Datasheet AD7817, AD7818 (Analog Devices) - 4
| Manufacturer | Analog Devices |
| Description | Temperature Sensor (On Chip) 4-Channel, 9 µs, 10-Bit ADC |
| Pages / Page | 20 / 4 — AD7817/AD7818. Data Sheet. Parameter A. Version1 B. Version1 S. Version1 … |
| Revision | E |
| File Format / Size | PDF / 351 Kb |
| Document Language | English |
AD7817/AD7818. Data Sheet. Parameter A. Version1 B. Version1 S. Version1 U. nit. Test. Conditions/Comments
Model Line for this Datasheet
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AD7817/AD7818 Data Sheet Parameter A Version1 B Version1 S Version1 U nit Test Conditions/Comments
POWER REQUIREMENTS (AD7817 ONLY) VDD 5.5 5.5 5.5 V max For specified performance 2.7 2.7 2.7 V min IDD Logic inputs = 0 V or VDD Normal Operation 2 2 2 mA max 1.6 mA typical Using External Reference 1.75 1.75 1.75 mA max 2.5 V external reference connected Power-Down (VDD = 5 V) 10 10 12.5 μA max 5.5 μA typical Power-Down (VDD = 3 V) 4 4 4.5 μA max 2 μA typical Auto Power-Down Mode VDD = 3 V 10 SPS Throughput Rate 6.4 6.4 6.4 μW typ See the Power vs. Throughput section for description of power 1 kSPS Throughput Rate 48.8 48.8 48.8 μW typ dissipation in auto power-down mode 10 kSPS Throughput Rate 434 434 434 μW typ Power-Down 12 12 13.5 μW max Typically 6 μW DYNAMIC PERFORMANCE (AD7818 ONLY)6 Sample rate = 100 kSPS, any channel, fIN = 20 kHz Signal-to-(Noise + Distortion) Ratio2 57 dB min Total Harmonic Distortion2 –65 dB max −75 dB typical Peak Harmonic or Spurious Noise2 –67 dB typ −75 dB typical Intermodulation Distortion2 fa = 19.9 kHz, fb = 20.1 kHz Second-Order Terms –67 dB typ Third-Order Terms –67 dB typ Channel-to-Channel Isolation2 –80 dB typ fIN = 20 kHz DC ACCURACY (AD7818 ONLY)6 Any channel Resolution 10 Bits Minimum Resolution for Which No 10 Bits Missing Codes are Guaranteed Relative Accuracy2 ±1 LSB max Differential Nonlinearity2 ±1 LSB max Gain Error2 ±10 LSB max Offset Error2 ±4 LSB max TEMPERATURE SENSOR (AD7818 ONLY)6 Measurement Error Internal reference VREF = 2.5 V Ambient Temperature 25°C ±2 °C max TMIN to TMAX ±3 °C max Measurement Error On-chip reference Ambient Temperature 25°C ±2 °C max TMIN to TMAX ±3 °C max Temperature Resolution 1/4 °C/LSB ON-CHIP REFERENCE (AD7818 ONLY)5 Nominal 2.5 V Temperature Coefficient3 30 ppm/°C typ CONVERSION RATE (AD7818 ONLY)6 Track-and-Hold Acquisition Time4 400 ns max Source impedance < 10 Ω Conversion Time Temperature Sensor 27 μs max Channel 1 9 μs max Rev. E | Page 4 of 20 Document Outline FEATURES APPLICATIONS FUNCTIONAL BLOCK DIAGRAMS GENERAL DESCRIPTION PRODUCT HIGHLIGHTS TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS TIMING CHARACTERISTICS ABSOLUTE MAXIMUM RATINGS ESD CAUTION PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS TERMINOLOGY CONTROL BYTE Address Register Overtemperature Register CIRCUIT INFORMATION CONVERTER DETAILS TYPICAL CONNECTION DIAGRAM ANALOG INPUTS Analog Input DC Acquisition Time AC Acquisition Time ON-CHIP REFERENCE ADC TRANSFER FUNCTION TEMPERATURE MEASUREMENT TEMPERATURE MEASUREMENT ERROR DUE TO REFERENCE ERROR SELF-HEATING CONSIDERATIONS OPERATING MODES Mode 1 Mode 2 POWER vs. THROUGHPUT AD7817 SERIAL INTERFACE Read Operation Write Operation Simplifying the Serial Interface AD7818 SERIAL INTERFACE MODE Read Operation Write Operation OUTLINE DIMENSIONS ORDERING GUIDE
