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PDF HC55184 Data sheet ( Hoja de datos )
| Número de pieza | HC55184 | |
| Descripción | Extended Reach Ringing SLIC Family | |
| Fabricantes | Intersil Corporation | |
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HC55180, HC55181, HC55182, HC55183, HC55184
Data Sheet
October 1998
File Number 4519.4
Extended Reach Ringing SLIC Family
The RSLIC18 family of
ringing subscriber line
interface circuits (RSLIC)
supports analog Plain Old
Telephone Service (POTS) in
short and medium loop length, wireless and wireline
applications. Ideally suited for remote subscriber units, this
family of products offers flexibility to designers with high
ringing voltage and low power consumption system
requirements.
The RSLIC18 family operates to 100V which translates
directly to the amount of ringing voltage supplied to the end
subscriber. With the high operating voltage, subscriber loop
lengths can be extended to 500Ω (i.e., 5,000 feet) and
beyond.
Other key features across the product family include: low
power consumption, ringing using sinusoidal or trapezoidal
waveforms, robust auto-detection mechanisms for when
subscribers go on or off hook, and minimal external discrete
application components. Integrated test access features are
also offered on selected products to support loopback
testing as well as line measurement tests.
There are five product offerings in the RSLIC18 family:
HC55180, HC55181, HC55182, HC55183 and HC55184.
The architecture for this family is based on a voltage feed
amplifier design using low fixed loop gains to achieve high
analog performance with low susceptibility to system
induced noise.
Block Diagram
POL CDC
VBL VBH
ILIM
DC
CONTROL
BATTERY
SWITCH
RINGING
PORT
VRS
TIP
RING
2-WIRE
PORT
TRANSMIT
SENSING
4-WIRE
PORT
VRX
VTX
-IN
VFB
SW+
SW-
TEST
ACCESS
DETECTOR
LOGIC
CONTROL
LOGIC
F2
F1
F0
RTD RD E0 DET ALM BSEL SWC
Features
• Battery Operation to 100V
• Low Standby Power Consumption of 50mW
• Peak Ringing Amplitude 95V, 5 REN
• Sinusoidal or Trapezoidal Ringing Capability
• Integrated CODEC Ringing Interface
• Integrated MTU DC Characteristics
• Low External Component Count
• Pulse Metering and On Hook Transmission
• Tip Open Ground Start Operation
• Thermal Shutdown with Alarm Indicator
• 28 Lead Surface Mount Packaging
• Dielectric Isolated (DI) High Voltage Design
• HC55180
- Silent Polarity Reversal
- 53dB Longitudinal Balance
- Loopback Test Capability
• HC55181
- Integrated Battery Switch
- Silent Polarity Reversal
- 58/53dB Longitudinal Balance
- Loopback and Test Access Capability
• HC55182
- Integrated Battery Switch
- 58/53dB Longitudinal Balance
- Loopback and Test Access Capability
• HC55183
- Integrated Battery Switch
- 45dB Longitudinal Balance
• HC55184
- Integrated Battery Switch
- Silent Polarity Reversal
- 45dB Longitudinal Balance
Applications
• Wireless Local Loop (WLL)
• Digital Added Main Line (DAML)/Pairgain
• Integrated Services Digital Network (ISDN)
• Small Office Home Office (SOHO) PBX
• Cable/Computer Telephony
Related Literature
• AN9814, User’s Guide for Development Board
• AN9824, Modeling of the AC Loop
• AN TBD, Interfacing to DSP CODECs
28 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
RSLIC18™ is a trademark of Intersil Corporation.
