Cirrus CDB5511 Evaluation board and software Datasheet

CDB5510/11/12/13
CDB5510/11/12/13 Evaluation Board and Software
Features
General Description
! Supports the CS5510, CS5511, CS5512, and
The CDB5510/11/12/13 is an inexpensive tool designed
to evaluate the performance of the CS5510/11/12/13 8pin Analog to Digital Converters. This document, as well
as the CS5510/11/12/13 data sheet should be read thoroughly before using the CDB5510/11/12/13 Evaluation
System.
CS5513 8-pin ADCs
! On-board Oscillator (CS5510/12)
! RS-232 Serial Communication with PC
! On-board Microcontroller
! On-board Voltage Reference
! LabWindows/CVI Evaluation Software
The evaluation system consists of a CDB5510 Board
and PC software which allows the user to easily capture
and analyze data. The provided analysis functions in the
software include Time Domain Analysis, Histogram
Analysis, and Frequency Domain Analysis.
– Chip Control and Data Capture
– FFT Analysis
– Time Domain Analysis
– Noise Histogram Analysis
! Includes
CDB551x, CS551X sample, and
Software
V-
ORDERING INFORMATION:
CDB5510/11/12/13
Evaluation System
Includes CDB5510 and One Sample
GND
V+
VOLTAGE
REFERENCE
DIP
SWITCHES
V+
LEDs
VREF
VV-
AIN+
AIN-
VREF
AIN+
AIN-
CS5510
CS5511
CS5512
CS5513
AT90S8515
CS
MICROCONTROLLER
SDO
RS232
TRANSCEIVER
SCLK
RESET
CIRCUITRY
CRYSTAL
3.6864 MHz
RS232
CONNECTOR
OSC.
CIRCUITRY
Preliminary Product Information
P.O. Box 17847, Austin, Texas 78760
(512) 445 7222 FAX: (512) 445 7581
http://www.cirrus.com
This document contains information for a new product.
Cirrus Logic reserves the right to modify this product without notice.
Copyright  Cirrus Logic, Inc. 2001
(All Rights Reserved)
OCT ‘01
DS337DB2
1
CDB5510/11/12/13
TABLE OF CONTENTS
1. HARDWARE ............................................................................................................................. 3
1.1 Introduction ........................................................................................................................ 3
1.2 Power Supply Options ....................................................................................................... 3
1.3 Analog Inputs ..................................................................................................................... 3
1.4 Voltage Reference Options ................................................................................................ 3
1.5 Clocking Options ................................................................................................................ 4
1.6 PC Interface ....................................................................................................................... 5
1.7 Adding an Amplifier to the CDB5510 ................................................................................. 5
1.8 Interfacing to an External Controller .................................................................................. 5
2. SOFTWARE .............................................................................................................................. 6
2.1 Installation Procedure ........................................................................................................ 6
2.2 Using the Software ............................................................................................................. 6
2.2.1 Selecting the COM Port and Part .......................................................................... 6
2.2.2 Setup Window Functions ...................................................................................... 6
2.3 Data Collection Window Overview ..................................................................................... 8
2.3.1 Histogram Plots ..................................................................................................... 9
2.3.2 Frequency Domain (FFT) Plots ............................................................................. 9
2.3.3 Time Domain Plots .............................................................................................. 10
3. SCHEMATICS ........................................................................................................................ 14
LIST OF FIGURES
Figure 1. Title Screen .................................................................................................................... 10
Figure 2. Setup Window ................................................................................................................ 11
Figure 3. Frequency Domain Analysis .......................................................................................... 12
Figure 4. Configuration Panel........................................................................................................ 12
Figure 5. Time Domain Analysis ................................................................................................... 13
Figure 6. Histogram Analysis ........................................................................................................ 13
Figure 7. CDB5510 Power Supply Schematic............................................................................... 14
Figure 8. CDB5510 Reference and ADC Schematic..................................................................... 15
Figure 9. CDB5510 Amplifier Schematic (not populated).............................................................. 16
Figure 10. CDB5510 Microcontroller Schematic ........................................................................... 17
Figure 11. CDB5510 RS232 and Oscillator Schematic................................................................. 18
Figure 12. CDB5510 Silkscreen Layout ........................................................................................ 19
Figure 13. CDB5510 Top Side Layout .......................................................................................... 20
Figure 14. CDB5510 Bottom Side Layout ..................................................................................... 21
Contacting Cirrus Logic Support
For a complete listing of Direct Sales, Distributor, and Sales Representative contacts, visit the Cirrus Logic web site at:
http://www.cirrus.com/corporate/contacts
LabWindows and CVI are registered trademarks of National Instruments Corporation, MICROWIRE is a trademark of National Semiconductor Corporation, SPI
is a registered trademark of International Business Machines Corporation, Windows 95 is a registered trademark of Microsoft Corporation.
