Analog Devices’ Products and Signal Chain Solutions for Field Instrument/Smart Transmitter Design ADI Field Instrument Segment Overview Analog Devices is a leading supplier of industrial precision signal measurement solutions. These products are designed into field instruments in process and manufacturing plants across a wide range of industries including chemical and pharmaceutical, hydrocarbon (oil and gas), environmental (waste water and treatment), and food and beverage. The combination of ADI’s proven system expertise in industrial applications and a comprehensive portfolio of products with leading performance vs. power makes ADI a strong partner for engineers designing field instruments. Main Challenges and System Considerations • High reliability, longevity of supply, and lower assembly and manufacturing costs • Operation in harsh environments requiring support for a wide temperature range • Limited available power for looppowered instruments drives the need for components with high performance at very low power • Increasing end market need for higher levels of functional safety Field Instrument Applications Why Choose ADI? • ADI is a technology leader in precision converters and signal processing with a long history of serving the needs of industrial customers • ADI’s dedicated team of industrial application engineers provides system expertise to support our customers through their complete design cycle • ADI is continually investing in core technology and application specific products to meet current and future industrial needs • Long product life cycles, superior reliability, and on time delivery • Best-in-class signal chain solutions for precision measurement over a wide range of sensor inputs with high accuracy and very low power www.analog.com • Temperature transmitters • Pressure transmitters • Electromagnetic flow transmitters • Ultrasonic flow transmitters • Differential pressure flow transmitters Temperature Transmitter LDO DC-TO-DC STEP DOWN HART MODEM INTEGRATED SOLUTION DAC RTD THERMOCOUPLE MUX AMP ADC ISOLATION CURRENT SOURCES REF MICROCONTROLLER/ INTEGRATED SOLUTION TEMPERATURE SENSOR 4mA TO 20mA OUTPUT PROTECTION AMP REF PROFIBUS CAN RS-485 RS-232 WIRELESS Pressure Transmitter LDO DC-TO-DC STEP DOWN HART MODEM TEMPERATURE SENSOR INTEGRATED SOLUTION DAC OUT+ MUX IN– RESISTIVE BRIDGE AMP ADC REF MICROCONTROLLER/ INTEGRATED SOLUTION ISOLATION IN+ OUT– 4mA TO 20mA OUTPUT PROTECTION AMP REF PROFIBUS CAN RS-485 RS-232 WIRELESS Pressure and Temperature Analog Front End A wide portfolio of very low power precision converters and integrated solutions to meet the requirements of temperature and pressure transmitters. Part Number Description Integrated Digital Temperature Sensor ADT7320/ADT7420 ±0.25°C accurate, 16-bit SPI/I2C temperature sensor ADC AD7793/AD7794/ AD7799 16-/24-bit, 3-channel/6-channel, low noise, low power, Σ-Δ ADC with on-chip in-amp Key Features and Benefits • ±0.25°C accuracy from –20°C to +105°C at 3.3 V • Ultralow temperature drift: 0.0073°C • Easy implementation • Low power • • • • • 16-bit/24-bit versions available Low power: 400 μA Internal programmable gain amplifier 4 ppm/°C on-chip reference (AD7793/AD7794) Programmable current sources (AD7793/AD7794) • Low-side power switch (AD7794, AD7799) • • • • • • • Analog performance • Dual PGA and 24 bit, 4 kSPS ADCs • 12 multiplexed analog inputs • 12-bit DAC • Power consumption only 1 mA with core