1 A/D Converter, Table A-2 Converter Specifications | Digi RCM4000

A.1.1 A/D Converter

Table A-2shows some of the important A/D converter specifications. For more details, refer to the ADC7870 data sheet.

Table A-2.		A/D Converter Specifications

Parameter		Test Conditions	Typ	Max

Analog Input Characteristics
Input Capacitance			4 – 9.7 pF
Input Impedance
Common-Mode			6 MΩ
Differential Mode			7 MΩ

Static Accuracy
Resolution
Single-Ended Mode			11 bits
Differential Mode			12 bits
Integral Linearity			±1 LSB	±2.5 LSB
Differential Linearity			±0.5 LSB

Dynamic Characteristics
Throughput Rate			52 ksamples/s

Voltage Reference
Accuracy		Vref = 2.048 V and 2.5 V	±0.05%	±0.25%
Buffer Amp Source Current			20 µA
Buffer Amp Sink Current			20 mA
Short-Circuit Current			20 mA

82	RabbitCore RCM4000

Image 88

Digi RCM4000 user manual 1 A/D Converter, Table A-2 Converter Specifications, Parameter Test Conditions

Contents

RabbitCore RCM4000 Trademarks Rabbit Semiconductor Table of Contents Software Reference Appendix C. Power Supply 109 RabbitCore RCM4100 Introduction RCM4000 Features RCM4000 FeaturesFeature RCM4000 RCM4010 Advantages of the RCM4000 Development and Evaluation Tools 1 RCM4000 Development Kit Software Online Documentation RabbitCore RCM4000 Install Dynamic C Getting Started Hardware Connections Prepare the Prototyping Board for Development Attach Module to Prototyping Board Prototyping Board AC Adapter Connect Programming Cable Connect Power Run a Sample Program TroubleshootingRun a Sample Program Where Do I Go From Here? Technical Support RabbitCore RCM4000 Running Sample Programs Introduction 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 3 A/D Converter Inputs RCM4000 only Real-Time Clock Hardware Reference RabbitCore Module RCM4000 Digital Inputs and Outputs Shows the RCM4000 pinouts for header J3 4000 RCM4000 Pinout Configurations Pin Pin Name Default Use Alternate Use TXD PC0 PE1 Memory I/O Interface Other Inputs and Outputs Serial Communication Rabbit 4000 Serial Port and Clock PinsSerial Ports Ethernet Port RJ-45 Ethernet Port Pinout Programming Port Changing Between Program Mode and Run Mode Programming Cable Standalone Operation of the RCM4000 A/D Converter RCM4000 only Resistor Divider Network for Analog Inputs It is not referenced to 1 A/D Converter Power Supply Analog Supply Circuit Clock Doubler Other HardwareSpectrum Spreader Memory SramFlash Eprom Nand Flash RabbitCore RCM4000 Software Reference More About Dynamic C RabbitCore RCM4000 Dynamic C Function Calls Digital I/OSerial Communication Drivers Sram Use RabbitCore RCM4000 Prototyping Board Functions Board Initialization Void timedAlertunsigned long timeout Alerts ADS7870 Signal ADS7870 State RCM3400 Function/State Analog Inputs RCM4000 only On write operations Data value on read operations Unsigned int anaInDriverunsigned int cmd, unsigned int len Gain Code Multiplier AnaInConfig, anaIn, brdInit Single Diff Gain Code Multiplier Voltage Range ×10 ×16 ×20 126 Applies to Prototyping Board If successful If not able to make calibration constants Float anaInVoltsunsigned int channel, unsigned int gaincode Channel Code Single-Ended Voltage Range † Input Lines Float anaInDiffunsigned int channel, unsigned int gaincode Float anaInmAmpsunsigned int channel Channel Code 20 mA Input Lines Allchan Gain Code Voltage Range +AIN7 AIN6 Gain Code Voltage Range Upgrading Dynamic C Add-On Modules RabbitCore RCM4000 Using the TCP/IP Features TCP/IP Connections 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 How to Set Up your Computer for Direct Connect Direct Connection PC to RCM4000 Module Run the PINGME.C Sample Program Running Additional Sample Programs With Direct Connect Where Do I Go From Here? RabbitCore RCM4000 Appendix A. RCM4000 Specifications Electrical and Mechanical Characteristics Dia × Exclusion Zone Table A-1. RCM4000 Specifications Parameter RCM4000 RCM4010 Ten 8-bit timers 6 cascadable from the first 1 A/D Converter Table A-2 Converter SpecificationsParameter Test Conditions Headers Figure A-3. User Board Footprint for RCM4000 Rabbit 4000 DC Characteristics Table A-4 .3 Volt DC CharacteristicsSymbol Parameter Maximum Rating Symbol Parameter Min Typ Max I/O Buffer Sourcing and Sinking Limit Bus LoadingTable A-5. Capacitance of Rabbit 4000 I/O Ports Table A-6. External Capacitive Bus Loading -40C to +85C Iord Table A-8. Preliminary Data and Clock Delays Output Delay30 pF 60 pF 90 pF Ns setting No dbl / dbl Clock to Address Worst-Case Conformal Coating Conformally coated Area 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 Mechanical Dimensions and Layout 935 Table B-1. Prototyping Board Specifications Power SupplyParameter Specification Using the Prototyping Board Signals Pin Pin Name Prototyping Board Use Adding Other Components Measuring Current Draw 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 Table B-5. Prototyping Board Serial Port Configurations Serial Port Header Default Use Alternate Use 4.1 RS-232 Prototyping Board Jumper Configurations Table B-6. RCM3400 Prototyping Board Jumper Configurations JP5 LN4IN-LN6IN 108 Power Supplies Appendix C. Power SupplyBattery-Backup Circuits Reset Generator 165 mA·h = 2.5 years User’s Manual 111 112 Index SMODE0 SMODE1 ADCALALL.C User’s Manual 115 116 Schematics