參數(shù)資料
型號(hào)： 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(yè)數(shù)： 29/64頁(yè)
文件大小： 1052K
代理商： PBL38773/1ML
Ringing FlexiSLIC
PBL 38773/1
Transmission
Data Sheet
35
DS1, 2003-06-18
The SLIC longitudinal impedance per wire,
Z
LOT and ZLOR, appears as typically 20 to
longitudinal disturbances. It should be noted that longitudinal currents may exceed the
DC loop current without disturbing the vf transmission.
5.8
Capacitors
C
TC and CRC (Optional)
The primary function of the capacitors
C
TC and CRC is as a part of the overvoltage
protection network. The overvoltage protection clamp may not respond quickly enough
to very fast transients and therefore damaging voltages may reach the SLIC pins TIPX
and RINGX.
C
TC and CRC will protect the SLIC by shorting such fast transients to ground.
C
TC and CRC may be utilized for RFI filtering when needed. CTC and CRC form RFI filters
in conjunction with suitable series impedances (i.e. resistances, inductances). Resistors
R
F1 and RF2 may be sufficient, but series inductances can be added to form a second
order filter. Current-compensated inductors (common mode chokes) are suitable since
they impose little metallic impedance but high longitudinal impedance, therefore having
minimum influence on two-wire transmission. Recommended values for
C
TC and CRC are
1 nF or less. Lower values implies less influence on the return loss and less degradation
of the longitudinal balance caused by missmatching between
C
TC and CRC. On the other
hand with lower values of
C
TC and CRC will decrease the attenuation of longitudinal
induced radio frequencies. The influence of these capacitors on the two-wire terminating
impedance must be considered when selecting a value for
C
TC = CRC. CTC and CRC
contribute to a metallic impedance of 1/(2
π× f × C
TC) = 1/(2π× f × CRC), a TIPX to
ground impedance of 1/(2
π× f × C
TC)
and a RINGX to ground impedance of
1/(2
π× f × C
RC).
5.9
AC - DC Separation Capacitor,
C
HP
The high pass filter capacitor connected between terminals HP and TIPX provides the
separation of the AC and DC signals, such that only AC signals are forwarded to the VTX
terminal.
C
HP positions the low end frequency response break point of the AC feedback
loop in the SLIC. The
C
HP value of 33 nF will position the low end frequency response
3 dB break point of the AC loop at 12 Hz (
f
3dB) according to f3dB = 1/(2π × RHP × CHP)
where
R
HP = 400 k.
5.10
Capacitor
C
LP
The capacitor
C
LP, which connects between the terminals LP and VTBAT, positions the
high end frequency break point of the low pass filter in the DC feedback loop (battery
feed controlling loop) of the SLIC. Both
C
LP and CHP influence the two-wire impedance
at low frequencies (primarily below the vf band) by adding an impedance in parallel with
the programmed two-wire impedance (set by
R
T and/or the Z-filter in the codec). The
SLIC SPICE model includes the effects of
C
LP and CHP on the vf transmission. The CLP
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