EVAL-AD73360LEB [ADI]
AD73360L Evaluation Board, Six Input Channel Analog Front End; AD73360L评估板， 6路输入通道模拟前端
| 型号： | EVAL-AD73360LEB |
| 厂家： | 
ADI |
| 描述： | AD73360L Evaluation Board, Six Input Channel Analog Front End |
| 文件： | 总9页 (文件大小：287K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
AD73360(L)EvaluationBoard,
a
SixInputChannelAnalogFrontEnd
EVAL-AD73360(L)EB
SE T T ING UP T H E E VALUAT IO N BO ARD F O R T H E
F IRST T IM E
T he AD73360(L) evaluation board kit comes with the
evaluation board for the required part, AD73360 or
AD73360L and software which allows the user to program
the AD73360(L) and read back samples using a PC. T he
software is provide on a CD ROM and this also contains a
data sheet, this technical note and some DSP example
code. T he user needs to supply a Centronics printer port
cable and a 6V to 12V DC power supply.
FEATURES
Full-Featured Evaluation Board for the
AD73360 & AD73360L
Stand Alone Operation
On-Board DSP
High-Speed Parallel Interface to the PC
PC Softw are for Control and Data Analysis.
In sta llin g th e Softwa r e
I N T R O D U C T I O N
When the CD ROM is inserted into the PCs drive the
install routine automatically starts. T his allows the user to
select which components to install i.e. data sheet, techni-
cal note, application software etc. When using the software
to control the evaluation board it is important the follow-
ing steps are completed in order.
T his T echnical Note describes the evaluation board for
the both AD73360 and the AD73360L six input-channel
simultaneous sampling sigma-delta A/D converters. T he
AD73360L is a 3V only version of the AD73360. Full
data on the both parts is available in the relevant data
sheet available from Analog Devices and should be con-
sulted in conjunction with this T echnical Note when using
the Evaluation Board.
1. T he evaluation board should be powered up with the
printer port cable disconnected.
2. T he software should be loaded.
T he evaluation board allows a user to exercise all the
functions of the AD73360(L). T he analog inputs are buff-
ered by op-amps which may be configured for ac- or dc-
coupling operation. T he evaluation board contains an
ADSP2185L digital signal processor which can be pro-
grammed to control and read data from the AD73360(L).
T he evaluation board comes with software which can be
run on the users PC allowing programs to be downloaded
and data to be uploaded from the evaluation board. Sev-
eral example programs are provided which demoonstrate
the capabilities of the AD73360(L).
3. T he printer port cable can then be connected and the
PC should be able to communicate with the evaluation
board.
FUNCTIONAL BLOCK DIAGRAM
Signal
Cond itioning
Signal
Cond itioning
Signal
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Signal
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Signal
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Signal
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Inform ation furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assum ed by Analog Devices for its
use, nor for any infringem ents of patents or other rights of third parties
which m ay result from its use. No license is granted by im plication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood. MA 02062-9106, U.S.A.
Tel: 617/329-4700
Fax: 617/326-8703
EVAL-AD73360(L)EB
Table III. Master Clock Selection
System Req u ir em en ts
Pentium 90 IBM Compatible PC
Link
P osition
A1
B
MCLK Frequency
LK 5
16.384M H z
F out
Windows 95
4Mbytes H ard Disk Space
Bidirectional Printer Port (PS/2, EPP, ECP)
1. Default Link Position
Tabel IV. Refer ence Selection
O P E RAT ING T H E AD 73360(L) E VALUAT IO N BO ARD
P ower Su pply
Link
P osition
Function
T he AD73360(L) evaluation board can be powered from
any +9 V to +12 V DC power supply connected to J10 on
the board. T his supply is regulated to +5 V to power the
PC interface section of the board and also regulated to
+3.2 V to power the DSP and AD73360(L) sections. T he
analog section of the AD73360 can also be powered from
+5 V if required. T his should only be done when the
AD73360 is used in the evaluation board.
