1FEATURES

2• 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

APPLICATIONS

• Weigh Scales

• Strain Gauges

• Pressure Sensors

• Industrial Process Control

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.