operating at 500 kHz (both ADCs on, input buffers off, PGA gain of 4, one SPI port on, and all timers on) • Package and temperature • 48-lead LFCSP (7 mm × 7 mm) • –40°C to +125°C Burnout currents Internal clock and buffer Simultaneous 50 Hz and 60 Hz rejection 4.17 SPS to 400 SPS output data rate Supply: 2.7 V to 5.25 V Temperature: –40°C to +105°C Microcontroller ADuCM360/ ADuCM361 Low power precision analog microcontroller, ARM Cortex™-M3 with dual/single Σ-∆ ADCs ADuC7060/ ADuC7061 Low power, precision analog microcontroller, dual Σ-∆ ADCs, flash/EE, 16-/32-bit ARM7TDMI® | Field Instrument/Smart Transmitter Design 2 • Digital performance • 32-bit ARM Cortex-M3 processor • 128 kB flash, 8 kB SRAM • Dual 24-bit 8 kSPS Σ-∆ ADCs • Single 14-bit DAC • ARM7TDMI 16-/32-bit RISC controller • 32 kB flash and 4 kB SRAM • UART, SPI, GPIO, PWM • Nominal supply 2.5 V • Temperature range: –40°C to +125°C Electromagnetic Flow Transmitter CURRENT SOURCE DC-TO-DC STEP-DOWN HART MODEM LDO REF GATE DRIVER 4mA TO 20mA DAC REF MUX AMP ADC INTEGRATED SOLUTION MCU ISOLATION IN-AMP AMP OUTPUT PROTECTION PROFIBUS CAN RS-485 RS-232 INTEGRATED SOLUTION WIRELESS TEMPERATURE SENSOR WATCHDOG TIMER Electromagnetic Flow Transmitter Analog Front End Part Number Description Instrumentation Amplifier AD8228 Low gain drift precision instrumentation amplifier Key Features and Benefits • Fixed G = 10, 100 • 650 kHz –3 dB bandwidth (G = 10) • Wide power supply range: ±2.3 V to ±18 V • 2 ppm/°C max gain drift • 2 V/µs slew rate • 8 nV/√Hz @ 1 kHz min • 100 dB CMRR to 10 kHz (G = 10) • 0.8 μV/°C max voltage offset drift Multiplexer ADG1611 1 Ω typical on resistance, ±5 V, +12 V, +5 V, and +3.3 V quad SPST switches • 1 Ω on resistance • 0.2 Ω on resistance flatness ADG1411 1.8 Ω max on resistance, ±15 V/12 V/±5 V, iCMOS,® quad SPST switch • 1.5 Ω on resistance • 0.3 Ω on resistance flatness • Low offset voltage: 25 µV max • Low input bias current: <1.0 nA max • Low noise: 7 nV/√Hz typical Amplifier ADA4077-2 4 MHz, 7 nV/√Hz, low offset and drift, high precision amplifier • Low offset voltage drift: 0.25 µV/°C max • Low supply current: 400 µA per amplifier typical Voltage Reference ADR3412/ADR3420 ADR3425/ADR3430 Low power, 10 ppm/°C CMOS voltage reference ADR3433/ADR3440 (1.20 V/2.048 V/2.50 V/3.00 V/3.30 V/4.096 V/5.00 V) ADR3450 • Low quiescent current: 100 µA max • Initial accuracy: ±0.1% • Low frequency noise: <10 µV p-p (0.1 Hz to 10 Hz) • Max temperature coefficient: 8 ppm/°C • Wide temperature range: –40°C to +125°C operation • 4.7 Hz to 4.8 kHz output data rate • Offset drift: 5 nV/°C • PGA: gain from 1 to 128 • Gain drift: 1 ppm/°C • Analog performance • Dual PGA and 24-bit, 4 kSPS ADCs • 12 multiplexed analog inputs • 12 bit DAC • Power consumption only 1 mA with core operating at 500 kHz (both ADCs on, input buffers off, PGA gain of 4, one SPI port on, and all timers on) • Package and temperature • 48-lead LFCSP (7 mm × 7 mm) • –40°C to +125°C ADC AD7192 4.8 kHz ultralow noise 24-bit Σ-∆ ADC with PGA Microcontroller ADuCM360/ ADuCM361 Low power precision analog microcontroller, ARM Cortex-M3 with dual/single Σ-∆ ADCs • Digital performance • 32-bit ARM Cortex-M3 processor • 128 kB flash, 8 kB SRAM Digital Processor ADSP-BF504/ ADSP-BF504F/ ADSP-BF506F ADSP-BF50x fixed-point DSP • 400 MHz Blackfin® core • PPI for LCD display interface • True 12-bit, dual SAR ADC (ADSP-BF506F) • 32 MB executable flash (ADSP-BF504F/ ADSP-BF506F) • UART, SPI, SPORT, and CAN interfaces for communications www.analog.com | 3 Ultrasonic Flow Transmitter DC-TO-DC STEP-DOWN LDO TRANSDUCER DRIVER HART MODEM DAC REF DAC DAC MUX OUTPUT AMP 4mA TO 20mA PROTECTION INTEGRATED SOLUTION ADC VGA TEMPERATURE SENSOR CONTROLLER REFERENCE ISOLATION WATCHDOG TIMER PROFIBUS CAN RS-485 RS-232 WIRELESS Ultrasonic Flow Transmitter Analog Front End Part Number Multiplexer ADG1611 Description Key Features and Benefits 1 Ω typical on resistance, ±5 V, +12 V, +5 V, and +3.3 V quad SPST switches 1.8 Ω max on resistance, ±15 V/12 V/±5 V, iCOMS, quad SPST switch Integrated Digital Temperature Sensor ADG1411 ADT7320/ADT7420 ±0.25°C accurate, 16-bit SPI/I2C temperature sensor • 1 Ω on resistance • 0.2 Ω on resistance flatness • 1.5 Ω on resistance • 0.3 Ω on resistance flatness • ±0.25°C accuracy from –20°C to +105°C at 3.3 V • Ultralow temperature drift: 0.0073°C • Easy implementation • Low power ADC AD9609/AD9629/ AD9649 10-/12-/14-bit, 20 MSPS/40 MSPS/65 MSPS/ 80 MSPS, 1.8 V analog-to-digital converter • 2 V p-p analog input • 1.8 V to 3.3 V parallel and SPI interface • 74.3 dBFS SNR at 9.7 MHz input Variable Gain Amplifiers • LNA: • AD8331/AD8332/ AD8334 Single/dual/quad VGA with ultralow noise preamplifier and programmable RIN • Ultralow noise: 0.74 nV/√Hz; 2.5 pA/√Hz Active termination match via external resistor • VGA: • • • • 48 dB gain range Postamplifier with 12 dB gain switch: output SNR optimized for 10-/12-bit ADCs Fully differential Selectable output clamping levels DAC AD5641 2.7 V to 5.5 V, 100 μA, 14-bit nano DAC,® SPI interface in LFCSP and SC70 • Minimum board area • 14-bit in SC70 or 2 mm × 3 mm 6-lead LFCSP • Low power DAC • Max 100 μA supply current High Speed DAC • 175 MSPS DAC update rate ® AD9705 10-bit, 175 MSPS TxDAC digital-to-analog converter • Low power dissipation 12 mW at 80 MSPS, 1.8 V Power-down mode: <2 mW • SFDR to Nyquist • • 84 dBc at 5 MHz output • Wide supply range 1.7 V to 3.6 V • • On-chip 1 V reference • 400 MHz Blackfin core • PPI for LCD display interface • True 12-bit, dual SAR ADC (ADSP-BF506F) • 32 MB executable flash (ADSP-BF504F/ ADSP-BF506F) Digital Processor ADSP-BF504/ ADSP-BF504F/ ADSP-BF506F ADSP-BF50x fixed-point DSP | Field Instrument/Smart Transmitter Design 4 • UART, SPI, SPORT, and CAN interfaces for communications Differential Pressure Flow Transmitter LDO DC-TO-DC STEP DOWN HART MODEM IN+ REF OUT+ OUT– 4mA TO 20mA REF IN– IN+ MUX OUT+ AMP ADC MCU IN– ISOLATION DAC AMP OUTPUT PROTECTION INTEGRATED SOLUTION PROFIBUS CAN INTEGRATED SOLUTION RS-485 RS-232 WATCHDOG TIMER WIRELESS TEMPERATURE SENSOR Differential Pressure Flow Transmitter Analog Front End Part Number Description Integrated Digital Temperature Sensor ADT7320/ADT7420 ±0.25°C accurate, 16-bit SPI/I2C temperature sensor Key Features and Benefits • ±0.25°C accuracy from –20°C to +105°C at 3.3 V • Ultralow temperature drift: 0.0073°C • Easy implementation • Low power • Latch-up proof • Low on resistance: 13.5 Ω • 8 kV HBM ESD rating • Latch-up proof • Low on resistance: 160 Ω Multiplexer ADG5409 High voltage latch-up proof 4-channel/8-channel multiplexers ADG5209 High voltage latch-up proof 4-channel/8-channel multiplexers • 0.4 pC charge injection Amplifier AD8226 Wide supply range, rail-to-rail output instrumentation amplifier • Fully specified: –40°C to +125°C • Input noise: 22 nV/√Hz • Gain of 1 to 1000 • 350 μA typical supply