ADE7757 Analog Devices, ADE7757 Datasheet - Page 4

• Manufacturer Part Number: ADE7757
• Description: Energy Metering IC with Integrated Oscillator
• Manufacturer: Analog Devices

The error associated with the energy measurement made by the
ADE7757 is defined by the following formula:
The HPF (High Pass Filter) in the current channel (Channel
V1) has a phase lead response. To offset this phase response
and equalize the phase response between channels, a phase
correction network is also placed in Channel V1. The phase
correction network matches the phase to within ±0.1° over a
range of 45 Hz to 65 Hz and ±0.2° over a range 40 Hz to 1
kHz. See Figures 19 and 20.
This quantifies the ADE7757 measurement error as a percent-
age of reading when the power supplies are varied.
For the ac PSR measurement a reading at nominal supplies
(5 V) is taken. A 200 mV rms/100 Hz signal is then introduced
onto the supplies and a second reading obtained under the
same input signal levels. Any error introduced is expressed as a
percentage of reading—see Measurement Error definition.
For the dc PSR measurement a reading at nominal supplies
(5 V) is taken. The supplies are then varied ±5% and a second
reading is obtained with the same input signal levels. Any error
introduced is again expressed as a percentage of reading.
(T
V
V
Analog Input Voltage to AGND
Reference Input Voltage to AGND . . . –0.3 V to V
Digital Input Voltage to DGND . . . . . –0.3 V to V
Digital Output Voltage to DGND . . . . –0.3 V to V
Operating Temperature Range
Storage Temperature Range . . . . . . . . . . . –65°C to +150°C
Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . +150°C
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily
accumulate on the human body and test equipment and can discharge without detection.
Although the ADE7757 features proprietary ESD protection circuitry, permanent damage may
occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD
precautions are recommended to avoid performance degradation or loss of functionality.
%
DD
DD
A
V1P, V1N, V2P and V2N . . . . . . . . . . . . . . . –6 V to +6 V
Industrial (A, B Versions) . . . . . . . . . . . . –40°C to +85°C
Error
= +25°C unless otherwise noted)
to AGND . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to +7 V
to DGND . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to +7 V
Energy
registered
True
by
ADE
Energy
PRELIMINARY TECHNICAL DATA
7757
True
Energy
DD
DD
DD
+ 0.3 V
+ 0.3 V
+ 0.3 V
100
%
– 4 –
16-Lead Plastic SOIC, Power Dissipation . . . . . . . . . 350mW
*Stresses above those listed under Absolute Maximum Ratings may cause
**JEDEC 1S Standard (2 layer) Board Data
This refers to the small dc signal (offset) associated with the
analog inputs to the ADCs. However, the HPF in Channel V1
eliminates the offset in the circuitry. Therefore, the power cal-
culation is not affected by this offset.
The frequency output error of the ADE7757 is defined as
the difference between the measured output frequency (mi-
nus the offset) and the ideal output frequency. The differ-
ence is expressed as a percentage of the ideal frequency.
The ideal frequency is obtained from the ADE7757 trans-
fer function—see Transfer Function section.
The gain error of the ADE7757 is defined as the differ-
ence between the measured output frequency (minus the
offset) and the ideal output frequency. It is measured with
a gain of 1 in channel V1. The difference is expressed as a
percentage of the ideal frequency. The ideal frequency is
obtained from the ADE7757 transfer function—see Trans-
fer Function section.
permanent damage to the device. This is a stress rating only; functional
operation of the device at these or any other conditions above those listed in the
operational sections of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect device reliability.
Lead Temperature, Soldering
JA
Vapor Phase (60 sec) . . . . . . . . . . . . . . . . . . . . . . +215°C
Infrared (15 sec) . . . . . . . . . . . . . . . . . . . . . . . . +220°C
Thermal Impedance** . . . . . . . . . . . . . . . . . 124.9°C/W
WARNING!
ESD SENSITIVE DEVICE
REV. PrC.