Datasheet AD7194 (Analog Devices) - 6

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Data Sheet AD7194 Parameter Min Typ Max Unit Test Conditions/Comments1
REFERENCE INPUT REFIN Voltage 1 AVDD V REFIN = REFINx(+) − REFINx(−), the differential input must be limited to ±(AVDD − 1.25 V)/gain when gain > 1 Absolute REFIN Voltage AGND − 0.05 AVDD + 0.05 V Limits2 Average Reference Input 4.5 µA/V Current Average Reference Input ±0.03 nA/V/°C External clock Current Drift ±1.3 nA/V/°C Internal clock Normal Mode Rejection2 Same as for analog inputs Common-Mode 100 dB Rejection Reference Detect Levels 0.3 0.6 V TEMPERATURE SENSOR Accuracy ±2 °C Applies after user calibration at 25°C Sensitivity 2815 Codes/°C Bipolar mode BURNOUT CURRENTS AIN Current 500 nA Analog inputs must be buffered and chop disabled DIGITAL OUTPUTS (P0 to P3) Output High Voltage, VOH AVDD − 0.6 V AVDD = 3 V, ISOURCE = 100 μA 4 V AVDD = 5 V, ISOURCE = 200 μA Output Low Voltage, VOL 0.4 V AVDD = 3 V, ISINK = 100 μA 0.4 V AVDD = 5 V, ISINK = 800 μA Floating-State Leakage −100 +100 nA Current2 Floating-State Output 10 pF Capacitance INTERNAL/EXTERNAL CLOCK Internal Clock Frequency 4.72 5.12 MHz Duty Cycle 50:50 % External Clock/Crystal Frequency 2.4576 4.9152 5.12 MHz Input Low Voltage, VINL 0.8 V DVDD = 5 V 0.4 V DVDD = 3 V Input High Voltage, VINH 2.5 V DVDD = 3 V 3.5 V DVDD = 5 V Input Current −10 +10 µA LOGIC INPUTS Input High Voltage, V 2 INH 2 V Input Low Voltage, V 2 INL 0.8 V Hysteresis2 0.1 0.25 V Input Currents −10 +10 µA LOGIC OUTPUT (DOUT/RDY) Output High Voltage, V 2 OH DVDD − 0.6 V DVDD = 3 V, ISOURCE = 100 µA 4 V DVDD = 5 V, ISOURCE = 200 µA Output Low Voltage, V 2 OL 0.4 V DVDD = 3 V, ISINK = 100 µA 0.4 V DVDD = 5 V, ISINK = 1.6 mA Floating-State Leakage −10 +10 µA Current Floating-State Output 10 pF Capacitance Data Output Coding Offset binary Rev. B | Page 5 of 54 Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION FUNCTIONAL BLOCK DIAGRAM TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS TIMING CHARACTERISTICS Circuit and Timing Diagrams ABSOLUTE MAXIMUM RATINGS THERMAL RESISTANCE ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS RMS NOISE AND RESOLUTION SINC4 CHOP DISABLED SINC3 CHOP DISABLED FAST SETTLING ON-CHIP REGISTERS COMMUNICATIONS REGISTER RS2, RS1, RS0 = 000 STATUS REGISTER RS2, RS1, RS0 = 000; Power-On/Reset = 0x80 MODE REGISTER RS2, RS1, RS0 = 001; Power-On/Reset = 0x080060 CONFIGURATION REGISTER RS2, RS1, RS0 = 010; Power-On/Reset = 0x000117 Channel Selection (Pseudo Bit = 0) DATA REGISTER RS2, RS1, RS0 = 011; Power-On/Reset = 0x000000 ID REGISTER RS2, RS1, RS0 = 100; Power-On/Reset = 0xX3 GPOCON REGISTER RS2, RS1, RS0 = 101; Power-On/Reset = 0x00 OFFSET REGISTER RS2, RS1, RS0 = 110; Power-On/Reset = 0x800000) FULL-SCALE REGISTER RS2, RS1, RS0 = 111; Power-On/Reset = 0x5XXXX0 ADC CIRCUIT INFORMATION OVERVIEW Analog Inputs Multiplexer PGA Reference Detect Burnout Currents Σ-Δ ADC and Filter Serial Interface Clock Temperature Sensor Digital Outputs Calibration ANALOG INPUT CHANNEL PROGRAMMABLE GAIN ARRAY (PGA) REFERENCE REFERENCE DETECT BIPOLAR/UNIPOLAR CONFIGURATION DATA OUTPUT CODING BURNOUT CURRENTS DIGITAL INTERFACE Single Conversion Mode Continuous Conversion Mode Continuous Read RESET SYSTEM SYNCHRONIZATION ENABLE PARITY CLOCK TEMPERATURE SENSOR LOGIC OUTPUTS CALIBRATION DIGITAL FILTER SINC4 FILTER (CHOP DISABLED) Sinc4 Output Data Rate/Settling Time Sinc4 Zero Latency Sinc4 50 Hz/60 Hz Rejection SINC3 FILTER (CHOP DISABLED) Sinc3 Output Data Rate and Settling Time Sinc3 Zero Latency Sinc3 50 Hz/60 Hz Rejection CHOP ENABLED (SINC4 FILTER) Output Data Rate and Settling Time (Sinc4 Chop Enabled) 50 Hz/60 Hz Rejection (Sinc4 Chop Enabled) CHOP ENABLED (SINC3 FILTER) Output Data Rate and Settling Time (Sinc3 Chop Enabled) 50 Hz/60 Hz Rejection (Sinc3 Chop Enabled) FAST SETTLING MODE (SINC4 FILTER) Output Data Rate and Settling Time, Sinc4 Filter 50 Hz/60 Hz Rejection, Sinc4 Filter FAST SETTLING MODE (SINC3 FILTER) Output Data Rate and Settling Time, Sinc3 Filter 50 Hz/60 Hz Rejection, Sinc3 Filter FAST SETTLING MODE (CHOP ENABLED) SUMMARY OF FILTER OPTIONS GROUNDING AND LAYOUT APPLICATIONS INFORMATION FLOWMETER OUTLINE DIMENSIONS ORDERING GUIDE