Burr Brown Products
from Texas Instruments
SBAS366A – OCTOBER 2006 – REVISED JULY 2007
20-Bit Analog-to-Digital Converter
For Bridge Sensors
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FEATURES
Complete Front-End for Bridge Sensor
Onboard PGA with Gain of 64 or 128
Onboard Oscillator
RMS Noise:
40nV at 10SPS (G = 128)
88nV at 80SPS (G = 128)
18-Bit Noise-Free Resolution
Selectable 10SPS or 80SPS Data Rates
Simultaneous 50Hz and 60Hz Rejection at
10SPS
External Voltage Reference up to 5V for
Ratiometric Measurements
Simple, Pin-Driven Control
Two-Wire Serial Digital Interface
Tiny 16-pin TSSOP Package
Supply Range: 2.7V to 5.3V
–40°C to +85°C Temperature Range
DESCRIPTION
The ADS1230 is a precision 20-bit analog-to-digital
converter (ADC). With an onboard low-noise
programmable gain amplifier (PGA), onboard
oscillator, and precision 20-bit delta-sigma ADC, the
ADS1230 provides a complete front-end solution for
bridge sensor applications including weigh scales,
strain gauges, and pressure sensors.
The low-noise PGA has a gain of 64 or 128,
supporting a full-scale differential input of ±39mV or
±19.5mV, respectively. The delta-sigma ADC has
20-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 ADS1230 can be
clocked by the internal oscillator or an external clock
source. Offset calibration is performed on-demand,
and the ADS1230 can be put in a low-power standby
mode or shut off completely in power-down mode.
All of the features of the ADS1230 are controlled by
dedicated pins; there are no digital registers to
program. Data are output over an easily-isolated
serial interface that connects directly to the MSP430
and other microcontrollers.
The ADS1230 is available in a TSSOP-16 package
and is specified from –40°C to +85°C.
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APPLICATIONS
Weigh Scales
Strain Gauges
Pressure Sensors
Industrial Process Control
AVDD
CAP
REFP REFN
DVDD
Gain = 64 or 128
AINP
PGA
AINN
DS
ADC
PDWN
DRDY/DOUT
SCLK
Internal
Oscillator
SPEED
AGND
GAIN
CAP
CLKIN
DGND
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Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
All trademarks are the property of their respective owners.
Copyright © 2006–2007, Texas Instruments Incorporated
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.
TI [ TEXAS INSTRUMENTS ]
