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AD7173-8BCPZ Arkusz danych(PDF) 1 Page - Analog Devices |
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1 / 64 page Low Power, 8-/16-Channel, 31.25 kSPS, 24-Bit, Highly Integrated Sigma-Delta ADC Data Sheet AD7173-8 FEATURES Low power, 8-/16-channel, highly integrated multiplexed analog-to-digital converter (ADC) Integration Precision analog input buffers and reference input buffers 2.5 V precision reference (3.5 ppm/°C) Cross point multiplexer (enable system diagnostic) 8 full differential or 16 single-ended channels Clock oscillator GPIO and GPO pins with automatic external mux control Fast and flexible output rate: 1.25 SPS to 31.25 kSPS Channel scan data rate: 6.21 kSPS/channel (161 µs settling) Performance specifications 17.5 noise free bits at 31.25 kSPS 24 noise free bits at 1.25 SPS INL: ±3 ppm/FSR 85 dB rejection of 50 Hz and 60 Hz with 50 ms settling Operates with either 3.3 V or5 V supply Single supply 3.3 V or 5 V AVDD1, 2 V to 5 V AVDD2, and 2 V to 5 V IOVDD Optional split supply AVDD1 and AVSS ± 2.5 V or AVDD1 and AVSS ± 1.65 V Current: 1.4 mA 3-/4-wire serial digital interface (Schmitt trigger on SCLK) CRC error checking SPI, QSPI, MICROWIRE, and DSP compatible Package: 40-lead 6 mm × 6 mm LFCSP Temperature range: −40°C to +105°C APPLICATIONS Process control: PLC/DCS modules Voltage, current, temperature, and pressure measurement Flow meters Medical and scientific multichannel instrumentation Seismic instrumentation Chemical analysis instrumentation: chromatography GENERAL DESCRIPTION Fast settling, highly accurate, low power, 8-/16-channel, multiplexed ADC for low bandwidth input signals with integrated input buffers. Integrated precision, 2.5 V, low drift (3.5 ppm/°C), band gap reference and integrated oscillator. Eight flexible setups with configurability for output data rate, digital filter mode, offset/gain error correction, reference selection, buffer enables and more. Sinc5 + sinc1 filter maximizes channel scan rate, and sinc3 filter maximizes resolution and enhanced 50 Hz/60 Hz rejection, with four selectable options to maximize rejection. Integrated diagnostic features, including CRC, register checksum, temperature sensor, crosspoint multiplexer, burnout currents, and GPIOs/GPOs. FUNCTIONAL BLOCK DIAGRAM Figure 1. AVDD1 AVDD ANALOG INPUT BUFFERS REFERENCE INPUT BUFFERS AVSS AVSS PDSW GPIO0 GPIO1 GPIO2 GPIO3 XTAL1 XTAL2/CLKIO DGND REF– REF+ REFOUT AVDD2 REGCAPA AIN0/REF2– AIN1/REF2+ AIN15 AIN16 Σ-Δ ADC 1.8V LDO CROSSPOINT MULTIPLEXER 1.8V LDO INT REF TEMPERATURE SENSOR IOVDD REGCAPD I/O CONTROL SERIAL INTERFACE AND CONTROL DIGITAL FILTER AD7173-8 BUFFERED PRECISION REFERENCE XTAL AND INTERNAL CLOCK OSCILLATOR CIRCUITRY CS SCLK DIN DOUT/RDY SYNC ERROR Rev. 0 Document Feedback Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityisassumedbyAnalogDevicesforitsuse,norforanyinfringementsofpatentsorother rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 ©2013 Analog Devices, Inc. All rights reserved. Technical Support www.analog.com |
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