Microchip MD0100DB1 Handleiding

Microchip Niet gecategoriseerd MD0100DB1

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Supertex inc.
Supertex inc.
www.supertex.com
MD0100DB1
Doc.# DSDB-MD0100DB1
A032913
General Description
The Supertex MD0100DB1 demo board contains four
MD0100DK6-G dual packages providing 8 T/R switches in
the system. There are no other external components on the
board.
This demo board replaces 8 discrete diode bridge protection
circuits. The input of the MD0100DB1 is called TX which is
connected to the output of the transmitter, and the output is
called RX which is connected to the input of the receiver. The
TX and RX are interchangeable.
The MD0100DB is especially laid out so that all the inputs
are on one side and all the outputs are on other side of the
board. It provides for easy replacement on the system for
testing.
This demo board can be put into the system directly by
removing the diode bridge connections between the
transmitter and receiver (please see Figure 1), and it can
then be connected up to 8 pairs of transmitters/receivers as
shown in the connection diagram in Figure 2.
High Voltage Protection
8-Channel T/R
Switch Demoboard
Board Layout
Actual Size: 25.0mm x 9.7mm
Parameter Value
VA-B, differential voltage drop 0V to ±100V
IPEAK ±60mA
TON ≤20ns
TOFF ≤20ns
Specications
RX1 RX2 RX3 RX4 RX5 RX6 RX7 RX8
Pin 9
Pin 8
Pin 16
Pin 1
TX
1 T X2 TX3 TX4 TX5 T X6 TX7 TX8
2
Supertex inc.
www.supertex.com
MD0100DB1
Doc.# DSDB-MD0100DB1
A032913
Figure 2: MD0100DB1 Connection Diagram
U1
MD0100
RX1
RX4
RX3
RX2
RX5
RX6
RX7
RX8
TX1
TX4
TX3
TX2
TX5
TX6
TX7
TX8
TX1
TX2
TX3
TX4
TX5
TX6
TX7
TX8
U4
MD0100
U3
MD0100
U2
MD0100
RX1
RX2
RX3
RX4
RX5
RX6
RX7
RX8
Transmitters Receivers
Figure 1: Conventional discrete T/R switch with Diode Bridge
Transmitter Receiver
TX RX
+5.0V
-5.0V
Conventional Diode Bridge
Protection Circuit
Back-to-back
diodes
Supertex inc. does not recommend the use of its products in life support applications, and will not knowingly sell them for use in such applications unless it receives
an adequate “product liability indemnification insurance agreement.” does not assume responsibility for use of devices described, and limits its liabilit Supertex inc. y
to the replacement of the devices determined defective due to workmanship. No responsibility is assumed for possible omissions and inaccuracies. Circuitry and
specifications are subject to change without notice. For the latest product specifications refer to the (website: http//wwwSupertex inc. .supertex.com)
©2013 Supertex inc. All rights reserved. Unauthorized use or reproduction is prohibited. Supertex inc.
1235 Bordeaux Drive, Sunnyvale, CA 94089
Tel: 408-222-8888
www.supertex.com
3
MD0100DB1
Doc.# DSDB-MD0100DB1
A032913
Pin # Pin Name Function
1 TX1 Input of the switch #1, connects to the output of the transmitter.
2 TX2 Input of the switch #2, connects to the output of the transmitter.
3 TX3 Input of the switch #3, connects to the output of the transmitter.
4 TX4 Input of the switch #4, connects to the output of the transmitter.
5 TX5 Input of the switch #5, connects to the output of the transmitter.
6 TX6 Input of the switch #6, connects to the output of the transmitter.
7 TX7 Input of the switch #7, connects to the output of the transmitter.
8 TX8 Input of the switch #8, connects to the output of the transmitter.
9 RX8 Output of the switch #8, connects to the input of the receiver.
10 RX7 Output of the switch #7, connects to the input of the receiver.
11 RX6 Output of the switch #6, connects to the input of the receiver.
12 RX5 Output of the switch #5, connects to the input of the receiver.
13 RX4 Output of the switch #4, connects to the input of the receiver.
14 RX3 Output of the switch #3, connects to the input of the receiver.
15 RX2 Output of the switch #2, connects to the input of the receiver.
16 RX1 Output of the switch #1, connects to the input of the receiver.
Part Description Value Package Manufacturer Part Number
U1 - U4 T/R switch ±100V 4x4 8-Lead DFN Supertex MD0100DK6-G
Pin Description
Bill Of Materials
The MD0100 can be considered a normally closed switch
controlled by a switch control. The switch control monitors
the voltage drop across terminals TX and RX. If the voltage
difference is greater than ±2.0V, the T/R switch will start to
open. Once in the open state, there is a small amount of
current owing through the T/R switch, 200µA, to detect if
the high voltage is still present or not. The T/R switch will not
close until the voltage across terminal TX and RX drops back
within ±2.0V.
It is important to make sure that the back-to-back diodes
are connected from the output of this demoboard to ground
(please refer to Figure 1). This is to allow the initial peak
current to ow through the switch so it can drop ±2.0V and
operate correctly. If the diodes are absent, there will be no
path current and if the voltage drop across the two terminals
is less than ±2.0V, then the switch will remain in the closed
position.
Operation

Product specificaties

Merk: Microchip
Categorie: Niet gecategoriseerd
Model: MD0100DB1

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