current • 2.2 V to 36 V supply range ADC AD7794/AD7799 16-/24-bit, 3-channel/6-channel, low noise, low power, Σ-Δ ADC with on-chip in-amp • • • • • 16-/24-bit versions available Low power: 400 μA Internal programmable gain amplifier 4 ppm/°C on-chip reference (AD7794) Programmable current sources (AD7794) • Low-side power switch • • • • • • • Analog performance • Dual PGA and 24-bit, 4 kSPS ADCs • 12 multiplexed analog inputs • 12-bit DAC • Power consumption only 1 mA with core operating at 500 kHz (both ADCs on, input buffers off, PGA gain of 4, one SPI port on, and all timers on) • Package and temperature • 48-lead LFCSP (7 mm × 7 mm) • –40°C to +125°C Burnout currents Internal clock and buffer Simultaneous 50 Hz and 60 Hz rejection 4.17 SPS to 400 SPS output data rate Supply: 2.7 V to 5.25 V Temperature: –40°C to +105°C Microcontroller ADuCM360/ ADuCM361 Low power precision analog microcontroller, ARM Cortex-M3 with dual/single Σ-∆ ADCs ADuC7060/ ADuC7061 Low power, precision analog microcontroller, dual Σ-∆ ADCs, flash/EE, 16-bit/32-bit ARM7TDMI • Digital performance • 32-bit ARM Cortex-M3 processor • 128 kB flash, 8 kB SRAM • Dual 24-bit 8 kSPS Σ-∆ ADCs • UART, SPI, GPIO, PWM • Single 14-bit DAC • Nominal supply 2.5 V • ARM7TDMI 16-bit/32-bit RISC controller • Temperature range: –40°C to +125°C • 32 kB flash and 4 kB SRAM www.analog.com | 5 Isolation, Power, and Communication A wide range of supporting products to meet the various isolation, power, and communications requirements for temperature, pressure, and flow transmitters. Part Number Isolation Description ADuM3481 3.75 kV rms quad-channel digital isolator ADuM4401 5 kV rms quad-channel digital isolator ADuM1401 2.5 kV rms quad-channel isolator Key Features and Benefits • Small package: 20-lead SSOP • Low dynamic power consumption • Low voltage I/O: 1.8 V to 5.5 V • 50 year lifetime at 565 V pk • • • • • 16-lead SOIC wide package • 50 year lifetime at 565 V pk • 50-year lifetime at 565 V pk Low power operation Reinforced isolation rating Low power consumption 16-lead SOIC wide package Integrated DAC • Very low power: quiescent current: 300 µA max • HART compatible AD5421 16-bit, serial input, loop-powered, 4 mA to 20 mA DAC • 16-bit resolution and monotonicity, pin selectable NAMUR-compliant ranges • Internal regulator and reference • Total unadjusted error (TUE): 0.05% max • Output TC: 3 ppm/°C typ AD5420 16-bit, serial input, single-channel, 4 mA to 20 mA current source DAC • Current output ranges: 4 mA to 20 mA, 0 mA to 20 mA, or 0 mA to 24 mA • ±0.01% FSR typical total unadjusted TUE • ±3 ppm/°C typical output drift • On-chip reference and output fault detection • HART compatible • 12-bit accuracy guaranteed • On-chip, 1.25 V/2.5 V, 5 ppm/°C reference (AD5660) • Power-on reset to 0 V or midscale • 10 µs settling time DAC AD5660/AD5662 Single nano DAC, 16-bit monotonic DAC • Tiny 8-lead SOT-23 and MSOP packages Power Management/LDO ADP160 Ultralow quiescent current 150 mA, CMOS linear regulator ADP1720 50 mA, high voltage, micropower linear regulator • • • • Input voltage range: 2.2 V to 5.5 V IQ = 11 μA at 10 mA load Wide input voltage range: 4 V to 28 V IQ = 74 μA at 1 mA load • • • • Max output current: 150 mA Low dropout voltage: 195 mV @ 150 mA load Max output current: 50 mA Low dropout voltage: 275 mV @ 50 mA load Power management/DC-DC step-down ADP2441 36 V, 1 A, synchronous step-down dc-to-dc regulator ADP2370 