Analog-to-Digital Converter Design Guide High-Performance, Stand-
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Analog-to-Digital Converter Design Guide
High-Performance, Stand-Alone Converters Variety Embedded Systems Applications
Design ideas this guide following devices. complete device list corresponding data sheets these products found www.microchip.com Dual-Slope Converters TC500A TC7109A TC510 TC514 TC530 TC534 Successive Approxmation Register (SAR) Converters MCP300X MCP3021 MCP320X MCP3221 MCP330X Output Converters TC835 TC7135 TC14433A Binary Output Converter TC850 Display Analog-to-Digital Converters TC7106A TC7116A TC7117A TC7126A TC7136 TC820
High-Performance, Stand-Alone ADCs Variety Embedded Systems Applications SELECTING RIGHT
Selecting most suitable converter (ADC) your application based more than just precision bits. Different architectures available, each exhibiting advantages disadvantages various data-acquisition systems. required accuracy precision system puts category based number bits required. important always design your system allow more bits than initially required: application calls bits accuracy, choose 12-bit converter. achievable accuracy converter will always less than total number bits available. Depending system requirements, your accuracy might better expressed micro-volts, decibels LSBs (least significant bits). showing frequency spectrum device useful determining noise performance given device. Microchip stand-alone ADCs show typical performance data specifications, such THD, SINAD SNR. following table shows performance, V/V, through 24-bit converters. Typically, amplifier required magnitude input signal significantly lower than full-scale input range ADC. However, selecting with higher resolution, need amplifier eliminated. Performance Table Through 24-bit Converters
Successive Approximation Register (SAR) converters typically range from bits. Delta-sigma converters achieve accuracy bits will covered more detail subsequent design guide. figure below shows different architectures bits bandwidth. Architecture Bits Bandwidth
Application Examples:
Seismic Recording different devices connected central processing unit monitor vibrations. Each device measures signal extremely fast rate, less than High accuracy required large signal size, speed utmost importance. high-speed converter would best selection this application. Voice-Band Recording human detect signals from roughly kHz. application telephone intercom system where high-fidelity audio concern, 60-70 dynamic range sufficient. Based these bandwidth dynamic range requirements, either medium speed (50-200 ksps) delta-sigma converter would work this application.
Bits 1024 4096 16384 65536 262144 1048576 4194304 16777216 3.91 15.3 3.81 59.5 Resolution 0.391 0.0977 0.0244 0.0061 0.00153 0.000381 9.54E-05 2.38E-05 5.95E-06 Resolution (ppm) 3910 15.3 3.81 0.954 0.238 0.0595 Resolution (dB) 48.16 60.21 72.25 84.29 96.33 108.37 120.41 132.45 144.49
Converter Function Pack Design Guide
High-Performance, Stand-Alone ADCs Variety Embedded Systems Applications ARCHITECTURE CONVERTERS
(Successive Approximation Register) applies converter that uses approximation convert analog input signal into digital output code. converters typically 16-bit range have sample speeds MSPS. major benefit converter ability connected multiplexed inputs high data acquisition rate. input sampled held internal capacitor, this charge converted digital output code using successive approximation routine. Since this charge held throughout conversion time, only initial sample hold period acquisition time concern fast-changing input. conversion time same conversions. This makes converter ideal many real-time applications, including motor control, touch-screen sensing, medical other data acquisition systems. Successive Approximation Register (SAR)
When designing system with converter, following specifications terms should understood: Acquisition Time time required sampling mechanism capture voltage after sample command given hold capacitor charge. Conversion Time time required converter complete single conversion once signal been sampled. Throughput Rate Samples Second (SPS) time required converter sample, acquire, digitize, prepare, output conversion. Integral Non-Linearity (INL) Specification most relevant overall accuracy converter. maximum deviation transition point conversion corresponding transition point ideal conversion. represents cumulative errors. Differential Non-Linearity (DNL) error width between output conversion codes. maximum deviation code width from ideal code width (FSR/2^n). errors less than correspond missing code. Missing Code situation where converter will never output specified code regardless input voltage. Monotonic Implies that increase decrease) analog input voltage will always produce change increase decrease) output code. Monotonicity does imply that there missing codes. Bipolar Unipolar Output Differential converters give bipolar output corresponding positive negative numbers. binary output scheme usually two's complement. unipolar output corresponding positive output, from VREF.
