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AD7981 Datasheet Download - Analog Devices

Номер произв AD7981
Описание 600 kSPS PulSAR ADC
Производители Analog Devices
логотип Analog Devices логотип 



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AD7981 Даташит, Описание, Даташиты
Data Sheet
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
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,
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
responsibilityisassumedbyAnalogDevices for itsuse,nor foranyinfringementsofpatentsor other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
High Temperature, 16-Bit,
600 kSPS PulSAR® ADC
AD7981
TYPICAL APPLICATION CIRCUIT
2.5V to 5.0V 2.5V
0V TO VREF
REF VDD VIO
IN+ SDI
AD7981 SCK
IN– SDO
GND
CNV
1.8V TO 5.0V
3- OR 4-WIRE INTERFACE
(SPI, DAISY CHAIN, CS)
Figure 1.
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.
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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AD7981 Даташит, Описание, Даташиты
AD7981
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
Typical Application Circuit ............................................................. 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Timing Specifications .................................................................. 5
Absolute Maximum Ratings............................................................ 6
ESD Caution.................................................................................. 6
Pin Configuration and Function Descriptions............................. 7
Typical Performance Characteristics ............................................. 8
Terminology .................................................................................... 12
Theory of Operation ...................................................................... 13
Circuit Information.................................................................... 13
Converter Operation.................................................................. 13
Typical Connection Diagram.................................................... 14
REVISION HISTORY
10/14—Revision 0: Initial Version
Data Sheet
Analog Input ............................................................................... 15
Driver Amplifier Choice ........................................................... 15
Voltage Reference Input ............................................................ 16
Power Supply............................................................................... 16
Digital Interface .......................................................................... 16
CS Mode, 3-Wire Without Busy Indicator ............................. 17
CS Mode, 3-Wire with Busy Indicator .................................... 18
CS Mode, 4-Wire Without Busy Indicator ............................. 19
CS Mode, 4-Wire with Busy Indicator .................................... 20
Chain Mode Without Busy Indicator ...................................... 21
Chain Mode with Busy Indicator............................................. 22
Applications Information .............................................................. 23
Printed Circuit Board (PCB) Layout ....................................... 24
Outline Dimensions ....................................................................... 25
Ordering Guide .......................................................................... 25
Rev. 0 | Page 2 of 25







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AD7981 Даташит, Описание, Даташиты
Data Sheet
AD7981
SPECIFICATIONS
VDD = 2.5 V, VIO = 2.3 V to 5.5 V, VREF = 5 V, TA = −55°C to +175°C, unless otherwise noted.
Table 1.
Parameter
RESOLUTION
ANALOG INPUT
Voltage Range
Absolute Input Voltage
Analog Input Common-Mode Rejection Ratio (CMRR)
Leakage Current at 25°C
Input Impedance
ACCURACY
No Missing Codes
Differential Nonlinearity
Integral Nonlinearity
Transition Noise
Gain Error2
Gain Error Temperature Drift
Zero Error2
Zero Temperature Drift
Power Supply Sensitivity
THROUGHPUT
Conversion Rate
Transient Response
AC ACCURACY3
Dynamic Range
Oversampled Dynamic Range4
Signal-to-Noise Ratio (SNR)
Spurious-Free Dynamic Range (SFDR)
Total Harmonic Distortion (THD)
Signal-to-Noise-and-Distortion (SINAD)
Test Conditions/Comments
IN+ − IN−
IN+
IN−
fIN = 100 kHz
Acquisition phase
VREF = 5 V
VREF = 2.5 V
VREF = 5 V
VREF = 2.5 V
VREF = 5 V
VREF = 2.5 V
TMIN to TMAX
TMIN to TMAX
VDD = 2.5 V ± 5%
Full-scale step
VREF = 5 V
VREF = 2.5 V
OSR = 256
fIN = 1 kHz, VREF = 5 V
fIN = 1 kHz, VREF = 2.5 V
fIN = 1 kHz
fIN = 1 kHz
fIN = 1 kHz, VREF = 5 V
fIN = 1 kHz, VREF = 2.5 V
Min Typ
16
Max
Unit
Bits
0 VREF
−0.1
VREF + 0.1
−0.1 +0.1
60
1
See the Analog Input section
V
V
V
dB
nA
16
−0.9 ±0.4 +0.9
±0.5
−2.0 ±0.7 +2.0
±0.6
0.75
1.2
±2
±0.35
−1 ±0.08 +1
0.45
±0.1
Bits
LSB1
LSB1
LSB1
LSB1
LSB1
LSB1
LSB1
ppm/°C
mV
ppm/°C
LSB1
0 600 kSPS
290 ns
92
87
110
89 91
86
104
−102
90.5
85.5
dB
dB
dB
dB
dB
dB
dB
dB
dB
1 LSB means least significant bit. With the 5 V input range, 1 LSB is 76.3 µV.
2 See the Terminology section. These specifications include full temperature range variation, but not the error contribution from the external reference.
3 All ac accuracy specifications in dB are referred to an input full-scale range (FSR). Tested with an input signal at 0.5 dB below full scale, unless otherwise specified.
4 The oversampled dynamic range is the ratio of the peak signal power to the noise power (for a small input) measured in the ADC output FFT from dc up to fS/(2 × OSR),
where fS is the ADC sample rate and OSR is the oversampling ratio.
Rev. 0 | Page 3 of 25










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