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7314 PDF даташит

Спецификация 7314 изготовлена ​​​​«Analog Devices» и имеет функцию, называемую «Low-Voltage/ 10-Bit Digital Temperature Sensor in 8-Lead uSOIC».

Детали детали

Номер произв 7314
Описание Low-Voltage/ 10-Bit Digital Temperature Sensor in 8-Lead uSOIC
Производители Analog Devices
логотип Analog Devices логотип 

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7314 Даташит, Описание, Даташиты
a Low-Voltage, 10-Bit Digital Temperature
Sensor in 8-Lead SOIC
AD7314
FEATURES
10-Bit Temperature-to-Digital Converter
–35؇C to +85؇C Operating Temperature Range
؎2؇C Accuracy
SPI™- and DSP-Compatible Serial Interface
Shutdown Mode
Space-Saving SOIC Package
APPLICATIONS
Hard Disk Drives
Personal Computers
Electronic Test Equipment
Office Equipment
Domestic Appliances
Process Control
Mobile Phones
FUNCTIONAL BLOCK DIAGRAM
BANDGAP
TEMPERATURE
SENSOR
GND
AD7314
10-BIT
ANALOG/DIGITAL
CONVERTER
TEMPERATURE
VALUE
REGISTER
SERIAL
BUS
INTERFACE
ID
VDD
CE
SCLK
SDI
SDO
GENERAL DESCRIPTION
The AD7314 is a complete temperature monitoring system in
an 8-lead µSOIC package. It contains a bandgap temperature
sensor and 10-bit ADC to monitor and digitize the temperature
reading to a resolution of 0.25°C.
The AD7314 has a flexible serial interface that allows easy
interfacing to most microcontrollers. The interface is compat-
ible with SPI, QSPI and MICROWIRE™ protocol and is also
compatible with DSPs. The part features a standby mode that
is controlled via the serial interface.
The AD7314’s low supply current and SPI-compatible interface,
make it ideal for a variety of applications, including personal
computers, office equipment, and domestic appliances.
PRODUCT HIGHLIGHTS
1. The AD7314 has an on-chip temperature sensor that allows
an accurate measurement of the ambient temperature. The
measurable temperature range is –35°C to +85°C, with a
± 2°C temperature accuracy.
2. Supply voltage of 2.65 V to 2.9 V.
3. Space-saving 8-lead µSOIC package.
4. 10-bit temperature reading to 0.25°C resolution.
5. The AD7314 features a standby mode that reduces the
current consumption to 1 µA max.
SPI is a trademark of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor Corporation.
REV. 0
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties that
may result from its use. No license is granted by implication or otherwise
under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 2001









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7314 Даташит, Описание, Даташиты
AD7314–SPECIFICATIONS1
(TA = TMIN to TMAX, VDD = 2.65 V to 2.9 V, unless otherwise noted.)
Parameter
Min Typ Max Unit Test Conditions/Comments
TEMPERATURE SENSOR AND ADC
Accuracy
Resolution
Update Rate, tR
Temperature Conversion Time
± 2.0 °C
10 Bits
400 µs
25 µs
TA = –35°C to +85°C.
SUPPLIES
Supply Voltage
Supply Current
Normal Mode (Inactive)
Normal Mode (Active)
Shutdown Mode
Power Dissipation
Power Dissipation
1 sps
10 sps
100 sps
2.65
250
1
860
2.9
300
1
V
µA
mA
µA
µW
3 µW
3.3 µW
6 µW
For Specified Performance
Part not Converting
Part Converting
VDD = 2.65 V. Using Normal Mode
(Auto Conversion)
VDD = 2.65 V. Using Shutdown Mode
DIGITAL INPUT
Input High Voltage, VIH
Input Low Voltage, VIL
Input Current, IIN
Input Capacitance, CIN
1.85
DIGITAL OUTPUT
Output High Voltage, VOH
Output Low Voltage, VOL
Output Capacitance, COUT
2.4
NOTES
1All specifications apply for –35°C to +85°C unless otherwise noted.
Specifications subject to change without notice.
V
0.53 V
± 1 µA
10 pF
V
0.4 V
50 pF
VDD = 2.65 V to 2.9 V
VDD = 2.65 V to 2.9 V
VIN = 0 V to VDD
All Digital Inputs
ISOURCE = ISINK = 200 µA
IOL = 200 µA
TIMING CHARACTERISTICS 1,2 (TA3 = TMIN to TMAX, VDD = 2.65 V to 2.9 V, unless otherwise noted. See Figure 1.)
Parameter
Limit
Unit
Comments
t1
0
ns min
CE to SCLK Setup Time
t2
50
ns min
SCLK High Pulsewidth
t3
50
ns min
SCLK Low Pulsewidth
t44
35
ns max
Data Access Time After SCLK Rising Edge
t5
20
ns min
Data Setup Time Prior to SCLK Falling Edge
t6
0
ns min
Data Hold Time After SCLK Falling Edge
t7
0
ns min
CE to SCLK Hold Time
t84
40
ns max
CE to SDO High Impedance
NOTES
1Guaranteed by design and characterization, not production tested.
2All input signals are specified with tr = tf = 5 ns (10% to 90% of VDD) and timed from a voltage level of 1.6 V.
3All specifications apply for –35°C to +85°C unless otherwise noted.
4Measured with the load circuit of Figure 2.
Specifications subject to change without notice.
–2– REV. 0









