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AD7795BRUZ-REEL1 Scheda tecnica(PDF) 3 Page - Analog Devices |
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AD7795BRUZ-REEL1 Scheda tecnica(HTML) 3 Page - Analog Devices |
3 / 36 page AD7794/AD7795 Rev. D | Page 3 of 36 SPECIFICATIONS AVDD = 2.7 V to 5.25 V, DVDD = 2.7 V to 5.25 V, GND = 0 V, all specifications TMIN to TMAX, unless otherwise noted. Table 1. Parameter1 AD7794/AD7795 Unit Test Conditions/Comments CHOP ENABLED Output Update Rate 4.17 to 470 Hz nom Settling time = 2/output update rate No Missing Codes2 AD7794 24 Bits min fADC ≤ 242 Hz AD7795 16 Bits min Resolution See the RMS Noise and Resolution Specifications section RMS Noise and Update Rates See the RMS Noise and Resolution Specifications section Integral Nonlinearity ±15 ppm of FSR max Offset Error3 ±1 μV typ Offset Error Drift vs. Temperature4 ±10 nV/°C typ Full-Scale Error3, 5 ±10 μV typ Gain Drift vs. Temperature4 ±1 ppm/°C typ Gain = 1 to 16, external reference ±3 ppm/°C typ Gain = 32 to 128, external reference Power Supply Rejection 100 dB min AIN = 1 V/gain, gain ≥ 4, external reference ANALOG INPUTS Differential Input Voltage Ranges ±VREF/gain V nom VREF = REFIN(+) − REFIN(−), or internal reference, gain = 1 to 128 Absolute AIN Voltage Limits2 Unbuffered Mode GND − 30 mV V min Gain = 1 or 2 AVDD + 30 mV V max Buffered Mode GND + 100 mV V min Gain = 1 or 2 AVDD − 100 mV V max In-Amp Active GND + 300 mV V min Gain = 4 to 128 AVDD − 1.1 V max Common-Mode Voltage, VCM 0.5 V min VCM = (AIN(+) + AIN(−))/2, gain = 4 to 128 Analog Input Current Buffered Mode or In-Amp Active Average Input Current2 AD7794B/AD7795B ±1 nA max Gain = 1 or 2, update rate < 100 Hz ±250 pA max Gain = 4 to 128, update rate < 100 Hz ±1 nA max AIN6(+)/AIN6(−) AD7794C ±3 nA max Gain = 1 or 2, update rate < 100 Hz ±2 nA max Gain = 4 to 128, update rate < 100 Hz ±3 nA max AIN6(+)/AIN6(−) Average Input Current Drift ±2 pA/°C typ Unbuffered Mode Gain = 1 or 2 Average Input Current ±400 nA/V typ Input current varies with input voltage Average Input Current Drift ±50 pA/V/°C typ Normal Mode Rejection2, 6 Internal Clock @ 50 Hz, 60 Hz 65 dB min 80 dB typ, 50 ± 1 Hz, 60 ± 1 Hz, FS[3:0] = 1010 @ 50 Hz 80 dB min 90 dB typ, 50 ± 1 Hz, FS[3:0] = 1001 @ 60 Hz 90 dB min 100 dB typ, 60 ± 1 Hz, FS[3:0] = 1000 External Clock @ 50 Hz, 60 Hz 80 dB min 90 dB typ, 50 ± 1 Hz, 60 ± 1 Hz, FS[3:0] = 1010 @ 50 Hz 94 dB min 100 dB typ, 50 ± 1 Hz, FS[3:0] = 1001 @ 60 Hz 90 dB min 100 dB typ, 60 ± 1 Hz, FS[3:0] = 1000 |
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