CDB5378 datasheet(3/72 Pages) CIRRUS

3 / 72 page

CDB5378

DS639DB3

TABLE OF CONTENTS

1. INITIAL SETUP ......................................................................................................................... 5

1.1 Kit Contents ....................................................................................................................... 5

1.2 Hardware Setup ................................................................................................................. 5

1.2.1 Default Jumper Settings

..................................................................................... 6

1.2.2 Default DIP Switch Settings ................................................................................. 8

1.3 Software Setup .................................................................................................................. 9

1.3.1 PC Requirements .................................................................................................. 9

1.3.2 Seismic Evaluation Software Installation .............................................................. 9

1.3.3 USBXpress Driver Installation ............................................................................... 9

1.3.4 Launching the Seismic Evaluation Software ....................................................... 10

1.4 Self-testing CDB5378 ...................................................................................................... 11

1.4.1 Noise test ............................................................................................................ 11

1.4.2 Distortion Test ..................................................................................................... 12

2. HARDWARE DESCRIPTION ................................................................................................. 13

2.1 Block Diagram ................................................................................................................ 13

2.2 Analog Hardware ............................................................................................................. 14

2.2.1 Analog Inputs ...................................................................................................... 14

2.2.2 Differential Amplifiers .......................................................................................... 17

2.2.3 Delta-Sigma Modulator ....................................................................................... 18

2.2.4 Delta-Sigma Test DAC ........................................................................................ 19

2.2.5 Voltage Reference .............................................................................................. 20

2.3 Digital Hardware .............................................................................................................. 20

2.3.1 Digital Filter ......................................................................................................... 20

2.3.2 Interface CPLD ................................................................................................... 23

2.3.3 Digital Control Signals ......................................................................................... 25

2.3.4 Microcontroller .................................................................................................... 25

2.3.5 RS-485 Telemetry ............................................................................................... 27

2.3.6 UART Connection ............................................................................................... 29

2.3.7 External Connector ............................................................................................. 30

2.4 Power Supplies ................................................................................................................ 30

2.4.1 Analog Voltage Regulators ................................................................................. 30

2.4.2 Digital Voltage Regulators .................................................................................. 31

2.5 PCB Layout ..................................................................................................................... 32

2.5.1 Layer Stack ......................................................................................................... 32

2.5.2 Differential Pairs .................................................................................................. 32

2.5.3 Bypass Capacitors .............................................................................................. 33

2.5.4 Dual-row Headers ............................................................................................... 34

3. SOFTWARE DESCRIPTION .................................................................................................. 35

3.1 Menu Bar ......................................................................................................................... 35

3.2 About Panel ..................................................................................................................... 36

3.3 Setup Panel ..................................................................................................................... 37

3.3.1 USB Port ............................................................................................................. 38

3.3.2 Digital Filter ......................................................................................................... 39

3.3.3 Analog Front End ................................................................................................ 40

3.3.4 Test Bit Stream ................................................................................................... 41

3.3.5 Gain / Offset ........................................................................................................ 42

3.3.6 Data Capture ....................................................................................................... 43

3.3.7 External Macros .................................................................................................. 44

3.4 Analysis Panel ................................................................................................................. 45

3.4.1 Test Select .......................................................................................................... 46

3.4.2 Statistics .............................................................................................................. 47

3.4.3 Plot Enable .......................................................................................................... 47

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