Converter Function Pack Design Guide
High-Performance, Stand-Alone ADCs Variety Embedded Systems Applications CONVERTERS INDUSTRY'S LOWEST-POWER ADCs SOT-23A PACKAGES
MCP3021 MCP3221 low-power, tiny 12-bit ADCs that ideal battery powered portable data acquisition systems. Based advanced CMOS architecture, these devices draw only I2Cclock. With clock, current drops less than With only standby current, MCP3221 currently world's lowest-power, 12-bit small SOT23A package. Communication either device performed using 2-wire compatible interface. on-chip conversion clock enables independent timing between conversion clock, serial communication data rate. devices also addressable, allowing eight devices single 2-wire bus. MCP3021 MCP3221 single supply voltage that operates over broad voltage range 2.7V 5.5V. Accuracy superb, providing less than differential non-linearity (DNL) less than integral non-linearity (INL).
MCP3221 Functional Block Diagram Digital Code Graph
MCP3021 MCP3221 Features:
10-bit resolution (MCP3021) 12-bit resolution (MCP3221) ksps I2CFast Mode DNL, max. (MCP3021) DNL, max. (MCP3221) On-chip sample hold compatible serial interface with devices single 2-wire bus: Standard Mode Fast Mode Single-supply specified operation: 2.7V 5.5V Low-power CMOS technology: standby current active current ksps Temperature range: Industrial: -40°C +85°C (MCP3221) Extended: -40°C +125°C
MCP3021 MCP3221 Applications:
Data Logging Multi-zone Monitoring Hand-held Portable Applications Battery-powered Test Equipment Remote Isolated Data Acquisition Voice-band Applications
Product Specifications
Resolution (bits) Maximum Sampling Rate (samples/sec) Input Channels Input Voltage Range Active Current Max. (µA) Max. Temperature Range (C°) +125
Device MCP3021 MCP3221
Input Type Single-ended Single-ended
Interface I2CI2C
Packages SOT-23A SOT-23A
Converter Function Pack Design Guide
High-Performance, Stand-Alone ADCs Variety Embedded Systems Applications CONVERTERS LOW-POWER KSPS KSPS, 12-BIT ADCs
MCP3001 MCP3201 12-bit ADCs that offer standby currents less than active currents ksps. Both devices offer on-board sample hold circuitry. Each device pseudo-differential input with exceptional linearity specifications over temperature. Communication with device accomplished using simple serial interface compatible with SPIprotocol. Both devices operate over broad voltage range 2.7V 5.5V.
MCP3001
MCP3001 MCP3201 Features:
10-bit resolution (MCP3001) 12-bit resolution (MCP3201) DNL, max. (MCP3001) DNL, max. (MCP3201) On-chip sample hold SPIserial interface (modes 1,1) Single-supply specified operation: 2.7V 5.5V 10-bit, ksps sampling rate 2.7V (MCP3001) 10-bit, ksps sampling rate (MCP3001) 12-bit, ksps sampling rate 2.7V (MCP3201) 12-bit, ksps sampling rate (MCP3201) Low-power CMOS technology: standby current active current ksps Industrial: -40°C +85°C Product Specifications
Resolution (bits) Maximum Sampling Rate (samples/sec) Input Channels
MCP3001 MCP3201 Applications:
Sensor Interface Process Control Data Acquisition Battery-Operated Systems
Temperature range:
Device MCP3001 MCP3201
Input Type Pseudo-Diff. Single-ended
Interface SPISPI
Input Voltage Range
Active Current Max. (µA)
Max.
Temp. Range (C°)
Packages PDIP MSOP SOIC, TSSOP PDIP SOIC, TSSOP
Converter Function Pack Design Guide
High-Performance, Stand-Alone ADCs Variety Embedded Systems Applications CONVERTERS LOW-POWER, MULTI-CHANNEL ADCs IDEAL PORTABLES
With channels that configurable either pseduo-differential single-ended, MCP3X02/4/8 converters versatile powerful ADCs. Industry-leading low-power technology offers current consumption these multi-channel devices: standby ksps. With exceptional performance LSB) across broad voltage temperature ranges (2.7V 5.5V +85°C), multi-channel applications requiring superb linearity ideal these devices. These dual-channel devices programmable either pseduo-differential pairs single-ended inputs. quad-channel devices programmable provide pseudo-differential pairs single-ended inputs. Communication accomplished using industry standard serial SPIprotocol.
