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AD7418ARUZ Datasheet(PDF) 1 Page - Analog Devices

Part No. AD7418ARUZ
Description  10-Bit Digital Temperature Sensor (AD7416) and Single/Four-Channel ADC (AD7417/AD7418)
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Maker  AD [Analog Devices]
Homepage  http://www.analog.com
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AD7418ARUZ Datasheet(HTML) 1 Page - Analog Devices

 
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REV. G
AD7416/AD7417/AD7418
10-Bit Digital Temperature Sensor (AD7416) and
Four Single-Channel ADCs (AD7417/AD7418)
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. Trademarks and
registered trademarks are the property of their respective owners.
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
© 2004 Analog Devices, Inc. All rights reserved.
FEATURES
10-Bit ADC with 15
s and 30
s Conversion Times
Single and Four 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
I
2C® Compatible Serial Interface
Selectable Serial Bus Address Allows Connection of up
to Eight AD7416/AD7417s 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
FUNCTIONAL BLOCK DIAGRAMS
VDD
OTI
GND
SDA
SCL
FAULT
QUEUE
COUNTER
SETPOINT
COMPARATOR
TOTI SETPOINT
REGISTER
THYST SETPOINT
REGISTER
TEMPERATURE
VALUE
REGISTER
A0
A1
A2
CONFIGURATION
REGISTER
SERIAL BUS
INTERFACE
BAND GAP
TEMPERATURE
SENSOR
10-BIT
ANALOG-DIGITAL
CONVERTER
ADDRESS
POINTER
REGISTER
AD7416
CONTROL
LOGIC
A > B
REFIN
VDD
OTI
SCL
SDA
A2
A1
A0
CONVST
AIN1
AIN2
AIN3
AIN4
TEMP
SENSOR
SAMPLING
CAPACITOR
VBALANCE
CLOCK
A
B
REF
2.5V
CHARGE
DISTRIBUTION
DAC
I2C
INTERFACE
MUX
OVERTEMP REG
NC
NC GND
DATA OUT
NC = NO CONNECT
AD7417
CONTROL
LOGIC
A > B
VDD
OTI
SCL
SDA
AIN1
SAMPLING
CAPACITOR
VBALANCE
CLOCK
A
B
I2C
INTERFACE
MUX
OVERTEMP REG
GND
DATA OUT
TEMP
SENSOR
REFIN
CONVST
REF
2.5V
CHARGE
DISTRIBUTION
DAC
AD7418
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 oscilla-
tor, 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 multi-
plexer 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 tem-
perature limits, and an open-drain overtemperature indicator
(OTI) output is provided, which becomes active when a pro-
grammed 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.
(continued on page 7)


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