High voltage, 1.2 MHz/600 kHz, 800 mA, low quiescent current buck regulator • • • • Wide input voltage range: 4.5 V to 36 V High efficiency up to 94% Adjustable output down to 0.6 V Input voltage range: 3.2 V to 15 V, output current: 800 mA • Quiescent current <14 µA in power saving mode (PSM) • ±1% output voltage accuracy • Adjustable frequency 300 kHz to 1 MHz • >90% efficiency • Force PWM pin (SYNC), 600 kHz/1.2 MHz frequency pin (FSEL) Amplifier AD5749 Industrial current out driver, single-supply, 55 V compliant with programmable ranges • IOUT range • 4 mA to 20 mA, 0 mA to 24 mA • 0.03% accuracy (TUE) • 2 ppm/°C full scale output drift • • • • 11.8 V to 55 V supply range Diagnostic/fault detection Digital input cyclical redundancy check External 4.096 V reference Voltage Reference ADR3525 Micropower, precision, 2.5 V voltage reference ADR4525 Ultralow noise, high accuracy 2.5 V voltage reference ADR291 Low noise micropower precision voltage reference (2.5 V) | Field Instrument/Smart Transmitter Design 6 • Max temperature coefficient (TC): 5 ppm/°C (B grade) • 100 μA max quiescence current • ±0.02% max initial error • Output noise (0.1 Hz to 10 Hz): <1.25 µV p-p @ 2.5 VOUT typical • Supply range: 2.8 V to 15 V • Supply current 12 µA max • Output noise (0.1 Hz to 10 Hz): 18 μV p-p at 2.5 V (typical) • 8-lead MSOP • Max temperature coefficient (TC) : 2 ppm/°C • Input voltage range: 3 V to 15 V • Low noise: 8 µV and 12 µV p-p (0.1 Hz to 10 Hz) • 10 ppm/°C • –40°C to +125°C operating temperature range Part Number HART Modem Description AD5700/AD5700-1 Low power HART modem Key Features and Benefits • HART-compliant fully integrated FSK modem • 115 µA maximum supply current in receive mode • On-chip oscillator (AD5700-1) • 4 mm × 4 mm, 24-lead LFCSP • Buffered HART output • Suitable for intrinsically safe applications • 30 Mbps data rate • 2.1 V min differential output with 54 Ω termination • Fully isolated digital interface • 50 nodes on bus • 5 V or 3.3 V operation • Low power 0.8 mA |CC • Fully isolated digital interface • isoPower® integrated isolated dc-to-dc converter • ±15 kV ESD protection on RS-485 I/O pins • 5 V or 3.3 V operation • Integrated oscillator driver for external transformer • ±15 kV ESD protection on RS-485 I/O pins • Connect up to 256 nodes on one bus • Open- and short-circuit, fail-safe receiver inputs PROFIBUS ADM1486 5 V, high speed, low power, half duplex RS-485 PROFIBUS transceiver ADM2485/ ADM2486 2.5 kV single isolated, high speed, half duplex RS-485 transceiver • 16 Mbps/20 Mbps data rate (ADM2485/ADM2486) • Integrated oscillator driver for external transformer (ADM2485) RS-485 ADM2587E 2.5 kV signal and power isolated, ±15 kV ESD protected, full/half duplex RS-485 transceiver 500 kbps ADM2482E 2.5 kV signal isolated, ESD protected, full/half duplex RS-485 transceiver with transformer driver 16 Mbps ADM2490E 5 kV signal isolated, high speed (16 Mbps), • ±8 kV ESD protection on RS-485 I/O pins ESD protected, full duplex RS-485 • Suitable for 5 V or 3 V operation • • • • 5 V or 3.3 V operation 256 nodes on bus Open- and short-circuit, fail-safe receiver inputs Receiver open-circuit fail-safe design CAN ADM3051 High speed industrial CAN transceiver with bus protection for 24 V systems ADM3052 5 kV rms isolated CAN transceiver with integrated high voltage, bus side linear regulator ADM3053 2.5 kV rms signal and power isolated CAN transceiver with integrated