MCP3X02/4/8 Features:
10-bit 12-bit resolution DNL, max. DNL, max. On-chip sample hold SPIserial interface (modes 1,1) Single-supply specified operation: 2.7V 5.5V Low-power CMOS technology: standby current active current ksps
MCP3X02/4/8 Applications:
Multi-channel Data Acquisition Portables Sensor Interface Process Control Data Acquisition Battery Operated Systems
Product Specifications
Resolution (bits) Maximum Sampling Rate (samples/sec) Input Channels Input Voltage Range Active Current Max. (µA) Max. Temp. Range (C°)
Device MCP3002
Input Type Single-ended PseudoDifferential Single-ended PseudoDifferential Single-ended PseudoDifferential Single-ended Single-ended Single-ended
Interface I2C
Packages PDIP MSOP SOIC, TSSOP PDIP SOIC, TSSOP
MCP3004
SPI
MCP3008
PDIP SOIC, TSSOP
MCP3202 MCP3204 MCP3208
PDIP SOIC, TSSOP PDIP SOIC, TSSOP PDIP SOIC
Converter Function Pack Design Guide
High-Performance, Stand-Alone ADCs Variety Embedded Systems Applications
CONVERTERS 13-BIT DIFFERENTIAL INPUT IDEAL INTERFACING SENSORS
MCP330X family data converters offers true differential input with bipolar two's complement output. Strain gauges, wheatstone bridges, signals ideally interfaced differential input ADCs. These ADCs provide single differential input, differential input four differential inputs. power consumption these devices ksps, addition their high resolution, makes these sensors ideal portable measurement applications.
MCP330X Features:
Full Differential Inputs with 13-bit Resolution max. max. max. Number Single-ended Inputs: (MCP3301) (MCP3302) (MCP3304) On-chip sample hold SPIserial interface (modes 1,1) Single-supply specified operation: 2.7V 5.5V Low-power CMOS technology: standby current active current ksps ksps sampling rate with supply current Temperature Range: -40°C
MCP330X Applications:
Remote Sensors Battery Operated Systems Transducer Interface
Product Specifications
Resolution (bits) Maximum Sampling Rate (samples/sec) Input Channels Input Voltage Range Active Current Max. (µA) Max. Temp. Range (C°)
Device MCP3301 MCP3302 MCP3304
Input Type Differential Differential Differential
Interface SPISPI
Packages PDIP MSOP SOIC PDIP SOIC, TSSOP PDIP SOIC
Converter Function Pack Design Guide
High-Performance, Stand-Alone ADCs Variety Embedded Systems Applications ARCHITECTURE DUAL-SLOPE /INTEGRATING
dual-slope converter operates charging capacitor from input voltage during fixed time, then discharging zero. Actual data conversion accomplished phases: input signal integration reference voltage de-integration. integrator output initialized prior start integration. During integration, analog switch connects integrator input, where maintained fixed time period (tINT). application causes integrator output depart rate determined magnitude VIN, direction determined polarity VIN. de-integration phase initiated immediately expiration tINT.
During de-integration, connects reference voltage (having polarity opposite that VIN) integrator input. same time, external precision timer started. de-integration phase maintained until comparator output changes states, indicating integrator returned starting point When this occurs, precision timer stopped. de-integration time period (tDEINT), measured precision timer, directly proportional magnitude applied input voltage. simple mathematical equation relates input signal, reference voltage integration time: (1/RINTCINT)*integral from tINT constant VREF (tDEINT tINT) dual-slope converter accuracy unrelated integrating resistor capacitor values long they stable during measurement cycle.
inherent benefit noise immunity. Input noise spikes integrated (averaged zero) during integration periods. Integrating ADCs immune large conversion errors that plague successive approximation converters high-noise environments. Integrating converters provide inherent noise rejection, with least dB/decade attenuation rate. Interference signals with frequencies integral multiples integration period are, theoretically, completely removed since average value sine wave frequency (1/t) averaged over period zero.
Converter Function Pack Design Guide
High-Performance, Stand-Alone ADCs Variety Embedded Systems Applications DUAL-SLOPE 17-BIT PLUS SIGN SERIAL
Accepts Bipolar Inputs ±4.2V
TC5XX family precision analog front ends that implement dual-slope ADCs with maximum resolution bits plus sign. TC500 base device that requires both positive negative power supplies, while TC510 adds on-board power supply conversion single-supply operation. conversion speed converter configurable, with user being able trade conversion speed resolution. With single multi-channel devices, TC5XX powerful family dual-slope converters. 50/60 noise rejection, low-power operation, minimum connections, make these devices suitable variety data acquisition systems.