LK 6
IN 1
O U T
External Reference
Internal Reference
1. Default Link Position
Tabel V. Voltage Selection for AD 73360(L)
Link
P osition
Function
When power is applied the POWER LED D4 should be
lit indicating that the power connector is correctly polar-
ized. Also the LED connected to FL2 should begin to
flash on and off indicating that the DSP has booted from
the on-board flash EPROM correctly.
LK 7
A
+5V Analog Section
+3V Analog Section
B1
1. Default Link PositionEvaluation Board Software
When the evaluation board has been powered up the PC
software can be loaded and the printer port connector can
be connected. the PC should now be able to communicate
with the evaluation board.
E VALU AT IO N B O ARD SO F T WARE
T he evaluation board comes with software which will al-
low the user to operate the various functions of the
AD73360(L). T here are two main sections to the com-
plete software package. One runs on the PC and handles
all the communications between the PC and the evaluation
board. T he PC software can be used to load a DSP based
program to the evaluation board which is specifically writ-
ten to operate the AD73360 in a required manner. T he
second section of the software is the DSP programs.
T hese are loaded to the ADSP2185L on the evaluation
board. T he programs are designed to allow the user to
gather data from the AD73360 and upload it from to the
PC to be saved or analysised. T he DSP example programs
can be modified and recompiled to meet the needs of the
users end application if necessary.
Lin k Settin gs
T he AD73360(L) evaluation board has a number of link
options which can be used to select the various operating
conditions of the evaluation board. T he linking options
are described in detail below.
Table I. Inter face Mode Selection
Link
P osition
Function
LK 1
A1
Frame-Sync Loop
Back
B
N on Frame-Sync
Loop Back
P C Softwar e D escr iption
When the user runs the software they are presented with
a
1 Default Link Position
selection screen where the user can determine if they want
to use the Basic or Demonstration Mode options. T he
Selection Screen is shown in Figure 1.
Table II. Cr ystal Fr equency Selection
LK2
LK3
LK4
Fout
2
I N
I N
I N
I N
O U T
O U T
O U T
O U T
I N
I N
O U T
O U T
I N
I N
O U T
O U T
I N
O U T
I N
O U T
I N
O U T
I N
Fo/21
F o/4
F o/8
F o/16
F o/32
F o/64
F o/128
F o/256
O U T
1 Fo=16.384MHz
2 Default Link Positions
Figure 1. Selection Screen
–2 –
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EVAL-AD7360(L)EB
Figure 2. The Basic Mode Screen
Men u Item D escr iption s
When running the software for the very first time it is
advisable to select the Basic screen as this will allow the
user to verify that the PC is communicating with the
evaluation board and vice versa. T he Basic Screen is
shown in Figure 2. T he user should click on the Get Soft-
ware Version button to establish if the communications are
working. If they are the user should see a message box
similar to that of Figure 3.
File Menu:
Sa ve Da ta : T he user can save the ADC samples taken
by the AD73360(L). T he samples are saved to a text file
which can be opened by programs such as Notepad, Excel
or Mathcad for further examination/analysis.
Sa ve FFT Da ta : T he user can save the results of the
FFT s performed on the ADC data. T he data is saved to a
text file which can be opened by programs such as
Notepad, Excel or Mathcad for further examination/analy-
sis.
Loa d Da ta : T he user can reload previously saved data
into the program . T he program will display the ADC
samples and recalculate the FFT for each channel.
O ptions Menu:
Run On Downloa d: Selecting this option will automati-
cally run any program which is downloaded to the DSP. If
this option is deselected the Run button must be pressed in
order to start the DSP program.
Figure 3. Software Version Message Box
AD73x60 Options: T his option allows the user to select
the Sample Rate used by the DSP program, the number of
ADC samples to be taken by each channel and the Fre-
quency Band of Interest over which to calculate the SNR
for each channel.
AD73x60 Options: Selecting this option causes the
evaluation board to be reset.
Printer Port: T his option allows the user to select which
printer port the software should use to communicate with
the evaluation board. By default LPT 1 is chosen.
T he additional functions available in this screen will be
described later in this document.
D E M O NS T R AT IO NS S C R E E N
T he Demonstrations Screen will allow the user to select
one of a number of demonstration programs which will
program the AD73360(L) and read data from one or more
selected channels. Figure 4 shows the Demonstrantions
Screen.