AD7817/AD7818 Data Sheet Parameter A Version1 B Version1 S Version1 U nit Test Conditions/Comments
POWER REQUIREMENTS (AD7817 ONLY) VDD 5.5 5.5 5.5 V max For specified performance 2.7 2.7 2.7 V min IDD Logic inputs = 0 V or VDD Normal Operation 2 2 2 mA max 1.6 mA typical Using External Reference 1.75 1.75 1.75 mA max 2.5 V external reference connected Power-Down (VDD = 5 V) 10 10 12.5 μA max 5.5 μA typical Power-Down (VDD = 3 V) 4 4 4.5 μA max 2 μA typical Auto Power-Down Mode VDD = 3 V 10 SPS Throughput Rate 6.4 6.4 6.4 μW typ See the Power vs. Throughput section for description of power 1 kSPS Throughput Rate 48.8 48.8 48.8 μW typ dissipation in auto power-down mode 10 kSPS Throughput Rate 434 434 434 μW typ Power-Down 12 12 13.5 μW max Typically 6 μW DYNAMIC PERFORMANCE (AD7818 ONLY)6 Sample rate = 100 kSPS, any channel, fIN = 20 kHz Signal-to-(Noise + Distortion) Ratio2 57 dB min Total Harmonic Distortion2 –65 dB max −75 dB typical Peak Harmonic or Spurious Noise2 –67 dB typ −75 dB typical Intermodulation Distortion2 fa = 19.9 kHz, fb = 20.1 kHz Second-Order Terms –67 dB typ Third-Order Terms –67 dB typ Channel-to-Channel Isolation2 –80 dB typ fIN = 20 kHz DC ACCURACY (AD7818 ONLY)6 Any channel Resolution 10 Bits Minimum Resolution for Which No 10 Bits Missing Codes are Guaranteed Relative Accuracy2 ±1 LSB max Differential Nonlinearity2 ±1 LSB max Gain Error2 ±10 LSB max Offset Error2 ±4 LSB max TEMPERATURE SENSOR (AD7818 ONLY)6 Measurement Error Internal reference VREF = 2.5 V Ambient Temperature 25°C ±2 °C max TMIN to TMAX ±3 °C max Measurement Error On-chip reference Ambient Temperature 25°C ±2 °C max TMIN to TMAX ±3 °C max Temperature Resolution 1/4 °C/LSB ON-CHIP REFERENCE (AD7818 ONLY)5 Nominal 2.5 V Temperature Coefficient3 30 ppm/°C typ CONVERSION RATE (AD7818 ONLY)6 Track-and-Hold Acquisition Time4 400 ns max Source impedance < 10 Ω Conversion Time Temperature Sensor 27 μs max Channel 1 9 μs max Rev. E | Page 4 of 20 Document Outline FEATURES APPLICATIONS FUNCTIONAL BLOCK DIAGRAMS GENERAL DESCRIPTION PRODUCT HIGHLIGHTS TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS TIMING CHARACTERISTICS ABSOLUTE MAXIMUM RATINGS ESD CAUTION PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS TERMINOLOGY CONTROL BYTE Address Register Overtemperature Register CIRCUIT INFORMATION CONVERTER DETAILS TYPICAL CONNECTION DIAGRAM ANALOG INPUTS Analog Input DC Acquisition Time AC Acquisition Time ON-CHIP REFERENCE ADC TRANSFER FUNCTION TEMPERATURE MEASUREMENT TEMPERATURE MEASUREMENT ERROR DUE TO REFERENCE ERROR SELF-HEATING CONSIDERATIONS OPERATING MODES Mode 1 Mode 2 POWER vs. THROUGHPUT AD7817 SERIAL INTERFACE Read Operation Write Operation Simplifying the Serial Interface AD7818 SERIAL INTERFACE MODE Read Operation Write Operation OUTLINE DIMENSIONS ORDERING GUIDE
