TI ADS1262高分辨率低漂移称重仪参考设计

TI公司的ADS1262是32位低噪音低漂移38.4-kSPS Delta-Sigma (ΔΣ) ADC,集成了PGA,基准电压和内部故障监视器,数据速率2.5 SPS 到38400 SPS,失调1 nV/℃,增益漂移 0.5 ppm/℃,线性度3ppm,噪音7 nVRMS(2.5 SPS,增益= 32),主要用在高分辨率PLC,温度和压力测量仪,称重仪和应力表,分析仪器,图表记录仪和面板表.本文介绍了ADS1262主要特性,框图和应用电路,以及高分辨率低漂移称重仪参考设计TIPD188主要特性,电路图,材料清单和PCB布局图.
The ADS1262 and ADS1263 are low-noise, low-drift, 38.4-kSPS, delta-sigma (ΔΣ) ADCs with an integrated PGA, reference, and internal fault monitors. The ADS1263 integrates an auxiliary, 24-bit, ΔΣ 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 ΔΣ 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 130-dB rejection of 50-Hz 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℃ to +125℃ temperature range.
ADS1262主要特性:

Precision, 32-bit, ΔΣ ADC
Auxiliary 24-Bit, ΔΣ 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/℃
Gain Drift: 0.5 ppm/℃
Noise: 7 nVRMS (2.5 SPS, Gain = 32)
Linearity: 3 ppm
2.5-V Internal Voltage Reference
Temperature Drift: 2 ppm/℃
50-Hz and 60-Hz Rejection
Single-Cycle Settled Conversions
Dual Sensor Excitation Current Sources<...