Datasheet ADE7768 (Analog Devices) - 3

link to page 3 link to page 11 link to page 6 link to page 8 link to page 8 link to page 20
ADE7768 SPECIFICATIONS
VDD = 5 V ± 5%, AGND = DGND = 0 V, on-chip reference, RCLKIN = 6.2 kΩ, 0.5% ± 50 ppm/°C, TMIN to TMAX = −40°C to +85°C, unless otherwise noted.
Table 1. Parameter Value Unit Test Conditions/Comments
ACCURACY1, 2 Measurement Error on Channel V1 0.1 % reading typ Channel V2 with full-scale signal (±165 mV), 25°C over a dynamic range 500 to 1, line frequency = 45 Hz to 65 Hz Phase Error1 Between Channels V1 Phase Lead 37° (PF = 0.8 Capacitive) ±0.1 Degrees (°) max V1 Phase Lag 60° (PF = 0.5 Inductive) ±0.1 Degrees (°) max AC Power Supply Rejection1 Output Frequency Variation (CF) 0.2 % reading typ S0 = S1 = 1, V1 = 21.2 mV rms, V2 = 116.7 mV rms @ 50 Hz, ripple on VDD of 200 mV rms @ 100 Hz DC Power Supply Rejection1 Output Frequency Variation (CF) ±0.3 % reading typ S0 = S1 = 1, V1 = 21.2 mV rms, V2 = 116.7 mV rms, VDD = 5 V ± 250 mV ANALOG INPUTS See the Analog Inputs section Channel V1 Maximum Signal Level ±30 mV max V1P and V1N to AGND Channel V2 Maximum Signal Level ±165 mV max V2P and V2N to AGND Input Impedance (DC) 320 kΩ min OSC = 450 kHz, RCLKIN = 6.2 kΩ, 0.5% ± 50 ppm/°C Bandwidth (–3 dB) 7 kHz nominal OSC = 450 kHz, RCLKIN = 6.2 kΩ, 0.5% ± 50 ppm/°C ADC Offset Error1, 2 ±18 mV max See the Terminology and the Typical Performance Characteristics sections Gain Error1 ±4 % ideal typ External 2.5 V reference, V1 = 21.2 mV rms, V2 = 116.7 mV rms OSCILLATOR FREQUENCY (OSC) 450 kHz nominal RCLKIN = 6.2 kΩ, 0.5% ± 50 ppm/°C Oscillator Frequency Tolerance1 ±12 % reading typ Oscillator Frequency Stability1 ±30 ppm/°C typ REFERENCE INPUT REFIN/OUT Input Voltage Range 2.65 V max 2.45 V nominal 2.25 V min 2.45 V nominal Input Capacitance 10 pF max ON-CHIP REFERENCE 2.45 V nominal Reference Error ±200 mV max Temperature Coefficient ±20 ppm/°C typ LOGIC INPUTS3 SCF, S0, S1 Input High Voltage, VINH 2.4 V min VDD = 5 V ± 5% Input Low Voltage, VINL 0.8 V max VDD = 5 V ± 5% Input Current, IIN ±1 μA max Typically 10 nA, VIN = 0 V to VDD Input Capacitance, CIN 10 pF max LOGIC OUTPUTS3 F1 and F2 Output High Voltage, VOH 4.5 V min ISOURCE = 10 mA, VDD = 5 V, ISINK = 10 mA, VDD = 5 V Output Low Voltage, VOL 0.5 V max CF Output High Voltage, VOH 4 V min ISOURCE = 5 mA, VDD = 5 V, ISINK = 5 mA, VDD = 5 V Output Low Voltage, VOL 0.5 V max Frequency Output Error1, 2 (CF) ±10 % ideal typ External 2.5 V reference, V1 = 21.2 mV rms, V2 = 116.7 mV rms Rev. A | Page 3 of 20 Document Outline FEATURES GENERAL DESCRIPTION FUNCTIONAL BLOCK DIAGRAM SPECIFICATIONS TIMING CHARACTERISTICS ABSOLUTE MAXIMUM RATINGS ESD CAUTION TERMINOLOGY PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS FUNCTIONAL DESCRIPTION THEORY OF OPERATION Power Factor Considerations Nonsinusoidal Voltage and Current ANALOG INPUTS Channel V1 (Current Channel) Channel V2 (Voltage Channel) Typical Connection Diagrams POWER SUPPLY MONITOR HPF and Offset Effects Digital-to-Frequency Conversion Connecting to a Microcontroller for Energy Measurement Power Measurement Considerations INTERNAL OSCILLATOR (OSC) TRANSFER FUNCTION Frequency Outputs F1 and F2 Example Frequency Output CF SELECTING A FREQUENCY FOR AN ENERGY METER APPLICATION Frequency Outputs NO-LOAD THRESHOLD NEGATIVE POWER INFORMATION EVALUATION BOARD AND REFERENCE DESIGN BOARD OUTLINE DIMENSIONS ORDERING GUIDE