參數(shù)資料
型號(hào)： HC55131IM
廠商： INTERSIL CORP
元件分類： 模擬傳輸電路
英文描述： IC-VLTG REG+12V TO220 ISO
中文描述： TELECOM-SLIC, PQCC32
封裝： PLASTIC, MS-016AE, LCC-32
文件頁(yè)數(shù)： 24/35頁(yè)
文件大小： 382K
代理商： HC55131IM
4-24
Interface to Dual and Single Supply
CODECs
Great care has been taken to minimize the number of external
components required with the UniSLIC14 family while still
providing the maximum flexibility. Figures 24A, 24B) shows
the connection of the UniSLIC14 to both a dual supply
CODEC/Filter and a single supply DSP CODEC/Filter.
To eliminate the DC blocking capacitors between the SLIC
and the CODEC/Filter when using a dual supply
CODEC/Filter, both the receive and transmit leads of the
SLIC are referenced to ground. This leads to a very simple
SLIC to CODEC/Filter interface, as shown in Figure 24A.
When using a single supply DSP CODEC/Filter the output
and input of the CODEC/Filter are no longer referenced to
ground. To achieve maximum voltage swing with a single
supply, both the output and input of the CODEC/Filter are
referenced to its own V
CC
/2 reference. Thus, DC blocking
capacitors are once again required. By using the PTG pin of
the UniSLIC14 and the externally supplied V
CC
/2 reference
of the CODEC/Filter, one of the DC blocking capacitors can
be eliminated (Figure 24B).
Power Management
The UniSLIC14 family provides two distinct power
management capabilities:
Power Sharing and Battery Selection
Power Sharing
Power sharing is a method of redistributing the power away
from the SLIC in short loop applications. The total system
power is the same, but the die temperature of the SLIC is
much lower. Power sharing becomes important if the
application has a single battery supply (-48V on hook
requirements for faxes and modems) and the possibility of
high loop currents (reference Figure 25). This technique
would prevent the SLIC from getting too hot and thermally
shutting down on short loops.
The power dissipation in the SLIC is the sum of the smaller
quiescent supply power and the much larger power that
results from the loop current. The power that results from the
loop current is the loop current times the voltage across the
SLIC. The power sharing resistor (R
PS
) reduces the voltage
across the SLIC, and thereby the on-chip power dissipation.
The voltage across the SLIC is reduced by the voltage drop
across R
PS
. This occurs because R
PS
is in series with the
loop current and the negative supply.
A mathematical verification follows:
Given: V
BH
= V
BL
= -48V, Loop current = 30mA, R
L
(load
across tip and ring) = 600
, Quiescent battery power =
(48V) (0.8mA) = 38.4mW, Quiescent VCC power = (5V)
(2.7mA) = 13.5mW, Power sharing resistor = 600
.
1. Without power sharing, the on-chip power dissipation
would be 952mW (Equation 41).
2. With power sharing, the on-chip power dissipation is
412mW (Equation 42). A power redistribution of 540mW.
On-chip power dissipation without power sharing resistor.
On-chip power dissipation with 600
power sharing resistor.
(
)
30mA
(
)
38.4mW
+
+
=
)
2
–
R
PS
The design trade-off in using the power sharing resistor is
loop length vs on-chip power dissipation.
FIGURE 24A.
FIGURE 24B.
FIGURE 24. INTERFACE TO DUAL AND SINGLE SUPPLY
CODECs
V
TX
+
-
A = 1
V
RX
UniSLIC14
V
OUT
DUAL SUPPLY
CODEC/FILTER
+
-
5V
GND
-5V
V
TX
500K
PTG
+
-
A = 1
500K
V
RX
UniSLIC14
SINGLE SUPPLY
DSP
CODEC/FILTER
5V
GND
V
IN
V
OUT
V
REF
PD
V
BH
(
)
30mA
(
)
38.4mW
13.5mW
RL
(
)
30mA
(
)
2
–
+
+
=
(EQ. 41)
PD
952mW
=
PD
V
BH
(
13.5mW
)
2
(EQ. 42)
R
L
)
30mA
(
(
)
30mA
(
–
PD
412mW
=
FIGURE 25. POWER SHARING (SINGLE SUPPLY SYSTEMS)
V
TX
V
RX
UniSLIC14
TIP
RING
V
BL
V
BH
-48V
-48V
ON SHORT LOOPS, THE
MAJORITY OF CURRENT
FLOWS OUT THE V
BL
PIN
R
PS
HC55120, HC55121, HC55130, HC55131, HC55140, HC55141, HC55142, HC55143, HC55150, HC55151
相關(guān)PDF資料
PDF描述
HC55151CM Low Power Universal SLIC Family
HC5514XEVAL1 Aluminum Electrolytic Capacitor; Capacitor Type:General Purpose; Voltage Rating:50VDC; Capacitor Dielectric Material:Aluminum Electrolytic; Operating Temperature Range:-40 C to +85 C; Body Diameter:6.3mm; Body Length:5.4mm RoHS Compliant: No
HC55142IB XTAL CER SMT 11X5 4PAD
HC5513BIP TVS 1500W 43V UNIDIRECT SMC
HC5513 Bipolar Transistor; Package/Case:TO-220; Current Rating:7A; Voltage Rating:80V RoHS Compliant: Yes
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
HC5513BIM 功能描述:IC SLIC DLC/FLC LP STDBY 22-DIP RoHS:否 類別:集成電路 (IC) >> 接口 - 電信 系列:UniSLIC14 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS 產(chǎn)品變化通告:Product Discontinuation 06/Feb/2012 標(biāo)準(zhǔn)包裝:750 系列:*
HC5513BIM96 制造商:Rochester Electronics LLC 功能描述:- Bulk
HC5513BIMX6176C 制造商:Rochester Electronics LLC 功能描述:- Bulk
HC5513BIP 制造商:Rochester Electronics LLC 功能描述:- Bulk
HC5513IMR4465 制造商:Rochester Electronics LLC 功能描述:- Bulk
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*