–3 –
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EVAL-AD73360(L)EB
Figure 4. The Dem onstration Screen
and change the number of samples to take. Note that the
D em on st r a t ion P r ogr a m s
number of samples which can be taken is limited to the
amount of data memory available in the DSP and the
number of ADC channels selected. T he number of
samples selected should not exceed 16000/N where N is
the number of ADC channels. Figure 5 shows the
AD 73x60 options window.
T he demonstration programs provided with the
AD73360(L) evaluation board allow the user to program
the device and read data from one or more channels. T he
samples are automatically uploaded and graphed once they
have been acquired. In addition a Fast Fourier T ransform
(FFT ) is performed and the Signal to Noise+Distortion
Ratio (SNR+D) is calculated for all selected channels.
T he demonstration programs sample data at either 8KHz
or 64KHz. T he DSP source code for each demonstration
program is included and can be modified and recompiled
if required1.
Ru n n in g a D em on str a tion P r ogr a m
With the evaluation board powered up and connected to
the PC the user can download the required program to the
evaluation board by pressing the D ownload P r ogr am
button. T his will display a dialog box from which the user
can select the required program. When the OPEN button
is clicked the evaluation board is reset and the program is
downloaded. If the Run on D ownload option is not se-
lected the user must click the Run button to start the pro-
gram running. T he user should ensure that the correct
sample rate is selected by clicking on the O ptions/AD 73x60
O ptions menu item. T he user also has the option to alter
the band of interest over which the SNR+D is calculated
Figure 5. The AD73x60 Options Window
1 Recompiling DSP source code requires the ADSP21xx assembler and linker
tools.
–4 –
REV. 0
EVAL-AD7360(L)EB
When the DSP program is running the user can click
T ake Samples. T his will cause the the PC to send a com-
mand to the DSP on the evaluation board. T he DSP will
bring the SE and RESET lines of the AD73360(L) high
and begin programming the device. T he AD73360(L) is
configured in Frame-Sync Loop Back and is programmed
to operate in Data Mode. After allowing some time for the
reference to settle the AD73360(L) will store the required
number of samples to the data memory of the DSP. Once
completed the DSP will bring the RESET and SE of the
AD73360(L) low and begin uploading the data to the PC.
When the data has been transferred the PC will graph the
data and calculate the FFT . It should be noted that the
number of channels selected at the top of the demonstra-
tion window should match the number of ADC channels
powered up on the AD73360(L).
Figure 6. the Upload Data Screen
T H E BASIC MO D E SC RE E N
T he Basic Mode Screen as shown in Figure 2 allows the
user to download their own programs to the evaluation
board, send it commands and upload data memory for
saving or analysis.
D own loa d in g P r ogr a m s
T he user has the option of downloading a program to the
evaluation board in one of two ways. T he first is to down-
load the program but not to run it until the Run button is
clicked. T he second is to download and automatically run
the program. If the user is using a modified version of the
BASIC.DSP program the LED on FL2 will flash a num-
ber of times to indicated that the program has been down-
loaded and run successfully.
S en d in g C om m a n d s
A command can be sent to the evaluation board which can
be used to determine which action is to be performed. T he
command is made up of an Identifier Byte and a 16 bit
Control Word. T he Identifier Byte is stored in data
memory location 0x3FDB and the Control Word is stored
in data memory location 0x3FDA. T he BASIC.DSP pro-
gram will read the Identifier Byte and flash the LED that
number of times.
U p loa d in g D a ta
If the user has acquired ADC data from the AD73360(L)
which is stored in data memory it can be uploaded to the
PC. Clicking the Upload D ata button will display the
screen shown in Figure 6. T he user can select the start
address and the number of words to upload. T he uploaded
data can be saved to a file or to a list box on the Basic
Mode Screen. T he user also has the option to save/display
the data in decimal or hexidecimal format.
Reset Boar d
T his button allows the user to reset the evaluation board if
required.
Get Softwar e Ver sion
T his button will read the version number of the boot pro-
gram which is store on the evaluation board. T his is a
useful indication that the communication routines are fully
working as it involves 2-way communication to be suc-
cessful.
