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AD7175-8 Arkusz danych(PDF) 1 Page - Analog Devices

Numer części AD7175-8
Szczegółowy opis  24-Bit, 8-/16-Channel, 250 kSPS, Sigma- Delta ADC with True Rail-to-Rail Buffers
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AD7175-8 Arkusz danych(HTML) 1 Page - Analog Devices

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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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