Preliminary product information describes products which are in production, but for which full characterization data is not yet available. Advance product information describes products which are in development and subject to development changes. Cirrus Logic, Inc. has made best efforts to ensure that the information
contained in this document is accurate and reliable. However, the information is subject to change without notice and is provided “AS IS” without warranty of any
kind (express or implied). No responsibility is assumed by Cirrus Logic, Inc. for the use of this information, nor for infringements of patents or other rights of third
parties. This document is the property of Cirrus Logic, Inc. and implies no license under patents, copyrights, trademarks, or trade secrets. No part of this publication may be copied, reproduced, stored in a retrieval system, or transmitted, in any form or by any means (electronic, mechanical, photographic, or otherwise)
without the prior written consent of Cirrus Logic, Inc. Items from any Cirrus Logic website or disk may be printed for use by the user. However, no part of the
printout or electronic files may be copied, reproduced, stored in a retrieval system, or transmitted, in any form or by any means (electronic, mechanical, photographic, or otherwise) without the prior written consent of Cirrus Logic, Inc.Furthermore, no part of this publication may be used as a basis for manufacture or
sale of any items without the prior written consent of Cirrus Logic, Inc. The names of products of Cirrus Logic, Inc. or other vendors and suppliers appearing in
this document may be trademarks or service marks of their respective owners which may be registered in some jurisdictions. A list of Cirrus Logic, Inc. trademarks and service marks can be found at http://www.cirrus.com.
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DS337DB2
CDB5510/11/12/13
1. HARDWARE
1.3 Analog Inputs
1.1 Introduction
Analog input signals can be connected to the converter’s inputs via the CDB5510’s AIN+ and AINinputs (connector J3). Note that a simple RC network filters the input to reduce broadband noise.
Both of the analog inputs can also be tied to the Vsupply by changing the position of HDR4 and
HDR5, or to the output of the amplifier section as
shown in Table 1. For a differential input the jumpers should be set to the “Direct Differential Input”
setting, and for a single-ended input on AIN+, the
jumpers should be set to the “Direct Single-Ended
Input” setting. The jumpers can also be set to configure an amplifier input, if it is installed on the
evaluation board. The amplifier section of the
board is discussed in more detail in section 1.7.
The CDB5510/11/12/13 evaluation system provides a quick means of testing the
CS5510/11/12/13 Analog-to-Digital Converters
(ADCs). The CDB5510 evaluation board accepts
any of the four converters via an 8-pin SOIC socket, and interfaces directly to a PC running though
an RS-232 serial interface.
The included analysis software allows the user to
control
the
various
functions
of
the
CS5510/11/12/13, as well as capture and save data.
The software also provides data analysis tools to
display the time domain, frequency domain, and
noise histogram performance for a captured set of
data.
1.2 Power Supply Options
The CS5510/11/12/13 ADCs are designed to operate from a supply voltage difference of 5 to 6 V between V+ and V-. The parts may be run from a
single 5 V supply, or any combination of voltages
that produce a 5 V span, such as +3 V and -2 V or
± 2.5 V. The CDB5510 evaluation board supports
both single and dual supply configurations. For a
single supply, both the V- and GND posts should
be connected to 0 V, and the V+ post should be
connected to the positive supply voltage. For dual
supply configurations, the GND post should be
connected to 0 V, the positive supply should be
connected to the V+ post, and the negative supply
should be connected to the V- post. Because the
RS-232 transceiver used on the board requires at
least 3 V for its supply voltage, it is recommended
that the V+ post always be at least 3 V for proper
operation of the evaluation board. If a different microcontroller is interfaced to the CS5510/11/12/13
through HDR6, other supply voltages may be used.
