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AD7788 Datasheet(PDF) 4 Page - Analog Devices |
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AD7788 Datasheet(HTML) 4 Page - Analog Devices |
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4 / 20 page  AD7788/AD7789 Rev. B | Page 4 of 20 AD7788 VDD = 2.5 V to 5.25 V (B grade); VDD = 2.7 V to 5.25 V (A grade); REFIN(+) = 2.5 V; REFIN(−) = GND; GND = 0 V; all specifications TMIN to TMAX, unless otherwise noted. Table 2. Parameter1 AD7788 A, AD7788B Unit Test Conditions/Comments ADC CHANNEL SPECIFICATION Output Update Rate 16.6 Hz nom ADC CHANNEL No Missing Codes2 16 Bits min Resolution 16 Bits p-p Output Noise 1.5 μV rms typ Integral Nonlinearity ±15 ppm of FSR max B grade ±50 ppm of FSR max A grade2 Offset Error ±3 μV typ Offset Error Drift vs. Temperature ±10 nV/°C typ Full-Scale Error3 ±10 μV typ Gain Drift vs. Temperature ±0.5 ppm/°C typ Power Supply Rejection 90 dB min B grade 90 dB typ A grade ANALOG INPUTS Differential Input Voltage Ranges ±REFIN V nom REFIN = REFIN(+) − REFIN(−) Absolute AIN Voltage Limits2 GND − 30 mV V min VDD + 30 mV V max Analog Input Current Input current varies with input voltage Average Input Current2 ±400 nA/V typ Average Input Current Drift ±50 pA/V/°C typ Normal-Mode Rejection2 @ 50 Hz, 60 Hz 65 dB min B grade, 50 Hz ± 1 Hz, 60 Hz ± 1 Hz 60 dB min A grade, 50 Hz ± 1 Hz, 60 Hz ± 1 Hz Common-Mode Rejection AIN = 1 V @ DC 90 dB min B grade, 100 dB typ 90 dB typ A grade @ 50 Hz, 60 Hz2 100 dB min B grade, 50 Hz ± 1 Hz, 60 Hz ± 1 Hz 100 dB typ A grade, 50 Hz ± 1 Hz, 60 Hz ± 1 Hz REFERENCE INPUT REFIN Voltage 2.5 V nom REFIN = REFIN(+) − REFIN(−) Reference Voltage Range2 0.1 V min VDD V max Absolute REFIN Voltage Limits2 GND − 30 mV V min VDD + 30 mV V max Average Reference Input Current 0.5 μA/V typ Average Reference Input Current Drift ±0.03 nA/V/°C typ Normal-Mode Rejection2 @ 50 Hz, 60 Hz 65 dB min B grade, 50 Hz ± 1 Hz, 60 Hz ± 1 Hz 60 dB min A grade Common-Mode Rejection AIN = 1 V @ DC 100 dB typ @ 50 Hz, 60 Hz 110 dB typ 50 Hz ± 1 Hz, 60 Hz ± 1 Hz 1 Temperature range: B grade: −40°C to +105°C; A grade: −40°C to +85°C. 2 Specification is not production tested but is supported by characterization data at initial product release. 3 Full-scale error applies to both positive and negative full scale and applies at the factory calibration conditions (VDD = 4 V). |
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