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AD7417BR-REEL7 Datasheet(PDF) 1 Page - Analog Devices

Part # AD7417BR-REEL7
Description  10-Bit Digital Temperature Sensor (AD7416) and Four Single-Channel ADCs
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD7417BR-REEL7 Datasheet(HTML) 1 Page - Analog Devices

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10-Bit Digital Temperature Sensor
(AD7416) and Four Single-Channel ADCs
AD7416/AD7417/AD7418
Rev. I
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringements of patents or other
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
www.analog.com
Fax: 781.461.3113
©1998–2010 Analog Devices, Inc. All rights reserved.
FEATURES
10-bit ADC with 15 μs and 30 μs conversion times
Single and 4 single-ended analog input channels
On-chip temperature sensor: −40°C to +125°C
On-chip track-and-hold
Overtemperature indicator
Automatic power-down at the end of a conversion
Wide operating supply range: 2.7 V to 5.5 V
I2C-compatible serial interface
Selectable serial bus address allows connection of up to 8
AD7416/AD7417 devices to a single bus
AD7416 is a superior replacement for LM75
APPLICATIONS
Data acquisition with ambient temperature monitoring
Industrial process control
Automotive
Battery-charging applications
Personal computers
GENERAL DESCRIPTION
The AD7417 and AD7418 are 10-bit, 4-channel and single-channel
ADCs with an on-chip temperature sensor that can operate from a
single 2.7 V to 5.5 V power supply. The devices contain a 15 μs
successive approximation converter, a 5-channel multiplexer, a
temperature sensor, a clock oscillator, a track-and-hold, and a
reference (2.5 V). The AD7416 is a temperature-monitoring only
device in an 8-lead package.
The temperature sensor on the parts can be accessed via multip-
lexer 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 (±1°C @ 25°C).
On-chip registers can be programmed with high and low tempera-
ture limits, and an open-drain overtemperature indicator (OTI)
output is provided, which becomes active when a programmed
limit is exceeded.
A configuration register allows programming of the sense of the
OTI output (active high or active low) and its operating mode
(comparator or interrupt). A programmable fault queue counter
allows the number of out-of-limit measurements that must
occur before triggering the OTI output to be set to prevent
spurious triggering of the OTI output in noisy environments.
FUNCTIONAL BLOCK DIAGRAMS
SETPOINT
COMPARATOR
10-BIT
ANALOG-TO-DIGITAL
CONVERTER
AD7416
BAND GAP
TEMPERATURE
SENSOR
ADDRESS
POINTER
REGISTER
TEMPERATURE
VALUE
REGISTER
CONFIGURATION
REGISTER
SERIAL BUS
INTERFACE
FAULT
QUEUE
COUNTER
TOTI SETPOINT
REGISTER
THYST SETPOINT
REGISTER
7
2
1
4
3
8
6
5
A0
GND
OTI
VDD
SDA
SCL
A1
A2
Figure 1. AD7416
AD7417
13
2
3
4
5
12
11
A0
1
NC
NC = NO CONNECT
16
NC
6
GND
15
CONVST
TEMP
SENSOR
MUX
REF
2.5V
SAMPLING
CAPACITOR
CLOCK
TOTI SETPOINT
REGISTER
A > B
B
DATA OUT
I2C
INTERFACE
A
CONTROL
LOGIC
AIN1
8
AIN2
9
AIN3
10
AIN4
VBALANCE
OTI
REFIN
14
VDD
SCL
SDA
A1
A2
7
CHARGE
DISTRIBUTION
DAC
Figure 2. AD7417
AD7418
1
2
3
6
4
GND
8
CONVST
TEMP
SENSOR
MUX
REF
2.5V
SAMPLING
CAPACITOR
CLOCK
TOTI SETPOINT
REGISTER
A > B
B
DATA OUT
I2C
INTERFACE
A
CONTROL
LOGIC
AIN
VBALANCE
OTI
REFIN
7
VDD
SCL
SDA
5
CHARGE
DISTRIBUTION
DAC
Figure 3. AD7418


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