DS337DB2
Input
HDR4
HDR5
Direct
Differential
Input
AIN+ O
AMP+ O
V- O
O AIN+
O AIN+
O AIN+
AIN- O
AMP- O
V- O
O AINO AINO AIN-
Direct
Single-Ended
Input
AIN+ O
AMP+ O
V- O
O AIN+
O AIN+
O AIN+
AIN- O
AMP- O
V- O
O AINO AINO AIN-
Differential
Amplifier
Input
AIN+ O
AMP+ O
V- O
O AIN+
O AIN+
O AIN+
AIN- O
AMP- O
V- O
O AINO AINO AIN-
Single-Ended
Amplifier
Input
AIN+ O
AMP+ O
V- O
O AIN+
O AIN+
O AIN+
AIN- O
AMP- O
V- O
O AINO AINO AIN-
Table 1. Analog Input Selection With HDR4 and HDR5
1.4 Voltage Reference Options
The evaluation system provides three voltage reference options. The VREF pin can be connected to
the on-board 2.5V reference, to the positive supply
rail, or to an external voltage reference source via
HDR3, as shown in Table 2. When the HDR3
jumper on the CDB5510 is in the”V+” position, the
eval board’s supply voltage is selected. When this
jumper is in the “LT1019” position, the on-board
reference provides an absolute voltage level of 2.5
volts (the LT1019 was chosen for its low drift, typ3
CDB5510/11/12/13
ically 5ppm/°C). By setting HDR3’s jumper to the
“REF” position, the user can supply an external
voltage reference to J1’s REF input. V- is also provided at connector J1 to allow an easy connection
to the negative supply. (Application Note 4 on Cirrus Logic’s web site details various voltage references).
Reference
Description
HDR3
V+
Selects Analog
Power Supply
V+ O
LT1019 O
REF O
O VREF
O VREF
O VREF
LT1019
Selects on board
LT1019 Reference
(5ppm/°C)
V+ O
LT1019 O
REF O
O VREF
O VREF
O VREF
Selects external
EXTERNAL reference source
connected to J1
V+ O
LT1019 O
REF O
O VREF
O VREF
O VREF
Table 2. Voltage Reference Selection Using HDR3
1.5 Clocking Options
The CS5510/11/12/13 are very simple ADCs, intended to continuously convert and output data
when not in sleep mode. The CS5510 and CS5512
require an external clock signal on the SCLK input
pin to run properly. The CDB5510 evaluation
board provides three options for this clock source:
1) The microcontroller can be used to generate a
clock for the CS5510/12. The microcontroller’s
clock can be selected by removing the jumper from
HDR7 on the CDB5510 board, and selecting the
“CS5510/12 Clock from microcontroller” option in
the software. The DIP switches on the evaluation
board should be set as shown in the “CS5510/12
Clock from 8515” section of Table 3. The clock
frequency can be selected by changing the “Oscillator Frequency” box in the software. Note that the
frequency options are limited by the microcontroller’s counter/timer circuitry, which divides the
3.6864 MHz clock by integer values to produce the
clock output.
4
2) The 32 kHz on-board oscillator circuit (shown in
Figure 11) can be used by connecting HDR7 on the
CDB5510 board and selecting the “On-board or external clock source” option in the software. The
DIP switches on the evaluation board should be set
as shown in the “CS5510/12 External Clock” section of Table 3.
3) An external clock can be provided by the user,
and connected to the SCLK post on HDR7. The
“On-board or external clock source” option in the
software should be selected when using an external
clock source, and the DIP switches on the evaluation board should be set as shown in the
“CS5510/12 External Clock” section of Table 3.
The CS5511 and CS5513 include an internal oscillator, and as such, need no external oscillator to
run. When using the CS5511 or CS5513, HDR7 on
the CDB5510 board should be left disconnected,
and the “CS5511/13 Internally Clocked” option
should be selected in the software. Likewise, the
Eval Board Mode
SW1 Settings
CS5511/13 Internally Clocked
X is OPEN
A is OPEN
B is OPEN
1
2
3
OPEN
X A B
CS5510/12 Clock From 8515
X is OPEN
A is CLOSED
B is CLOSED
1
2
3
OPEN
X A B
CS5510/12 External Clock
X is OPEN
A is OPEN
B is CLOSED
1
2
3
OPEN
X A B
RS-232 Test Mode
X is CLOSED
A is CLOSED
B is CLOSED
1
2
3
OPEN
X A B
Table 3. DIP Switch Settings
DS337DB2
CDB5510/11/12/13
DIP switches on the CDB5510 should be set to the
“CS5511/13 Internally Clocked” section of Table
3.
