voltage at the load (VOH
參數(shù)資料
型號(hào)： HC55142IMZ
廠商： Intersil
文件頁數(shù)： 7/36頁
文件大小： 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
15
FN4659.13
June 1, 2006
On Hook Overhead Voltage
The on hook overhead
voltage at the load (VOH(on)
at Load) is independent of the
VBH battery voltage. Once
set, the on hook voltage
remains constant as the VBH
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 (ISHD). 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 (RP) and the 2
internal sense resistors (RS) as shown in Figure 16. The AC
on hook overload voltage is calculated using Equation 1.
where
VOH(on) at Load = On hook overhead voltage at load
Vsp(on) = Required on hook transmission for speech
RP = Protection Resistors (Typically 30)
RS = Internal Sense Resistors (40)
ZL = 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.
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
RL
OO
P(m
ax)
SLIC SELF PROGRAMMING
TIP
TO
RING
ABSOL
UTE
VOLTAGE
(V
)
LOOP CURRENT (mA)
IOH
CONSTANT
CURRENT
REGION
RSAT
VOH(on) AT LOAD
ISHD
VBH
VOH(on)
2.5V
ON HOOK
ISH-
T
IP
TO
RI
NG
VOLTA
GE
LOOP CURRENT
DC FEED CURVE
OVERHEAD
ISH- = ISHD(0.6)
ISHD
(EQ. 1
V
OH on
() at Load
V
sp on
()
1
2R
P
2R
S
+
Z
L
------------------------------
+
×
1.5V
+
=
FIGURE 16. OVERHEAD VOLTAGE OF THE TIP AND RING
AMPLIFIERS
TIP AND RING
INTERNAL SENSE
EXTERNAL PROTECTION
RESISTOR
2RP
2RS
AMPLIFIERS
OVERHEAD VOLTAGE
RESISTORS
Where:
ZL
REQUIRED
VOH (ON, OFF)
VZL is the required on hook or offhook
transmission delivered to the load.
(LOAD)
UniSLIC14
VZL
V
OH ON OFF
,
()
2R
P
2R
S
+
Z
L
------------------------------
V
ZL
=
HC55120, HC55121, HC55130, HC55140, HC55142, HC55143, HC55150
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