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ADS1234 Arkusz danych(PDF) 1 Page - Texas Instruments

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Numer części ADS1234
Szczegółowy opis  24-Bit Analog-to-Digital Converter For Bridge Sensors
Download  40 Pages
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Producent  TI1 [Texas Instruments]
Strona internetowa  http://www.ti.com
Logo TI1 - Texas Instruments

ADS1234 Arkusz danych(HTML) 1 Page - Texas Instruments

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1
FEATURES
DESCRIPTION
APPLICATIONS
Input
Mux
DS ADC
REFP REFN
PGA
Gain=
1,2,64,or128
CAP
DVDD
DGND
AGND
A1/TEMP
(1)
A0
NOTE:(1)A1forADS1234,TEMPforADS1232.
AINP1
AINN1
AINP2
AINN2
AINP3
AINN3
AINP4
AINN4
ADS1234
Only
SCLK
SPEED
DRDY/DOUT
PDWN
GAIN[1:0]
AVDD
CAP
ExternalOscillator
InternalOscillator
CLKIN/XTAL1 XTAL2
ADS1232
ADS1234
SBAS350F – JUNE 2005 – REVISED FEBRUARY 2008
www.ti.com
24-Bit Analog-to-Digital Converter
For Bridge Sensors
2
• Complete Front-End for Bridge Sensors
The ADS1232 and ADS1234 are precision 24-bit
analog-to-digital converters (ADCs). With an onboard,
• Up to 23.5 Effective Bits
low-noise
programmable
gain
amplifier
(PGA),
• Onboard, Low-Noise PGA
precision delta-sigma ADC and internal oscillator, the
• RMS Noise:
ADS1232/4 provide a complete front-end solution for
17nV at 10SPS (PGA = 128)
bridge sensor applications including weigh scales,
44nV at 80SPS (PGA = 128)
strain gauges and pressure sensors.
• 19.2-Bit Noise-Free Resolution at Gain = 64
The input multiplexer accepts either two (ADS1232)
• Over 100dB Simultaneous 50Hz and 60Hz
or four (ADS1234) differential inputs. The ADS1232
also includes an onboard temperature sensor to
Rejection
monitor ambient temperature. The onboard, low-noise
• Flexible Clocking:
PGA has a selectable gain of 1, 2, 64, or 128
Low-Drift Onboard Oscillator (±3%)
supporting a full-scale differential input of ±2.5V,
Optional External Crystal
±1.25V, ±39mV, or ±19.5mV. The delta-sigma ADC
• Selectable Gains of 1, 2, 64, and 128
has 23.5-bit effective resolution and is comprised of a
3rd-order modulator and 4th-order digital filter. Two
• Easy Ratiometric Measurements–
data rates are supported: 10SPS (with both 50Hz and
External Voltage Reference up to 5V
60Hz rejection) and 80SPS. The ADS1232/4 can be
• Selectable 10SPS or 80SPS Data Rates
clocked externally using an oscillator or a crystal.
• Two-Channel Differential Input with Built-In
There is also an internal oscillator available that
Temperature Sensor (ADS1232)
requires no external components. Offset calibration is
performed on-demand and the ADS1232/4 can be
• Four-Channel Differential Input (ADS1234)
put in a low-power standby mode or shut off
• Simple Serial Digital Interface
completely in power-down mode. All of the features of
• Supply Range: 2.7V to 5.3V
the
ADS1232/4
are
operated
through
simple
pin-driven control. There are no digital registers to
• –40°C to +105°C Temperature Range
program in order to simplify software development.
Data
are
output
over
an
easily-isolated
serial
interface that connects directly to the MSP430 and
• Weigh Scales
other microcontrollers.
• Strain Gauges
The ADS1232 is available in a TSSOP-24 package
• Pressure Sensors
and the ADS1234 is in a TSSOP-28. Both are fully
• Industrial Process Control
specified from -40
°C to +105°C.
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
All trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Copyright © 2005–2008, 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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