1.6 PC Interface
The evaluation system comes with software and an
RS-232 cable to link the evaluation board to the
PC. The executable software was developed with
LabWindows/CVI and meant to run under Windows 95 or 98. After installing the software, read
the readme.txt file for any last minute changes in
the software. Additionally, Section 2.0: Software
in this document further details how to install and
use the software.
1.7 Adding an Amplifier to the CDB5510
The CDB5510 is laid out so that a standard 8-pin
SOIC dual op-amp of the user’s choosing can be installed on the board to allow evaluation of the
CS5510/11/12/13’s performance with an op-amp
front-end. If an op-amp front-end is desired, the additional components such as feedback resistors and
bypass capacitors must also be installed on the
board. A schematic of the amplifier section including some typical component values is shown in
Figure 9. The amplifier is configured to operate in
either a single non-inverting, or a dual differential
configuration. The mode of operation can be selected by changing the jumper on HDR2. Using the
components shown in Figure 9, the gain of the am-
DS337DB2
plifier will be 10 in the single configuration, or 21
in the dual configuration. Different gain values can
be achieved by changing the value of resistors R6,
R17, and R18.
1.8 Interfacing to an External Controller
The ADC serial interface is SPI and MICROWIRETM compatible. The interface control lines (CS,
SDO, and SCLK) are connected to the 8515 microcontroller on the CDB5510. The ADCs can be interfaced to an external microcontroller through
HDR6 on the CDB5510. To accomplish this, the
CDB5510 board must be modified in one of three
ways: 1) remove the microcontroller from its socket, 2) remove resistors R20-R22, or 3) cut the interface control traces between the microcontroller and
the header.
5
CDB5510/11/12/13
2. SOFTWARE
user is prompted to select the serial communication
port.
2.1 Installation Procedure
1) Turn on the PC, running Windows 95 or 98.
2.2.1 Selecting the COM Port and Part
2) Insert the Installation Diskette #1 into the PC.
3) Select the Run option from the Start menu.
To initialize a port, pull down option ComPorts
from the menu bar and select either COM1 or
COM2. Next, the user is prompted to select the appropriate part under the Parts menu. After a port is
initialized and the correct part is selected, it is a
good idea to test the RS-232 link between the PC
and the evaluation board. To do this, pull down the
Setup menu from the menu bar and select the option TESTRS232. The user is then prompted to set
the evaluation board’s test switches to 111 and then
reset the board. Once this is done, proceed with the
test. If the test fails, check the hardware connection
and repeat again. Otherwise, set the test switches
back to the correct mode as specified in this document, and press reset again.
4) At the
<enter>.
prompt,
type:
A:\SETUP.EXE
5) The program will begin installation.
6) If it has not already been installed on the PC,
the user will be prompted to enter the directory in which to install the CVI Run-Time
Engine. The Run-Time Engine manages executables created with LabWindows/CVI. If
the default directory is acceptable, select OK
and the Run-Time Engine will be installed
there.
7) After the Run-Time Engine is installed, the
user is prompted to enter the directory in
which to install the Eval5510/11/12/13 software. Select OK to accept the default directory, or choose an alternate directory.
8) Once the program is installed, it can be run by
double clicking on the Eval5510/11/12/13
icon, or through the Start menu.
Note: The software is written to run with 640 x 480 resolution; however, it will work with 1024 x 768 resolution.
If the user interface seems to be a little small, the user
might consider setting the display settings to 640 x 480.
(640 x 480 was chosen to accommodate a variety of
computers).
2.2 Using the Software
At start-up, the title screen appears first (Figure 1).
This window contains information concerning the
software’s title, revision number, copyright date,
etc. Additionally, at the top of the screen is a menu
bar which displays user options. Notice, the menu
bar item Window is initially disabled. This eliminates any conflicts with the mouse or concurrent
use of modems. Before proceeding any further, the
6
2.2.2 Setup Window Functions
To make sure that the software and evaluation
board are set up correctly, it is recommended that
the user proceed to the Setup Window and test the
functionality of the part before proceeding (Figure
2). To access the Setup Window, the user can pull
down the Window menu item, or press F1 on the
keyboard. The following describes the various options and indicators in the Setup Window.
