link to page 22 link to page 22 link to page 20 link to page 20 ADE7752/ADE7752APin No.MnemonicDescription 19 CLKIN Master Clock for ADCs and Digital Signal Processing. An external clock can be provided at this logic input. Alternatively, a parallel resonant AT crystal can be connected across CLKIN and CLKOUT to provide a clock source for the ADE7752. The clock frequency for specified operation is 10 MHz. Ceramic load capacitors between 22 pF and 33 pF should be used with the gate oscillator circuit. Refer to the crystal manufacturer’s data sheet for load capacitance requirements. 20 CLKOUT A crystal can be connected across this pin and CLKIN as described previously to provide a clock source for the ADE7752. The CLKOUT pin can drive one CMOS load when an external clock is supplied at CLKIN or when a crystal is being used. 21, 22 S0, S1 These logic inputs are used to select one of four possible frequencies for the digital-to-frequency conver- sion. This offers the designer greater flexibility when designing the energy meter. See the Selecting a Frequency for an Energy Meter Application section. 24, 23 F1, F2 Low Frequency Logic Outputs. F1 and F2 supply average real power information. The logic outputs can be used to drive electromechanical counters and two-phase stepper motors directly. See the Transfer Function section. Rev. C | Page 7 of 24 Document Outline FEATURES GENERAL DESCRIPTION FUNCTIONAL BLOCK DIAGRAM SPECIFICATIONS TIMING CHARACTERISTICS ABSOLUTE MAXIMUM RATINGS ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS TEST CIRCUIT TERMINOLOGY THEORY OF OPERATION POWER FACTOR CONSIDERATIONS NONSINUSOIDAL VOLTAGE AND CURRENT ANALOG INPUTS CURRENT CHANNELS VOLTAGE CHANNELS TYPICAL CONNECTION DIAGRAMS CURRENT CHANNEL CONNECTION VOLTAGE CHANNELS CONNECTION METER CONNECTIONS POWER SUPPLY MONITOR HPF AND OFFSET EFFECTS DIGITAL-TO-FREQUENCY CONVERSION MODE SELECTION OF THE SUM OF THE THREE ACTIVE ENERGIES POWER MEASUREMENT CONSIDERATIONS TRANSFER FUNCTION FREQUENCY OUTPUTS F1 AND F2 FREQUENCY OUTPUT CF SELECTING A FREQUENCY FOR AN ENERGY METER APPLICATION FREQUENCY OUTPUTS NO LOAD THRESHOLD NEGATIVE POWER INFORMATION OUTLINE DIMENSIONS ORDERING GUIDE
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