1 A/D Converter Power Supply, Analog Supply Circuit | Digi RCM4000

4.4.1 A/D Converter Power Supply

The analog section is isolated from digital noise generated by other components by way of a low-pass filter composed of C1, L1, and C3 on the RCM4000 as shown in Figure 13. The +V analog power supply powers the A/D converter chip.

+3.3 V	+V
L1
C1	C3
2.2 nF	100 nF

Figure 13. Analog Supply Circuit

User’s Manual

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Digi RCM4000 user manual 1 A/D Converter Power Supply, Analog Supply Circuit

Contents

RabbitCore RCM4000 Rabbit Semiconductor Trademarks Table of Contents Software Reference Appendix C. Power Supply 109 RabbitCore RCM4100 Introduction RCM4000 Features RCM4000 FeaturesFeature RCM4000 RCM4010 Advantages of the RCM4000 1 RCM4000 Development Kit Development and Evaluation Tools Online Documentation Software RabbitCore RCM4000 Getting Started Install Dynamic C Prepare the Prototyping Board for Development Hardware Connections Prototyping Board Attach Module to Prototyping Board Connect Programming Cable AC Adapter Connect Power Run a Sample Program TroubleshootingRun a Sample Program Technical Support Where Do I Go From Here? RabbitCore RCM4000 Introduction Running Sample Programs Sample Programs User’s Manual Use of Nand Flash RCM4000 only Click OK or Close to exit the various dialog boxes Serial Communication User’s Manual Real-Time Clock 3 A/D Converter Inputs RCM4000 only RabbitCore Module Hardware Reference Shows the RCM4000 pinouts for header J3 RCM4000 Digital Inputs and Outputs 4000 Pin Pin Name Default Use Alternate Use RCM4000 Pinout Configurations TXD PC0 PE1 Other Inputs and Outputs Memory I/O Interface Serial Communication Rabbit 4000 Serial Port and Clock PinsSerial Ports RJ-45 Ethernet Port Pinout Ethernet Port Programming Port Programming Cable Changing Between Program Mode and Run Mode Standalone Operation of the RCM4000 Resistor Divider Network for Analog Inputs A/D Converter RCM4000 only It is not referenced to Analog Supply Circuit 1 A/D Converter Power Supply Clock Doubler Other HardwareSpectrum Spreader Nand Flash MemorySram Flash Eprom RabbitCore RCM4000 More About Dynamic C Software Reference RabbitCore RCM4000 Sram Use Dynamic C Function CallsDigital I/O Serial Communication Drivers RabbitCore RCM4000 Board Initialization Prototyping Board Functions Alerts Void timedAlertunsigned long timeout Analog Inputs RCM4000 only ADS7870 Signal ADS7870 State RCM3400 Function/State On write operations Data value on read operations Gain Code Multiplier Unsigned int anaInDriverunsigned int cmd, unsigned int len AnaInConfig, anaIn, brdInit Gain Code Multiplier Voltage Range Single Diff ×10 ×16 ×20 126 Applies to Prototyping Board If successful If not able to make calibration constants Channel Code Single-Ended Voltage Range † Input Lines Float anaInVoltsunsigned int channel, unsigned int gaincode Float anaInDiffunsigned int channel, unsigned int gaincode Channel Code 20 mA Input Lines Float anaInmAmpsunsigned int channel Allchan Gain Code Voltage Range +AIN7 AIN6 Gain Code Voltage Range Add-On Modules Upgrading Dynamic C RabbitCore RCM4000 TCP/IP Connections Using the TCP/IP Features RabbitCore RCM4000 TCP/IP Primer on IP Addresses Typical Corporate Network IP Addresses Explained How IP Addresses are Used Dynamically Assigned Internet Addresses Placing Your Device on the Network Running TCP/IP Sample Programs Direct Connection Using a HubDirect Connection How to Set IP Addresses in the Sample Programs Direct Connection PC to RCM4000 Module How to Set Up your Computer for Direct Connect Running Additional Sample Programs With Direct Connect Run the PINGME.C Sample Program Where Do I Go From Here? RabbitCore RCM4000 Appendix A. RCM4000 Specifications Dia × Electrical and Mechanical Characteristics Exclusion Zone Parameter RCM4000 RCM4010 Table A-1. RCM4000 Specifications Ten 8-bit timers 6 cascadable from the first 1 A/D Converter Table A-2 Converter SpecificationsParameter Test Conditions Figure A-3. User Board Footprint for RCM4000 Headers Symbol Parameter Min Typ Max Rabbit 4000 DC CharacteristicsTable A-4 .3 Volt DC Characteristics Symbol Parameter Maximum Rating Table A-6. External Capacitive Bus Loading -40C to +85C I/O Buffer Sourcing and Sinking LimitBus Loading Table A-5. Capacitance of Rabbit 4000 I/O Ports Iord Clock to Address Worst-Case Table A-8. Preliminary Data and Clock DelaysOutput Delay 30 pF 60 pF 90 pF Ns setting No dbl / dbl Conformally coated Area Conformal Coating Table A-9. RCM4000 Jumper Configurations Jumper ConfigurationsHeader Description Pins Connected Factory Default RabbitCore RCM4000 Appendix B. Prototyping Board Current Measurement Headers RCM4000 Prototyping Board Features RabbitCore RCM4000 935 Mechanical Dimensions and Layout Table B-1. Prototyping Board Specifications Power SupplyParameter Specification Signals Using the Prototyping Board Pin Pin Name Prototyping Board Use Measuring Current Draw Adding Other Components Table B-3. Positive A/D Converter Input Voltage Ranges Analog Features RCM4000 only3.1 A/D Converter Inputs Table B-4. Differential Voltage Ranges Thermistor Input Mode Read Calibrate3.3 A/D Converter Calibration Serial Port Header Default Use Alternate Use Table B-5. Prototyping Board Serial Port Configurations 4.1 RS-232 Table B-6. RCM3400 Prototyping Board Jumper Configurations Prototyping Board Jumper Configurations JP5 LN4IN-LN6IN 108 Power Supplies Appendix C. Power SupplyBattery-Backup Circuits 165 mA·h = 2.5 years Reset Generator User’s Manual 111 112 SMODE0 SMODE1 Index ADCALALL.C User’s Manual 115 116 Schematics