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AD7175-8BCPZ-RL Arkusz danych(PDF) 1 Page - Analog Devices |
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AD7175-8BCPZ-RL Arkusz danych(HTML) 1 Page - Analog Devices |
1 / 64 page 24-Bit, 8-/16-Channel, 250 kSPS, Sigma- Delta ADC with True Rail-to-Rail Buffers Data Sheet AD7175-8 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 ©2015 Analog Devices, Inc. All rights reserved. Technical Support www.analog.com FEATURES Fast and flexible output rate: 5 SPS to 250 kSPS Channel scan data rate of 50 kSPS/channel (20 µs settling) Performance specifications 17.2 noise free bits at 250 kSPS 20.2 noise free bits at 2.5 kSPS 24 noise free bits at 20 SPS INL: ±1 ppm of FSR 85 dB filter rejection of 50 Hz and 60 Hz with 50 ms settling User configurable input channels 8 fully differential channels or 16 single-ended channels Crosspoint multiplexer On-chip 2.5 V reference (±2 ppm/°C drift) True rail-to-rail analog and reference input buffers Internal or external clock Power supply: AVDD1 − AVSS = 5 V, AVDD2 = IOVDD = 2 V to 5 V (nominal) Split supply with AVDD1/AVSS at ±2.5 V ADC current: 8.4 mA Temperature range: −40°C to +105°C 3- or 4-wire serial digital interface (Schmitt trigger on SCLK) Serial port interface (SPI), QSPI, MICROWIRE, and DSP compatible APPLICATIONS Process control: PLC/DCS modules Temperature and pressure measurement Medical and scientific multichannel instrumentation Chromatography GENERAL DESCRIPTION The AD7175-8 is a low noise, fast settling, multiplexed, 8-/16- channel (fully/pseudo differential) Σ-Δ analog-to-digital converter (ADC) for low bandwidth inputs. It has a maximum channel scan rate of 50 kSPS (20 µs) for fully settled data. The output data rates range from 5 SPS to 250 kSPS. The AD7175-8 integrates key analog and digital signal condition- ing blocks to allow users to configure an individual setup for each analog input channel in use. Each feature can be user selected on a per channel basis. Integrated true rail-to-rail buffers on the analog inputs and external reference inputs provide easy to drive high impedance inputs. The precision 2.5 V low drift (2 ppm/°C) band gap internal reference (with output reference buffer) adds embedded functionality to reduce external component count. The digital filter allows simultaneous 50 Hz and 60 Hz rejection at a 27.27 SPS output data rate. The user can switch between different filter options according to the demands of each channel in the application. The ADC automatically switches through each selected channel. Further digital processing functions include offset and gain calibration registers, configurable on a per channel basis. The device operates with a 5 V AVDD1 − AVSS supply, or with ±2.5 V AVDD1/AVSS, and 2 V to 5 V AVDD2 and IOVDD nominal supplies. The specified operating temperature range is −40°C to +105°C. The AD7175-8 is available in a 40-lead LFCSP package. FUNCTIONAL BLOCK DIAGRAM Figure 1. AVDD1 AVDD ANALOG INPUT BUFFERS REFERENCE INPUT BUFFERS AVSS AVSS PDSW 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 SERIAL INTERFACE AND CONTROL DIGITAL FILTER AD7175-8 BUFFERED PRECISION REFERENCE SCLK DIN CS DOUT/RDY SYNC ERROR XTAL1 XTAL2/CLKIO XTAL AND INTERNAL CLOCK OSCILLATOR CIRCUITRY GPIO0 GPIO1 GPO2 GPO3 I/O AND EXTERNAL MUX CONTROL |
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