isolated dc-to-dc converter ADM3054 5 kV rms signal isolated high speed CAN transceiver with bus protection • • • • • • • • • • • Physical layer CAN transceiver 5 V operation Fully isolated digital interface Integrated V+ linear regulator Bus side powered by V+ and V– Fully isolated digital interface Signal and power isolation 5 V or 3.3 V operation Fully isolated digital interface 5 V or 3.3 V operation High speed data rate of up to 1 Mbps • High speed data rates up to 1 Mbps • 11 V to 25 V operation on V+ • High speed data rate up to 1 Mbps • High speed data rate up to 1 Mbps • Slop control for reduced EMI • Short-circuit protection on CANH and CANL against shorts to power/ground in 24 V systems RS-232 ADM3251E/ ADM3252E ADM3101E • Fully isolated digital interface • 2.5 kV fully isolated (power and data) RS-232 Isolated single-/dual-channel RS-232 line transceiver driver/receiver • isoPower integrated, isolated dc-to-dc converter • 460 kbps data rate ±15 kV ESD protected, 3.3 V single-channel RS-232 line driver/receiver • 0.1 μF charge pump capacitors • 460 kbps data rate • 15 kV ESD protection on R/N and TOUT pins Wireless ADuCRF101 Precision analog microcontroller ARM Cortex-M3 with RF transceiver ADF7023-J High performance, low power, ISM band FSK/GFSD/MSK/GMSK transceiver IC ADF7242 Low power IEEE 802.15.4/proprietary GFSK/FSK zero-IF 2.4 GHz transceiver IC • 6-channel 12-bit SAR ADC • Low power consumption • Integrated RF transceiver: 862 MHz to 928 MHz and 431 MHz to 464 MHz • • • • Ultralow power Frequency bands: 902 MHz to 958 MHz Data rate supported; 1 kbps to 300 kbps Frequency range (global ISM band) 2400 MHz to 2483.5 MHz • Programmable data rates and modulation • • • • • 32-bit ARM Cortex-M3 processor 128 kB flash, 16 kB SRAM UART, I2C, and SPI serial I/O 64-lead LFCSP Flexible firmware programmable system controller and packet processor • Low power consumption • High sensitivity www.analog.com | 7 Circuits from the Lab Reference Designs Analog Devices Circuits from the Lab® Reference Designs are engineered and tested by our technology and applications experts to ensure both performance and function. Low cost hardware is available to allow for evaluation and rapid prototyping with several development platforms. Thorough documentation and design files are provided to ease application understanding and minimize system integration issues. CN0267 Complete 4 mA to 20 mA Loop-Powered Field Instrument with HART Interface AD5421 L* 1.6𝛀 10𝛍F PRIMARY SENSOR REGOUT 10𝛀 10𝛍F 10𝛍F 10𝛍F 1k𝛀 CS0 SCLK0 MOSI0 MISO0 VREF– GND_SW AVDD 1k𝛀 AIN4 IEXC 0.1𝛍F 1k𝛀 PT100 1k𝛀 CORTEX M3 + SRAM FLASH AVDD_ + REG DMA UART SPI DVDD_ I2C REG CLOCK RESET WATCHDOG 0.01𝛍F AIN3 0.1𝛍F AIN2 ADC1 AGND SOUT SIN P0.5 P0.4 EXPOSED PAD RREF 5.62k𝛀 10ppm AGND DGND AIN7 0.1𝛍F 0.47𝛍F VREF NOTES 1. L* = FERRITE BEAD, 0.3𝛀 @ DC, 1k𝛀 @ 100MHz. 2. THE ADuCM360 EXPOSED PAD IS CONNECTED TO DGND. Features and Benefits • Low power, small footprint • 4 mA to 20 mA loop-powered field instrument • HART compliant interface • Registered by HART Communication Foundation (HFC) For more information on this reference circuit, visit www.analog.com/cn0267. | Field Instrument/Smart Transmitter Design 8 SYNC SCLK WATCHDOG TIMER SDIN SDO LDAC COM 50𝛀 LOOP– CIN DVDD 4.7V LOW LEAKAGE 470𝛀 0.47𝛍F AD5700 1𝛍F VCC 3.8664MHz 0.01𝛍F 1k𝛀 SPI INTERFACE UART INTERFACE 0.068𝛍F HART_OUT 0.22𝛍F XTAL1 REF XTAL2 TXD RXD CD ADC_IP RTS REG_CAP DGND AGND 