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參數(shù)資料
| 型號： | PBL38773/1ML |
| 廠商： | INFINEON TECHNOLOGIES AG |
| 元件分類： | 模擬傳輸電路 |
| 英文描述： | TELECOM-SLIC, PQCC32 |
| 封裝： | PLASTIC, VQFN-32 |
| 文件頁數(shù)： | 19/64頁 |
| 文件大?。?/td> | 1052K |
| 代理商： | PBL38773/1ML |
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Ringing FlexiSLIC
PBL 38773/1
Functional Description and Applications Information
Data Sheet
26
DS1, 2003-06-18
4
Functional Description and Applications Information
This chapter describes the Functional Description and Applications Information of the
surrounding components.
4.1
Introduction
This SLIC is suitable in short loop power sensitive applications like, Cable modem, Voice
over DSL, ISDN terminal adapter (NT1+), Voice over IP, Integrated Access Device
(IAD), Residential Gateway or other short loop applications. The Figure 8 shows the
PBL 38773/1 in a typical application with a non-programmable, Combo I, codec. The
SLIC can equally well be used with programmable codecs. The component values
chosen for the application diagram example yield a two-wire impedance of 600
,
resistive. The balance resistor,
R
T, is calculated for line impedance, ZL (compromise
impedance), of 600
. The transmit gain is set by R
TX and RFB (those resistors value are
codec specific) to produce the digital mW level at the PCM transmit bus.
R
F1, RF2 , CGG and the clamp “OVP” make up the overvoltage protection network.
Table 6
Functional Description
Component
Function
C
TC and CRC
Clamp fast transients that may bypass the OVP clamp and also
filter high frequency interference (RFI filter).
C
HP and CLP
Are coupling capacitors within two SLIC feedback loops that
control SLIC battery feed and SLIC voice frequency transmission.
C
TB, CB, CVCC
Are power supply bypass capacitors.
D
TB
Is a diode that is part of the battery switching function.
D
B
Prevents reverse currents from the
V
B supply rail during application
of negative over voltages.
D
BB
Is normally reverse biased, but conducts supply
V
TB to the VBAT
terminal in case the voltage
V
B would fail.
R
T
Sets the two-wire impedance (note that
R
T may be replaced with a
complex impedance,
Z
T, to implement complex terminating
impedance).
R
RX
Sets the receive gain.
R
LD
Sets the loop current detector threshold.
R
LC
Sets the constant DC loop current.
R
REF
Sets a SLIC reference current (must be 15.0 k
, 1%, as specified).
R
RT
Sets the ring trip loop current detector threshold.
相關(guān)PDF資料 |
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