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參數(shù)資料
| 型號(hào)： | HC55140 |
| 廠商： | Intersil Corporation |
| 英文描述： | Low Power Universal SLIC Family |
| 中文描述： | 低功耗通用用戶接口家庭 |
| 文件頁(yè)數(shù)： | 14/35頁(yè) |
| 文件大小： | 382K |
| 代理商： | HC55140 |
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4-14
On Hook Overhead Voltage
The on hook overhead voltage
at the load (V
OH
(on) at Load)
is independent of the V
BH
battery voltage. Once set, the
on hook voltage remains
constant as the V
BH
battery
voltage changes. The on hook
voltage also remains constant
over temperature and line
leakages up to 0.6 times the
Switch Hook Detect threshold (I
SHD
). The maximum loop
current for a constant on hook overhead voltage is defined
as ISH-.
The on hook overhead voltage, required for a given signal
level at the load, must take into account the AC voltage drop
across the 2 external protection resistors (R
P
) and the 2
internal sense resistors (R
S
) as shown in Figure 16. The AC
on hook overload voltage is calculated using Equation 1.
where
V
OH(on) at Load
= On hook overhead voltage at load
V
sp(on)
= Required on hook transmission for speech
R
P
= Protection Resistors (Typically 30
)
R
S
= Internal Sense Resistors (40
)
Z
L
= AC load impedance for (600
)
1.5V = Additional on hook overhead voltage requirement
To account for any process and temperature variations in the
performance of the SLIC, 1.5V is added to the overhead
voltage requirement for the on hook case in Equation 1 and
2.0V for the off hook case in Equation 3. Note the 2.5V
overhead is automatically generated in the SLIC and is not
part of the external overhead programming.
Off Hook Overhead Voltage
The off hook overhead
voltage V
OH
(off) at Load is
also independent of the V
BH
battery voltage and remains
constant over temperature.
The required off hook
overhead voltage is the sum
of the AC and DC voltage
drops across the internal
sense resistors (R
S)
, the
Internal overhead voltage automatically generated by the SLIC.
FIGURE 15. UniSLIC14 DC FEED CURVE
VBH
2.5V
VOH(off) AT LOAD
ISH-
ILOOP(min)
ILOOP(max)
60k
SLOPE
RLOOP(max)
SLIC SELF PROGRAMMING
T
LOOP CURRENT (mA)
IOH
CONSTANT
CURRENT
REGION
R
SAT
VOH(on) AT LOAD
I
SHD
V
BH
V
OH(on)
2.5V
ON HOOK
OVERHEAD
ISH-
LOOP CURRENT
T
DC FEED CURVE
ISH- = I
SHD
(0.6)
I
SHD
(EQ. 1)
V
OH on
)
at Load
V
sp on
)
1
2R
-----------------------------
2R
S
+
L
+
×
1.5V
+
=
FIGURE 16. OVERHEAD VOLTAGE OF THE TIP AND RING
AMPLIFIERS
TIP AND RING
AMPLIFIERS
INTERNAL SENSE
RESISTORS
EXTERNAL PROTECTION
RESISTOR
2R
P
2R
S
OVERHEAD VOLTAGE
V
OH
(ON, OFF)
Where:
V
ZL
is the required on hook or offhook
transmission delivered to the load.
Z
L
REQUIRED
(LOAD)
UniSLIC14
V
ZL
V
OH ON OFF
)
2R
-----------------------------
2R
S
+
L
V
ZL
=
V
BH
V
SAT
V
OH(off)
2.5V
OFF HOOK
OVER HEAD
T
LOOP CURRENT
I
LOOP(min)
DC FEED CURVE
HC55120, HC55121, HC55130, HC55131, HC55140, HC55141, HC55142, HC55143, HC55150, HC55151
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| HC55140IB | Low Power Universal SLIC Family |
| HC55140IM | Low Power Universal SLIC Family |
| HC55141 | Low Power Universal SLIC Family |
| HC55141IM | Low Power Universal SLIC Family |
| HC55142 | Low Power Universal SLIC Family |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| HC55140IB | 制造商:Rochester Electronics LLC 功能描述: 制造商:Intersil Corporation 功能描述: |
| HC55140IBZ | 功能描述:電信線路管理 IC LW PWR SLIC POLV 63DB BALANCE RoHS:否 制造商:STMicroelectronics 產(chǎn)品:PHY 接口類型: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 |
| HC55140IM | 制造商:Rochester Electronics LLC 功能描述:LOW PWR SLIC,POL REV,63DB BALANCE - Bulk |
| HC55140IMZ | 功能描述:電信線路管理 IC LW PWR SLIC POLV 63DB BALANCE RoHS:否 制造商:STMicroelectronics 產(chǎn)品:PHY 接口類型: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 |
| HC55141 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:Low Power Universal SLIC Family |
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