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ADS1246 Arkusz danych(PDF) 1 Page - Texas Instruments |
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ADS1246 Arkusz danych(HTML) 1 Page - Texas Instruments |
1 / 70 page Input Mux 3rdOrder DS Modulator REFP REFN PGA Burnout Detect Burnout Detect DVDD DGND ADS1246 AVSS AIN0 AIN1 SCLK DIN DRDY DOUT/DRDY CS START RESET AVDD InternalOscillator Adjustable Digital Filter Serial Interface and Control CLK Input Mux 3rdOrder DS Modulator REFP1 REFN1 VREFOUT VREFCOM REFP0/ GPIO0 REFN0/ GPIO1 Burnout Detect Burnout Detect DVDD DGND IEXC1 AVSS AIN0/IEXC AIN1/IEXC AIN2/IEXC/GPIO2 AIN3/IEXC/GPIO3 AIN4/IEXC/GPIO4 AIN5/IEXC/GPIO5 AIN6/IEXC/GPIO6 AIN7/IEXC/GPIO7 ADS1248 Only SCLK DIN DRDY DOUT/DRDY CS START RESET AVDD IEXC2 InternalOscillator Voltage Reference Serial Interface and Control V BIAS GPIO CLK ADS1248 Only ADS1247 ADS1248 PGA System Monitor Adjustable Digital Filter Dual Current DACs VREFMux ADS1248 Only V BIAS ADS1246 ADS1247 ADS1248 www.ti.com SBAS426G – AUGUST 2008 – REVISED OCTOBER 2011 24-Bit Analog-to-Digital Converters for Temperature Sensors Check for Samples: ADS1246, ADS1247, ADS1248 1 FEATURES DESCRIPTION The ADS1246, ADS1247, and ADS1248 are 23 • 24 Bits, No Missing Codes highly-integrated, precision, 24-bit analog-to-digital • Data Output Rates Up to 2kSPS converters (ADCs). The ADS1246/7/8 feature an • Single-Cycle Settling for All Data Rates onboard, low-noise, programmable gain amplifier (PGA), a precision delta-sigma ( ΔΣ) ADC with a • Simultaneous 50/60Hz Rejection at 20SPS single-cycle settling digital filter, and an internal • 4 Differential/7 Single-Ended Inputs (ADS1248) oscillator. The ADS1247 and ADS1248 also provide a • 2 Differential/3 Single-Ended Inputs (ADS1247) built-in, very low drift voltage reference with 10mA output capacity, and two matched programmable • Low-Noise PGA: 48nV at PGA = 128 current digital-to-analog converters (DACs). The • Matched Current Source DACs ADS1246/7/8 provide a complete front-end solution • Very Low Drift Internal Voltage Reference: for temperature sensor applications including thermal 10ppm/ °C (max) couples, thermistors, and RTDs. • Sensor Burnout Detection An input multiplexer supports four differential inputs • 4/8 General-Purpose I/Os (ADS1247/8) for the ADS1248, two for the ADS1247, and one for the ADS1246. In addition, the multiplexer has a • Internal Temperature Sensor sensor burnout detect, voltage bias for • Power Supply and VREF Monitoring thermocouples, system monitoring, and (ADS1247/8) general-purpose digital I/Os (ADS1247 and • Self and System Calibration ADS1248). The onboard, low-noise PGA provides selectable gains of 1 to 128. The ΔΣ modulator and • SPI ™-Compatible Serial Interface adjustable digital filter settle in only one cycle, for fast • Analog Supply Unipolar (+2.7V to channel cycling when using the input multiplexer, and +5.25V)/Bipolar ( ±2.5V) Operation support data rates up to 2kSPS. For data rates of • Digital Supply: +2.7V to +5.25V 20SPS or less, both 50Hz and 60Hz interference are rejected by the filter. • Operating Temperature –40°C to +125°C The ADS1246 is offered in a small TSSOP-16 APPLICATIONS package, the ADS1247 is available in a TSSOP-20 package, and the ADS1248 in a TSSOP-28 package. • Temperature Measurement All three devices are rated over the extended – RTDs, Thermocouples, and Thermistors specified temperature range of –40°C to +105°C. • Pressure Measurement • Industrial Process Control 1 Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. 2 SPI is a trademark of Motorola, Inc. 3 All other trademarks are the property of their respective owners. PRODUCTION DATA information is current as of publication date. Copyright © 2008–2011, Texas Instruments Incorporated Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. |
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