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ADS1248芯片中文资料

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标签: ADS1248

ADS1248

ADS1248芯片的资料,适用在RTD等方面

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wwwticom ADS1246 ADS1247 ADS1248 SBAS426G AUGUST 2008REVISED OCTOBER 2011 24Bit AnalogtoDigital Converters for Temperature Sensors Check for Samples ADS1246 ADS1247 ADS1248 1FEATURES 23 24 Bits No Missing Codes Data Output Rates Up to 2kSPS SingleCycle Settling for All Data Rates Simultaneous 5060Hz Rejection at 20SPS LowNoise PGA 48nV at PGA 128 Matched Current Source DACs Very Low Drift Internal Voltage Reference 4 Differential7 SingleEnded Inputs ADS1248 2 Differential3 SingleEnded I......

www.ti.com ADS1246 ADS1247 ADS1248 SBAS426G –AUGUST 2008–REVISED OCTOBER 2011 24-Bit Analog-to-Digital Converters for Temperature Sensors Check for Samples: ADS1246, ADS1247, ADS1248 1FEATURES 23• 24 Bits, No Missing Codes • Data Output Rates Up to 2kSPS • Single-Cycle Settling for All Data Rates • Simultaneous 50/60Hz Rejection at 20SPS • • • Low-Noise PGA: 48nV at PGA = 128 • Matched Current Source DACs • Very Low Drift Internal Voltage Reference: 4 Differential/7 Single-Ended Inputs (ADS1248) 2 Differential/3 Single-Ended Inputs (ADS1247) 10ppm/°C (max) • Sensor Burnout Detection • • • Power Supply and VREF Monitoring 4/8 General-Purpose I/Os (ADS1247/8) Internal Temperature Sensor (ADS1247/8) • Self and System Calibration • SPI™-Compatible Serial Interface • Analog Supply Unipolar (+2.7V to +5.25V)/Bipolar (±2.5V) Operation • Digital Supply: +2.7V to +5.25V • Operating Temperature –40°C to +125°C APPLICATIONS • Temperature Measurement – RTDs, Thermocouples, and Thermistors • Pressure Measurement • Industrial Process Control and ADS1248 DESCRIPTION The ADS1246, ADS1247, are highly-integrated, precision, 24-bit analog-to-digital converters (ADCs). The ADS1246/7/8 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 10mA output capacity, and two matched programmable current digital-to-analog converters (DACs). The ADS1246/7/8 provide a complete front-end solution for temperature sensor applications including thermal couples, thermistors, and RTDs. An input multiplexer supports four differential inputs for the ADS1248, two for the ADS1247, and one for In addition, the multiplexer has a the ADS1246. detect, sensor for and system thermocouples, I/Os general-purpose digital 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 2kSPS. For data rates of 20SPS or less, both 50Hz and 60Hz interference are rejected by the filter. The ADS1246 is offered in a small TSSOP-16 package, the ADS1247 is available in a TSSOP-20 package, and the ADS1248 in a TSSOP-28 package. All the extended specified temperature range of –40°C to +105°C. three devices are rated over burnout voltage monitoring, bias (ADS1247 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. 2SPI is a trademark of Motorola, Inc. 3All other trademarks are the property of their respective owners. PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. Copyright © 2008–2011, Texas Instruments Incorporated ADS1246 ADS1247 ADS1248 SBAS426G –AUGUST 2008–REVISED OCTOBER 2011 www.ti.com This integrated circuit can be damaged by ESD. Texas Instruments recommends that all appropriate precautions. Failure to observe proper handling and installation procedures can cause damage. integrated circuits be handled with ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more susceptible to damage because very small parametric changes could cause the device not to meet its published specifications. PACKAGE/ORDERING INFORMATION(1) PRODUCT NUMBER OF INPUTS VOLTAGE REFERENCE DUAL SENSOR