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PDF CDB5550 Data sheet ( Hoja de datos )
| Número de pieza | CDB5550 | |
| Descripción | Evaluation Board and Software | |
| Fabricantes | Cirrus Logic | |
| Logotipo |  |
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CDB5550
CDB5550 Evaluation Board and Software
Features
General Description
USB Communication with PC
On-board Microcontroller
Multiple Voltage Reference Options
- On-chip Reference
- External Reference with On-Board Precision
Dividers
LabWindows/CVITM Evaluation Software
- Register Setup & Chip Control
- FFT Analysis
- Time Domain Analysis
- Noise Histogram Analysis
Interface Header for External Microcontroller
Supports 3.3 V and 5.0 V Digital Operation of
the CS5550
The CDB5550 is an excellent means for quickly evaluat-
ing the functionality and performance of the CS5550 A/D
converter. The CS5550 datasheet is supplied in con-
junction with the CDB5550 evaluation board.
The evaluation board includes a C8051F320 microcon-
troller, a USB interface, drivers, and firmware. The
microcontroller controls the serial communication be-
tween the evaluation board and the PC via the firmware,
enabling quick and easy access to all of the CS5550’s
registers and functions.
The CDB5550 includes software for Data Capture, Time
Domain Analysis, Histogram Analysis, and Frequency
Domain Analysis.
ORDERING INFORMATION
CDB5550
Evaluation Board
AIN1+ AIN1+
AIN1- AIN1-
AIN2+
AIN2+
AIN2-
AIN2-
Ext
Ref
Ext Gnd
Ref
Gnd
CRYSTAL
4.09C6RMYSHTzAL
4.096 MHz
CSC5S5555050
AINA1I+N1+
CSCS
AINA1I-N1- SDSIDI
SDO
SDSCOLK
AIN2+
AIN2+
SCLKINT
RIENSTET
A IN2R- ESET
AIN2-
VREF
OUT IN
Selectable
Divider
VREF
OUT IN
Selectable
Divider
Interface Header
Interface Header
+5 V
+5 V
GND
GND
RESETRESET
CIRCUICTIRRYCUITRY
C8051F320
MicrocCo8n0tr5ol1leFr320
Microcontroller
USB
CONNECTOR
USB
CONNECTOR
Cirrus Logic, Inc.
http://www.cirrus.com
©Copyright Cirrus Logic, Inc. 2004
(All Rights Reserved)
JUN ‘04
DS630DB1
1
1 page  
CDB5550
The CDB5550 also provides options for sourcing the voltage reference for the CS5550. These options
include the on-chip reference (VREFOUT), or an external reference. The voltage reference selection is
controlled via the header J7. Refer to Table 2.
Reference
Description
J7
Ext VREF
Selects the external voltage reference
(J4)
O O VREFOUT
O O Ext VREF
CS5550 VREFOUT
Selects the internal voltage reference
from the CS5550
O O VREFOUT
O O Ext VREF
Table 2. VREFIN Source Selection
A selectable voltage divider for the external reference is also provided. The external voltage applied to the
terminal block J4 can be divided by a factor of 1, 2, 4, or 8. The voltage divider is controlled by header J1.
Refer to Table 3.
Reference
Description
J7
/1
Divides the external voltage applied to J4
by a factor of 1
O O /1
O O /2
O O /4
O O /8
/2
Divides the external voltage applied to J4
by a factor of 2
O O /1
O O /2
O O /4
O O /8
/4
Divides the external voltage applied to J4
by a factor of 4
O O /1
O O /2
O O /4
O O /8
/8
Divides the external voltage applied to J4
by a factor of 8
O O /1
O O /2
O O /4
O O /8
Table 3. External Voltage Divider Selection
1.2.2 Digital Section
The digital section of the CDB5550 consists of the microcontroller, interface header, reset circuitry, and
the USB interface. The microcontroller handles the communication between the PC and the CS5550. This
device is pre-programmed and requires no additional code in order to operate.
An SPI interface header is provided via J8 for use with an external microcontroller. However, if an external
microcontroller is used, the on-board microcontroller (U3) must be disconnected from the SPI port. This
can be accomplished by removing the 0 ohm resistors R11, R12, R13, R15, R17, and R18.
The CDB5550 has a pushbutton reset switch, S1. This reset button will reset the microcontroller which
will then reset the CS5550, resetting all registers to their default values.
5
5 Page 
CDB5550
2.2.5 Data Collection Window
The Data Collection Window allows the user to collect sample sets of data from the CS5550 and analyze
them using time domain, FFT, and histogram plots. The user can then output this data to a file or make a
hardcopy of the display.
Figure 7. CDB5550 Data Collection Window
2.2.5.1. 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.
Refer to the section on Analyzing Data for more information.
11
11 Page | ||
| Páginas | Total 23 Páginas | |
| PDF Descargar | [ Datasheet CDB5550.PDF ] | |
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