Clocking Options: This pull-down menu allows
the user to select the type of clock that will be used
with the ADC, so that the software knows what to
expect from the microcontroller. Selecting from
this menu also gives the user the DIP switch options that they must set on the evaluation board.
There are three options available on this menu:
CS5511/13 Internally Clocked - This option means
that a CS5511 or CS5513 is being used, and the microcontroller will only provide an SCLK when
clocking data from the ADC. Be sure that no jumper is installed on HDR7 of the CDB5510 when this
DS337DB2
CDB5510/11/12/13
option is selected, or the board will not function
properly.
CS5510/12 Clock from Microcontroller - This option tells the software that a CS5510 or CS5512 is
being used, and that the microcontroller will provide the ADC with a master clock. The microcontroller’s clock frequency is user-selectable from the
Setup Window. The clock frequency is limited to
integer sub-multiples of the microcontroller’s
3.6864 MHz master clock (3.6864 MHz / N). Be
sure that no jumper is installed on HDR7 of the
CDB5510 when this option is selected, to avoid
contention with the on-board oscillator.
CS5510/12 On-Board or External Clock Source This option tells the software that a CD5510 or
CS5512 is being used, and that the master clock
from the part will be coming from an outside
source. If the on-board 32 kHz oscillator is to be
used as the clock source, a jumper should be installed on HDR7 of the CDB5510. If a different
clock source is to be used, no jumper should be installed, and the clock source should be connected to
the pin labeled SCLK (the top pin) of HDR7 or to
the pin labeled SCLK (the lower-left pin) on
HDR6.
Oscillator Frequency: This box displays the frequency of the oscillator that the ADC is running on.
When using an external clock source, the user can
type in the frequency of the clock source, and the
FFT plots will scale accordingly. When using the
microcontroller as a clock source, the user should
adjust this value until it is close to the desired frequency. The value in this box will automatically be
adjusted to a frequency that the microcontroller can
provide. When using a CS5511 or CS5513, the
“Get Internal Freq.” option should be used to determine the converter’s internal oscillator frequency.
Sampling Frequency: This box displays the computed sampling frequency for the specified oscillator frequency. This number is used when
performing FFT analysis.
DS337DB2
Sleep Mode: This button allows the user to put the
ADC in sleep mode. The microcontroller will set
SCLK high, and the ADC will power down according to the data sheet specifications. If an external
clock or the on-board oscillator is used, this option
should remain off.
Get Internal Freq.: This button is only visible
when the CS5511 or CS5513 is being used. When
pressed, the microcontroller will time the conversion cycle of the ADC and the PC software will
compute the sampling rate and oscillator frequency
based on the results. This button should be pressed
when using a CS5511 or CS5513 before collecting
data to ensure that any FFT plots are scaled properly.
Acquire: When this button is pressed, the microcontroller will begin collecting conversions from the
ADC and sending them to the PC. The PC stores the
conversions as a small sample set. From the sample
set collected, the high, the low, peak-to-peak, average, and standard deviation, are computed (the size
of the data set is set by the “Num To Average” box)
and then the display icons are updated. The most recent conversion will be displayed in the Last Conversion box in hexadecimal format. This process
continues until the STOP button is pressed, or until
another window is selected.
Num To Average: Input icon that sets the size of
the data conversion set referred to when the Acquire button is pressed.
OF and OD: These two icons represent the OF and
OD flags that are part of the ADC’s output word. If
one or both of these flags are set, the appropriate
icon will light up.
Software Calibration Features: Because the
CS5510/11/12/13 have no built-in calibration features, any calibration functionality must be implemented in software. The following functions, found
in the Software Calibration Box, allow the user to
perform software-based calibrations on the ADCs.
7
CDB5510/11/12/13
Offset Cal - This button allows the user to perform
a software offset calibration. To do so, the user
should connect analog inputs AIN+ and AIN- to a
zero point, and press the Offset Cal Button. The microcontroller will then obtain a number of conversions from the ADC (dictated by the Cals to Avg.
Box) and average these conversions together. The
result will be stored in memory and displayed in the
Offset Box.
