ADS1263 ADC IC Chip

ADS1263( 32-Bit, Precision, 38-kSPS, ADC with PGA and Voltage Reference)

Introduction

The ADS1262 and ADS1263 are low-noise, low-drift,38.4kSPS, delta-sigma (Δ-Σ) ADCs with an integrated PGA, reference, and internal fault monitors. The ADS1263 integrates an auxiliary, 24-bit,Δ-Σ ADC intended for background measurements. The sensor-ready ADCs provide complete, high-accuracy, one-chip measurement solutions for the most demanding sensor applications, including weigh scales, strain-gauge sensors,thermocouples,and resistance temperature devices (RTD).

The ADCs are comprised of a low-noise, CMOS PGA(gains 1 to 32),a Δ-Σ modulator, followed by a programmable digital filter. The flexible analog front-end ( AFE) incorporates two sensor-excitation current sources suitable for direct RTD measurement.

A single-cycle settling digital filter maximizes multiple-input conversion throughput, while providing 130dB rejection of 50Hz and 60-Hz line cycle interference.

The ADS1262 and ADS1263 are pin and functional compatible. These devices are available in a 28-pin TSSOP package and are fully specified over the -40°C to +125°C temperature range.

Feature

• Precision, 32-bit,Δ-Σ ADC
• Auxiliary 24-Bit,Δ-Σ ADC (ADS1263)
• Data Rates: 2.5 SPS to 38400 SPS
• Differential Input, CMOS PGA
• 11 Multifunction Analog Inputs .
• High-Accuracy Architecture
  – Offset Drift: 1 nV/°C
  – Gain Drift: 0.5 ppm/°C .
  – Noise: 7 nVRMS (2.5 SPS, Gain = 32)
  – Linearity: 3 ppm
• 2.5V Internal Voltage Reference
  – Temperature Drift: 2 ppm/°C
• 50Hz and 60-Hz Rejection
• Single-Cycle Settled Conversions
• Dual Sensor Excitation Current Sources
• Internal Fault Monitors
• Internal ADC Test Signal
• 8 General-Purpose Input/Outputs

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