Datasheet AD7781 (Analog Devices) - 5
| Manufacturer | Analog Devices |
| Description | 20-Bit, Pin-Programmable, Ultralow Power Sigma-Delta ADC |
| Pages / Page | 17 / 5 — AD7781. Parameter Min. Typ. Max. Unit. Test. Conditions/Comments |
| File Format / Size | PDF / 329 Kb |
| Document Language | English |
AD7781. Parameter Min. Typ. Max. Unit. Test. Conditions/Comments
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AD7781 Parameter Min Typ Max Unit Test Conditions/Comments
INTERNAL CLOCK Frequency 64 − 3% 64 + 3% kHz Duty Cycle 50:50 % LOGIC INPUTS SCLK, FILTER, GAIN, PDRST2 Input Low Voltage, VINL 0.4 V DVDD = 3 V 0.8 V DVDD = 5 V Input High Voltage, VINH 1.8 V DVDD = 3 V 2.4 V DVDD = 5 V SCLK (Schmitt-Triggered Input) Hysteresis2 100 mV DVDD = 3 V 140 mV DVDD = 5 V Input Currents ±2 μA VIN = DVDD or GND Input Capacitance 10 pF All digital inputs 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 Current ±2 μA Floating-State Output Capacitance 10 pF Data Output Coding Offset binary POWER REQUIREMENTS3 Power Supply Voltage AVDD to GND 2.7 5.25 V DVDD to GND 2.7 5.25 V Power Supply Currents IDD Current Gain = 1 115 μA AVDD = 3 V 130 160 μA AVDD = 5 V Gain = 128 (B Grade) 300 μA AVDD = 3 V 350 400 μA AVDD = 5 V Gain = 128 (C Grade) 330 μA AVDD = 3 V 420 500 μA AVDD = 5 V IDD (Power-Down/Reset Mode) 10 μA 1 Temperature range is −40°C to +105°C. 2 This specification is not production tested but is supported by characterization data at initial product release. 3 Digital inputs are equal to DVDD or GND. Rev. 0 | Page 4 of 16 Document Outline FEATURES APPLICATIONS FUNCTIONAL BLOCK DIAGRAM GENERAL DESCRIPTION TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS TIMING CHARACTERISTICS Circuit and Timing Diagrams ABSOLUTE MAXIMUM RATINGS THERMAL RESISTANCE ESD CAUTION PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS OUTPUT NOISE AND RESOLUTION THEORY OF OPERATION FILTER, DATA RATE, AND SETTLING TIME GAIN POWER-DOWN/RESET (PDRST) ANALOG INPUT CHANNEL BIPOLAR CONFIGURATION DATA OUTPUT CODING REFERENCE BRIDGE POWER-DOWN SWITCH DIGITAL INTERFACE APPLICATIONS INFORMATION WEIGH SCALES AD7781 PERFORMANCE IN A WEIGH SCALE SYSTEM EMI RECOMMENDATIONS GROUNDING AND LAYOUT OUTLINE DIMENSIONS ORDERING GUIDE
AD7781 Parameter Min Typ Max Unit Test Conditions/Comments
INTERNAL CLOCK Frequency 64 − 3% 64 + 3% kHz Duty Cycle 50:50 % LOGIC INPUTS SCLK, FILTER, GAIN, PDRST2 Input Low Voltage, VINL 0.4 V DVDD = 3 V 0.8 V DVDD = 5 V Input High Voltage, VINH 1.8 V DVDD = 3 V 2.4 V DVDD = 5 V SCLK (Schmitt-Triggered Input) Hysteresis2 100 mV DVDD = 3 V 140 mV DVDD = 5 V Input Currents ±2 μA VIN = DVDD or GND Input Capacitance 10 pF All digital inputs 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 Current ±2 μA Floating-State Output Capacitance 10 pF Data Output Coding Offset binary POWER REQUIREMENTS3 Power Supply Voltage AVDD to GND 2.7 5.25 V DVDD to GND 2.7 5.25 V Power Supply Currents IDD Current Gain = 1 115 μA AVDD = 3 V 130 160 μA AVDD = 5 V Gain = 128 (B Grade) 300 μA AVDD = 3 V 350 400 μA AVDD = 5 V Gain = 128 (C Grade) 330 μA AVDD = 3 V 420 500 μA AVDD = 5 V IDD (Power-Down/Reset Mode) 10 μA 1 Temperature range is −40°C to +105°C. 2 This specification is not production tested but is supported by characterization data at initial product release. 3 Digital inputs are equal to DVDD or GND. Rev. 0 | Page 4 of 16 Document Outline FEATURES APPLICATIONS FUNCTIONAL BLOCK DIAGRAM GENERAL DESCRIPTION TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS TIMING CHARACTERISTICS Circuit and Timing Diagrams ABSOLUTE MAXIMUM RATINGS THERMAL RESISTANCE ESD CAUTION PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS OUTPUT NOISE AND RESOLUTION THEORY OF OPERATION FILTER, DATA RATE, AND SETTLING TIME GAIN POWER-DOWN/RESET (PDRST) ANALOG INPUT CHANNEL BIPOLAR CONFIGURATION DATA OUTPUT CODING REFERENCE BRIDGE POWER-DOWN SWITCH DIGITAL INTERFACE APPLICATIONS INFORMATION WEIGH SCALES AD7781 PERFORMANCE IN A WEIGH SCALE SYSTEM EMI RECOMMENDATIONS GROUNDING AND LAYOUT OUTLINE DIMENSIONS ORDERING GUIDE