TC5XX Features:
Precision bits) Converter "Front End" 3-Pin Control Interface Microprocessor Flexible: User Trade-off Conversion Speed Resolution Single-Supply Operation (TC510/TC514) Input, Differential Analog (TC514) Automatic Input Voltage Polarity Detection Wide Analog Input Range: ±4.2V (TC500A/TC510)
TC5XX Features (Cont.)
Directly Accepts Bipolar Differential Input Signals Power Dissipation: (TC500/TC500A), (TC510/TC514)
TC5XX Applications:
Precision Analog Signal Processor Precision Sensor Interface High-Accuracy Measurements
Product Specifications
Part
TC500A TC510
Supply Voltage
±4.5 ±7.5 +4.5 +5.5
Input Voltage Range
1.5V 1.5V 1.5V 1.5V 1.5V 1.5V 1.5V 1.5V 1.5V 1.5V
Resolution Input
bits bits bits bits bits
Sampling Rate (Conv/s)
Inptut Channels
Data Interface
3-Wire 3-Wire
Temp. Range (°C)
Features
Differential input range, Programmable resolution/conversion time Differential input range, Programmable resolution/conversion time, Charge pump (-V) output Differential input range, Programmable resolution/conversion time, Charge pump (-V) output Optional serial interface adapter TC500/A/510/514 Differential input range, Programmable resolution/conversion time, Charge pump (-V) output Differential input range, Programmable resolution/conversion time, Charge pump (-V) output
Packages
PDIP SOIC, CerDIP PDIP SOIC
TC514
+4.5 +5.5
3-Wire
PDIP SOIC
TC520A TC530
+4.5 +5.5 +4.5 +5.5
Serial Port Serial Port
PDIP SOIC PDIP SOIC
TC534
+4.5 +5.5
Serial Port
PDIP PQFP
Converter Function Pack Design Guide
High-Performance, Stand-Alone ADCs Variety Embedded Systems Applications ARCHITECTURE 31/2 41/2-DIGIT ADCs WITH SEGMENT DRIVE
With complete data acquisition system on-chip, these devices directly drive multiplexed, liquid crystal displays (LCDs). TC7107A drives common anode light emitting diode (LED) displays directly with segment. Seven segment decoders, digit polarity drivers, voltage references, clock circuits integrated chips. low-cost, high-resolution indicating meter requires only display handful resistors capacitors. 31/2 digit digit options, along with extended features power options, make TC711X, TC712X, TC713X devices ideal multimeters digital measurement devices.
TC71XX Features:
Internal References with Temperature Drift
TC7126: ppm/°C Typical TC7117: ppm/°C Typical Directly Drives display Convenient Battery Operation TC7116/TC7136/TC7126 Differential Input Operation
Industrial Temperature Range: -40°C 85°C
TC71XX Applications:
Full-featured Multimeters
Bridge Readouts Portable Instrumentation
Digital Measurement Devices
Product Specifications
Part TC7106A TC7107A TC7116A TC7117A TC7126A TC7129 TC7136A TC820 Display Type Supply Voltage Resolution (Digits) Digit High Power with Hold with Digit Power 3.75 Resolution (Counts) ±2,000 ±2,000 ±2,000 ±2,000 ±2,000 ±20,000 ±2,000 ±4,000 Power (mV) Temp. Range (°C) Features DMM, DPM, Data logger applications DMM, DPM, Data logger applications Hold function Hold function Power TC7106 Lowest noise sensitivity Low-power Noise TC7106 plus frequency counter logic probe Packages PDIP PLCC, PQFP CerDIP PDIP PLCC, PQFP CerDIP PDIP PLCC, PQFP CerDIP PDIP PLCC, PQFP CerDIP PDIP PLCC, PQFP CerDIP PDIP PLCC, PQFP CerDIP PDIP PLCC, PQFP CerDIP PDIP PLCC, PQFP CerDIP
Converter Function Pack Design Guide
High-Performance, Stand-Alone ADCs Variety Embedded Systems Applications ARCHITECTURE 41/2-DIGIT WITH OUTPUT
These 4-1/2-digit converters offer part 20,000) resolution, with maximum nonlinearity error count. auto-zero cycle reduces zero error below zero drift µV/°C. Source impedance errors minimized maximum input current. Rollover error limited count. Microprocessor-based measurement systems supported BUSY, STROBE, RUN/HOLD control signals. Remote data acquisition systems with data transfer UARTs also possible. additional control pins multiplexed outputs ideal display microprocessor-based measurement systems.