–5 –
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EVAL-AD73360(L)EB
Figure 7. Evaluation Board Schem atic
–6 –
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EVAL-AD7360(L)EB
Figure 8. Evaluation Board Schem atic (cont'd)
–7 –
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EVAL-AD73360(L)EB
Table VI. Tr oubleshooting guide
Sym ptom
P ossible Cause
Both LEDs Off
No power is applied to the evaluation board. T he evaluation board requires a +9V to
+12V DC supply.
Power LED On but
FL2 LED not flashing
T he DSP has not booted properly. Remove the printer port cable, if connected, and
press the RESET button.
N o Communication between
PC and Evaluation Board.
T here are a number of possible causes for a communications failure. T hese are listed
below.
1. Cable not connected or incorrect cable type. T he cable should be a fully-populated
Centronics printer port cable.
2. Incorrect printer port. T he evaluation board requires that the printer port has bi-
directional capability. Acceptable types are PS/2, EPP and ECP.
3. Correct Printer Port but bidirectional capability not enabled. It is possible that a
bidirectional printer port can be set to be unidirectional mode in the PC BIOS.
T he user should consult the PC manual for instructions on examining the BIOS
4. Incorrect Printer Port Address. T here are three possible addresses for a printer
ports and the one fitted to a users PC may not be the same as the default address.
T his can be changed using the Printer Port menu item.
D emonstration Programs
T im eout
T he AD73360(L) may not be acquiring samples. Verify that the correct link positions
are selected. Also verify that the SE and RESET are being brought high and that the
the AD73360(L) is giving out the correct number of Frame Syncs per sample period
once it is in program mode.
Verify that the AD73360(L) is receiving an MCLK signal.
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EVAL-AD7360(L)EB
Table Vii. Bill of Mater ials
Qty
Reference
D escription/P art Nam e
AD SP 2185LLK ST -133
1
U 1
1
1
1
1
2
1
1
1
U 2
U 3
U 4
U 5
U 6
U 7
U 8
U 9
AD 73360LAR or AD 73360AR
LM 7805C T
AM 29LV004BB-90EC
74VH C 57M
74LC X574WM
74LVX02M
74LVX32M
74LVX74M
N C 7S14M 5
AD 8062AR
4
6
U 10 U 20-22
U 11-16
1
U 17
AD 820AR
1
1
1
U 18
U 19
U 23
16.384M H z Programmable Oscillator
AD P3303AR-3.2
AD 589LH
17
28
2
R1-R3 R7-R10 R15-R17 R23-R29
R4 R6 R11-R14 R20 R21 R35-R54
R5 R22
100KΩ
10KΩ
820Ω
1
R18
330KΩ
2
R19 R30
220KΩ
1
R31
5.6KΩ
3
13
L1-3
SM D Inductor
10uF
C5 C6 C10-C12 C20 C23 C26 C28
C30 C32 C34 C36
C19 C20
2
2
0.47µF
22pF
C1 C2
25
C3 C4 C7-C9 C13 C16 C18 C22
C24-25 C27 C29 C31 C33 C35 C37
C 60-C 65 C 67
0.1µF
12
C14 C15 C40 C41 C44 C45 C48
C49 C52 C53 C56 C57
470pF
2
C21 C66
220nF
12
C38 C39 C42 C43 C46 C47 C50
0Ω Res to be fitted
C51 C54 C55 C58 C59
1
1
6
1
1
3
4
7
J1
J2
J3-8
J9
Centronics Connector
20 Way IDC Header
Pin Power Connector
26 PIN ED G E C ON N EC T OR
BARREL C O N N EC T O R
JUM PER BLOCK USIN G 3 PIN SIP H EAD ER
JUM PER BLOCK, 2 PIN S 0.1 SPACIN G”
Shorting Plug
J10
LK1 LK5 LK7
LK2-4 LK6
LK1-7
D 1
3mm Red LED
2
2
1
2
1
D 4
D 2-3
Q 1
S1-2
Y1
3mm Green LED
1N 4001 D iode
2N 2222 SM D T ransistor
Push Button Switch (sealed 6mm x 6mm)
20M H z C rystal
–9 –
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