Gain Cal - This button allows the user to perform a
software gain calibration. To do this, the user
should connect the analog inputs AIN+ and AIN- to
a full-scale value (at least 10% less than the maximum full scale of the part, to maintain accuracy)
and press the Gain Cal Button. The microcontroller
will then obtain a number of conversions from the
ADC (dictated by the Cals to Avg. Box), subtract
out the contents of the Offset Box, and average the
results together. From this, a gain factor is computed, stored in memory, and displayed in the Gain
Factor Box.
Multiply Gain - The Multiply Gain (2x and 1/2)
Buttons allow the user to easily divide or multiply
the gain factor by 2. This feature can be used to digitally scale the output of the part in software by factors of two.
Cal On/Cal Off - This switch allows the user to apply the calibration values to the data collected in
the Setup Window. When the switch is in the Off
position, the collected results will reflect the raw
conversion data from the ADC. When the switch is
in the On position, the value in the Offset Box will
be subtracted from the conversions, and the result
will be multiplied by the value in the Gain Factor
Box. The collected results will reflect the value after the calibration data has been applied.
2.3 Data Collection Window Overview
The Data Collection Window is used to collect and
analyze data sets using the evaluation board. The
software supports Time Domain, Frequency Domain (FFT) and Histogram analysis of collected
8
data sets. To go to the Data Collection Window,
pull down the Window menu item and select “Data
Collection Window”, or press F2 on the keyboard.
The following controls and indicators are present in
the Data Collection Window regardless of what test
is being performed.
COLLECT: Initiates the data conversion collection process. COLLECT has two modes of operation: collect from file or collect from converter. To
collect from a file, a previously saved file from the
ComPorts->DISK menu bar option must be selected. Once a file is selected, its content will displayed
on the graph when the COLLECT button is
pressed. If the user is collecting conversions from
the evaluation board to analyze, the appropriate
COM port must be selected. The user is then free to
collect the preset number of conversions (preset by
the CONFIG pop-up menu discussed below). Notice, there is a significant acquisition time difference between collecting from a file and collecting
from the evaluation board. Data can only be collected from the evaluation board at the converter’s
current sampling frequency, and will take much
longer than retrieving previously collected data
from a file.
CANCEL: This button allows the user to exit from
the COLLECT algorithm during a collection. It is
recommended that the user reset the evaluation
board after pressing this button, so that the evaluation board will stop collecting data and wait for the
next command.
OUTPUT: This button calls up a pop-up window
which allows the user to save the collected data set
to a file or print out the information on the screen.
Two printing options are available: printing only
the plot data, and printing the entire screen including the calculated statistics for the current analysis
mode.
ZOOM: Pressing this button allows the user to
zoom in on a specific portion of the current graph.
To zoom, click on the ZOOM icon, then click on the
DS337DB2
CDB5510/11/12/13
graph to select one corner of the desired Zoom area.
When prompted, click on the graph again to select
the opposite corner of the desired zoom area. Once
an area has been zoomed to, the printing functions
can be used to print a hard copy of that region. Click
on RESTORE when done with the zoom function to
display the entire data set graph. A region can also be
magnified further by clicking on the ZOOM button
again.
oped at Cirrus Logic. If information concerning
these algorithms is needed, call technical support.
AVERAGE: Sets the number of consecutive FFT’s
to perform and average.
LIMITED NOISE BANDWIDTH: Limits the
amount of noise in the converters bandwidth. Default is 0 Hz.
OK: Accept the changes and close the window
RESTORE: Restores the display of the graph after
zoom has been entered. No matter how far in the
user has magnified the data plot, the RESTORE
button will return to the fully zoomed-out data plot.
2.3.1 Histogram Plots
TIME DOMAIN / FFT / HISTOGRAM Selector:
This pull-down menu selects between time domain,
frequency domain, and histogram mode to perform
and display the appropriate analysis of the data set.
BIN: Displays the x-axis value of the cursor on the
Histogram. This represents the output code from the
part.
Cal On/Cal Off: This switch allows the user to apply the calibration values to the data set as it is collected. When the switch is in the Off position, the
collected results will reflect the raw conversion
data from the ADC. When the switch is in the On
position, the calibration values from the Setup
Window will be applied to the data as it is collected. This switch must be set to the desired value before data is collected, since the calibration values
can only be applied during the collection process.