EXCITATION CURRENT SOURCES ADS1246 ADS1247 ADS1248 1 Differential 1 Single-Ended 2 Differential or or or 3 Single-Ended 4 Differential 7 Single-Ended External Internal or External Internal or External NO YES YES PACKAGE- LEAD TSSOP-16 TSSOP-20 TSSOP-28 (1) For the most current package and ordering information, see the Package Option Addendum at the end of this data sheet, or see the TI website at www.ti.com ABSOLUTE MAXIMUM RATINGS(1) Over operating free-air temperature range (unless otherwise noted). PARAMETER AVDD to AVSS AVSS to DGND DVDD to DGND Input current Analog input voltage to AVSS Digital input voltage to DGND Maximum junction temperature Operating temperature range Storage temperature range ADS1246, ADS1247, ADS1248 MIN –0.3 –2.8 –0.3 MAX +5.5 +0.3 +5.5 100, momentary 10, continuous AVSS – 0.3 –0.3 –40 –60 AVDD + 0.3 DVDD + 0.3 +150 +125 +150 UNIT V V V mA mA V V °C °C °C (1) Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. 2 Copyright © 2008–2011, Texas Instruments Incorporated www.ti.com ADS1246 ADS1247 ADS1248 SBAS426G –AUGUST 2008–REVISED OCTOBER 2011 ELECTRICAL CHARACTERISTICS Minimum/maximum specifications apply from –40°C to +105°C. Typical specifications are at +25°C. All specifications at AVDD = +5V, DVDD = +3.3V, AVSS = 0V, VREF = +2.048V, and oscillator frequency = 4.096MHz, unless otherwise noted. CONDITIONS MIN TYP MAX UNIT ADS1246, ADS1247, ADS1248 ±VREF/PGA (1) 100 See Table 7 1, 2, 4, 8, 16, 32, 64, 128 0.5, 2, or 10 (AVDD + AVSS)/2 400 No missing codes 24 PARAMETER ANALOG INPUTS Full-scale input voltage (VIN = ADCINP – ADCINN) Common-mode input range Differential input current Absolute input current PGA gain settings Burnout current source Bias voltage Bias voltage output impedance SYSTEM PERFORMANCE Resolution Data rate Integral nonlinearity (INL) Offset error Offset drift Gain error Gain drift ADC conversion time Noise Normal-mode rejection Common-mode rejection Power-supply rejection VOLTAGE REFERENCE INPUT Voltage reference input (VREF = VREFP – VREFN) Negative reference input (REFN) Positive reference input (REFP) Reference input current ON-CHIP VOLTAGE REFERENCE Output voltage Output current (3) Load regulation Drift (4) Startup time Differential input, end point fit, PGA = 1 VCM = 2.5V After calibration (2) T = +25°C, all PGAs, data rate = 40, 80, or 160SPS At dc, PGA = 1 At dc, PGA = 32 AVDD/DVDD at dc, PGA = 32, data rate = 80SPS TA = +25°C to +105°C TA = –40°C to +105°C V V pA μA V Ω Bits SPS ppm μV nV/°C 15 15 5, 10, 20, 40, 80, 160, 320, 640, 1000, 2000 6 –15 See Figure 11 to Figure 14 –0.02 ±0.005 0.02 % See Figure 19 to Figure 22 ppm/°C Single-cycle settling See Table 1 to Table 4 See Table 9 80 90 100 0.5 AVSS – 0.1 REFN + 0.5 2.038 90 125 135 30 2.048 50 2 6 See Table 10 dB dB dB V V V nA (AVDD – AVSS) – 1 REFP – 0.5 AVDD + 0.1 2.058 ±10 10 15 V mA μV/mA ppm/°C ppm/°C μs (1) For VREF > 2.7V, the analog input differential voltage should not exceed 2.7V/PGA. (2) Offset calibration on the order of noise. (3) Do not exceed this loading on the internal voltage reference. (4) Specified by the combination of design and final production test. Copyright © 2008–2011, Texas Instruments Incorporated 3 ADS1246 ADS1247 ADS1248 SBAS426G –AUGUST 2008–REVISED OCTOBER 2011 www.ti.com ELECTRICAL CHARACTERISTICS (continued) Minimum/maximum specifications apply from –40°C to +105°C. Typical specifications are at +25°C. All specifications at AVDD = +5V, DVDD = +3.3V, AVSS = 0V, VREF = +2.048V, and oscillator frequency = 4.096MHz, unless otherwise noted. ADS1246, ADS1247, ADS1248 PARAMETER CONDITIONS MIN TYP MAX UNIT CURRENT SOURCES (IDACS) Output current Voltage compliance All currents Initial error Initial