Substituting Equation 21 for VTR in Equation 30 and si" />
參數(shù)資料
型號(hào)： HC55130IMZ
廠商： Intersil
文件頁(yè)數(shù)： 11/36頁(yè)
文件大?。?/td> 0K
描述： IC SLIC UNIVERSAL LP 28-PLCC
標(biāo)準(zhǔn)包裝： 37
系列： UniSLIC14
功能： 用戶線路接口概念（SLIC）
電路數(shù)： 1
電源電壓： 4.75 V ~ 5.25 V
電流 - 電源： 2.25mA
功率（瓦特）： 1.5W
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 28-LCC（J 形引線）
供應(yīng)商設(shè)備封裝： 28-PLCC（11.51x11.51）
包裝： 管件
包括： 電池跟蹤抗削頂失真，回路和接地鍵檢測(cè)，振鈴控制
19
FN4659.13
June 1, 2006
Substituting Equation 21 for VTR in Equation 30 and
simplifying results in Equation 31.
(AC) 2-Wire Impedance
The AC 2-wire impedance (ZTR) is the impedance looking
into the SLIC, including the fuse resistors. The formula to
calculate the proper ZT for matching the 2-wire impedance is
shown in Equation 32.
Equation 32 can now be used to match the SLIC’s
impedance to any known line impedance (ZTR).
EXAMPLE:
Calculate ZT to make ZTR = 600 in series with 2.16F.
RP = 30.
ZT = 108k in series with 0.0108F.
Note: Some impedance models, with a series capacitor, will
cause the op-amp feedback to behave as an open circuit
DC. A resistor with a value of about 10 times the reactance
of the ZT capacitor (2.16F/200 = 10.8nF) at the low
frequency of interest (200Hz for example) can be placed in
parallel with the capacitor in order to solve the problem
(736k
for a 10.8nF capacitor).
Calculating Tip and Ring Voltages
The on hook tip to ground voltage is calculated using
Equation 34. The minus 1.0 volt results from the SLIC self
programming. ISH- is the maximum loop current for a
constant on hook overhead voltage (ISH- = ISHD(0.6)) and
the value of RSAT(off) is calculated in Equation 4.
On hook Tip Voltage
The off hook tip to ground voltage is calculated using
Equation 35. ILOOP(min) is the minimum loop current
allowed by the design and the value of RSAT(off) is
calculated in Equation 4.
Off hook Tip Voltage
The on hook ring to ground voltage is calculated using
Equation 36. The 1.5 volt results from the SLIC self
programming. ISH- is the maximum loop current for a
constant on hook overhead voltage (ISH- = ISHD(0.6)) and
the value of RSAT(off) is calculated in Equation 4.
On hook Ring Voltage
The calculation of the ring voltage with respect to ground in
the off hook condition is dependent upon whether the SLIC
is in current limit or not.
The off hook ring to ground voltage (in current limit) is
calculated using Equation 37. ILIM is the programmed loop
current limit and RL is the load resistance across tip and ring.
The minus 0.2V is a correction factor for the 60k
slope in
Figure 15.
Off hook Ring Voltage in Current Limit
The off hook ring to ground voltage (not in current limit) is
calculated using Equation 38. The 1.5V results from the
SLIC self programming. ILOOP(min) is the minimum loop
current allowed by the design and the value of RSAT(off) is
calculated in Equation 4.
Off hook Ring Voltage not in Current Limit
Layout Considerations
Systems with Dual Supplies (VBH and VBL)
If the VBL supply is not derived from the VBH supply, it is
recommended that an additional diode be placed in series
with the VBH supply. The orientation of this diode is anode
on pin 8 of the device and cathode to the external supply.
This external diode will inhibit large currents and potential
damage to the SLIC, in the event the VBH supply is shorted
to GND. If VBL is derived from VBH then this diode is not
required. Suggested (not required) supply sequence VBH -
VBL- VCC.
Floating the PTG Pin
The PTG pin is a high impedance pin (500k
) that is used to
program the 2-wire to 4-wire gain to either 0dB or -6dB.
If 0dB is required, it is necessary to float the PTG pin. The
PC board interconnect should be as short as possible to
minimize stray capacitance on this pin. Stray capacitance on
this pin forms a low pass filter and will cause the 2-wire to
4-wire gain to roll off at the higher frequencies.
If a 2-wire to 4-wire gain of -6dB is required, the PTG pin
should be grounded as close to the device as possible.
G
44
–
V
TX
V
RX
-----------
2
–
Z
L+ 2RP
Z
L
Z
TR
+
------------------------
==
(EQ. 31)
Z
T
200
Z
TR
2R
P
–
()
=
(EQ. 32)
Z
T
200 600
1
j
ω2.16X10
6
–
-----------------------------------
2
() 30
()
–
+
=
(EQ. 33)
V
TIP onhook
()
1.0V
–
ISH-
()
–
R
SAToff
2
----------------------
+
=
(EQ. 34)
V
TIP offhook
()
1V
–
I
LOOP min
()
R
SAT off
()
2
--------------------------
–
=
(EQ. 35)
I
LOOP MAX
() RP
×
–
V
RING onhook
()
V
BH
1.5V
ISH
()
R
SAT off
()
2
--------------------------
++
=
(EQ. 36)
V
RING CL
()
V
TIP offhook
() ILOOP MAX
()RL
–
0.2V
–
=
(EQ. 37)
V
RING NCL
()
V
BH
1.5V
I
LOOP min
()
R
SAT off
()
2
--------------------------
++
=
(EQ. 38)
I
LOOP MIN
() RP
×
–
HC55120, HC55121, HC55130, HC55140, HC55142, HC55143, HC55150
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