ADS1146
ADS1147
ADS1148
www.ti.com
SBAS453C –JULY 2009–REVISED APRIL 2010
16-Bit Analog-to-Digital Converters for Temperature Sensors
Check for Samples: ADS1146, ADS1147, ADS1148
1
FEATURES
DESCRIPTION
23
•
16 Bits, No Missing Codes
The ADS1146, ADS1147, and ADS1148 are
highly-integrated, precision, 16-bit analog-to-digital
converters (ADCs). The ADS1146/7/8 feature an
onboard, low-noise, programmable gain amplifier
•
Data Output Rates Up to 2kSPS
•
•
•
•
•
•
•
•
•
•
Single-Cycle Settling for All Data Rates
Simultaneous 50/60Hz Rejection at 20SPS
4 Differential/7 Single-Ended Inputs (ADS1148)
2 Differential/3 Single-Ended Inputs (ADS1147)
Matched Current Source DACs
(PGA),
a
precision delta-sigma ADC with
a
single-cycle settling digital filter, and an internal
oscillator. The ADS1147 and ADS1148 also provide a
built-in voltage reference with 10mA output capacity,
and
two
matched
programmable
(DACs).
current
The
Internal Voltage Reference
digital-to-analog
converters
ADS1146/7/8 provide a complete front-end solution
for temperature sensor applications including thermal
couples, thermistors, and resistance temperature
detectors (RTDs).
Sensor Burnout Detection
4/8 General-Purpose I/Os (ADS1147/8)
Internal Temperature Sensor
Power Supply and VREF Monitoring
(ADS1147/8)
An input multiplexer supports four differential inputs
for the ADS1148, two for the ADS1147, and one for
the ADS1146. In addition, the multiplexer has a
•
•
•
Self and System Calibration
sensor
thermocouples,
burnout
detect,
system
voltage
monitoring,
bias
for
and
SPI™-Compatible Serial Interface
Analog Supply Operation:
+2.7V to +5.25V Unipolar, ±2.5V Bipolar
general-purpose digital I/Os (ADS1147 and
ADS1148). The onboard, low-noise PGA provides
selectable gains of 1 to 128. The delta-sigma
modulator and adjustable digital filter settle in only
one cycle, for fast channel cycling when using the
input multiplexer, and support data rates up to
2kSPS. For data rates of 20SPS or less, both 50Hz
and 60Hz interference are rejected by the filter.
•
•
Digital Supply: +2.7V to +5.25V
Operating Temperature –40°C to +125°C
APPLICATIONS
•
Temperature Measurement
–
RTDs, Thermocouples, and Thermistors
The ADS1146 is offered in a small TSSOP-16
package, the ADS1147 is available in a TSSOP-20
package, and the ADS1148 in a TSSOP-28 package.
All three devices operate over the extended specified
temperature range of –40°C to +105°C.
•
•
Pressure Measurement
Industrial Process Control
ADS1148 Only
REFP0/ REFN0/
AVDD
REFP REFN
DVDD
AVDD
GPIO0 GPIO1 REFP1 REFN1 VREFOUT VREFCOM
DVDD
Burnout
Detect
Burnout
Detect
ADS1147
ADS1148
ADS1146
Voltage
VREF Mux
VBIAS
VBIAS
Reference
GPIO
SCLK
SCLK
AIN0/IEXC
AIN1/IEXC
System
Monitor
DIN
DIN
Serial
Interface
and
Serial
Interface
and
DRDY
DOUT/DRDY
CS
DRDY
DOUT/DRDY
CS
AIN2/IEXC/GPIO2
AIN3/IEXC/GPIO3
3rd Order
DS
Adjustable
Digital
Filter
3rd Order
DS
Adjustable
Digital
Filter
AIN0
AIN1
Input
Mux
Input
Mux
PGA
PGA
Modulator
Modulator
AIN4/IEXC/GPIO4
AIN5/IEXC/GPIO5
Control
Control
START
RESET
START
RESET
Dual
Current
DACs
AIN6/IEXC/GPIO6
AIN7/IEXC/GPIO7
Internal Oscillator
Internal Oscillator
ADS1148 Only
Burnout
Detect
Burnout
Detect
AVSS
CLK
DGND
AVSS IEXC1 IEXC2
CLK
DGND
ADS1148 Only
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
3
SPI is a trademark of Motorola, Inc.
All other trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2009–2010, Texas Instruments Incorporated
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