4700pF TVS 40V LOW LEAKAGE 10𝛍F DAC ADC0 AIN1 1M𝛍 TEMPERATURE SENSOR REFOUT1 REFOUT2 VREF 0.1𝛍F 0.01𝛍F SECONDARY SENSOR 1k𝛀 ADC 10𝛍F IOVDD 0.01𝛍F AIN0 0.1𝛍F LOOP+ 20M𝛀 VREF+ 1k𝛀 L* REGIN VLOOP DVDD DVDD ADuCM360 AVDD VOLTAGE REGULATOR 1𝛍F 1𝛍F 1.2M𝛀 300pF 1.2M𝛀 150k𝛀 150pF L* LOOP– Reference Circuits for Field Instruments Circuit Description Functions Key Features and Benefits Loop-Powered CN0267 Complete 4 mA to 20 mA Loop-Powered Field Instrument with HART Interface • Sensors signal conditioning • Digital processing • Analog communication CN0300 Complete Closed-Loop Precision Analog Microcontroller Thermocouple Measurement System with 4 mA to 20 mA Output • Sensors signal conditioning • Digital processing • Analog communication CN0319 4 mA to 20 mA Loop-Powered Temperature Monitor Using the Integrated PWM On the ADuCM360 Precision Analog Microcontroller • Sensors signal conditioning • Digital processing • Analog communication CN0145 4 mA to 20 mA Loop-Powered Temperature Monitor Using the ADuC7060/ADuC7061 Precision Analog Microcontroller • Sensors signal conditioning • Digital processing • Analog communication CN0289 Flexible, 4 mA to 20 mA, Loop-Powered Pressure Sensor Transmitter with Voltage or Current Drive • Sensors signal conditioning • Analog communication CN0206 Complete Type T Thermocouple Measurement System with Cold Junction Compensation • Sensors signal conditioning CN0009 4 mA to 20 mA Process Control Loop Using the AD5662 DAC • Analog communication CN0314 Precision, Low Cost, Highly Programmable 4 mA to 20 mA Current Loop Using the AD8420 Low Power • Analog communication Instrumentation Amplifier CN0247 12-Bit ,1 MSPS SAR ADC and Driver with Total Power Dissipation Less Than 5 Milliwatts • Sensors signal conditioning • Data acquisition • Complete 4 mA to 20 mA loop-powered field instrument • HART compliant interface • Registered by HART Communication Foundation (HCF) • Low power, small footprint • Complete 4 mA to 20 mA loop-powered field instrument • Thermocouple and RTD measurement • Single chip solution with Cortex processing core • Complete 4 mA to 20 mA loop-powered field instrument • Thermocouple and RTD measurement • 24-bit input, 14-bit output resolution • Complete 4 mA to 20 mA loop-powered field instrument • RTD measurement • 24-bit precision conversion with integrated processor • Complete 4 mA to 20 mA loop-powered field instrument • Optimized for pressure sensors • Analog only design • Thermocouple and thermister measurement • Low power, 500 μA max • Low system noise of 0.2° for T-type thermocouple • Loop-powered 4 mA to 20 mA output • 16-bit resolution • Transmitter or receiver board for 4 mA to 20 mA systems • Gain and scaling jumpers for different input types • Connects directly to ADC driver boards for modular evaluation experience • 12-bit, 1 MSPS data acquisition • Single supply • 5 mW power Nonloop-Powered CN0303 MEMS-Based Vibration Analyzer with Frequency Response Compensation • Sensor signal conditioning CN0270 Complete 4 mA to 20 mA HART Solution • Analog communication CN0064 16-Bit Fully Isolated 4 mA to 20 mA Output Module Using the AD5662 DAC, ADuM1401 Digital Isolator, • Analog communication and External Amplifiers CN0179 Less Than 200 μA, Low Power, 4 mA to 20 mA, Process Control Current Loop • Analog communication CN0313 EMC Compliant RS-485 Transceiver Protection Circuits • Digital communication • • • • • • • • • • • • High-g MEMS-based