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ADS1248IPWR Arkusz danych(PDF) 1 Page - Texas Instruments

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Numer części ADS1248IPWR
Szczegółowy opis  24-Bit Analog-to-Digital Converters for Temperature Sensors
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Producent  TI [Texas Instruments]
Strona internetowa  http://www.ti.com
Logo TI - Texas Instruments

ADS1248IPWR Arkusz danych(HTML) 1 Page - Texas Instruments

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ADS1246
ADS1247
ADS1248
1
FEATURES
DESCRIPTION
APPLICATIONS
Input
Mux
3rdOrder
DS
Modulator
REFP
REFN
PGA
Burnout
Detect
Burnout
Detect
DVDD
DGND
ADS1246
AVSS
AIN0
AIN1
SCLK
DIN
DRDY
DOUT/DRDY
CS
START
RESET
AVDD
InternalOscillator
Adjustable
Digital
Filter
Serial
Interface
and
Control
CLK
Input
Mux
3rdOrder
DS
Modulator
REFP1 REFN1 VREFOUT VREFCOM
REFP0/
GPIO0
REFN0/
GPIO1
Burnout
Detect
Burnout
Detect
DVDD
DGND
IEXC1
AVSS
AIN0/IEXC
AIN1/IEXC
AIN2/IEXC/GPIO2
AIN3/IEXC/GPIO3
AIN4/IEXC/GPIO4
AIN5/IEXC/GPIO5
AIN6/IEXC/GPIO6
AIN7/IEXC/GPIO7
ADS1248 Only
SCLK
DIN
DRDY
DOUT/DRDY
CS
START
RESET
AVDD
IEXC2
InternalOscillator
Voltage
Reference
Serial
Interface
and
Control
V
BIAS
GPIO
CLK
ADS1248 Only
ADS1247
ADS1248
PGA
System
Monitor
Adjustable
Digital
Filter
Dual
Current
DACs
VREFMux
ADS1248 Only
V
BIAS
ADS1246
ADS1247
ADS1248
www.ti.com .................................................................................................................................................. SBAS426C – AUGUST 2008 – REVISED AUGUST 2009
24-Bit Analog-to-Digital Converters for Temperature Sensors
23
• 24 Bits, No Missing Codes
The
ADS1246,
ADS1247,
and
ADS1248
are
highly-integrated, precision, 24-bit analog-to-digital
• Data Output Rates Up to 2kSPS
converters (ADCs). The ADS1246/7/8 feature an
• Single-Cycle Settling for All Data Rates
onboard, low-noise, programmable gain amplifier
• Simultaneous 50/60Hz Rejection at 20SPS
(PGA),
a
precision
delta-sigma
ADC
with
a
• 4 Differential/7 Single-Ended Inputs (ADS1248)
single-cycle settling digital filter, and an internal
oscillator. The ADS1247 and ADS1248 also provide a
• 2 Differential/3 Single-Ended Inputs (ADS1247)
built-in, very low drift voltage reference with 10mA
• Low-Noise PGA: 48nV at PGA = 128
output capacity, and two matched programmable
• Matched Current Source DACs
current
digital-to-analog
converters
(DACs).
The
ADS1246/7/8 provide a complete front-end solution
• Very Low Drift Internal Voltage Reference:
for temperature/bridge sensor applications including
10ppm/°C (max)
thermal couples, thermistors, RTDs, and strain-gauge
• Sensor Burnout Detection
applications.
• 4/8 General-Purpose I/Os (ADS1247/48)
An input multiplexer supports four differential inputs
• Internal Temperature Sensor
for the ADS1248, two for the ADS1247, and one for
the ADS1246. In addition, the multiplexer has a
• Power Supply and V
REF Monitoring
sensor
burnout
detect,
voltage
bias
for
(ADS1247/48)
thermocouples,
system
monitoring,
and
• Self and System Calibration
general-purpose
digital
I/Os
(ADS1247
and
• SPI™-Compatible Serial Interface
ADS1248). The onboard, low-noise PGA provides
selectable gains of 1 to 128. The delta-sigma
• Analog Supply Unipolar (+2.7V to
modulator and adjustable digital filter settle in only
+5.25V)/Bipolar (±2.5V) Operation
one cycle, for fast channel cycling when using the
• Digital Supply: +2.7V to +5.25V
input multiplexer, and support data rates up to
• Operating Temperature –40°C to +125°C
2kSPS. For data rates of 20SPS or less, both 50Hz
and 60Hz interference are rejected by the filter.
The ADS1246 is offered in a small TSSOP-16
• Temperature Measurement
package, the ADS1247 is available in a TSSOP-20
RTDs, Thermocouples, and Thermistors
package, and the ADS1248 in a TSSOP-28 package.
All three devices are rated over the extended
• Pressure Measurement
specified temperature range of –40°C to +105°C.
• Industrial Process Control
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
2
SPI is a trademark of Motorola, Inc.
3
All other trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Copyright © 2008–2009, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.


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