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7314 Даташит, Описание, Даташиты
AD7314
CE
SCLK
SDO
SDI
t1
t5
t2
t4
t3
t6
Figure 1. Timing Diagram
t7
t8
ABSOLUTE MAXIMUM RATINGS1
VDD to GND . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to +7 V
Digital Input Voltage to GND . . . . . . . –0.3 V to VDD + 0.3 V
Digital Output Voltage to GND . . . . . –0.3 V to VDD + 0.3 V
Operating Temperature Range . . . . . . . . . . . –35°C to +85°C
Storage Temperature Range . . . . . . . . . . . . –65°C to +150°C
Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . . 150°C
SOT-23, Power Dissipation . . . . . . . . . . . . . . . . . . . . 450 mW
θJA Thermal Impedance . . . . . . . . . . . . . . . . . . . . 240°C/W
Lead Temperature, Soldering
Vapor Phase (60 sec) . . . . . . . . . . . . . . . . . . . . . . 215°C
Infrared (15 sec) . . . . . . . . . . . . . . . . . . . . . . . . . . 220°C
µSOIC Package, Power Dissipation . . . . . . . . . . . . . . 450 mW
θJA Thermal Impedance . . . . . . . . . . . . . . . . . . . . 206°C/W
Lead Temperature, Soldering
Vapor Phase (60 sec) . . . . . . . . . . . . . . . . . . . . . . 215°C
Infrared (15 sec) . . . . . . . . . . . . . . . . . . . . . . . . . . 220°C
Latch-Up for ID Pin2 . . . . . . . . . . . . . . . . . . . . . . . . –70 mA
Latch-Up for All Other Pins . . . . . . . . . . . . . . . . . –110 mA
NOTES
1Stresses above those listed under Absolute Maximum Ratings may cause perma-
nent damage to the device. This is a stress rating only; functional operation of the
device at these or any other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute maximum rating
conditions for extended periods may affect device reliability.
2Correct usage of the ID pin will prevent any latch-up occurring. We recommend
that in an application the ID pin should be either tied via a 100 kresistor to VDD
or left open circuit. If the application complies with our recommendation, the ID
pin will never see –70 mA.
200A
IOL
TO
OUTPUT
PIN
CL
50pF
1.6V
200A
IOH
Figure 2. Load Circuit for Data Access Time and Bus
Relinquish Time
Model
AD7314ARM
Temperature
Range
–35°C to +85°C
ORDERING GUIDE
Temperature
Error
± 2°C
Package
Description
8-Lead µSOIC
Package
Option
RM-8
Branding
Information
CKA
CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily
accumulate on the human body and test equipment and can discharge without detection. Although
the AD7314 features proprietary ESD protection circuitry, permanent damage may occur on
devices subjected to high-energy electrostatic discharges. Therefore, proper ESD precautions are
recommended to avoid performance degradation or loss of functionality.
WARNING!
ESD SENSITIVE DEVICE
REV. 0
–3–










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