MAS9138 Просмотр технического описания (PDF) - Micro Analog Systems Oy
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MAS9138 Datasheet PDF : 10 Pages
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DA9138.005
12 April, 2006
APPLICATION INFORMATION
Data multiplexer
A third application is a data multiplexing/demultiplexing system. The system accepts data from several sources.
These data lines are sampled and the samples are sent through a multiplexer to a demultiplexer. To accomplish this,
either a very high sample rate is needed or first convert the data to synchronous mode, where synchronous
multiplexing can be used and only one sample per data bit is needed.
CH 1
TDI
RDO
MAS9138
1
TDO
RDI
RDI
TDO
MAS9138
1
RDO
TDI
CH 2
MAS9138
2
MUX/
DEMUX
FORWARD
BACKWARD
MUX/
DEMUX
MAS9138
2
TIMING
CH N
N
N
Synchronous modem with asynchronous interface
The following application shows how to add an asynchronous interface to a synchronous modem with MAS9138. TSL
and XHST inputs (pins 1 and 12) are connected to VDD. If the crystal is removed and the external 16 x TXC clock
signal is used (dotted line) then tie the TSL input to ground. CL1, Cl2, XASY and XHST are user adjustable with
jumpers or dip switches.
RS232C
TXD
RXD
+5v
Synchronous
Modem
TTL/V28
470pF
78189A
470pF
TTL/V28
75189A
-12v +12v
TDI
9
16
10
4
14
RDO
+5v
TSL
XHST
15
13
MAS9138 2
1
12
TDO TTL-Level
TXC TTL-Level
RDI TTL-Level
RXC TTL-Level
*)
22pF
Ext. Signal Rate 7
Char. Length 5
Char. Length 6
ASY/SYN Select 11
8
CR 1
9.8304MHz
3
22pF
TXC
16 x TXC
RXC
Modem
Timing
Circuit
mode
selection
jumpers
*) Optional timing from the
synchronous modem.
In this case CR 1 can be
eliminated.
MAS9138 simplified application:
V.28 interface for synchronous modem
8 (10)
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