L-Card ADC Series, User Manual, Page: 31 / 69

Fig. 4-2: The location of the "common wires" circuits on the E-502 board
In particular, GND is a common wire for internal interfaces UART, JTAG Blackfin, JTAG
ARM.
If you use a separate E-502 board without a chassis
3
in the embedded chassis circuit applications
(CHASSIS), it is recommended to connect it to the solid metal surface of the chassis (case
construction). Two right ports of
3.05 mm on fig. 4-2 have a metal coating connected to a CHASSIS
circuit, and two left ports of 3.05 mm are isolated from the other circuits. These 4 mounting ports
are used to secure the E-502 board.
4.4. E-502 connectors description
4.4.1. Connector Analog .
Connector Analog is a 37-pin 2-row type DRB-37M plug on the front panel of the E-502. The
conductive connector contact piece (shield) is electrically connected to the GND signal ground
circuit. On the shield of the cable part of the connector, the shield of the signal cable can be directly
sealed. The connector
Analog shield does not have a contact with AGND, DGND and other circuits
of the Analog connector.
3
Here we do not consider the usage accuracy of the certified Measuring Device without a standard chassis.
1
JTAG Blackfin
( GND )
JTAG ARM
( GND )
1
1
UART
( GND )
ADSP-
BF523
FPGA
Cyclone
IV
SDRAM
SDRAM
ARM
LPC4337
CPLD
USB
( GND_USB )
D I G I T A L
Элементы
ЦАП
A N A L O G
Гальванический
барьер
Отв
. 3,05
мм
GHASSIS
Корпус
разъёма
( CHASSIS )
Корпус
разъёма
( CHASSIS )
Цифровые
сигналы
( DGND )
DI_SYN1
( DGND )
A
налоговые
сигналы
( AGND )
Изололированные
входы
Ethernet
GHASSIS
Отв
. 3,05
мм
GHASSIS
0 V
DAC
elements
Digital signals
Port Ø3,05 mm
Port Ø3,05 mm
Connector
chassis
Isolated Ethernet
inputs
Galvanic barrier
Connector
chassis
Analog
signals