ADS1261 - 24-bit 40kSPS 10-ch delta-sigma ADC w/ PGA, Vref, 2x IDACs, and AC excitation for factory automation

The ADS1260 and ADS1261(ADS126x) are precision, 40-kSPS, delta-sigma (ΔΣ)analog-to-digital converters (ADCs) that include a programmable gain amplifier (PGA). The devicesalso include a precision voltage reference and internal fault monitors. The sensor-ready ADCs givea high-accuracy, single-chip solution for the most demanding measurements, for example, weighscales and resistance temperature detectors (RTDs).

The ADCs contain an input signal multiplexer, a low-noise PGA (with gains from 1 to 128),a 24-bit ΔΣ modulator, a precision voltage reference, and a programmable digital filter.

The high-impedance PGA inputs (1 GΩ) decrease measurement error due to sensor loading.The ADS1260 supports three differential or five single-endedinputs. The ADS1261 supports five differential or 10 single-endedinputs. The integrated current sources simplify the measurement of RTDs.

The flexible digital filter is programmable for single-cycle settled conversions, whilesupplying simultaneous 50-Hz and 60-Hz line cycle rejection. Signal and reference monitors, atemperature sensor, and CRC data verification make data reliability better.

The ADS126x are pin compatible devices given in a 5-mm ×5-mm QFN package and are specified across the –40°C to +125°C temperature range.

• 24-Bit, High-Precision ADCs
  • Offset Drift: 1 nV/°C
  • Gain Drift: 0.5 ppm/°C
  • Noise: 30 nV_RMS (20 SPS, Gain = 128)
  • Linearity: 2 ppm
• CMOS PGA Gain: 1 to 128
• Wide Input Voltage Range: ±7 mV to ±5 V
• Data Rate: 2.5 SPS to 40 kSPS
• 2.5-V Reference: 2 ppm/°C
• Simultaneous 50-Hz and 60-Hz Rejection Mode
• Single-Cycle Settling Mode
• Signal and Reference Monitors
• 5-V or ±2.5-V Power Supply
• Internal Temperature Sensor
• Cyclic Redundancy Check (CRC)
• Excitation Current Sources
• Sensor Burn-Out Current Sources
• Four General-Purpose Input/Outputs (ADS1261)
• AC Excitation for Bridge Sensors (ADS1261)
• 5-mm × 5-mm QFN Package

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