CONFIG: Opens a pop-up panel (Figure 4) to configure how much data is to be collected, and how to
process the data once it is collected. The following
are controls and indicators associated with the
CONFIG panel.
SAMPLES: Allows the user to select the number of
conversions to collect, between 16 and 32,768.
WINDOW: Used in the Power Spectrum Window
to calculate the FFT. Windowing algorithms include the Blackman, Blackman-Harris, Hanning,
5-term Hodie, and 7-term Hodie. The 5-term Hodie
and 7-term Hodie are windowing algorithms devel-
DS337DB2
The following is a description of the indicators associated with Histogram analysis (Figure 6).
MAGNITUDE: Displays the y-axis value of the
cursor on the Histogram. This represents the number of times a certain output code occurred in the
collected data set.
MAXIMUM: Indicator for the maximum value of
the collected data set.
MEAN: Indicator for the mean (average) of the data
sample set.
MINIMUM: Indicator for the minimum value of
the collected data set.
STD. DEV.: Indicator for the Standard Deviation
of the collected data set.
VARIANCE: Indicates the Variance for the current data set.
2.3.2 Frequency Domain (FFT) Plots
The following describe the indicators associated
with Frequency Domain (FFT) analysis (Figure 3).
FREQUENCY: Displays the x-axis value of the
cursor on the FFT display. This represents the center frequency of the currently selected bin in Hz.
MAGNITUDE: Displays the y-axis value of the
cursor on the FFT display. This represents the total
power in dB contained in the selected bin.
9
CDB5510/11/12/13
S/D: Indicator for the Signal-to-Distortion Ratio, in
dB. This is the ratio of the signal magnitude to the
magnitude of the first four harmonics.
S/N+D: Indicator for the Signal-to-Noise + Distortion Ratio in dB. This is the ratio of the signal magnitude to the magnitude of the first four harmonics
and the noise.
SNR: Indicator for the Signal-to-Noise Ratio in
dB. This is the ratio of the signal magnitude to the
magnitude of the noise (an average noise value is
included in place of the first four harmonics).
S/PN: Indicator for the Signal-to-Peak Noise Ratio
in dB. This is the ratio of the signal magnitude to
the magnitude of the highest noise component not
included in the harmonics of the signal.
2.3.3 Time Domain Plots
The following indicators are associated with Time
Domain analysis (Figure 5).
COUNT: Displays current x-position of the cursor
on the time domain display. This represents the position of the code within the collected sample set.
MAGNITUDE: Displays current y-position of the
cursor on the time domain display. This represents
the actual code from the converter.
MAXIMUM: Indicator for the maximum value of
the collected data set.
MINIMUM: Indicator for the minimum value of
the collected data set.
# of AVG: Displays the number of FFT’s averaged
in the current display.
Figure 1. Title Screen
10
DS337DB2
CDB5510/11/12/13
Figure 2. Setup Window
DS337DB2
11
CDB5510/11/12/13
Figure 3. Frequency Domain Analysis
Figure 4. Configuration Panel
12
DS337DB2
CDB5510/11/12/13
Figure 5. Time Domain Analysis
Figure 6. Histogram Analysis
DS337DB2
13
3. SCHEMATICS
14
V+ POST
V- POST
V+
J6
J7
R24
10
VD+
Z1
C4
C20
P6KE6V8P
VZ2
47UF
C14
P6KE6V8P
47UF
.1UF
C5
AGND
Note: (V+) - (V-) must be 5V for proper operation of the
ADC. Also, (V+) - (GND) must be at least 3V for the
digital portion of the board to operate.
