD797BN
AD797BN
U4
OP07DP
OP07DP
U5
AD711KN
AD711KN
U6
U7
AD780AN
DM74LS04M
AD780AN
Digi-Key DM74LS04M-ND
FEC1201314
U8
74HC08M
U9
SN74LS161AD
Digi-Key SN74LS161AD-ND
Digi-Key DM74LS08M-ND
Digi-Key SN74LS112AD-ND
FEC 9712585
FEC 368-118
U10
U11
DM74LS08M
SN74LS112AD
Y1
25 MHz TTL output crystal
1N4148 signal diode
SD103C Schottky diode
2 pin header
D1, D2, D3, D4
D5, D6
Digi-Key SD103CTPMSTR-ND
FEC 511-705
LK1
LK2, LK4, LK5, LK6, LK7, LK8, LK9, LK10, LK11
4- pin (2 + 2) header
8-pin (4 + 4) header
Shorting link
FEC 511-791
LK3
FEC 511-780
LK1 to LK11
FEC 1097975
FEC 519-959
U3, U4, U5, U6, Y1
Ultra low profile sockets
96-pin 90° DIN41612 plug
3-pin terminal block
2-pin terminal block
Gold 50 W SMB jack
PCB
J1
FEC 1096905
FEC 151-786
J2
J3
FEC 151-785
SK1, SK2, SK3, SK5
EVAL-AD7470/AD7472CB
FEC 1206013
N/A
Rev. C | Page 16 of 20
EVAL-AD7470/AD7472
ORDERING GUIDE
ESD CAUTION
Model
Description
EVAL-AD7470CB
EVAL-AD7472CB
AD7470 Evaluation Board
AD7472 Evaluation Board
Rev. C | Page 17 of 20
EVAL-AD7470/AD7472
NOTES
Rev. C | Page 18 of 20
EVAL-AD7470/AD7472
NOTES
Rev. C | Page 19 of 20
EVAL-AD7470/AD7472
NOTES
©2007 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
EB06250-0-10/07(C)
Rev. C | Page 20 of 20
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