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AIN1+

AIN1-

AIN2+

AIN2-

CRYSTAL

4.9152 MHz

CS5534

SCLK

SDO

SDI

C8051F320

Microcontroller

RESET

CIRCUITRY

Interface Header

AIN1+

AIN1-

AIN2+

AIN2-

AIN3+

AIN3-

AIN3+

AIN3-

AIN4+

AIN4-

AIN4+

AIN4-

VREF-

VREF+

VREF

Source

Select

LT1019

VREF+

VREF-

VD+

VA- VA+

GND

+5 V

USB

CONNECTOR

CDB5534U

CDB5534U Evaluation Board and Software

Features

z USB Communication with PC

z On-board Microcontroller

z On-board Voltage Reference

z Evaluation Software

– Register Setup & Chip Control

– FFT Analysis

– Time Domain Analysis

– Noise Histogram Analysis

z Interface Header for External Microcontroller

General Description

The CDB5534U is an inexpensive tool designed to eval-

uate the functionality and performance of the CS5534.

The CS5534 datasheet should be read and consulted

when using the CDB5534U evaluation board.

The evaluation board includes a C8051F320 microcon-

troller with a USB interface. The microcontroller controls

the serial communication between the evaluation board

and the PC via the firmware, enabling quick and easy ac-

cess to all of the CS5534’s registers and functions.

The CDB5534U includes software for Data Capture,

Time Domain Analysis, Histogram Analysis, and Fre-

quency Domain Analysis.

ORDERING INFORMATION

CDB5534U Evaluation Board

NOV ‘06

DS289DB6

Summary of content (22 pages)

PAGE 1
CDB5534U CDB5534U Evaluation Board and Software Features General Description z USB Communication with PC The CDB5534U is an inexpensive tool designed to evaluate the functionality and performance of the CS5534. The CS5534 datasheet should be read and consulted when using the CDB5534U evaluation board. z On-board Microcontroller z On-board Voltage Reference z Evaluation Software The evaluation board includes a C8051F320 microcontroller with a USB interface.
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CDB5534U TABLE OF CONTENTS 1. HARDWARE ............................................................................................................................. 3 1.1 Introduction ........................................................................................................................ 3 1.2 Evaluation Board Overview ................................................................................................ 3 1.2.1 Analog Section .......................................................
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CDB5534U 1. HARDWARE 1.1 Introduction The CDB5534U evaluation board provides a quick means of evaluating the CS5534 Analog-to-Digital Converter (ADC). The CS5534 is a highly integrated ∆Σ ADC which uses charge-balance techniques to achieve 24-bit performance. The CS5534 includes a very low noise chopper-stabilized instrumentation amplifier (6 nV/sqrt(Hz) @ 0.1 Hz) with selectable gains of 1×, 2×, 4×, 8×, 16×, 32×, and 64×.
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CDB5534U Table 1. Voltage Reference Selection for VREF+ Reference Description J17 VA+ Selects Positive Analog Power Supply VA+ O LT1019 O REF+ O O VREF+ O VREF+ O VREF+ LT1019 Selects on-Board LT1019 Reference (5ppm/°C) VA+ O LT1019 O REF+ O O VREF+ O VREF+ O VREF+ VREF+ Selects External VA+ O O VREF+ Reference Source LT1019 O O VREF+ REF+ O O VREF+ (J12) Table 2. Voltage Reference Selection for VREF- 1.2.
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CDB5534U the +5 V binding post (J3), or the regulated +3.3 V supply derived from the microcontroller. The +5 V binding post supplies the microcontrollers internal regulator.
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Figure 1.
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Figure 2.
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Figure 3.
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CDB5534U 2. SOFTWARE The evaluation board comes with software and a USB cable to link the evaluation board to the PC. The software is designed to run under Windows® 2000 or later. 2.1 2.1.1 Installation Procedure CDB5530U GUI Software Installation Instructions 1. Ensure the CDB5534U USB cable is disconnected from the PC. 2. Open GUI software installation folder CDB553x_cvidistkit.Eval5534U Ö Volume1. 3. Run SETUP.EXE by double clicking on the filename. 4.
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CDB5534U 2.2.1 Start-Up Window When the evaluation program is launched, the Start-Up window will appear. This window contains information concerning the software’s title, revision number, copyright date, etc. Figure 4. CDB5534U Start-Up Screen At the top of the screen is a menu bar which displays user options. The menu bar item Window is initially disabled to prevent conflicts with other serial communications devices.
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CDB5534U 2.2.1.2 Window After the user selects the appropriate setup, the Window option becomes available in the Start-Up window. The Window pull-down has three options: Start-Up Window, Setup Window, and Data Collection Window. 2.2.2 Setup Window The Setup Window allows the user to access the internal registers of the CS5534. See Figure 5. Figure 5. CDB5534U Setup Window In the Setup Window, all of the ADC’s registers are displayed as hexadecimal values.
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CDB5534U are displayed in the “Last Conversion” box, as well as the Channel and Overflow indicator bits for each conversion. The software will halt the data collection process when the user selects the Stop button. Configuration Register: In the Configuration Register box, the contents of the Configuration Register are displayed, and can be modified by typing a hexadecimal value in the Hexadecimal: box, or by changing any of the values below the Hexadecimal: box to the desired settings.
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CDB5534U Window for more details). Note that offset calibration should be performed before gain calibration to ensure accurate results. Refer to the CS5534 datasheet for more details. Figure 7. CDB5534U Calibration Window Self Offset or Gain Calibrations: 1) Pull down the Self Offset or Self Gain box, and select the setup number you want to use to calibrate the channel. 2) The offset and gain register values will automatically update when the calibration is completed.
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CDB5534U 2.2.3 Data Collection Window The Data Collection Window (Figure 8) allows the user to collect sample sets of data from the CS5534 and analyze them using time domain, FFT, and histogram plots. The Data Collection Window is accessible through the Window option, or by pressing F3. Figure 8. CDB5534U Data Collection Window Time Domain / FFT / Histogram Selector: This menu selects the type of data processing to perform on the collected data and display in the plot area.
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CDB5534U 2.2.4 Configuration Window The Configuration Window allows the user to set up the data collection and analysis parameters. See Figure 9. Figure 9. CDB5534U Configuration Window Number of Samples: This box allows the user to select the number of samples to collect, between 16 and 32,768. Average: When doing FFT processing, this box will determine the number of FFTs to average. FFTs will be collected and averaged when the Collect button is pressed.
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CDB5534U 2.3 Collecting Data Sets To collect a sample data set: 1) In the Data Collection Window, select the Config button to bring up the Configuration Window and view the current settings. 2) Select the appropriate settings from the available options (see the section on the Configuration Window) and select the Accept button. 3) The Data Collection Window should still be visible. In the Setup box, select the Setup number you want to use to perform conversions.
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CDB5534U 2.7 Histogram Information The following is a description of the indicators associated with Histogram Analysis. Histograms can be plotted in the Data Collection Window by setting the Time Domain / FFT / Histogram selector to Histogram. BIN: Displays the x-axis value of the cursor on the Histogram. MAGNITUDE: Displays the y-axis value of the cursor on the Histogram. MAXIMUM: Indicator for the maximum value of the collected data set. MEAN: Indicator for the average of the data sample set.
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CDB5534U Figure 10. Top Silkscreen 3.
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Figure 11.
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Figure 12.
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Figure 13.
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CDB5534U 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 IMPORTANT NOTICE Cirrus Logic, Inc. and its subsidiaries ("Cirrus") believe 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).