Data Sheet
FEATURES
Two (ADE7912) or three (ADE7913) isolated, Σ-Δ analog-to-
digital converters (simultaneously sampling ADCs)
Integrated
isoPower,
isolated dc-to-dc converter
On-chip temperature sensor
4-wire SPI serial interface
Up to 4
ADE7912/ADE7913
devices clocked from a single
crystal or an external clock
Synchronization of multiple
ADE7912/ADE7913
devices
±31.25 mV peak input range for current channel
±500 mV peak input range for voltage channels
Reference drift: 10 ppm/°C typical
Single 3.3 V supply
20-lead, wide-body SOIC package with 8.3 mm creepage
Operating temperature: −40°C to +85°C
Safety and regulatory approvals
UL recognition
5000 V rms for 1 minute per UL 1577
CSA Component Acceptance Notice 5A
IEC 61010-1: 300 V rms
VDE certificate of conformity
DIN VDE V 0884-10 (VDE V 0884-10):2006-12
V
IORM
= 846 V peak
NEUTRAL
3-Channel, Isolated,
Sigma-Delta ADC with SPI
ADE7912/ADE7913
TYPICAL APPLICATIONS CIRCUIT
PHASE PHASE PHASE
B
A
C
ISOLATION
BARRIER
V1P
VM
IM
PHASE A
3.3V
ADE7912/
ADE7913
IP
V2P
GND
ISO_A
V1P
VM
IM
PHASE B
IP
GND
MCU
3.3V
3.3V
SYSTEM
MICROCONTROLLER
ADE7912/
ADE7913
SPI INTERFACE
V2P
GND
ISO_B
V1P
VM
IM
PHASE C
IP
GND
MCU
3.3V
ADE7912/
ADE7913
GND
MCU
V2P
GND
ISO_C
V1P
VM
NEUTRAL
LINE
IM
IP
LOAD
V2P
11115-001
GND
MCU
3.3V
APPLICATIONS
Shunt-based polyphase meters
Power quality monitoring
Solar inverters
Process monitoring
Protective devices
Isolated sensor interfaces
Industrial PLCs
ADE7912/
ADE7913
(OPTIONAL)
GND
ISO_N
EARTH
GND
MCU
Figure 1.
GENERAL DESCRIPTION
The
ADE7912/ADE7913
1
are isolated, 3-channel Σ-Δ ADCs for
polyphase energy metering applications using shunt current
sensors. Data and power isolation are based on the Analog Devices,
Inc.,
iCoupler®
technology. The
ADE7912
features two ADCs,
and the
ADE7913
features three ADCs. The current ADC provides
a 67 dB signal-to-noise ratio (SNR) over a 3 kHz signal bandwidth,
whereas the voltage ADCs provide an SNR of 72 dB over the same
bandwidth. One channel is dedicated to measuring the voltage
across a shunt when the shunt is used for current sensing. Up to
two additional channels are dedicated to measuring voltages,
which are usually sensed using resistor dividers. One voltage
channel can measure the temperature of the die via an internal
sensor. The
ADE7913
includes three channels: one current and
two voltage channels. The
ADE7912
has one voltage channel but
is otherwise identical to the
ADE7913.
1
Protected by U.S. Patents 5,952,849; 6,873,065; 7,075,329; 6,262,600; 7,489,526; 7,558,080; 8,892,933. Other patents are pending.
Document Feedback
Rev. C
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www.analog.com
ADE7912/ADE7913
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications ....................................................................................... 1
Typical Applications Circuit............................................................ 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
Functional Block Diagrams ............................................................. 4
Specifications..................................................................................... 5
Regulatory Approvals................................................................... 7
Insulation and Safety Related Specifications ............................ 7
DIN V VDE V 0884-10 (VDE V 0884-10):2006-12 Insulation
Characteristics .............................................................................. 8
Timing Characteristics ................................................................ 9
Absolute Maximum Ratings.......................................................... 10
Thermal Resistance .................................................................... 10
ESD Caution ................................................................................ 10
Pin Configuration and Function Descriptions ........................... 11
Typical Performance Characteristics ........................................... 13
Test Circuit ...................................................................................... 15
Terminology .................................................................................... 16
Theory of Operation ...................................................................... 18
Analog Inputs .............................................................................. 18
Analog-to-Digital Conversion .................................................. 18
Reference Circuit ........................................................................ 20
CRC of ADC Output Values ..................................................... 20
Data Sheet
Temperature Sensor ................................................................... 21
Protecting the Integrity of Configuration Registers .............. 21
CRC of Configuration Registers............................................... 21
ADE7912/ADE7913 Status ....................................................... 22
Insulation Lifetime ..................................................................... 22
Applications Information .............................................................. 23
ADE7912/ADE7913 in Polyphase Energy Meters ................. 23
ADE7912/ADE7913 Clock ....................................................... 25
SPI-Compatible Interface .......................................................... 26