vibration analyzer Flat response to 22 kHz 70 g, 250 g, and 500 g range 4 mA to 20 mA output HART compliant solution Low power 4 mA to 20 mA output Digitally isolated 16-bit resolution Low power 4 mA to 20 mA output 12-bit, 14-bit, or 16-bit resolution Robust EMC compliant RS-485 transceiver interface • Tested to specific ESD, EFT, and surge levels www.analog.com | 9 Online Tools And Resources To learn more about products, signal chain solutions, and technical expertise offered by Analog Devices to help engineers meet today’s field instrument design challenges, visit processcontrol.analog.com/fieldinstruments. Signal Chain Designer— www.analog.com/signalchaindesigner Signal Chain Designer™ is an advanced selection and design environment that accesses verified product combinations and tested applications circuits, which can be customized or newly created according to your specifications. Analog Filter Wizard™— www.analog.com/filterwizard This online tool simplifies the filter design process with an intuitive user interface and easily accessible tutorials and help. ADIsimDAC—www.analog.com/adisimdac The purpose of the ADIsimDAC™ tool is to assist the user with finding Analog Devices DACs and DAC application circuits. It takes user inputs along with typical parametric data to sort, select, and suggest applicable DACs, system components, and circuits solutions. Multisim ADC Component Evaluator, ADI Edition—www.analog.com/multisim The free downloadable version of NI Multisim™ 12.0 is tailored for circuit design with ADI components in a SPICE simulation environment. ADIsimPower—www.analog.com/adisimpower ADIsimPower™ is a collection of downloadable Excel spreadsheets that produce complete power designs optimized to your design goals. Get a schematic, bill of materials, and performance data customized to your specific needs in minutes. Circuits from the Lab Reference Designs For a complete list of Analog Devices Circuits from the Lab Reference Designs for field instrument designs, visit www.analog.com/circuits. EngineerZone® Online Support Community Find answers to your design questions. Join our engineer community at ez.analog.com. Quality, Reliability, and Product Life Cycle ADI is committed to the establishment and continuous improvement of world class systems and processes aimed at satisfying our customers’ evolving needs. For information about our quality and reliability program, visit www.analog.com/quality. For information about product life cycle, visit www.analog.com/product_status_info. 10 | Field Instrument/Smart Transmitter Design Notes www.analog.com | 11 Analog Devices, Inc. Worldwide Headquarters Analog Devices, Inc. One Technology Way P.O. Box 9106 Norwood, MA 02062-9106 U.S.A. Tel: 781.329.4700 (800.262.5643, U.S.A. only) Fax: 781.461.3113 Analog Devices, Inc. Europe Headquarters Analog Devices, Inc. Wilhelm-Wagenfeld-Str. 6 80807 Munich Germany Tel: 49.89.76903.0 Fax: 49.89.76903.157 Analog Devices, Inc. Japan Headquarters Analog Devices, KK New Pier Takeshiba South Tower Building 1-16-1 Kaigan, Minato-ku, Tokyo, 105-6891 Japan Tel: 813.5402.8200 Fax: 813.5402.1064 Analog Devices, Inc. Asia Pacific Headquarters Analog Devices 5F, Sandhill Plaza 2290 Zuchongzhi Road Zhangjiang Hi-Tech Park Pudong New District Shanghai, China 201203 Tel: 86.21.2320.8000 Fax: 86.21.2320.8222 ©2013 Analog Devices, Inc. All rights reserved. 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