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AD7709 数据表(PDF) 3 Page - Analog Devices |
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AD7709 数据表(HTML) 3 Page - Analog Devices |
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3 / 32 page  REV. A –3– AD7709 SPECIFICATIONS1 (VDD = 2.7 V to 3.6 V or 4.75 V to 5.25 V, REFIN(+) = 2.5 V; REFIN(–) = GND; GND = 0 V; XTAL1/XTAL2 = 32.768 kHz Crystal; all specifications TMIN to TMAX, unless otherwise noted.) Parameter AD7709A, AD7709B Unit Test Conditions ADC CHANNEL SPECIFICATION Output Update Rate 5.4 Hz min 0.732 ms Increments 105 Hz max ADC CHANNEL No Missing Codes 2 16 Bits min 20 Hz Update Rate Resolution 13 Bits p-p ±20 mV Range, 20 Hz Update Rate 16 Bits p-p ±2.56 V Range, 20 Hz Update Rate Output Noise and Update Rates See Tables II to V Integral Nonlinearity 2 ±30 ppm of FSR max Typically 2 ppm FSR REFIN GAIN = ¥ 21 024 . Offset Error ±3 mV typ Offset Error Drift vs. Temperature ±10 nV/ ∞C typ Full-Scale Error 3 ±0.75 LSB typ B Grade, VDD = 4 V ±0.2 % of FS typ A Grade Gain Drift vs. Temperature ±0.5 ppm/ ∞C typ Power Supply Rejection (PSR) 85 dB typ Input Range = ±2.56 V 100 dB typ on ±20 mV Range ANALOG INPUTS Differential Input Voltage Ranges ±¥ 1 024 . REFIN GAIN V nom REFIN = REFIN(+) – REFIN(–) GAIN = 1 to 128 ADC Range Matching ±2 mV typ Input Voltage = 19 mV on All Ranges Absolute AIN1–AIN4 Voltage Limits 2 GND + 100 mV V min VDD – 100 mV V max AIN1–AIN4 Analog Input Current DC Input Current 2 ±1 nA max DC Input Current Drift ±5 pA / ∞C typ Absolute AINCOM Voltage Limits 2 GND – 30 mV V min VDD + 30 mV V max AINCOM Analog Input Current Pseudo-Differential Mode of Operation DC Input Current ±125 nA/V typ Input Current Varies with Input Range DC Input Current Drift ±2 pA/V/ ∞C typ Normal-Mode Rejection 2, 4 @ 50 Hz 100 dB min 50 Hz ± 1Hz, 16.65 Hz Update Rate, SF = 82 @ 60 Hz 100 dB min 60 Hz ± 1 Hz, 20 Hz Update Rate, SF = 68 Common-Mode Rejection @ DC 100 dB typ Input Range = ±2.56 V, AIN = 1 V 110 dB typ on ±20 mV Range @ 50 Hz 2 100 dB min 50 Hz ± 1 Hz, Range = ±2.56 V, AIN = 1 V @ 60 Hz 2 100 dB min 60 Hz ± 1 Hz, Range = ±2.56 V, AIN = 1 V REFERENCE INPUTS (REFIN1 and REFIN2) REFIN Voltage 2.5 V nom REFIN = REFIN(+) – REFIN(–) REFIN Voltage Range 2 1V min VDD V max Absolute REFIN Voltage Limits 2 GND – 30 mV V min VDD + 30 mV V max Average Reference Input Current 0.5 mA/V typ Average Reference Input Current Drift ±0.01 nA/V/ ∞C typ Normal-Mode Rejection 2, 4 @ 50 Hz 100 dB min 50 Hz ± 1 Hz, SF = 82 @ 60 Hz 100 dB min 60 Hz ± 1 Hz, SF = 68 Common-Mode Rejection @ DC 110 dB typ Input Range = ±2.56 V, AIN = 1 V @ 50 Hz 110 dB typ 50 Hz ± 1 Hz, Range = 2.56 V, AIN = 1 V @ 60 Hz 110 dB typ 60 Hz ± 1 Hz, Range = 2.56 V, AIN = 1 V See Notes on page 5. |
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