Features:
Features (Cont.)
Industry standard pin-out, compatible with ICL7135, MAX7135, SI7135 Rollover Error: Count Nonlinearity Error: Count Reading Input True Polarity Indication Zero Null Detection Multiplexed Data Output TTL-Compatible Outputs Differential Input Control Signals Permit Interface UARTs Microprocessors
Blinking Display Visually Indicates Overrange Condition Input Current: Zero Reading Drift: µV/°C Auto-Ranging Supported with Overrange Underrange
Applications:
Personal Computer Data Acquisition Scales, Panel Meters, Process Controls HP-IL Instrumentation
Product Specifications
Description Part TC14433A TC7135 TC835 Supply Voltage ±4.5 Input Voltage Range ±199.9 1.999V 1.0V 1.0V 1.0V 0.5V Resolution (Digits) Resolution (Counts) ±2,000 ±20,000 ±20,000 Power (mW) Data Interface MUXed MUXed MUXed Temp. Range (°C) Features DMM, Data loggers DMM, Data loggers Upgrade TC7135 Packages PDIP PLCC, CerDIP PLCC, PDIP PQFP PQFP PQFP PDIP
Converter Function Pack Design Guide
High-Performance, Stand-Alone ADCs Variety Embedded Systems Applications ARCHITECTURE 15-BIT BINARY OUTPUT INCLUDES AUTO-ZEROED AMPLIFIERS
TC850 monolithic CMOS converter (ADC) with resolution 15-bits plus sign. combines chopperstabilized buffer integrator with unique multi-slope integration technique that increases conversion speed. result 16-time improvement speed over previous 15-bit, monolithic integrating ADCs (from conversions second second). Faster conversion speed especially welcome systems with human interface, such digital scales. TC850 incorporates microprocessorcompatible digital interface. Only voltage reference few, noncritical, passive components required form complete 15-bit plus sign ADC. CMOS processing provides TC850 with high-impedance differential inputs. Input bias current typically only permitting direct interface sensors. Input sensitivity Least Significant (LSB) eliminates need precision external amplifiers. internal amplifiers auto-zeroed, ensuring zero digital output with analog input. Zero-adjustment potentiometers calibrations required. TC850 outputs data 8-bit, 3-state bus. Digital inputs CMOS-compatible, while outputs TTL/CMOScompatible. Chip-enable byte-select inputs, combined with end-of-conversion output, ensures easy interfacing wide variety microprocessors. Conversions performed continuously command. Continuous mode, data read three consecutive bytes manipulation address lines required. Operating from supplies, TC850 dissipates only
Features:
15-bit Resolution Plus Sign Conversions Second Integrating Technique Monotonic High Noise Immunity Auto-zeroed Amplifiers Eliminate Offset Trimming Wide Dynamic Range: Input Bias Current: Input Noise: µVP-P Sensitivity: Flexible Operational Control Continuous On-demand Conversions
Supply Voltage
Data Valid Output Compatible, 3-State Data Outputs 8-bit Data Simple Interface Chip Enables Read Result Like Memory Power Supply Operation:
Applications:
Precision Analog Signal Processor Precision Sensor Interface High Accuracy Measurments
Product Specifications
Description Part TC850 Binary Input Voltage Range 1.5V 1.5V Resolution (Digits) 15-bit Resolution (Counts) ±32,768 Power (mW) Data Interface 8-bit Parallel Temp. Range (°C) Features Highest conversion speed conv/sec) Packages PLCC, PDIP CerDIP
Converter Function Pack Design Guide
High-Performance, Stand-Alone ADCs Variety Embedded Systems Applications ARCHITECTURE 12-BIT DUAL-SLOPE WITH SERIAL PARALLEL BINARY OUTPUT
TC7109A 12-bit plus sign, CMOS low-power Analog-toDigital converter. Only eight passive components crystal required form complete dual-slope integrating ADC. improved source current other TC7109A features make attractive per-channel alternative analog multiplexing many data acquisition applications. These features include typical input bias current drift less than µV/°C, input noise typically µVP-P auto-zero. True differential input reference allow measurement bridge-type transducers, such load cells, strain gauges, temperature transducers. TC7109A provides versatile digital interface. Direct mode, chip select HIGH/LOW byte enable control parallel interface. Handshake mode, TC7109/A will operate with industry standard UARTs controlling serial data transmission ideal remote data logging. Control monitoring conversion timing provided RUN/HOLD input STATUS output. applications requiring more resolution, TC500, 15-bit plus sign data sheet.
