PRODUCT PREVIEW
FEATURES DESCRIPTION
APPLICATIONS
Input
Mux ∆Σ ADC
REFP REFN
PGA
A = 1, 2, 64,
128
CAP DVDD
DGNDAGNDA1/TEMP(1) A0
NOTE: (1) A1 for ADS1234, TEMP for ADS1232.
AINP1
AINN1
AINP2
AINN2
AINP3
AINN3
AINP4
AINN4
ADS1234 Only
SCLK
SPEED
DRDY/DOUT
PDWN
GAIN [1:0]
AVDD
CAP
External Oscillator
Internal Oscillator
XTAL1/CLKIN XTAL2
ADS1232
ADS1234
SBAS350 – JUNE 2005
Ultra Low-Noise, 24-Bit Analog-to-Digital Converter
• Up to 23.5 Effective Bits The ADS1232 and ADS1234 are precision
analog-to-digital (A/D) converters featuring true 23.5• RMS Noise:
effective-bit performance and exceptional ease of– 17nV at 10Hz
use. Selectable gains of 1, 2, 64, or 128 allow– 44nV at 80Hz
full-scale differential input ranges of ± 2.5V to
• On-Board Low Noise Gain-Amp ± 19.5mV with a +5V reference. While the ADS1232
offers a two-channel differential input and a built-in• 19.2-Bit Noise-Free Resolution at Gain = 64
temperature sensor, the ADS1234 features a• Simultaneous 50Hz and 60Hz Rejection:
four-channel differential input multiplexer. A very
– Internal Clock: 110 dB low-noise Gain-Amp features low differential input
current to minimize errors when using– External Clock: 130 dB
high-impedance transducers. An on-board oscillator• ± 1% Low-Drift On-Board Oscillator
is provided for excellent 50Hz and 60Hz rejection
• Selectable Gains of 1, 2, 64, and 128 without an external clock source. The devices also
feature a low current driver to accommodate an• Selectable 10/80SPS Conversion Rates
external crystal; they also accept external clock• 2-Channel Differential Input with Built-In Temp
sources for all applications.sensor (ADS1232)
All of the features of the ADS1232/ADS1234 are• 4-Channel Differential Input (ADS1234)
hard-wire selected, without software programming.• External Reference up to AVDD
Data is accessed over a simple serial interface
• Simple Serial Digital Interface compatible with popular microcontrollers such as the
MSP430. The ADS1232 is available in the 24-pin• Supply Range: 2.7V to 5.3V
TSSOP package, and the ADS1234 is available in• – 40 ° C to +105 ° C Temperature Range
the 28-pin TSSOP.
• Weigh Scales
• Strain Gauges
• Bridge Sensors
• Industrial Process Control
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.
PRODUCT PREVIEW information concerns products in the forma- Copyright © 2005, Texas Instruments Incorporated
tive or design phase of development. Characteristic data and other
specifications are design goals. Texas Instruments reserves the
right to change or discontinue these products without notice.