CDB5378 Datasheet, PDF (3/72 Pages) Cirrus Logic – Single-channel Seismic Evaluation System

CDB5378
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
DS639DB3
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