Features:
Zero Integrator Cycle Fast Recovery from Input Overloads Eliminates Cross-Talk Multiplexed Systems 12-Bit Plus Sign Integrating Converter with Overrange
Applications:
Indication Sign Magnitude Coding Format True Differential Signal Input Differential Reference Input Noise: µVP-P Typ. Input Current: Typ. Zero Adjustment Needed Compatible, Byte Organized Tri-state Outputs UART Handshake Mode Simple Serial Data Transmissions
Ideal remote data logging Bridge-type Transducer Measurements Load Cells Strain Gauges Temperature Transducers
Product Specifications
Part TC7109A Supply Voltage Input Voltage Range 1.5V 1.0V Resolution (Digits) bits plus sign Sampling Rate (Conv/s) ±32,768 Input Channels Data Interface Parallel Serial Temp. Range (°C) Features Differential Input Range Packages PDIP CerDIP PLCC, PQFP
Converter Function Pack Design Guide
DEVELOPMENT TOOLS MXLAB® Software Tool
MXLAB software tool provides data acquisition, analysis display Windows®system environment. Additionally, analysis made digital potentiometer shutdown, reset daisy-chain operations. MXLAB software determine digital potentiometer settings based gain inputs V/V), filter cutoff frequencies offset voltage levels. MXLAB software downloaded free from Microchip site www.microchip.com. MXLAB Windows software contains variety tools interface MXDEV®Analog Evaluation System. These tools provide different methods troubleshooting analog circuit either time frequency domain: Fast Fourier Transform (FFT) Histogram Oscilloscope Real-time numeric Real-time stripchart Data List
MXLAB® Screen Captures
MXDEV® Analog Evaluation System
MXDEV® Analog Evaluation System versatile easy-to-use system evaluating Microchip's mixedsignal products. system used with consists parts: DVMCPA Driver Board with associated MXLAB software, which provides data acquisition, analysis display Windows environment; DVxxxxx Evaluation Board, which contains device evaluated. Evaluation boards currently available MCP3001/02 MCP3004/08 10-bit ADCs, MCP3201/02 MCP3204/08 12-bit ADCs, MCP42XXX digital potentiometers. DV320x converter evaluation boards, input signal either from from on-board potentiometer external source. addition, low-pass filters inserted into signal path further flexibility. prototype area allows addition custom circuitry make powerful tool evaluation development. DV42xxx digital potentiometer evaluation board shows MCP42xxx being used many popular digital applications. These circuits include programmable gain circuits, programmable filter circuit programmable circuit. Digital potentiometer tools within MXLAB system calculate wiper values these circuits based user inputs gain V/V), filter cutoff frequency approximation method, offset voltage. addition, on-board that allows analysis these circuits, using time frequency domain tools MXLAB software. Microchip Ordering Part Numbers; DVMCPA MXDEV Analog Evaluation Driver Board Version DV3201A MCP3001/3002 MCP3201/02 Converter Evaluation Board DV3204A MCP3004/3008 MCP3204/08 Converter Evaluation Board DV42xxx MCP42xxx Digital Potentiometer
Converter Function Pack Design Guide
High-Performance, Stand-Alone ADCs Variety Embedded Systems Applications RELATED SUPPORT MATERIAL
following Application Notes available Microchip website: www.microchip.com. AN788: Numerical-Integration Techniques Speed Dual-Slope Conversion. using low-cost microprocessors program-controlled, numerical-integration technique, achieve good noise rejection take full advantage higher speeds offered dual-slope converters, such TC7109. AN789: Integrating Converter Analog Processor TC500A Today, design engineers rely more microprocessors microcontrollers support their applications. Compatible Analog-to-Digital (A/D) Digital-to-Analog (D/A) converters have greatly increased flexibility interface control circuits. AN796: TC7109 Records Remote Data Automatically TC7109 analog-to-digital converter, Kbytes CMOS static RAM, some gates counters combined form low-cost, flexible, stand-alone data-logging system. AN842: Differential Biasing Techniques, Tips Tricks This application note discusses differential input configurations their operation circuits implement these input modes techniques choosing correct voltage levels. AN845: Communicating with MCP3221 Using PICmicro® Microcontrollers. This application note covers communications between MCP3221 device PICmicro® microcontroller. Hardware software implementations I2Cprotocol covered.
