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AD7176-2BRUZ Datenblatt(PDF) 1 Page - Analog Devices |
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AD7176-2BRUZ Datenblatt(HTML) 1 Page - Analog Devices |
1 / 68 page 24-Bit, 250 kSPS Sigma-Delta ADC with 20 µs Settling Data Sheet AD7176-2 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 ©2012 Analog Devices, Inc. All rights reserved. Technical Support www.analog.com FEATURES Fast and flexible output rate—5 SPS to 250 kSPS Fast settling time—20 µs Channel scan data rate of 50 kSPS/channel Performance specifications 17 noise free bits at 250 kSPS 20 noise free bits at 2.5 kSPS 22 noise free bits at 5 SPS INL ±2.5 ppm of FSR 85 dB rejection of 50 Hz and 60 Hz with 50 ms settling User-configurable input channels 2 fully differential or 4 pseudo differential Crosspoint multiplexer On-chip 2.5 V reference (drift 2 ppm/°C) Internal oscillator, external crystal, or external clock Power supply Single supply: 5 V AVDD1, 2 V to 5 V AVDD2 and IOVDD Optional split supply: AVDD1 and AVSS ± 2.5 V Current: 7.8 mA Temperature range: −40°C to +105°C 3- or 4-wire serial digital interface (Schmitt trigger on SCLK) CRC error checking 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 AD7176-2 is a fast settling, highly accurate, high resolution, multiplexed Σ-Δ analog-to-digital converter (ADC) for low band- width input signals. Its inputs can be configured as two fully differential or four pseudo differential inputs via the integrated crosspoint multiplexer. An integrated precision, 2.5 V, low drift (2 ppm/°C), band gap internal reference (with an output reference buffer) adds functionality and reduces the external component count. The maximum channel scan data rate is 50 kSPS (with a settling time of 20 µs), resulting in fully settled data of 17 noise free bits. User-selectable output data rates range from 5 SPS to 250 kSPS. The resolution increases at lower speeds. The AD7176-2 offers three key digital filters. The fast settling filter maximizes the channel scan rate. The Sinc3 filter maximizes the resolution for single-channel, low speed applications. For 50 Hz and 60 Hz environments, the AD7176-2 specific filter minimizes the settling times or maximizes the rejection of the line frequency. These enhanced filters enable simultaneous 50 Hz and 60 Hz rejec- tion with a 27 SPS output data rate (with a settling time of 36 ms). System offset and gain errors can be corrected on a per channel basis. This per channel configurability extends to the type of filter and output data rate used for each channel. All switching of the crosspoint multiplexer is controlled by the ADC and can be con- figured to automatically control an external multiplexer via the GPIO pins. The specified operating temperature range is −40°C to +105°C. The AD7176-2 is housed in a 24-lead TSSOP package. FUNCTIONAL BLOCK DIAGRAM Figure 1. AVDD1 AVSS GPIO0 GPIO1 XTAL1 CLKIO/XTAL2 DGND REF– REF+ REFOUT AVDD2 REGCAPA AIN0 AIN1 AIN2 AIN3 AIN4 Σ-Δ ADC 1.8V LDO 1.8V LDO INT REF CROSSPOINT MULTIPLEXER IOVDD REGCAPD I/O CONTROL SERIAL INTERFACE AND CONTROL DIGITAL FILTER AD7176-2 BUFFERED PRECISION REFERENCE XTAL AND INTERNAL CLOCK OSCILLATOR CIRCUITRY CS SCLK DIN DOUT/RDY SYNC/ERROR |
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