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AD7719 Datasheet(PDF) 3 Page - Analog Devices |
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AD7719 Datasheet(HTML) 3 Page - Analog Devices |
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3 / 40 page  REV. 0 –3– AD7719–SPECIFICATIONS1 (AVDD = 2.7 V to 3.6 V or 4.75 V to 5.25 V, DVDD = 2.7 V to 3.6 V or 4.75 V to 5.25 V, REFIN(+) = 2.5 V; REFIN(–) = AGND; AGND = DGND = 0 V; XTAL1/XTAL2 = 32.768 kHz Crystal; all specifications TMIN to TMAX unless otherwise noted.) Parameter AD7719B Unit Test Conditions ADC CHANNEL SPECIFICATION Output Update Rate 5.4 Hz min Both Channels Synchronized 105 Hz max 0.732 ms Increments MAIN CHANNEL No Missing Codes 2 24 Bits min 20 Hz Update Rate Resolution 13 Bits p-p ±20 mV Range, 20 Hz Update Rate 18 Bits p-p ±2.56 V Range, 20 Hz Update Rate Output Noise and Update Rates See Tables II to V Integral Nonlinearity ±10 ppm of FSR max Typically 2 ppm. Offset Error 3 ± 3 µV typ Offset Error Drift vs. Temperature 4 ±10 nV/ °C typ Full-Scale Error 5, 8, 9 ±10 µV typ At the Calibrated Conditions Gain Drift vs. Temperature 4 ±0.5 ppm/ °C typ Power Supply Rejection (PSR) 80 dB min Input Range = ±2.56 V, 100 dB typ. 110 dB typ on ±20 mV Range ANALOG INPUTS Differential Input Voltage Ranges ±1.024 × REFIN1/GAIN V nom REFIN1 = REFIN1(+) – REFIN1(–) GAIN = 1 to 128. ADC Range Matching ± 2 µV typ Input Voltage = 19 mV on All Ranges Absolute AIN Voltage Limits AGND + 100 mV V min BUF = 0; Buffered Mode of Operation AVDD – 100 mV V max Analog Input Current 2 BUF = 0 DC Input Current ± 1 nA max DC Input Current Drift ± 5 pA / °C typ Absolute AIN Voltage Limits AGND – 30 mV V min BUF = 1; Unbuffered mode of operation. AVDD + 30 mV V max Analog Input Current BUF = 1. Unbuffered Mode of Operation. DC Input Current ±125 nA/V typ Input Current Varies with Input Voltage DC Input Current Drift ± 2 pA/V/ °C typ Normal-Mode Rejection 2, 6 @ 50 Hz 100 dB min 50 Hz ± 1 Hz, 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 90 dB min Input Range = ±2.56 V, AIN = 1 V. 100 dB typ. 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 INPUT (REFIN1) REFIN1 Voltage 2.5 V nom REFIN1 = REFIN1(+) – REFIN1(–) REFIN1 Voltage Range 2 1 V min AVDD V max REFIN1 Common-Mode Range AGND – 30 mV V min AVDD + 30 mV V max Reference DC Input Current 0.5 µA/V typ Reference DC Input Current Drift ±0.01 nA/V/ °C typ Normal-Mode Rejection 2, 6 @ 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 Reference Detect Levels 0.3 V min NOXREF Bit Active if VREF < 0.3 V 0.65 V max NOXREF Bit Inactive if VREF > 0.65 V AUXILIARY CHANNEL No Missing Codes 2 16 Bits min Resolution 16 Bits p-p ±2.5 V Range, 20 Hz Update Rate Output Noise and Update Rates See Tables VI and VIII Integral Nonlinearity ±15 ppm of FSR max FSR REFIN Gain = × 2 1 024 1 . |
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