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AD7981 датащи(PDF) 1 Page - Analog Devices

номер детали AD7981
подробное описание детали  High Temperature, 16-Bit, 600 kSPS PulSAR ADC
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производитель  AD [Analog Devices]
домашняя страница  http://www.analog.com
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High Temperature, 16-Bit,
600 kSPS PulSAR® ADC
Data Sheet
AD7981
FEATURES
Extreme high temperature operation
Specified temperature range: −55°C to +175°C
High performance
16-bit resolution with no missing codes
600 kSPS throughput with no latency/pipeline delay
SNR: 91 dB typical at 1 kHz input frequency
THD: −102 dB typical at 1 kHz input frequency
INL: ±2.0 LSB maximum, DNL: ±0.9 LSB maximum
Low power dissipation
2.25 mW typical at 600 kSPS (VDD only)
4.65 mW typical at 600 kSPS (total)
70 µW typical at 10 kSPS
Small footprint
10-lead, 3 mm × 5 mm, monometallic wire bonding MSOP
Pseudo differential analog input range
0 V to VREF with VREF between 2.4 V and 5.1 V
Easy to use
Single-supply 2.5 V operation with 1.8 V/2.5 V/3 V/5 V logic
interface
SPI-/QSPI-/MICROWIRE-/DSP-compatible digital interface
Daisy-chain multiple ADCs and busy indicator
APPLICATIONS
Downhole drilling and instrumentation
Avionics
Heavy industrial
High temperature environments
TYPICAL APPLICATION CIRCUIT
AD7981
REF
GND
VDD
IN+
IN–
VIO
SDI
SCK
SDO
CNV
1.8V TO 5.0V
3- OR 4-WIRE INTERFACE
(SPI, DAISY CHAIN, CS)
2.5V to 5.0V
2.5V
0V TO VREF
Figure 1.
GENERAL DESCRIPTION
The AD79811 is a 16-bit, successive approximation, analog-to-
digital converter (ADC) designed for high temperature operation.
The AD7981 is capable of sample rates up to 600 kSPS while
maintaining low power consumption from a single power supply,
VDD. It is a fast throughput, high accuracy, high temperature,
successive approximation register (SAR) ADC and packaged in
a small form factor with a versatile serial port interface (SPI).
On the CNV rising edge, the AD7981 samples an analog input,
IN+, between 0 V and REF with respect to a ground sense, IN−.
The reference voltage, REF, is applied externally and can be set
independent of the supply voltage, VDD. The device power
scales linearly with throughput.
The SPI-compatible serial interface also features the ability,
using the SDI input, to daisy-chain several ADCs on a single,
3-wire bus and provides an optional busy indicator. It is compatible
with 1.8 V, 2.5 V, 3 V, or 5 V logic, using the separate supply VIO.
For space constrained applications, the AD7981 is available in a
10-lead mini small outline package (MSOP) with operation
specified from −55°C to +175°C. This package is designed for
robustness at extreme temperatures, including monometallic
wire bonding, and is qualified for up to 1000 hours of operation
at the maximum temperature rating.
The AD7981 is a member of a growing series of high temperature
qualified products offered by Analog Devices, Inc. For a complete
selection of available high temperature products, see the high
temperature product list and qualification data available at
www.analog.com/hightemp.
1
Protected by U.S. Patent 6,703,961.
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
©2014 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com


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