Energy Metering IC with Integrated
Oscillator and No-Load Indication
ADE7769
The ADE7769 specifications surpass the accuracy require-
ments of the IEC62053-21 standard. The AN-679 Application
Note can be used as a basis for a description of an IEC61036
(equivalent to IEC62053-21) low cost, watt-hour meter
reference design.
FEATURES
On-chip oscillator as clock source
High accuracy, supports 50 Hz/60 Hz IEC62053-21
Less than 0.1% error over a dynamic range of 500 to 1
Supplies average real power on frequency outputs F1 and F2
High frequency output CF calibrates and supplies
instantaneous real power
CF output remains logic high when ADE7769 is under
no-load threshold
Logic output REVP indicates a potential miswiring or
negative power
The only analog circuitry used in the ADE7769 is in the Σ-Δ
ADCs and reference circuit. All other signal processing, such as
multiplication and filtering, is carried out in the digital domain.
This approach provides superior stability and accuracy over
time and extreme environmental conditions.
Direct drive for electromechanical counters and 2-phase
stepper motors (F1 and F2)
Proprietary ADCs and DSPs provide high accuracy over
large variations in environmental conditions and time
On-chip power supply monitoring
On-chip creep protection (no-load threshold)
The ADE7769 supplies average real power information on the
low frequency outputs, F1 and F2. These outputs can be used to
directly drive an electromechanical counter or interface with an
MCU. The high frequency CF logic output, ideal for calibration
purposes, provides instantaneous real power information.
On-chip reference 2.45 V (20 ppm/°C typical) with external
overdrive capability
Single 5 V supply, low power (20 mW typical)
Low cost CMOS process
The ADE7769 includes a power supply monitoring circuit on
the VDD supply pin. The ADE7769 remains inactive until the
supply voltage on VDD reaches approximately 4 V. If the supply
falls below 4 V, the ADE7769 also remains inactive and the F1,
F2, and CF outputs are in their nonactive modes.
GENERAL DESCRIPTION
The ADE77691 is a high accuracy electrical energy metering IC.
It is a pin reduction version of the ADE7755 with an enhanced,
precise oscillator circuit that serves as a clock source to the chip.
The ADE7769 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 the shunt resistor.
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 ADE7769 does not exhibit creep
when no load is present. During a no-load condition, the CF
pin stays logic high.
1U.S. Patents 5,745,323; 5,760,617; 5,862,069; 5,872,469; others pending.
The ADE7769 has a 16-lead, narrow body SOIC package.
FUNCTIONAL BLOCK DIAGRAM
V
AGND
DGND
DD
1
6
13
ADE7769
POWER
SUPPLY MONITOR
SIGNAL
PROCESSING
BLOCK
V2P
V2N
2
3
...110101...
+
+
Σ-Δ
ADC
MULTIPLIER
PHASE
LPF
CORRECTION
...11011001...
4
5
V1N
V1P
Σ-Δ
ADC
Φ
HPF
DIGITAL-TO-FREQUENCY
CONVERTER
INTERNAL
OSCILLATOR
4kΩ
2.5V
REFERENCE
7
11
8
10
9
12
14
16
15
REF
RCLKIN
REVP CF
F1
SCF S0
S1
F2
IN/OUT
Figure 1.
Rev. A
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 that may result from its use.
Specifications subject to change without notice. No license is granted by implication
or otherwise under any patent or patent rights of Analog Devices. Trademarks and
registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
www.analog.com
© 2005 Analog Devices, Inc. All rights reserved.
5秒后页面跳转
常用8脚开关电源芯片型号大全
74HC04芯片引脚图及功能、应用电路图讲解
CR6842芯片参数、引脚配置、应用电路图详解
国产PoE供电芯片选型替代指南，你想要的都在这里！
微信公众号
抖音公众号
浙公网安备 33010502006866号 浙ICP备10014259号-119
营业执照ICP证
数据手册
如果您发现信息不准确，
