EVAL-ADE7878EBZ Analog Devices Inc, EVAL-ADE7878EBZ Datasheet - Page 4

• Manufacturer Part Number: EVAL-ADE7878EBZ
• Description: Energy Meter Eval. Board
• Manufacturer: Analog Devices Inc

Specifications of EVAL-ADE7878EBZ

• Silicon Manufacturer: Analog Devices
• Application Sub Type: Energy Meter
• Kit Application Type: Data Converter
• Silicon Core Number: ADE7878
• Features: External Transducers, LED Indicators, Logic Outputs
• Kit Contents: Board
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: Q4472972; Q4684026; Q5015773

EVAL-ADE7878EB
Votage Sense Inputs (P5, P6, P7, and P8 Connectors)
The voltage inputs connections on the ADE7878 evaluation
board can be directly connected to the line voltage sources. The
line voltages are attenuated using a simple resistor divider
network before it is presented to ADE7878. The attenuation
network on the voltage channels is designed such that the
corner frequency (3dB frequency) of the network matches that
of the antialiasing filters in the current channels inputs. This
prevents obtaining large energy errors at low power factors.
Figure 4 shows a typical connection of the phase A voltage
inputs: the resistor divider is enabled by opening JP7A jumper.
The antialiasing filter on VN data path is enabled by opening
JP7N jumper. JP8B and JP8N are opened. The analog input VN
is connected to AGND via the antialiasing filter R25/C25 using
JP8N connector.
The attenuation networks can be easily modified by the user to
accommodate any input level. However, the value of R32 (1KΩ),
should be modified only together with the corresponding
Table 1. Recommended Settings for Evaluation Board Connectors
Jumper
JP1
JP1A, JP1B,
JP1C, JP1N,
JP2
JP2A, JP2B,
JP2C, JP2N
JP3
JP3A, JP3B,
JP3C, JP3N
JP4
JP4A, JP4B,
JP4C, JP4N
JP5
JP5A, JP5B,
JP5C, JP5N
JP6
JP6A, JP6B,
JP6C, JP6N
JP7
JP7A, JP7B,
JP7C
JP7N
JP8
JP8A, JP8B,
JP8C
JP8N
JP9
JP9A, JP9B,
JP9C
Option
unsoldered
open
closed
open
soldered
closed
soldered
closed
soldered
open
soldered
closed
closed
open
open
open
open
open
open
soldered to pin
1 (AGND)
Description
It connects AGND to Earth. By default, it is unsoldered.
They connect IAP, IBP, ICP and INP to AGND. By default, they are open.
It connects ADE7878 VDD power supply (VDD_F at P9 connector) to the power supply of the isocouplers
(VDD2 at P10 connector). By default it is closed.
They connect IAN, IBN, ICN and INN to AGND. By default, they are open.
It connects padd metal below ADE7878 to AGND. By default, it is soldered.
They disable the phase compensation network in IAP, IBP, ICP and INP dat path. By default, they are
closed.
It connects C3 to DVDD. By default, it is soldered.
They disable the phase compensation network in IAN, IBN, ICN and INN data path. By default, they are
closed.
It connects C5 to AVDD. By default, it is soldered.
They disable the phase antialiasing filter in IAP, IBP, ICP and INP data path. By default, they are open.
It connects C41 to REF pin of ADE7878. By default, it is soldered.
It disables the phase antialiasing filter in IAN, IBN, ICN and INN data path. By default, they are closed.
It enables the supply to the microcontroller. When open, takes out the supply to the microcontroller. By
default, it is closed.
It disables the resistor divider in VAP, VBP and VCP data path. By default, they are open.
It disables the antialiasing filter in VN data path. By default, it is closed.
It sets the microcontroller in flash memory programming mode. By default, it is open.
They connect VAP, VBP and VCP to AGND. By default, they are open.
It connects VN to AGND. By default, it is open.
When closed, signals the microcontroller to declare all I/O pins as outputs. It is used when another
microcontroller is used to manage ADE7878 through P38 socket. By default, it is open.
They connect the ground of antialiasing filters in VAP, VBP and VCP data path to AGND or VN. By default,
they are soldered to AGND.
Rev. PrB | Page 4 of 30
resistors in the current channel (R17 and R18 on phase A
current data path).
The maximum signal level permissible at VAP, VBP and VCP
pins of ADE7878 is 0.5V peak. Although ADE7878 analog
inputs can withstand ±2V without risk of permanent damage,
the signal range should not exceed ±0.5V with respect to
AGND for specified operation.
Figure 4. Phase A Voltage Input Structure On Evaluation Board
VAP
VN
P8
P5
Preliminary Technical Data
R26
1M
JP7A
JP7N
R25
1K
JP9A
100K
R29
TP12
VN
TP9
VAP
VN
ADE78xx