ADE7769 View Datasheet(PDF) - Analog Devices

Part Name

Description

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ADE7769

Energy Metering IC with Integrated Oscillator and No-Load Indication

Analog Devices 

ADE7769

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS

VDD 1

V2P 2

16 F1

15 F2

V2N 3 ADE7769 14 CF

V1N 4 TOP VIEW 13 DGND

V1P 5 (Not to Scale) 12 REVP

AGND 6

11 RCLKIN

REFIN/OUT 7

SCF 8

10 S0

9 S1

Figure 3. Pin Configuration

Table 4. Pin Function Descriptions

Pin No. Mnemonic Description

1

VDD

2, 3

V2P, V2N

4, 5

V1N, V1P

6

AGND

7

REFIN/OUT

8

SCF

9, 10 S1, S0

11

RCLKIN

Power Supply. This pin provides the supply voltage for the circuitry in the ADE7769. The supply voltage

should be maintained at 5 V ± 5% for specified operation. This pin should be decoupled with a 10 μF

capacitor in parallel with a 100 nF ceramic capacitor.

Analog Inputs for Channel V2 (Voltage Channel). These inputs provide a fully differential input pair. The

maximum differential input voltage is ±165 mV for specified operation. Both inputs have internal ESD

protection circuitry; an overvoltage of ±6 V can be sustained on these inputs without risk of permanent

damage.

Analog Inputs for Channel V1 (Current Channel). These inputs are fully differential voltage inputs with a

maximum signal level of ±30 mV with respect to the V1N pin for specified operation. Both inputs have

internal ESD protection circuitry and, in addition, an overvoltage of ±6 V can be sustained on these inputs

without risk of permanent damage.

This pin provides the ground reference for the analog circuitry in the ADE7769, that is, the ADCs and

reference. This pin should be tied to the analog ground plane of the PCB. The analog ground plane is the

ground reference for all analog circuitry, such as antialiasing filters, current and voltage sensors, and so forth.

For accurate noise suppression, the analog ground plane should be connected to the digital ground plane at

only one point. A star ground configuration helps to keep noisy digital currents away from the analog

circuits.

This pin provides access to the on-chip voltage reference. The on-chip reference has a nominal value of 2.45 V

and a typical temperature coefficient of 20 ppm/°C. An external reference source may also be connected at

this pin. In either case, this pin should be decoupled to AGND with a 1 μF tantalum capacitor and a 100 nF

ceramic capacitor. The internal reference cannot be used to drive an external load.

Select Calibration Frequency. This logic input is used to select the frequency on the calibration output CF. See

Table 7.

These logic inputs are used to select one of four possible frequencies for the digital-to-frequency conversion.

With this logic input, designers have greater flexibility when designing an energy meter. See the Selecting a

Frequency for an Energy Meter Application section.

To enable the internal oscillator as a clock source to the chip, a precise low temperature drift resistor at a

nominal value of 6.2 kΩ must be connected from this pin to DGND.

12

REVP

13

DGND

14

CF

15, 16 F2, F1

This logic output goes high when negative power is detected, that is, when the phase angle between the

voltage and current signals is greater than 90°. This output is not latched and is reset when positive power is

once again detected. The output goes high or low at the same time that a pulse is issued on CF.

This pin provides the ground reference for the digital circuitry in the ADE7769, that is, the multiplier, filters,

and digital-to-frequency converter. This pin should be tied to the digital ground plane of the PCB. The digital

ground plane is the ground reference for all digital circuitry, such as the counters (mechanical and digital),

MCUs, and indicator LEDs. For accurate noise suppression, the analog ground plane should be connected to

the digital ground plane at one point only—a star ground.

Calibration Frequency Logic Output. The CF logic output provides instantaneous real power information. This

output is intended for calibration purposes. See the SCF pin description. This output stays high when the part

is in a no-load condition.

Low Frequency Logic Outputs. F1 and F2 supply average real power information. The logic outputs can be

used to directly drive electromechanical counters and 2-phase stepper motors. See the Transfer Function

section.

Rev. A | Page 7 of 20

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