AD71056ARZ-RL Analog Devices Inc, AD71056ARZ-RL Datasheet

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AD71056ARZ-RL

Manufacturer Part Number
AD71056ARZ-RL
Description
IC,Power Metering,CMOS,SOP,16PIN,PLASTIC
Manufacturer
Analog Devices Inc
Datasheet

Specifications of AD71056ARZ-RL

Input Impedance
320 KOhm
Measurement Error
0.1%
Voltage - I/o High
2.4V
Voltage - I/o Low
0.8V
Current - Supply
5mA
Voltage - Supply
4.75 V ~ 5.25 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
16-SOIC (0.154", 3.90mm Width)
Meter Type
Single Phase
Lead Free Status / RoHS Status
Lead free / RoHS Compliant

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Part Number
Manufacturer
Quantity
Price
Part Number:
AD71056ARZ-RL
Manufacturer:
Analog Devices Inc.
Quantity:
397
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, F2)
High frequency output (CF) calibrates and supplies
Logic output (REVP) indicates potential miswiring or
Direct drive for electromechanical counters and 2-phase
Proprietary ADCs and DSP provide high accuracy over large
On-chip power supply monitoring
On-chip creep protection (no load threshold)
On-chip reference 2.45 V (20 ppm/°C typical) with external
Single 5 V supply, low power (20 mW typical)
Low cost CMOS process
GENERAL DESCRIPTION
The AD71056
with a precise oscillator circuit that serves as a clock source to
the chip. The AD71056 eliminates the need for an external
crystal or resonator, thus reducing the overall cost of building a
meter with this IC. The chip directly interfaces with the shunt
resistor.
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.
U.S. Patents 5,745,323; 5,760,617; 5,862,069; 5,872,469; others pending.
instantaneous real power
negative power
stepper motors (F1, F2)
variations in environmental conditions and time
overdrive capability
1
is a high accuracy, electrical energy metering IC
V2N
V1N
V2P
V1P
2
4
3
5
REFERENCE
+
+
2.5V
SUPPLY MONITOR
Oscillator and Reverse Polarity Indication
4kΩ
REF
FUNCTIONAL BLOCK DIAGRAM
POWER
V
ADC
ADC
Σ-Δ
Σ-Δ
DD
IN/OUT
1
7
...110101...
...11011001...
AGND
OSCILLATOR
INTERNAL
RCLKIN
6
11
Energy Metering IC with Integrated
Figure 1.
CORRECTION
PHASE
Ф
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
The AD71056 specifications surpass the accuracy requirements
as quoted in the IEC62053-21 standard.
The only analog circuitry used in the AD71056 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 in extreme environmental conditions.
The AD71056 supplies average real power information on F1
and F2, the low frequency outputs. These outputs either 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.
The AD71056 includes a power supply monitoring circuit on
the V
supply voltage on V
falls below 4 V, the AD71056 also remains inactive and the F1,
F2, and CF outputs are in their nonactive modes.
Internal phase matching circuitry ensures that the voltage and
current channels are phase matched, and the HPF in the current
channel eliminates dc offsets. An internal no load threshold
ensures that the AD71056 does not exhibit creep when no load
is present.
The part is available in a 16-lead, narrow body SOIC package.
SCF
8
MULTIPLIER
S0
DIGITAL-TO-FREQUENCY
10
DD
HPF
AD71056
supply pin. The AD71056 remains inactive until the
S1
CONVERTER
9
REVP
12
CF
14
DD
DGND
PROCESSING
LPF
13
reaches approximately 4 V. If the supply
SIGNAL
BLOCK
F1
16
©2006 Analog Devices, Inc. All rights reserved.
F2
15
AD71056
www.analog.com

AD71056ARZ-RL Summary of contents

Page 1

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, F2) High frequency output (CF) calibrates and ...

Page 2

AD71056 TABLE OF CONTENTS Features .............................................................................................. 1 General Description ......................................................................... 1 Functional Block Diagram .............................................................. 1 Revision History ............................................................................... 2 Specifications..................................................................................... 3 Timing Characteristics ................................................................ 4 Absolute Maximum Ratings............................................................ 5 ESD Caution.................................................................................. 5 Terminology ...................................................................................... 6 Pin Configuration and Function ...