Synchronizing Multiple ADE7912/ADE7913 Devices .......... 28
Power Management ........................................................................ 31
DC-to-DC Converter................................................................. 31
Magnetic Field Immunity.......................................................... 32
Power-Up and Initialization Procedures ................................. 33
Hardware Reset ........................................................................... 36
Software Reset ............................................................................. 36
Power-Down Mode .................................................................... 36
Layout Guidelines ........................................................................... 37
ADE7913 Evaluation Board ...................................................... 37
ADE7912/ADE7913 Version .................................................... 37
Register List ..................................................................................... 38
Outline Dimensions ....................................................................... 41
Ordering Guide .......................................................................... 41
REVISION HISTORY
2/2018—Rev. B to Rev. C
Changes to Table 2 ............................................................................ 7
8/2016—Rev. A to Rev. B
Added Patent Note, Note 1 .............................................................. 1
Change to Table 9 ........................................................................... 11
Change to Figure 12 ....................................................................... 13
Changes to DC-to-DC Converter Section .................................. 31
4/2015—Rev. 0 to Rev. A
Changes to Features Section and General Description Section........ 1
Changes Table 1 ................................................................................ 5
Changed Regulatory Approvals (Pending) Section to Regulatory
Approvals Section ............................................................................. 7
Changes to Regulatory Approvals Section, Table 2, and Tracking
Resistance (Comparative Tracking Index) Parameter, Table 3.......... 7
Changed DIN V VDE V 0884-10 (VDE V 0884-10) Insulation
Characteristics Section to DIN V VDE V 0884-10 (VDE V
0884-10):2006-12 Insulation Characteristics Section .................. 8
Changes to Table 4 and Figure 4 ..................................................... 8
Changes to Table 8.......................................................................... 10
Changes to Pin 15 Description, Table 9....................................... 11
Changes to Figure 9 and Figure 11............................................... 13
Changes to Terminology Section ................................................. 16
Changes to ADC Transfer Function Section and CRC of ADC
Output Values Section ................................................................... 20
Changes to Temperature Sensor Section ..................................... 21
Changes to Insulation Lifetime Section ...................................... 22
Deleted Figure 31; Renumbered Sequentially ............................ 22
Changes to SPI-Compatible Interface Section ........................... 26
Changes to SPI Read Operation in Burst Mode Section ........... 27
Changes to Power-Down Mode Section ..................................... 36
Changes to Layout Guidelines Section ........................................ 37
Deleted Figure 54............................................................................ 37
Deleted Figure 55 and Figure 56 .................................................. 38
Deleted Figure 57 and Figure 58 .................................................. 39
Deleted Figure 59 and Figure 60 .................................................. 40
11/2013—Revision 0: Initial Version
Rev. C | Page 2 of 41
Data Sheet
The
ADE7912/ADE7913
include
isoPower®,
an integrated,
isolated dc-to-dc converter. Based on the Analog Devices
iCoupler
technology, the dc-to-dc converter provides the
regulated power required by the first stage of the ADCs at a
3.3 V input supply.
isoPower
eliminates the need for an external
dc-to-dc isolation block. The
iCoupler
chip scale transformer
technology also isolates the logic signals between the first and
second stages of the ADC. The result is a small form factor, total
isolation solution.
The
ADE7912/ADE7913
configuration and status registers are
accessed via a bidirectional SPI serial port for easy interfacing
with microcontrollers.
ADE7912/ADE7913
The
ADE7912/ADE7913
can be clocked from a crystal or an
external clock signal. To minimize the system bill of materials,
the master
ADE7912/ADE7913
can drive the clocks of up to
three additional
ADE7912/ADE7913
devices.
Multiple
ADE7912/ADE7913
devices can be synchronized to
sample at the same moment and provide coherent outputs.
The
ADE7912/ADE7913
are available in a 20-lead, Pb-free,
wide-body SOIC package with 8.3 mm creepage.
Rev. C | Page 3 of 41
ADE7912/ADE7913
FUNCTIONAL BLOCK DIAGRAMS
ISOLATION
BARRIER
1
2
8
POWER
ISOLATION
LDO
TEMP
SENSOR
18
ADC
5
4
6
7
9
10
ADC
VREF
CLOCK
ADC
DATA
DATA
ISOLATION
CLOCK
DATA
DIGITAL
BLOCK
AND
SPI PORT
17
16
15
14
13
CS
SCLK
MOSI
MISO
XTAL2
XTAL1
11115-003
Data Sheet
ADE7912
VDD
ISO
GND
ISO
LDO
19
20
VDD
GND
V2P
VM
V1P
IM
IP
REF
GND
ISO
3
12 CLKOUT/
DREADY
11
GND
Figure 2.
