link to page 6 link to page 6 AD7191Parameter1AD7191BUnitTest Conditions/Comments Floating-State Leakage Current ±10 μA max Floating-State Output Capacitance 10 pF typ Data Output Coding Offset binary POWER REQUIREMENTS3 Power Supply Voltage AVDD − AGND 3/5.25 V min/V max DVDD − DGND 2.7/5.25 V min/V max Power Supply Currents AIDD Current 0.85 mA max 0.75 mA typical, gain = 1. 3.6 mA max 3 mA typical, gain = 8. 5 mA max 4 mA typical, gain = 64 or 128. DIDD Current 0.4 mA max 0.35 mA typical, DVDD = 3 V. 0.6 mA max 0.5 mA typical, DVDD = 5 V. 1.5 mA typ External crystal used. IDD (Power-Down Mode) 3 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 Digital inputs equal to DVDD or DGND. Rev. A | Page 5 of 20 Document Outline FEATURES INTERFACE APPLICATIONS GENERAL DESCRIPTION FUNCTIONAL BLOCK DIAGRAM TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS TIMING CHARACTERISTICS TIMING DIAGRAM ABSOLUTE MAXIMUM RATINGS ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS RMS NOISE AND RESOLUTION SPECIFICATIONS ADC CIRCUIT INFORMATION OVERVIEW FILTER, DATA RATE, AND SETTLING TIME GAIN ANALOG INPUT CHANNELS TEMPERATURE SENSOR POWER-DOWN (PDOWN) CLOCK BIPOLAR CONFIGURATION DATA OUTPUT CODING BRIDGE POWER-DOWN SWITCH REFERENCE DIGITAL INTERFACE GROUNDING AND LAYOUT APPLICATIONS INFORMATION WEIGH SCALES EMI RECOMMENDATIONS OUTLINE DIMENSIONS ORDERING GUIDE
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