ADE7757 Datasheet PDF - Analog Devices
| Part Number | ADE7757 | |
| Description | Energy Metering IC with Integrated Oscillator | |
| Manufacturers | Analog Devices | |
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PRELIMINARY TECHNICAL DATA
a
Energy Metering IC
with Integrated Oscillator
Preliminary Technical Data
ADE7757*
FEATURES
On Chip Oscillator as clock source
High Accuracy, Supports 50 Hz/60 Hz IEC 521/1036
Less than 0.1% Error Over a Dynamic Range of
500 to 1
The ADE7757 Supplies Average Real Power on the
Frequency Outputs F1 and F2
The High Frequency Output CF Is Intended for
Calibration and Supplies Instantaneous Real Power
Direct Drive for Electromechanical Counters and
Two Phase Stepper Motors (F1 and F2)
Proprietary ADCs and DSP Provide High Accuracy over
Large Variations in Environmental Conditions and
Time
On-Chip Power Supply Monitoring
On-Chip Creep Protection (No Load Threshold)
On-Chip Reference 2.5 V ؎ 8% (30 ppm/؇C Typical)
with External Overdrive Capability
Single 5 V Supply, Low Power (15 mW Typical)
Low Cost CMOS Process
AC Input only
GENERAL DESCRIPTION
The ADE7757 is a high accuracy electrical energy mea-
surement IC. It is a pin reduction version of AD7755
with an enhancement of a precise oscillator circuit that
serves as a clock source to the chip. The ADE7757
eliminates the cost of an external crystal or resonator,
thus reducing the overall cost of a meter built with this
IC. The chip directly interfaces with shunt resistor and
only operates with AC input.
The ADE7757 specifications surpass the accuracy require-
ments as quoted in the IEC1036 standard. Due to the
similarity between the ADE7757 and AD7755, the Appli-
cation Note AN-559 can be used as a basis for a descrip-
tion of an IEC1036 low cost watt-hour meter reference
design.
The only analog circuitry used in the ADE7757 is in the
sigma-delta ADCs and reference circuit. All other signal
processing (e.g., multiplication and filtering) is carried
out in the digital domain. This approach provides superior
stability and accuracy over time and extreme environmen-
tal conditions.
The ADE7757 supplies average real power information on
the low frequency outputs F1 and F2. These outputs may
be used to directly drive an electromechanical counter or
interface with an MCU. The high frequency CF logic
output, ideal for calibration purposes, provides instanta-
neous real power information.
The ADE7757 includes a power supply monitoring circuit
on the VDD supply pin. The ADE7757 will remain in reset
mode until the supply voltage on VDD reaches approxi-
mately 4 V. If the supply falls below 4 V, the ADE7757
will also reset and the F1, F2 and CF outputs will be in
their non-active modes.
Internal phase matching circuitry ensures that the voltage
and current channels are phase matched while the HPF in
the current channel eliminates dc offsets. An internal no-
load threshold ensures that the ADE7757 does not exhibit
creep when no load is present.
The ADE7757 is available in 16-lead SOIC narrow-body
package.
FUNCTIONAL BLOCK DIAGRAM
VDD AGND
DGND
V2P
V2N
V1N
V1P
POWER
SUPPLY MONITOR
ADE7757
∑ ∆ ...110101...
ADC
MULTIPLIER
SIGNAL
PROCESSING
BLOCK
LPF
∑∆
ADC
PHASE
CORRECTION HPF
. . .11011001. . .
Φ
2.5V 4kV
REFERENCE
INTERNAL
OSCILLATOR
DIGITAL-TO-FREQUENCY
CONVERTER
REFIN/OUT RCLKIN RESERVED SCF S0 S1
*U.S. Patents 5,745,323, 5,760,617, 5,862,069, 5,872,469; other pending.
CF F1 F2
REV. PrC.
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, USA.
Tel: 781/329-4700 World Wide Web Site: http://www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., February 2002
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PRELIMINARY TECHNICAL DATA
ADE7757
Pin No.
1
2,3
4, 5
6
7
8
9,10
11
12
13
14
15,16
Mnemonic
VDD
V2P, V2N
V1N, V1P
AGND
REFIN/OUT
SCF
S1, S0
RCLKIN
RESERVED
DGND
CF
F2,F1
PIN FUNCTION DESCRIPTIONS
Description
Power Supply. This pin provides the supply voltage for the circuitry in the ADE7757. 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 ceramic 100 nF 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. The
maximum signal level at these pins is ±165 mV with respect to AGND. Both inputs have
internal ESD protection circuitry and an overvoltage of ±6 V can also 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 pin V1N for specified opera-
tion. The maximum signal level at this pin is ±165 mV with respect to AGND. Both inputs
have internal ESD protection circuitry and in addition an overvoltage of ±6 V can be sus-
tained on these inputs without risk of permanent damage.
This provides the ground reference for the analog circuitry in the ADE7757, i.e., 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, e.g., antialiasing filters, current and
voltage sensors, etc. For accurate noise suppression, the analog ground plane should only be
connected to the digital ground plane at one point. A star ground configuration will help 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 nomi-
nal value of 2.5 V ± 8% and a typical temperature coefficient of 30 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 100 nF ceramic capacitor.
Select Calibration Frequency. This logic input is used to select the frequency on the calibra-
tion output CF. Table III shows calibration frequencies selection.
These logic inputs are used to select one of four possible frequencies for the digital-to-fre-
quency conversion. With this logic input, designers have greater flexibility when designing an
energy meter. See Selecting a Frequency for an Energy Meter Application.
To enable the internal oscillator as a clock source to the chip, a precise 5 kΩ resistor must be
connected from this pin to DGND.
Reserved pin. No load should be connected to this pin.
This provides the ground reference for the digital circuitry in the ADE7757, i.e., 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, e.g.,
counters (mechanical and digital), MCUs and indicator LEDs. For accurate noise suppres-
sion the analog ground plane should only be connected to the digital ground plane at one
point only, e.g., a star ground.
Calibration Frequency Logic Output. The CF logic output provides instantaneous real power
information. This output is intended for calibration purposes. Also see SCF pin description.
Low Frequency Logic Outputs. F1 and F2 supply average real power information. The logic
outputs can be used to directly drive electromechanical counters and two phase stepper mo-
tors. See Transfer Function.
REV. PrC.
PIN CONFIGURATION
SOIC-16nb Package
VDD 1
16 F1
V2P 2
15 F2
V2N 3
14 CF
V1N 4 ADE7757 13 DGND
V1P
5
TOP VIEW
(Not to Scale)
12 RESERVED
AGND 6
11 RCLKIN
REFIN/OUT 7
10 S0
SCF 8
9 S1
–5–
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| Information | Total 14 Pages | |
| Link URL | [ Copy URL to Clipboard ] | |
| Download | [ ADE7757.PDF Datasheet ] | |
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