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AD7785 Datasheet(PDF) 3 Page - Analog Devices |
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AD7785 Datasheet(HTML) 3 Page - Analog Devices |
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3 / 32 page  AD7785 Rev. 0 | Page 3 of 32 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. Parameter AD7785B1 Unit Test Conditions/Comments ADC CHANNEL Output Update Rate 4.17 to 470 Hz nom No Missing Codes2 20 Bits min Resolution See Output Noise and Resolution Specifications Output Noise and Update Rates See Output Noise and Resolution Specifications 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 ±1 nA max Gain = 1 or 2, update rate < 100 Hz ±250 pA max Gain = 4 to 128, update rate < 100 Hz 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 Internal Clock @ 50 Hz, 60 Hz 65 dB min 80 dB typ, 50 ± 1 Hz, 60 ± 1 Hz, FS[3:0] = 10106 @ 50 Hz 80 dB min 90 dB typ, 50 ± 1 Hz, FS[3:0] = 10016 @ 60 Hz 90 dB min 100 dB typ, 60 ± 1 Hz, FS[3:0] = 10006 External Clock @ 50 Hz, 60 Hz 80 dB min 90 dB typ, 50 ± 1 Hz, 60 ± 1 Hz, FS[3:0] = 10106 @ 50 Hz 94 dB min 100 dB typ, 50 ± 1 Hz, FS[3:0] = 10016 @ 60 Hz 90 dB min 100 dB typ, 60 ± 1 Hz, FS[3:0] = 10006 Common-Mode Rejection @ DC 100 dB min AIN = 1 V/gain, gain ≥ 4 @ 50 Hz, 60 Hz2 100 dB min 50 ± 1 Hz, 60 ± 1 Hz, FS[3:0] = 10106 @ 50 Hz, 60 Hz2 100 dB min 50 ± 1 Hz (FS[3:0] = 1001)6, 60 ± 1 Hz (FS[3:0] = 1000)6 |
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