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ISL83740EVAL Datasheet(PDF) 6 Page - Intersil Corporation

Part # ISL83740EVAL
Description  Modem Reference Designs
Download  25 Pages
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Manufacturer  INTERSIL [Intersil Corporation]
Direct Link  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

ISL83740EVAL Datasheet(HTML) 6 Page - Intersil Corporation

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Func t i o n a l De s c r i pt ion
ISL837030, ISL83740
6
FN8013.5
Demodulator (Continued)
6. Automatic Gain Control (AGC)
The demodulator ASSP provides a parallel data word to be
used by the AGC to optimize the dynamic range of the input
signal to the demodulator. The ASSP averages the
magnitude of the input baseband signal, subtracts that from a
target value, and accumulates the results. The AGC value is
available in either serial digital or analog form. The AGC
value output is proportional to the amount by which the
incoming signal’s amplitude must be increased in order for its
level to reach the desired target. Therefore, an increase in
the AGC value indicates that the signal level at the input to
the AGC amplifier/attenuator has actually decreased. The
modem operates in two different AGC modes:
• Open loop is used when there is no external AGC loop
implemented.
• Closed loop is used when the modem’s AGC features
are tobeused.
For best performance, closed loop mode is suggested. This
automatically sets the demodulator input level to the optimum
value. The system default is open loop mode until any AGC
parameter is initialized from the host.
The Controller
The Controller is a highly integrated device used to eliminate
the complexities of interfacing with the Intersil ASSPs
directly. It incorporates everything necessary to control and
monitor the modem.
The Controller’s processor takes high-level commands from
the user and determines what is required to configure and
monitor the ASSPs. This relieves the user from any real-time
interfacing and algorithm implementation issues.
Theexecutablefirmwareis heldinFLASH memory that is in-
circuit upgradeable. This allows the user to upgrade the code
or load in a new algorithm as required via the asynchronous
serial port (the Monitor and Control port).
Monitor and Control Software
The modem PCBA is configured and monitored using
Intersil’s embedded Monitor and Control (M&C) software.
This software is used to set parameters such as:
• modulation type
• code rate
• payload rate
•symbol rate
• output level/offset
• AGC control
• diagnostics
self-test
loopback
•alarms
• baseband loopback
• Alpha (pulse shape)
• statistics
BER
EVM
demodulator stress
phase & amplitude imbalance
•and more
For details, see the Programmer’s Reference AN9935.


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