參數(shù)資料
型號(hào)： PEF24902
英文描述： ISDN Line Interface
中文描述： ISDN線路接口
文件頁(yè)數(shù)： 36/73頁(yè)
文件大?。?/td> 1618K
代理商： PEF24902
PEB 2466
PEF 2466
Interface Description
Hardware Reference Manual
27
2001-02-20
5
Interface Description
The SICOFI
4-μC provides four interfaces:
Analog Interface,
PCM Interface,
Signaling Interface, and
Serial Microcontroller Interface.
A general description of these interface is given in the
Product Overview
, Chapter 4
.
Refer to the
Programmers Reference Manual
for information on the configuration and
operation of the four interfaces.
The subsequent chapters in this manual explain how to connect the SICOFI
4-μC to
subscriber line interface circuits (SLICs), microcontrollers, and PCM highways.
5.1
Analog Interface
The Analog Interface in combination with a Subscriber Line Interface Circuit (SLIC)
forms a configurable tip & ring (t/r) telephone line. The AC transmission characteristic of
the SICOFI
4-μC
—
SLIC combination can be controlled by programming the digital filter
structures inside the SICOFI
4-μC. The correct filter coefficients are determined by the
targeted AC transmission behavior (e.g. Telco specification) and by the transfer
functions of the SLIC.
The SICOFI
4-μC can be interfaced directly to electronic SLICs or transformer solutions.
The high driving capability of up to 300 Ohms eliminates the need for an external
amplifier that is normally used with transformer SLICs.
The peak amplitude of the analog inputs and outputs is at 2.223 V (overload point).
Out-of-band signals applied to the analog inputs are suppressed by the on-chip digital
hardware filters. The poles of these filters are fixed at 12 kHz and 16 kHz which
suppresses the echo signal from teletax pulses very efficiently: As long as the amplitude
of the teletax echo stays below the overload threshold of 2.223 Vp (1.57 Vrms), the voice
signal in the transmit path will not be disturbed. Thus, the on-chip hardware filters can
eliminate the need for external teletax filters.
5.1.1
Coupling Capacitors at the Analog Interface
A coupling capacitor >39 nF must be used on the
V
IN
-pins in the transmit direction. The
required value for the coupling capacitor on the
V
OUT
-pins depends on the input
resistance of the SLIC-circuitry (
R
Load
). It has to be chosen to fulfil the frequency
response requirement in the receive direction.
Figure 16
can be used to determine an
appropriate value for the coupling capacitor (
C
Ext1
).
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