Application Notes:
AN246: Driving Analog Inputs Converter Driving Converter (ADC) challenging issues trade-offs understood from beginning. With Successive Approximation Register (SAR) ADCs, sampling speed source impedance should taken into consideration device fully utilized. This application note discusses issues surrounding converter's input conversion nuances insure that converter handled properly from beginning design phase. AN681: Reading Using Fast Fourier Transformation (FFT) This application note focuses plots illustrate performance converters. FFTs help identify noise interference, power supply, analog device performance. AN688: Layout Tips 12-Bit Converter Application This application note describes basic converter layout guidelines, ending with review issues aware Examples good layout techniques provided. AN693: Understanding Converter Performance Specifications. This application note describes specifications used quantify performance converters gives reader better understanding significance those specifications application. AN695: Interfacing Pressure Sensors Microchip's Analog Peripherals This application note concentrates signal conditioning path piezoresistive sensing element from sensor microcontroller. shows electrical output this sensor gained, filtered digitized order prepare microcontroller's calibration routines. AN780: 15-Kilogram Scale Using TC500A TC520 weighing scale designed using Microchip's TC500A Analog Processor TC520 16-bit Controller. scale required resolve down gram correct within 6-1/2 grams. AN781: Solving Sensor Offset Problems with TC7106 Design engineers sometimes have interface TC7106 similar ADCs "non-ideal" sensors. very common problem that sensor often does give "zero" output where design wants zero reading. AN783: Power Supply Operation with TC7106A/7107A This application note describes TC7106A/7107A 3-1/2 digit analog-to-digital converters with liquid crystal display drive powered from power supplies using low-cost regulators, such TC55 (+5V). AN785: Simplify Converter Interface with Software Unfortunately, many display-oriented ADCs difficult interface multiplexed format outputs. exception 4-1/2 digit TC7135 ADC, which provides "strobe" output.
Demonstration/Evaluation Board User Guide:
MCP3XXX Evaluation User's Guide (DS51220): This document describes MCP3XXX Evaluation Board evaluate Microchip's stand-alone MCP3XXX converters.
Converter Function Pack Design Guide
Microchip Technology Inc. leading provider microcontroller, analog memory products that provide risk-free product development, lower total system cost faster time-to-market thousands diverse customer applications worldwide. Microchip's commitment quality innovation coupled with world-class development tools, dependable delivery outstanding technical support sets apart.
Integration first market with integrated with Reset Controller with temperature sensor integrates MUX, resistive ladder, gain switches, high-performance amplifier, SPIinterface Space Savings Resets LDOs SC70, ADCs 5-lead SOT-23A IrDA®standard protocol stack embedded 18-pin package Accuracy Offset trimmed after packaging using non-volatile memory Innovation pin-count embedded IrDA® standard stack, FanSensetechnology Select Modeoperation more information, visit Microchip site www.microchip.com
Analog Interface Attributes
Robustness MOSFET Drivers lead industry latch-up immunity/ stability Low-Power/Low-Voltage family with lowest power given gain bandwidth nA/1.4V/10 bandwidth Amps 1.8V charge pumps comparators Lowest power 12-bit SOT-23 package
Leading Provider Microcontroller Analog Products
Microchip Technology Inc. 2355 Chandler Blvd. Chandler, 85224-6199 (480) 792-7200 (480) 792-9210
Information subject change. Microchip name logo, registered trademarks Microchip Technology Incorporated U.S.A. other countries. PICmicro registered trademark Microchip Technology. FanSense, Select Mode, MXLAB MLDEV trademarks Microchip Technology U.S.A. other countries. trademark Motorola. trademark Philips Corporation. IrDA registered trademark Infrared Data Association. other trademarks mentioned herein property their respective companies. 2004 Microchip Technology Inc. rights reserved. DS21841A 6/2004
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