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AD7794 Arkusz danych(PDF) 8 Page - Analog Devices |
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AD7794 Arkusz danych(HTML) 8 Page - Analog Devices |
8 / 21 page AD7794 Preliminary Technical Data REV.PrE 6/04 | Page 8 Parameter AD7794B Unit Test Conditions/Comments VINH, Input High Voltage 2.5 V min DVDD = 3 V Input Currents ±1 µA max VIN = DVDD or GND Input Capacitance 10 pF typ All Digital Inputs LOGIC OUTPUTS (Including CLK) VOH, Output High Voltage2 DVDD – 0.6 V min DVDD = 3 V, ISOURCE = 100 µA VOL, Output Low Voltage2 0.4 V max DVDD = 3 V, ISINK = 100 µA VOH, Output High Voltage2 4 V min DVDD = 5 V, ISOURCE = 200 µA VOL, Output Low Voltage2 0.4 V max DVDD = 5 V, ISINK = 1.6 mA (DOUT/RDY)/800 µA (CLK) Floating-State Leakage Current ±1 µA max Floating-State Output Capacitance 10 pF typ Data Output Coding Offset Binary SYSTEM CALIBRATION2 V max Full-Scale Calibration Limit 1.05 x FS V max Zero-Scale Calibration Limit -1.05 x FS Input Span 0.8 x FS V min V min 2.1 x FS V min POWER REQUIREMENTS7 Power Supply Voltage AVDD – GND 2.7/5.25 V min/max DVDD – GND 2.7/5.25 V min/max Power Supply Currents IDD Current 150 µA max 125 µA typ, Unbuffered Mode, Ext. Reference 175 µA max 150 µA typ, Buffered Mode, In-Amp Bypassed, Ext Ref 380 µA max 330 µA typ, In-Amp used, Ext. Ref 450 µA max 400 µA typ, In-Amp used, Int Ref IDD (Power-Down Mode) 1 µA max 1 Temperature Range –40°C to +105°C. 2 Specification is not production tested but is supported by characterization data at initial product release. 3 Following a self-calibration, this error will be in the order of the noise for the programmed gain and update rate selected. A system calibration will completely remove this error. 4 Recalibration at any temperature will remove these errors. 5 Full-scale error applies to both positive and negative full-scale and applies at the factory calibration conditions (AVDD = 4 V). 6 FS[3:0] are the four bits used in the mode register to select the output word rate. 7 Digital inputs equal to DVDD or GND. |
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