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參數(shù)資料
| 型號(hào)： | HC5515CMZ |
| 廠商： | Intersil |
| 文件頁數(shù)： | 2/20頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC SLIC ITU CO/PABX LP 28-PLCC |
| 標(biāo)準(zhǔn)包裝： | 925 |
| 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 |
| 功率（瓦特）： | 1.5W |
| 工作溫度： | 0°C ~ 70°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： | 可編程回路電流檢測(cè)器，振鈴?fù)禉z測(cè)器，熱關(guān)機(jī) |
10
FN4235.6
June 6, 2006
on tip and -4V on ring, for a total of -8V margin, is
recommended as a general guideline. The value of RSG is
calculated using Equation 6:
where:
VBAT = Battery voltage, and
VMAR = Voltage Margin. Recommended value of -8V to
allow a maximum overload level of 3.1VPEAK.
For on-hook transmission RL = ∞, Equation 6 reduces to:
SLIC in the Standby Mode
Overall system power is saved by configuring the SLIC in the
standby state when not in use. In the standby state the tip
and ring amplifiers are disabled and internal resistors are
connected between tip to ground and ring to VBAT. This
connection enables a loop current to flow when the phone
goes off-hook. The loop current detector then detects this
current and the SLIC is configured in the active mode for
voice transmission. The loop current in standby state is
calculated as follows:
where:
IL = Loop current in the standby state,
RL = Loop resistance, and
VBAT = Battery voltage.
(AC) Transmission Path
SLIC in the Active Mode
Figure 15 shows a simplified AC transmission model. Circuit
analysis yields the following design equations:
where:
VTR = Is the AC metallic voltage between tip and ring,
including the voltage drop across the fuse resistors RF,
VTX = Is the AC metallic voltage. Either at the ground
referenced 4-wire side or the SLIC tip and ring terminals,
IM = Is the AC metallic current,
RF = Is a fuse resistor,
ZT = Is used to set the SLIC’s 2-wire impedance,
VRX = Is the analog ground referenced receive signal,
ZRX = Is used to set the 4-wire to 2-wire gain,
EG = Is the AC open circuit voltage, and
ZL = Is the line impedance.
(AC) 2-Wire Impedance
The AC 2-wire impedance (ZTR) is the impedance looking
into the SLIC, including the fuse resistors, and is calculated
as follows:
Let VRX = 0. Then from Equation 10:
ZTR is defined as:
Substituting in Equation 9 for VTR:
Substituting in Equation 12 for VTX:
Therefore:
Equation 16 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.
RF =20.
ZT = 560k in series with 2.16nF.
(AC) 2-Wire to 4-Wire Gain
The 2-wire to 4-wire gain is equal to VTX/ VTR.
From Equations 9 and 10 with VRX = 0:
(AC) 4-Wire to 2-Wire Gain
The 4-wire to 2-wire gain is equal to VTR/VRX.
From Equations 9, 10 and 11 with EG = 0:
R
SG
510
5
V
BAT
V
MAR
–
()
1
R
DC1
R
DC2
+
()
600R
L
----------------------------------------------
+
16.66V
–
×
----------------------------------------------------------------------------------------------------------------------------------------------
17300
–
=
(EQ. 6)
R
SG
510
5
V
BAT
V
MAR
16.66V
–
------------------------------------------------------------------
17300
–
=
(EQ. 7)
I
L
V
BAT
3V
–
R
L
1800
+
--------------------------------
≈
(EQ. 8)
V
TR
V
TX
I
M
2R
F
+
=
(EQ. 9)
V
TX
Z
T
-----------
V
RX
Z
RX
-----------
+
I
M
1000
-------------
=
(EQ. 10)
V
TR
E
G
I
M
Z
L
–
=
(EQ. 11)
V
TX
Z
T
I
M
1000
-------------
=
(EQ. 12)
Z
TR
V
TR
I
M
-----------
=
(EQ. 13)
Z
TR
V
TX
I
M
-----------
2R
F
I
M
I
M
-----------------------
+
=
(EQ. 14)
Z
TR
Z
T
1000
-------------
2R
F
+
=
(EQ. 15)
Z
T
1000
Z
TR
2R
F
–
()
=
(EQ. 16)
Z
T
1000
600
1
j
ω 2.16
10
6
–
-----------------------------------------
220
–
+
=
A
24
–
V
TX
V
TR
-----------
Z
T 1000
Z
T 1000
2R
F
+
------------------------------------------
==
(EQ. 17)
A
42
–
V
TR
V
RX
-----------
Z
T
Z
RX
-----------
–
Z
L
Z
T
1000
-------------
2R
F
Z
L
++
--------------------------------------------
==
(EQ. 18)
HC5515
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