ADS1234 Converter Datasheet

ADS1234 Datasheet, PDF, Equivalent


Part Number

ADS1234

Description

24-Bit Analog-to-Digital Converter

Manufacture

etcTI

Total Page 30 Pages
Datasheet
Download ADS1234 Datasheet


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

ADS1234
ADS1232
ADS1234
SBAS350F – JUNE 2005 – REVISED FEBRUARY 2008
www.ti.com
This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with
appropriate precautions. Failure to observe proper handling and installation procedures can cause damage.
ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more
susceptible to damage because very small parametric changes could cause the device not to meet its published specifications.
ORDERING INFORMATION
For the most current package and ordering information, see the Package Option Addendum at the end of this
data sheet, or see the TI website at www.ti.com.
ABSOLUTE MAXIMUM RATINGS
over operating free-air temperature range (unless otherwise noted)(1)
AVDD to AGND
DVDD to DGND
AGND to DGND
Input Current
Input Current
Analog Input Voltage to AGND
Digital Input Voltage to DGND
Maximum Junction Temperature
Operating Temperature Range
Storage Temperature Range
ADS1232, ADS1234
–0.3 to +6
–0.3 to +6
–0.3 to +0.3
100, Momentary
10, Continuous
–0.3 to AVDD + 0.3
–0.3 to DVDD + 0.3
+150
–40 to +105
–60 to +150
UNIT
V
V
V
mA
mA
V
V
°C
°C
°C
(1) Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings
only, and functional operation of the device at these or any other conditions beyond those indicated under Recommended Operating
Conditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
2 Copyright © 2005–2008, Texas Instruments Incorporated
Product Folder Link(s): ADS1232 ADS1234


Features www.ti.com ADS1232 ADS1234 SBAS350F – JUNE 2005 – REVISED FEBRUARY 2008 24 -Bit Analog-to-Digital Converter For Br idge Sensors FEATURES 1 •2 Complete Front-End for Bridge Sensors • Up to 23.5 Effective Bits • Onboard, Low-No ise PGA • RMS Noise: 17nV at 10SPS (P GA = 128) 44nV at 80SPS (PGA = 128) • 19.2-Bit Noise-Free Resolution at Gain = 64 • Over 100dB Simultaneous 50Hz and 60Hz Rejection • Flexible Clockin g: Low-Drift Onboard Oscillator (±3%) Optional External Crystal • Selectabl e Gains of 1, 2, 64, and 128 • Easy R atiometric Measurements– External Vol tage Reference up to 5V • Selectable 10SPS or 80SPS Data Rates • Two-Chann el Differential Input with Built-In Tem perature Sensor (ADS1232) • Four-Chan nel Differential Input (ADS1234) • Si mple Serial Digital Interface • Suppl y Range: 2.7V to 5.3V • –40°C to + 105°C Temperature Range APPLICATIONS Weigh Scales • Strain Gauges • P ressure Sensors • Industrial Process Control DESCRIPTION The ADS1232 and ADS1234 are precision 24-bit analog-.
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