Page 3

SPECIFICATIONS ± 5%, AGND = DGND = 0 V, on-chip reference, RCLKIN = 6.2 kΩ, 0.5% ± 50 ppm/° otherwise noted. Table 1. Parameter , ACCURACY Measurement Error on Channel V1 ...

Page 4

AD71056 Parameter POWER SUPPLY See the Terminology section for an explanation of specifications. 2 See plots in the Typical Performance Characteristics section. 3 See the Analog Inputs section. 4 Sample tested during initial release and ...

Page 5

ABSOLUTE MAXIMUM RATINGS T = 25°C, unless otherwise noted. A Table 3. Parameter V to AGND DGND DD Analog Input Voltage to AGND V1P, V1N, V2P, and V2N Reference Input Voltage to AGND Digital Input Voltage to ...

Page 6

AD71056 TERMINOLOGY Measurement Error The error associated with the energy measurement made by the AD71056 is defined by the following formula: Energy Registered by AD71056 = % Error True Energy Phase Error Between Channels The high-pass filter (HPF) in the ...

Page 7

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS Table 4. Pin Function Descriptions Pin No. Mnemonic Description 1 V Power Supply. This pin provides the supply voltage for the circuitry in the AD71056. Maintain the supply DD voltage ± 5% ...

Page 8

AD71056 TYPICAL PERFORMANCE CHARACTERISTICS 220V 40A TO 40mA 350µΩ 1 0.8 ON-CHIP REFERENCE 0.6 0.4 0.2 +25°C 0 –0.2 –0.4 –0.6 –0.8 –1.0 0.1 1 CURRENT CHANNE Full Scale) Figure 5. Error as a ...

Page 9

PF = 0.5 IND 0.1 0 –0.1 –0 0.5 CAP –0.3 –0.4 –0 FREQUENCY (Hz) Figure 9. Error Reading over Input Frequency 1.0 ...

Page 10

AD71056 THEORY OF OPERATION The two ADCs in the AD71056 digitize the voltage signals from the current and voltage sensors. These ADCs are 16-bit, Σ-Δ with an oversampling rate of 450 kHz. This analog input struc- ture greatly simplifies sensor ...

Page 11

sin h t β ≠ where: i(t) is the instantaneous current the dc component ...

Page 12

AD71056 APPLICATIONS ANALOG INPUTS Channel V1 (Current Channel) The voltage output from the current sensor is connected to the AD71056 at Channel V1. Channel fully differential voltage input. V1P is the positive input with respect to V1N. ...

Page 13

POWER SUPPLY MONITOR The AD71056 contains an on-chip power supply monitor. The power supply ( continuously monitored by the AD71056 the supply is less than 4 V, the AD71056 becomes inactive. This is useful to ensure ...

Page 14

AD71056 Digital-to-Frequency Conversion As previously described, the digital output of the low-pass filter after multiplication contains the real power information. However, because this LPF is not an ideal brick wall filter implementation, the output signal also contains attenuated components at ...

Page 15

The energy consumed during an integration period is given by Counter = × = Energy Average Power Time Time For the purpose of calibration, this integration time can be as long as 10 seconds to 20 seconds to accumulate enough ...

Page 16

AD71056 Table 6. Maximum Output Frequency on the F1 and F2 Pins S1 S0 OSC Relation Max Frequency 0 0 0.204 × f 0.175 0.204 × 0.204 × ...

Page 17

The CF output frequencies are given in Table 7. As with F1 and F2, if the period the CF pulse width is set to half the period. If the CF frequency, for example, is ...

Page 18

... COPLANARITY 0.10 ORDERING GUIDE Model Temperature Range AD71056AR −40°C to +85°C AD71056AR-RL −40°C to +85°C 1 AD71056ARZ −40°C to +85°C 1 AD71056ARZ-RL −40°C to +85° Pb-free part. 10.00 (0.3937) 9.80 (0.3858 6.20 (0.2441) 1 5.80 (0.2283) 8 1.27 (0.0500) BSC 1 ...

Page 19

NOTES Rev Page AD71056 ...

Page 20

AD71056 NOTES ©2006 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D05636-0-8/06(A) Rev Page ...

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