1FEATURES

23• 24 Bits, No Missing Codes

• Output Data Rates From 10 To 14kSPS

• High Performance:

– INL: 0.4ppm

– Reference Drift: 2ppm/°C

– Gain Drift: 0.5ppm/°C

– Offset Drift: 0.05μV/°C

– Noise: 0.7μVRMS at 60SPS

• Simultaneous 50/60Hz Rejection at 10SPS

• Single-Cycle Settling

• Internal Oscillator

• Out-of-Range Detection

• Readback Data Integrity by Checksum and

Redundant Data Read Capability

• SPI™-Compatible Interface

• Analog Supply: +5V or ±2.5V

• Digital Supply: +2.7V to +5V

• Low Power: 13mW

APPLICATIONS

• Industrial Process Control

• Scientific Instrumentation

• Test and Measurement

DESCRIPTION

The ADS1259 is a high-linearity, low-drift, 24-bit,

analog-to-digital converter (ADC) designed for the

needs of industrial process control, precision

instrumentation, and other exacting applications.

Combined with a signal amplifier (such as the

PGA280), a high-resolution, high-accuracy measurement system is formed that is capable of

digitizing a wide range of signals.

The converter uses a fourth-order, inherently stable,

delta-sigma (ΔΣ) modulator that provides outstanding

noise and linearity performance. The data rates are

programmable up to 14kSPS including 10SPS, 50SPS, and 60SPS that provide excellent normal

mode line-cycle rejection. The digital filter can be

programmed for a fast settling mode where the

conversions settle in a single cycle, or programmed

for a high line-cycle rejection mode. A fast responding input over-range detector flags the conversion data if

an input over-range should occur.

The ADS1259 also provides an integrated low-noise,

very low drift 2.5V reference. The on-chip oscillator,

an external crystal, or an external clock can by used

as the ADC clock source.

Data and control communication are handled over a

4MHz, SPI-compatible interface capable of operating

with a minimum of three wires. Data integrity is

augmented by data bytes checksum and redundant

data read capability. Conversions are synchronized

either by command or by pin.

Dissipating only 13mW in operation, the ADS1259

can be powered down, dissipating less than 25μW.

The ADS1259 is offered in a TSSOP-20 package and

is fully specified from –40°C to +105°C.