ADS1278-HT中文资料高温四路/八路同步采样 24 位模数转换器数据手册TI规格书

描述 Description

Based on the single-channel ADS1271, the ADS1278 (octal) is a 24-bit, delta-sigma (ΔΣ) analog-to-digital converter (ADC) with data rates up to 128 k samples per second (SPS), allowing simultaneous sampling of eight channels.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 ADS1278 combines 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 0.005 dB 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 device is fully specified over the extended industrial range (–55°C to 210°C) and is available in an HTQFP-64 PowerPAD package (–55°C to 175°C), an 84-pin HFQ package and a KGD chiptray option.

特性 Features

• Simultaneously Measure Eight Channels
• AC Performance: 62-kHz Bandwidth 111-dB SNR (High-Resolution Mode) –108-dB THD
• Selectable Operating Modes: High-Speed: 128 kSPS, 106 dB SNR High-Resolution: 52 kSPS, 111 dB SNR Low-Power: 52 kSPS, 31 mW/ch Low-Speed: 10 kSPS, 7 mW/ch
• SPI or Frame-Sync Serial Interface
• Modulator Output Option (digital filter bypass)
• Digital Core: 1.8 V
• Currently Available in an HTQFP-64 PowerPAD™ package, an 84-Pin HFQ Package and a KGD Chiptray Option
• Controlled Baseline
• One Fabrication Site
• Extended Product Life Cycle
• Product Traceability
• APPLICATIONS
• High Temperature Environments
• Multi-Channel Data Acquisition
• Pressure Sensors


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