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AD7817ARUZ-REEL7 Folha de dados(PDF) 1 Page - Analog Devices

Nome de Peças AD7817ARUZ-REEL7
Descrição Electrónicos  Dual, Low Power CMOS, Analog Front End with DSP Microcomputer
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Página de início  http://www.analog.com
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Dual, Low Power CMOS, Analog Front End
with DSP Microcomputer
Data Sheet
AD7817/AD7818
Rev. D
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
10-bit ADC with 9 µs conversion time
1 AD7818 and 4 AD7817 single-ended analog input channels
On-chip temperature sensor
Resolution of 0.25°C
±2°C error from −40°C to +85°C
−55°C to +125°C operating range
Wide operating supply range: 2.7 V to 5.5 V
Inherent track-and-hold functionality
On-chip reference (2.5 V ± 1%)
Overtemperature indicator
Automatic power-down at the end of a conversion
Low power operation
4 µW at a throughput rate of 10 SPS
40 µW at a throughput rate of 1 kSPS
400 µW at a throughput rate of 10 kSPS
Flexible serial interface
APPLICATIONS
Data acquisition systems with ambient temperature
monitoring
Industrial process control
Automotive
Battery charging applications
FUNCTIONAL BLOCK DIAGRAMS
AD7817
TEMP
SENSOR
VIN1
VIN2
VIN3
VIN4
MUX
AGND
DGND
VBALANCE
SAMPLING
CAPACITOR
REF
2.5V
REFIN
OTI
DOUT
DIN
SCLK
RD/WR
CS
VDD
BUSY
CONVST
CLOCK
REG
CONTROL
CONTROL
LOGIC
DATA
OUT
A
B
OVERTEMP
REG
CHARGE
REDISTRIBUTION
DAC
A > B
Figure 1. AD7817 Functional Block Diagram
AD7818
TEMP
SENSOR
VIN1
MUX
AGND
VBALANCE
SAMPLING
CAPACITOR
REF
2.5V
OTI
DIN/OUT
SCLK
RD/WR
VDD
CONVST
CLOCK
GENERATOR
CONTROL
REG
CONTROL
LOGIC
DATA
OUT
A
B
OVERTEMP
REG
CHARGE
REDISTRIBUTION
DAC
A > B
Figure 2. AD7818 Functional Block Diagram
GENERAL DESCRIPTION
The AD7817/AD7818 are 10-bit, single- and 4-channel analog-to-
digital converters (ADCs) with an on-chip temperature sensor that
can operate from a single 2.7 V to 5.5 V power supply. Each part
contains a 9 µs successive approximation converter based around
a capacitor digital-to-analog converter (DAC), an on-chip
temperature sensor with an accuracy of ±2°C, an on-chip clock
oscillator, inherent track-and-hold functionality, and an on-chip
reference (2.5 V).
The on-chip temperature sensor of the AD7817/AD7818 can
be accessed via Channel 0. When Channel 0 is selected and a
conversion is initiated, the resulting ADC code at the end of the
conversion gives a measurement of the ambient temperature with a
resolution of ±0.25°C. See the Temperature Measurement section.
The AD7817/AD7818 have a flexible serial interface that allows
easy interfacing to most microcontrollers. The interface is
compatible with the Intel 8051, Motorola SPI and QSPI, and
National Semiconductors MICROWIRE protocols. For more
information, refer to the AD7817 Serial Interface section and
the AD7818 Serial Interface Mode section.
The AD7817 is available in a narrow body, 0.15 inch, 16-lead
SOIC and a 16-lead TSSOP, and the AD7818 comes in an 8-lead
SOIC and an 8-lead MSOP.
PRODUCT HIGHLIGHTS
1. The devices have an on-chip temperature sensor that allows
an accurate measurement of the ambient temperature to be
made. The measurable temperature range is −55°C to +125°C.
2. An overtemperature indicator is implemented by carrying out a
digital comparison of the ADC code for Channel 0 (temperature
sensor) with the contents of the on-chip overtemperature
register. The overtemperature indicator pin goes logic low
when a predetermined temperature is exceeded.
3. The automatic power-down feature enables the AD7817 and
AD7818 to achieve superior power performance at slower
throughput rates, that is, 40 µW at 1 kSPS throughput rate.


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