參數(shù)資料
型號(hào)： HC55183
廠商： Intersil Corporation
英文描述： Extended Reach Ringing SLIC Family
中文描述： 大位移振鈴用戶(hù)接口家庭
文件頁(yè)數(shù)： 18/19頁(yè)
文件大?。?/td> 158K
代理商： HC55183
45
Additional Application Diagrams
Reducing Overhead Voltages
The transmission overhead voltage of the device is internally
set to 4V per side. The overhead voltage may be reduced by
injecting a negative DC voltage on the receive input using a
voltage divider (Fig. 19). Accordingly, the 2-wire port overload
level will decrease the same amount as the injected offset.
The divider shunt resistance is the parallel combination of
the internal 160k
resistor and the external R
2
. The sum of
R
1
and R
2
should be greater than 500k
to minimize the
additional power dissipation of the divider. The DC gain
relationship from the divider voltage, V
D
, to the Tip and Ring
outputs is shown below.
With a low battery voltage -24V and a divider voltage of
-0.5V, the Tip to Ring voltage is 17V. As a result, the
overhead voltage is reduced from 8V to 7V and the overload
level will decrease from 3.5V
PEAK
to 3.0V
PEAK
.
CODEC Ringing Generation
Maximum ringing amplitudes of the device are achieved with
signal levels approximately 2.4V
P-P
. Therefore the low pass
receive output of the CODEC may serve as the low level ring
generator. The ringing input impedance of 480k
minimum
should not interfere with CODEC drive capability. A single
external capacitor is required to AC coupled the ringing
signal from the CODEC. The circuit diagram for CODEC
ringing is shown below.
Implementing Teletax Signalling
A resistor, R
T
, is required at the -IN input of the device for
injecting the teletax signal (Figure 20). For most
applications the synthesized device impedance (i.e., 600
)
will not match the 200
teletax impedance. The gain set by
R
T
cancels the impedance matching feedback with respect
to the teletax injection point. Therefore the device appears
as a low impedance source for teletax. The resistor R
T
is
calculated using the following equation.
P
The signal level across a 200
load will be twice the injected
teletax signal level. As the teletax level at VTX will equal the
injection level, set R
C
= R
B
for cancellation. The value of R
B
is based on the voice band transhybrid balance
requirements. The connection of the teletax source to the
transhybrid amplifier should be AC coupled to allow proper
biasing of the transhybrid amplifier input
Ringing With DC Offsets
The balanced ringing waveform consists of zero DC offset
between the Tip and Ring terminals. However, the linear
amplifier architecture provides control of the DC offset
during ringing. The DC gain is the same as the AC gain,
40V/V per amplifier. Positive DC offsets applied directly to
the ringing input will shift both Tip and Ring away from half
battery towards ground and battery respectively. A voltage
divider on the ringing input may be used to generate the
offset (Figure 22). The reference voltage, V
REF
, can be
either the CODEC 2.4V reference voltage or the 5V supply.
An offset during ringing of 30V, would require a DC shift of
15V at Tip and 15V at Ring. The DC offset would be created
by a +0.375V (V
D
) at the VRS input. The divider resistors
should be selected to minimize the value of the AC coupling
capacitor C
RS
and the loading of the ring generator and
voltage reference. The ringing input impedance should also
be accounted for in divider resistor calculations.
FIGURE 19. EXTERNAL OVERHEAD CONTROL
HC5518X
VBL
FROM
CODEC
R
2
R
1
C
RX
V
D
160 k
1:1
VRX
V
T
R
–
V
BL
8
2
V
D
×
(
)
–
–
=
(EQ. 38)
FIGURE 20. CODEC RINGING INTERFACE
HC5518X
RX OUT
CODEC
160 k
1:1
VRS
+
-
480K
VRX
R
T
S
)
+
----------+
R
S
×
=
(EQ. 39)
FIGURE 21. TELETAX SIGNALLING
+
-
R
F
R
B
CODEC
+2.4V
TX IN
-IN
VFB
VTX
+
-
RS
CFB
TA
RT
R
C
TELETAX
SOURCE
FIGURE 22. EXTERNAL OVERHEAD CONTROL
V
REF
FROM
RING GEN.
R
2
R
1
C
RS
V
D
HC5518X
VRS
+
-
480K
HC55180, HC55181, HC55182, HC55183, HC55184
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PDF描述
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
HC55183ECM 制造商:Rochester Electronics LLC 功能描述: 制造商:Intersil Corporation 功能描述:
HC55183ECMZ 功能描述:電信線路管理 IC 75V RINGING SLIC W/BAT SWITCH POLV LB RoHS:否 制造商:STMicroelectronics 產(chǎn)品:PHY 接口類(lèi)型:UART 電源電壓-最大:18 V 電源電壓-最小:8 V 電源電流:30 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VFQFPN-48 封裝:Tray
HC55183ECMZ96 功能描述:電信線路管理 IC HC55183ECMEL RoHS:否 制造商:STMicroelectronics 產(chǎn)品:PHY 接口類(lèi)型:UART 電源電壓-最大:18 V 電源電壓-最小:8 V 電源電流:30 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VFQFPN-48 封裝:Tray
HC55184 制造商:INTERSIL 制造商全稱(chēng):Intersil Corporation 功能描述:Extended Reach Ringing SLIC Family
HC55184ECM 制造商:Rochester Electronics LLC 功能描述: 制造商:Intersil Corporation 功能描述:
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