.1UF
AGND
GND POST
J5
1) V+ = 5V, V- = 0V, GND = 0V
2) V+ = 3V, V- = -2V, GND = 0V
AGND
DS337DB2
Figure 7. CDB5510 Power Supply Schematic
CDB5510/11/12/13
Some Valid Power Supply Options:
DS337DB2
HDR6
R23
10
U4
V+
6
IN
OUT
TRIM
HTR
TEMP
GND
C19
.1UF
2
4
6
R12
10K
LT1019CN8_2P5
2
1
3
5
/CS
SDO
SCLK
5
7
3
AGND
R11
10K
4
VC22
C21
VHDR3
V+
VREF J1
1
2
V-
R1
301
1
3
5
U6
VHDR4
R4
AIN+ J3
AIN-
.1UF
.1UF
2
4
6
301
1
AMPOUT+
V-
1
3
5
C9
2
4
6
/CS
4700PF
8
7
6
5
SDO
V+
SCLK
CS5510-AS
AGND
HDR5
1
3
5
.68UF
2
4
6
Figure 8. CDB5510 Reference and ADC Schematic
15
CDB5510/11/12/13
AMPOUTV-
SDO
VV+
SCLK
C10
2
301
VREF
AIN+
AIN/CS
.68UF
C25
R5
1
2
3
4
16
AGND
C29
.1UF
V-
V- 4
+
3
AMPOUT+
1
2
V+
R3
AMPIN+
AMPIN-
J2
R17
U1
C7
4.02K
8
301
1800PF
COG
V+
C28
1
C24
R6
2
.1UF
402
4700PF
COG
R2
R9
R8
10M
10M
AGND
301
HDR2
1
2
4
3
C8
4.02K
1800PF
COG
U1
6
-
7
AMPOUT-
5
+
DS337DB2
Figure 9. CDB5510 Amplifier Schematic (not populated)
CDB5510/11/12/13
R18
AGND
V-
DS337DB2
VD+
R7
D2
1N4148
750K
VD+
C16
S1
SW_B3W_1100
47UF
.1UF
D1
VD+
/CS
SDO
200
200
1
2
3
4
5
6
7
8
HDR1
9
2
4
10
11
12
13
14
R20
200
15
16
17
33PF
18
COG
19
33PF
3.6864MHZ
Y1
C1
20
39
8
1
7
2
6
3
5
4
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
AT90S8515
AGND
P2_7
P2_6
P2_5
P2_4
P2_3
P2_2
P2_1
P2_0
LED_555_5003
SW_DIP_3
1
2
3
SW1
AGND
R14
R15
R16
C2
VCC
(AD0)PA_0
(AD1)PA_1
(AD2)PA_2
(AD3)PA_3
(AD4)PA_4
(AD5)PA_5
(AD6)PA_6
(AD7)PA_7
ICP
ALE
OC1B
(A15)PC_7
(A14)PC_6
(A13)PC_5
(A12)PC_4
(A11)PC_3
(A10)PC_2
(A9)PC_1
(A8)PC_0
AGND
OPEN
SCLK
PB0(T0)
PB1(T1)
PB2(AIN0)
PB3(AIN1)
PB4(/SS)
PB5(MOSI)
PB6(MISO)
PB7(SCK)
/RESET
PD0(RXD)
PD1(TXD)
PD2(INT0)
PD3(INT1)
PD4
PD5(OC1A)
PD6(/WR)
PD7(/RD)
XTAL2
XTAL1
GND
40
5.11K
5.11K
5.11K
R22
R21
AGND
RS232RX
RS232TX
C15
U5
.1UF
AGND
1
3
C3
COG
AGND
Figure 10. CDB5510 Microcontroller Schematic
17
CDB5510/11/12/13
AGND
18
VD+
C23
C17
C11
.1UF
.1UF
TANT
U2
U3
.1UF
5
1
1
2
3
4
5
6
AGND
VCC
2
AGND
3
4
HDR7
1
C18
2
SCLK
GND
7
8
.1UF
NC7SZU04M5
C12
VCC
C1+
V+
GND
C1T1OUT
C2+
R1IN
C2R1OUT
VT1IN
T2OUT
T2IN
R2IN
R2OUT
MAX3232CPE
AGND
R10
VD+
16
15
14
13
12
11
C13
.1UF
TANT
10
9
AGND
AGND
.1UF
TANT
10M
AGND
R19
49.9K
J4
1
6
2
26
Y2
32.768KHZ
2PF
OG
7
3
8
4
9
5
C6
R13
47PF
COG
VD+
10K
DE9F_RA
RS232RX
RS232TX
AGND
DS337DB2
Figure 11. CDB5510 RS232 and Oscillator Schematic
CDB5510/11/12/13
AGND
DS337DB2
19
CDB5510/11/12/13
Figure 12. CDB5510 Silkscreen Layout
CDB5510/11/12/13
Figure 13. CDB5510 Top Side Layout
20
DS337DB2
CDB5510/11/12/13
Figure 14. CDB5510 Bottom Side Layout
DS337DB2
21
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