ADS1278 - 八路、144kHz、24 位同步采样 Σ-Δ ADC

ADS1278是TI德州仪器公司的一款精密ADC(<=10MSPS)产品，ADS1278是八路、144kHz、24 位同步采样 Σ-Δ ADC，本站介绍了ADS1278的封装应用图解、特点和优点、功能等，并给出了与ADS1278相关的TI元器件型号供参考。

ADS1278 - 八路、144kHz、24 位同步采样 Σ-Δ ADC - 精密ADC(<=10MSPS) - 模数转换器 - 德州仪器

产品描述

Based on the single-channel ADS1271, the ADS1274 (quad) and ADS1278 (octal) are 24-bit, delta-sigma (ΔΣ) analog-to-digital converters (ADCs) with data rates up to 144k samples per second (SPS), allowing simultaneous sampling of four or eight channels. The devices are offered in identical packages, permitting drop-in expandability.

Traditionally, industrial delta-sigma ADCs offering good drift performance use digital filters with large passband droop. As a result, they have limited signal bandwidth and are mostly suited for dc measurements. High-resolution ADCs in audio applications offer larger usable bandwidths, but the offset and drift specifications are significantly weaker than respective industrial counterparts. The ADS1274 and ADS1278 combine these types of converters, allowing high-precision industrial measurement with excellent dc and ac specifications.

The high-order, chopper-stabilized modulator achieves very low drift with low in-band noise. The onboard decimation filter suppresses modulator and signal out-of-band noise. These ADCs provide a usable signal bandwidth up to 90% of the Nyquist rate with less than 0.005dB of ripple.

Four operating modes allow for optimization of speed, resolution, and power. All operations are controlled directly by pins; there are no registers to program. The devices are fully specified over the extended industrial range (–40°C to +105°C) and are available in an HTQFP-64 PowerPAD™ package.

产品特性

Simultaneously Measure Four/Eight Channels
Up to 144kSPS Data Rate
AC Performance: 70kHz Bandwidth 111dB SNR (High-Resolution Mode) –108dB THD
DC Accuracy: 0.8µV/°C Offset Drift 1.3ppm/°C Gain Drift
Selectable Operating Modes: High-Speed: 144kSPS, 106dB SNR High-Resolution: 52kSPS, 111dB SNR Low-Power: 52kSPS, 31mW/ch Low-Speed: 10kSPS, 7mW/ch
Linear Phase Digital Filter
SPI™ or Frame-Sync Serial Interface
Low Sampling Aperture Error
Modulator Output Option (digital filter bypass)
Analog Supply: 5V
Digital Core: 1.8V
I/O Supply: 1.8V to 3.3V

APPLICATIONS

Vibration/Modal Analysis
Multi-Channel Data Acquisition
Acoustics/Dynamic Strain Gauges
Pressure Sensors

PowerPAD is a trademark of Texas Instruments, Inc. SPI is a trademark of Motorola, Inc. All other trademarks are the property of their respective owners.

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