Datasheet ADE7768 (Analog Devices) - 4
| Manufacturer | Analog Devices |
| Description | Energy Metering IC with Integrated Oscillator and Positive Power Accumulation |
| Pages / Page | 20 / 4 — ADE7768. Parameter Value. Unit. Test. Conditions/Comments. TIMING … |
| Revision | A |
| File Format / Size | PDF / 408 Kb |
| Document Language | English |
ADE7768. Parameter Value. Unit. Test. Conditions/Comments. TIMING CHARACTERISTICS. Table 2. Parameter. Specifications
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ADE7768 Parameter Value Unit Test Conditions/Comments
POWER SUPPLY For specified performance VDD 4.75 V min 5 V – 5% 5.25 V max 5 V + 5% IDD 5 mA max Typically 4 mA 1 See the Terminology section for an explanation of specifications. 2 See the figures in the Typical Performance Characteristics section. 3 Sample tested during initial release and after any redesign or process change that may affect this parameter.
TIMING CHARACTERISTICS
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. Sample tested during initial release and after any redesign or process change that may affect this parameter. See Figure 2.
Table 2. Parameter Specifications Unit Test Conditions/Comments
t 1 1 120 ms F1 and F2 pulse width (logic low) t2 See Table 6 sec Output pulse period. See the Transfer Function section. t3 1/2 t2 sec Time between the F1 and F2 falling edges. t 1, 2 4 90 ms CF pulse width (logic high). t5 See Table 7 sec CF pulse period. See the Transfer Function section. t6 2 μs Minimum time between the F1 and F2 pulses. 1 The pulse widths of F1, F2, and CF are not fixed for higher output frequencies. See the Frequency Outputs section. 2 The CF pulse is always 35 μs in high frequency mode. See the Frequency Outputs section and Table 7.
t1 F1 t6 t2 F2 t3 t t 4 5 CF
05331-002 Figure 2. Timing Diagram for Frequency Outputs Rev. A | Page 4 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
ADE7768 Parameter Value Unit Test Conditions/Comments
POWER SUPPLY For specified performance VDD 4.75 V min 5 V – 5% 5.25 V max 5 V + 5% IDD 5 mA max Typically 4 mA 1 See the Terminology section for an explanation of specifications. 2 See the figures in the Typical Performance Characteristics section. 3 Sample tested during initial release and after any redesign or process change that may affect this parameter.
TIMING CHARACTERISTICS
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. Sample tested during initial release and after any redesign or process change that may affect this parameter. See Figure 2.
Table 2. Parameter Specifications Unit Test Conditions/Comments
t 1 1 120 ms F1 and F2 pulse width (logic low) t2 See Table 6 sec Output pulse period. See the Transfer Function section. t3 1/2 t2 sec Time between the F1 and F2 falling edges. t 1, 2 4 90 ms CF pulse width (logic high). t5 See Table 7 sec CF pulse period. See the Transfer Function section. t6 2 μs Minimum time between the F1 and F2 pulses. 1 The pulse widths of F1, F2, and CF are not fixed for higher output frequencies. See the Frequency Outputs section. 2 The CF pulse is always 35 μs in high frequency mode. See the Frequency Outputs section and Table 7.
t1 F1 t6 t2 F2 t3 t t 4 5 CF
05331-002 Figure 2. Timing Diagram for Frequency Outputs Rev. A | Page 4 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