mismatch Temperature drift Temperature drift matching SYSTEM MONITORS All currents, each IDAC All currents, between IDACs Each IDAC Between IDACs Voltage Temperature sensor reading Drift GENERAL-PURPOSE INPUT/OUTPUT (GPIO) TA = +25°C VIH VIL VOH VOL Logic levels IOH = 1mA IOL = 1mA DIGITAL INPUT/OUTPUT (other than GPIO) Logic levels VIH VIL VOH VOL Input leakage Clock input (CLK) Frequency Duty cycle Internal oscillator frequency POWER SUPPLY DVDD AVSS AVDD DVDD current AVDD current Power dissipation TEMPERATURE RANGE Specified Operating Storage IOH = 1mA IOL = 1mA DGND < VIN < DVDD Normal mode, DVDD = 5V, data rate = 20SPS, internal oscillator Normal mode, DVDD = 3.3V, data rate = 20SPS, internal oscillator Sleep mode Converting, AVDD = 5V, data rate = 20SPS, external reference Converting, AVDD = 3.3V, data rate = 20SPS, external reference Sleep mode Additional current with internal reference enabled AVDD = DVDD = 5V, data rate = 20SPS, internal oscillator, external reference AVDD = DVDD = 3.3V, data rate = 20SPS, internal oscillator, external reference –40 –40 –60 +105 +125 +150 4 Copyright © 2008–2011, Texas Instruments Incorporated AVDD 0.3AVDD 0.2 AVDD DVDD 0.3DVDD 0.2 DVDD ±10 4.5 75 4.3 5.25 0 AVSS + 5.25 50, 100, 250, 500, 750, 1000, 1500 –6 0.7AVDD AVSS 0.8AVDD 0.7DVDD DGND 0.8DVDD DGND 1 25 3.89 2.7 –2.5 AVSS + 2.7 AVDD – 0.7 ±1 ±0.15 100 10 118 405 4.096 230 210 0.2 225 200 0.1 180 2.3 1.4 μA V 6 % of FS % of FS ppm/°C ppm/°C mV μV/°C V V V V V V V V μA MHz % MHz V V V μA μA µA µA µA µA μA mW mW °C °C °C www.ti.com THERMAL INFORMATION THERMAL METRIC(1) θJA θJC(top) θJB ψJT ψJB θJC(bottom) Junction-to-ambient thermal resistance (2) Junction-to-case(top) thermal resistance (3) Junction-to-board thermal resistance (4) Junction-to-top characterization parameter (5) Junction-to-board characterization parameter (6) Junction-to-case(bottom) thermal resistance (7) ADS1246 ADS1247 ADS1248 SBAS426G –AUGUST 2008–REVISED OCTOBER 2011 ADS1246, ADS1247, ADS1248 TSSOP (IPW) 28 54.6 11.3 13.0 0.5 12.7 n/a UNITS °C/W (1) For more information about traditional and new thermal metrics, see the IC Package Thermal Metrics application report, SPRA953. (2) The junction-to-ambient thermal resistance under natural convection is obtained in a simulation on a JEDEC-standard, high-K board, as specified in JESD51-7, in an environment described in JESD51-2a. (3) The junction-to-case (top) thermal resistance is obtained by simulating a cold plate test on the package top. No specific JEDEC-standard test exists, but a close description can be found in the ANSI SEMI standard G30-88. (4) The junction-to-board thermal resistance is obtained by simulating in an environment with a ring cold plate fixture to control the PCB temperature, as described in JESD51-8. (5) The junction-to-top characterization parameter, ψJT, estimates the junction temperature of a device in a real system and is extracted from the simulation data for obtaining θJA, using a procedure described in JESD51-2a (sections 6 and 7). (6) The junction-to-board characterization parameter, ψJB, estimates the junction temperature of a device in a real system and is extracted from the simulation data for obtaining θJA , using a procedure described in JESD51-2a (sections 6 and 7). (7) The junction-to-case (bottom) thermal resistance is obtained by simulating a cold plate test on the exposed (power) pad. No specific JEDEC standard test exists, but a close description can be found in the ANSI SEMI standard G30-88. Copyright © 2008–2011, Texas Instruments Incorporated Submit Documentation Feedback 5 Product Folder Link(s): ADS1246 ADS1247 ADS1248
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