ADS1248

适用于精密传感器测量的 24 位、2kSPS、8 通道 ADC

The ADS1246, ADS1247, and are highly-integrated, precision, 24-bit analog-to-digital converters ADCs. The devices feature an onboard, low-noise, programmable gain amplifier PGA, a precision delta-sigma ΔΣ ADC with a single-cycle settling digital filter, and an internal oscillator. The ADS1247 and ADS1248 also provide a built-in, very low drift voltage reference with 10-mA output capacity, and two matched programmable current digital-to-analog converters DACs. The devices provide a complete front-end solution for temperature sensor applications including thermal couples, thermistors, and resistance temperature detectors RTDs.

An input multiplexer supports four differential inputs for the ADS1248, two for the ADS1247, and one for the ADS1246. In addition, the multiplexer has a sensor burn-out detect, voltage bias for thermocouples, system monitoring, and general-purpose digital I/Os ADS1247 and ADS1248. The onboard, low-noise PGA provides selectable gains of 1 to 128. The ΔΣ modulator and adjustable digital filter settle in only one cycle, for fast channel cycling when using the input multiplexer, and support data rates up to 2 kSPS. For data rates of 20 SPS or less, both 50-Hz and 60-Hz interference are rejected by the filter.

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24 Bits, No Missing Codes

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Programmable Data Rates Up to 2 kSPS

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Single-Cycle Settling for All Data Rates

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Simultaneous 50-Hz and 60-Hz Rejection at 20 SPS

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Analog Multiplexer With 8 ADS1248 and 4

ADS1247 Independently Selectable Inputs

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Low-Noise PGA: 48 nVRMS at PGA = 128

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Dual-Matched Programmable Excitation Current Sources

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Low-Drift Internal 2.048-V Reference:

10 ppm/°C Maximum

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Sensor Burn-Out Detection

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4 or 8 General-Purpose I/Os ADS1247, ADS1248

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Internal Temperature Sensor

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Power Supply and VREF Monitoring ADS1247, ADS1248

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Self and System Calibration

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SPI™-Compatible Serial Interface

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Analog Supply: Unipolar 2.7 V to 5.25 V and Bipolar ±2.5 V Operation

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Digital Supply: 2.7 V to 5.25 V

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Operating Temperature –40°C to 125°C

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APPLICA ONS

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Temperature Sensor Measurements:

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RTDs, Thermocouples, and Thermistors

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Pressure Measurements

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Flow Meters

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Factory Automation and Process Controls

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