Texas Instruments' ADS1261 is a precision, 40 kSPS, delta-sigma (ΔΣ) analog-to-digital converter (ADC) with an integrated programmable gain amplifier (PGA) and internal fault monitors. The sensor-ready ADC provides a high-accuracy, single-chip solution for the most demanding measurements, including weigh scales and resistance temperature devices (RTD).
The ADC is comprised of an input signal multiplexer, a low-noise PGA, providing gain from 1 to 128, a 24-bit ΔΣ modulator, and a programmable digital filter.
The high-impedance PGA inputs (1 GΩ) reduce measurement error caused by sensor loading. The ADS1261 supports five differential or ten single-ended inputs. The integrated current sources simplify the measurement of RTDs.
The flexible digital filter is programmable for single-cycle settled conversions while providing simultaneous 50 Hz and 60 Hz line cycle rejection. Signal and reference monitors, a temperature sensor, and CRC data verification enhance data reliability.
The ADS1261 is a pin-compatible device offered in a 5 mm x 5 mm QFN package and is specified over the -40°C to +125°C temperature range.
- 24-bit, high-precision ADC
- 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
- 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
- Excitation current sources
- Sensor burn-out current sources
- Four general-purpose input/outputs
- AC excitation for bridge sensors
- 5 mm x 5 mm QFN package
- PLC analog input modules
- Weigh scales and strain-gauge digitizers
- Temperature, pressure measurement
- Lab instrumentation
- Process analytics