ADE7912
Functional Block Diagram
ISOLATION
BARRIER
1
2
8
POWER
ISOLATION
LDO
TEMP
SENSOR
18
ADC
DATA
ADC
ADC
VREF
CLOCK
DATA
ISOLATION
CLOCK
DATA
DIGITAL
BLOCK
AND
SPI PORT
17
16
15
14
13
CS
SCLK
MOSI
MISO
XTAL2
XTAL1
11115-002
ADE7913
VDD
ISO
GND
ISO
LDO
19
20
VDD
GND
V2P
VM
V1P
IM
IP
REF
GND
ISO
3
5
4
6
7
9
10
12 CLKOUT/
DREADY
11
GND
Figure 3.
ADE7913
Functional Block Diagram
Rev. C | Page 4 of 41
Data Sheet
SPECIFICATIONS
ADE7912/ADE7913
VDD = 3.3 V ± 10%, GND = 0 V, on-chip reference, XTAL1 = 4.096 MHz, T
MIN
to T
MAX
= −40°C to +85°C, T
A
= 25°C (typical).
Table 1.
Parameter
ANALOG INPUTS
1
Pseudo Differential Signal Voltage Range
Between IP and IM Pins
Pseudo Differential Signal Voltage Range
Between V1P and VM Pins and Between
V2P and VM Pins
Maximum VM and IM Voltage
Crosstalk
Min
−31.25
−500
−25
−90
−105
Typ
Max
+31.25
+500
+25
Unit
mV peak
mV peak
mV
dB
dB
Test Conditions/Comments
IM pin connected to GND
ISO
Pseudo differential inputs between V1P and VM
pins and between V2P and VM pins; VM pin
connected to GND
ISO
IP and IM inputs set to 0 V (GND
ISO
) when V1P and
V2P inputs at full scale
V2P and VM inputs set to 0 V (GND
ISO
) when IP
and V1P inputs at full scale; V1P and VM inputs
set to 0 V (GND
ISO
) when IP and V2P inputs at full
scale
Input Impedance to GND
ISO
(DC)
IP, IM, V1P, and V2P Pins
VM Pin
Current Channel ADC Offset Error
Voltage Channels ADC Offset Error
ADC Offset Drift over Temperature
Gain Error
Gain Drift over Temperature
AC Power Supply Rejection (PSR)
DC Power Supply Rejection (PSR)
TEMPERATURE SENSOR
Accuracy
WAVEFORM SAMPLING—CURRENT CHANNEL
1
Signal-to-Noise Ratio (SNR)
480
240
−2
−35
±200
−4
−135
−85
−90
−80
+4
+135
+85
kΩ
kΩ
mV
mV
ppm/°C
%
ppm/°C
ppm/°C
dB
dB
V2 channel applies to the
ADE7913
only
V1 channel only
Current channel
V1 and V2 channels
VDD = 3.3 V + 120 mV rms (50 Hz/100 Hz),
IP = V1P = V2P = GND
ISO
VDD = 3.3 V ± 330 mV dc, IP = 6.25 mV rms, V1P =
V2P = 100 mV rms
±5
67
68
72
74
66
68
72
73
−79
−78
−82
−82
83
83
85
85
72
74
77
79
°C
dBFS
dBFS
dBFS
dBFS
dBFS
dBFS
dBFS
dBFS
dBFS
dBFS
dBFS
dBFS
dBFS
dBFS
dBFS
dBFS
dBFS
dBFS
dBFS
dBFS
ADC_FREQ = 8 kHz, BW = 3300 Hz
ADC_FREQ = 8 kHz, BW = 2000 Hz
ADC_FREQ = 2 kHz, BW = 825 Hz
ADC_FREQ = 2 kHz, BW = 500 Hz
ADC_FREQ = 8 kHz, BW = 3300 Hz
ADC_FREQ = 8 kHz, BW = 2000 Hz
ADC_FREQ = 2 kHz, BW = 825 Hz
ADC_FREQ = 2 kHz, BW = 500 Hz
ADC_FREQ = 8 kHz, BW = 3300 Hz
ADC_FREQ = 8 kHz, BW = 2000 Hz
ADC_FREQ = 2 kHz, BW = 825 Hz
ADC_FREQ = 2 kHz, BW = 500 Hz
ADC_FREQ = 8 kHz, BW = 3300 Hz
ADC_FREQ = 8 kHz, BW = 2000 Hz
ADC_FREQ = 2 kHz, BW = 825 Hz
ADC_FREQ = 2 kHz, BW = 500 Hz
ADC_FREQ = 8 kHz, BW = 3300 Hz
ADC_FREQ = 8 kHz, BW = 2000 Hz
ADC_FREQ = 2 kHz, BW = 825 Hz
ADC_FREQ = 2 kHz, BW = 500 Hz
Signal-to-Noise-and-Distortion Ratio (SINAD)
Total Harmonic Distortion (THD)
Spurious-Free Dynamic Range (SFDR)
VOLTAGE CHANNELS
1
Signal-to-Noise Ratio (SNR)
Rev. C | Page 5 of 41
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