The ADS1246, ADS1247, and ADS1248 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.
● 24 Bits, No Missing Codes
● Programmable Data Rates Up to 2 kSPS
● Single-Cycle Settling for All Data Rates
● Simultaneous 50-Hz and 60-Hz Rejection at 20 SPS
● Analog Multiplexer With 8 (ADS1248) and 4
●(ADS1247) Independently Selectable Inputs
● Low-Noise PGA: 48 nVRMS at PGA = 128
● Dual-Matched Programmable Excitation Current Sources
● Low-Drift Internal 2.048-V Reference:
●10 ppm/°C (Maximum)
● Sensor Burn-Out Detection
● 4 or 8 General-Purpose I/Os (ADS1247, ADS1248)
● Internal Temperature Sensor
● Power Supply and VREF Monitoring (ADS1247, ADS1248)
● Self and System Calibration
● SPI™-Compatible Serial Interface
● Analog Supply: Unipolar (2.7 V to 5.25 V) and Bipolar (±2.5 V) Operation
● Digital Supply: 2.7 V to 5.25 V
● Operating Temperature 40°C to 125°C
● APPLICATIONS
● Temperature Sensor Measurements:
● RTDs, Thermocouples, and Thermistors
● Pressure Measurements
● Flow Meters
● Factory Automation and Process Controls
●All other trademarks are the property of their respective owners
