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 devices also include a precision voltage reference and internal fault monitors. The sensor-ready ADCs give a high-accuracy, single-chip solution for the most demanding measurements, for example, weigh scales 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-ended inputs. The ADS1261 supports five differential or 10 single-ended inputs. The integrated current sources simplify the measurement of RTDs.
The flexible digital filter is programmable for single-cycle settled conversions, while supplying simultaneous 50-Hz and 60-Hz line cycle rejection. Signal and reference monitors, a temperature 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.
Features
- 24-Bit, High-Precision ADCs
- Offset Drift: 1 nV/°C
- Gain Drift: 0.5 ppm/°C
- Noise: 30 nVRMS (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
