Overview
The ADS1261BIRHBR, produced by Texas Instruments, is a high-precision, 40-kSPS delta-sigma (ΔΣ) analog-to-digital converter (ADC) that includes a programmable gain amplifier (PGA). This device is part of the ADS126x family and is designed to provide a single-chip solution for demanding measurement applications such as weigh scales, strain-gauge digitizers, and resistance temperature detectors (RTDs).
The ADS1261B supports five differential or ten single-ended inputs, making it highly versatile for various sensing applications. It features a low-noise PGA with gains ranging from 1 to 128, a 24-bit ΔΣ modulator, and a precision voltage reference. The device also includes integrated current sources, signal and reference monitors, a temperature sensor, and cyclic redundancy check (CRC) data verification for enhanced data reliability.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Resolution | 24 | Bits |
| Data Rate | 2.5 to 40,000 | SPS |
| PGA Gain Settings | 1, 2, 4, 8, 16, 32, 64, 128 | V/V |
| Input Voltage Range | ±7 mV to ±5 V | V |
| Differential Input Impedance | 1 GΩ | Ω |
| Internal Voltage Reference | 2.5 V | V |
| Temperature Drift of Reference | 2 ppm/°C (ADS1260B, ADS1261B) | ppm/°C |
| Power Supply Voltage | 4.75 to 5.25 V (Analog), 2.7 to 5.25 V (Digital) | V |
| Package | 5-mm × 5-mm VQFN-32 | - |
| Operating Temperature Range | –40°C to +125°C | °C |
Key Features
- 24-bit, high-precision ADC with low offset drift (1 nV/°C) and gain drift (0.5 ppm/°C)
- CMOS PGA with gains from 1 to 128
- Wide input voltage range: ±7 mV to ±5 V
- Simultaneous 50-Hz and 60-Hz rejection mode and single-cycle settling mode
- Signal and reference monitors, internal temperature sensor, and CRC data verification
- Excitation current sources and sensor burn-out current sources
- Four general-purpose inputs/outputs and AC excitation for bridge sensors (ADS1261)
- High-impedance PGA inputs (1 GΩ) to minimize measurement error due to sensor loading
Applications
- PLC analog input modules
- Weigh scales and strain-gauge digitizers
- Temperature and pressure measurement
- Lab instrumentation
- Process analytics
Q & A
- What is the resolution of the ADS1261B ADC?
The ADS1261B has a 24-bit resolution.
- What are the PGA gain settings available on the ADS1261B?
The PGA gain settings range from 1 to 128.
- What is the input voltage range of the ADS1261B?
The input voltage range is ±7 mV to ±5 V.
- Does the ADS1261B support simultaneous 50-Hz and 60-Hz rejection?
- What is the operating temperature range of the ADS1261B?
The operating temperature range is –40°C to +125°C.
- Does the ADS1261B have integrated current sources?
- What package is the ADS1261B available in?
The ADS1261B is available in a 5-mm × 5-mm VQFN-32 package.
- Does the ADS1261B support AC excitation for bridge sensors?
- What is the purpose of the internal temperature sensor in the ADS1261B?
The internal temperature sensor helps in monitoring and compensating for temperature-related drifts in measurements.
- Does the ADS1261B have CRC data verification?