http://www.intersil.com or 407-727-9207 | Copyright © Intersil Corporation 1999
1 page  
HC55180, HC55181, HC55182, HC55183, HC55184
Electrical Specifications
Unless Otherwise Specified, TA = 0oC to 70oC for the HC55183, 184 only, all others -40oC to 85oC, VBL = -24V,
VBH = -100V, -85V or -75V, VCC = +5V, AGND = BGND = 0V, loop current limit = 25mA. All AC Parameters are
specified at 600Ω 2-wire terminating impedance over the frequency band of 300Hz to 3.4kHz. Protection
resistors = 0Ω. These parameters apply generically to each product offering. (Continued)
PARAMETER
TEST CONDITIONS
MIN TYP MAX UNITS
LOOP DETECTORS AND SUPERVISORY FUNCTIONS
Switch Hook Programming Range
5 - 15 mA
Switch Hook Programming Accuracy
Dial Pulse Distortion
Assumes 1% external programming resistor
- 2 10 %
- -1 %
Ring Trip Comparator Threshold
2.3 2.6 2.9
V
Ring Trip Programming Current Accuracy
- - 10 %
Ground Key Threshold
Thermal Alarm Output
IC junction temperature
10 12 13.5 mA
- 175 -
oC
LOGIC INPUTS (F0, F1, F2, E0, SWC)
Input Low Voltage
-
- 0.8
V
Input High Voltage
2.0 -
-
V
Input Low Current
Input High Current
LOGIC OUTPUTS (DET, ALM)
VIL = 0.4V
VIH = 2.4V
-20 - - µA
- - 5 µA
Output Low Voltage
Output High Voltage
POWER SUPPLY REJECTION RATIO
IOL = 5mA
IOH = 100 µA
- - 0.4
2.4 -
-
V
V
VCC to 2-Wire
f = 300Hz
f = 1kHz
- 40 -
- 35 -
dB
dB
f = 3.4kHz
- 28 -
dB
VCC to 4-Wire
f = 300Hz
f = 1kHz
- 45 -
- 43 -
dB
dB
VBL to 2-Wire
VBL to 4-Wire
VBH to 2-Wire
VBH to 4-Wire
f = 3.4kHz
300Hz ≤ f ≤ 3.4kHz
300Hz ≤ f ≤ 3.4kHz
300Hz ≤ f ≤ 3.4kHz
300Hz ≤ f ≤ 1kHz
1kHz < f ≤ 3.4kHz
- 33 -
- 30 -
- 35 -
- 33 -
- 40 -
- 45 -
dB
dB
dB
dB
dB
dB
NOTES:
2. These parameters are specified at high battery operation. For the HC55180 the external supply is set to high battery voltage, for the HC55181,
HC55182, HC55183 and HC55184, BSEL = 1.
3. These parameters are controlled via design or process parameters and are not directly tested. These parameters are characterized upon initial
design release and upon design changes which would affect these characteristics.
4. Differential Ringing Gain is measured with VRS = 0.795 VRMS for -100V devices, VRS = 0.663 VRMS for -85V devices and VRS = 0.575 VRMS
for -75V devices.
5. These parameters are specified at low battery operation. For the HC55180, the external supply is set to low battery voltage, for the HC55181,
HC55182, HC55183 and HC55184, BSEL = 0.
6. Forward Active and Reverse Active performance is guaranteed for the HC55180, HC55181 and HC55184 devices only. The HC55182 and
HC55183 are specified for Forward Active operation only.
32
5 Page 
HC55180, HC55181, HC55182, HC55183, HC55184
Voice Transmission
The feedback mechanism for monitoring the AC portion of
the loop current consists of two amplifiers, the sense
amplifier (SA) and the transmit amplifier (TA). The AC
feedback signal is used for impedance synthesis. A detailed
model of the AC feed back loop is provided below.
TIP
RING
R
20 -
+
R
VRX
R
1:1
20 +-
VTX
TA
RS
R 3R
3R
3R
3R
0.75R
- 8K
+ VSA
R/2
-IN
CFB
VFB
FIGURE 6. AC SIGNAL TRANSMISSION MODEL
The gain of the transmit amplifier, set by RS , determines the
programmed impedance of the device. The capacitor CFB
blocks the DC component of the loop current. The ground
symbols in the model represent AC grounds, not actual DC
potentials.
The sense amp output voltage, VSA, as a function of Tip and
Ring voltage and load is calculated using Equation 23.
VSA = –(VT – VR) -Z1---0L--
(EQ. 23)
The transmit amplifier provides the programmable gain
required for impedance synthesis. In addition, the output of
this amplifier interfaces to the CODEC transmit input. The
output voltage is calculated using Equation 24.
VVTX
=
–VSA
8--R--e---S-3--
(EQ. 24)
Once the impedance matching components have been
selected using the design equations, the above equations
provide additional insight as to the expected AC node
voltages for a specific Tip and Ring load.
Transhybrid Balance
The final step in completing the impedance synthesis design
is calculating the necessary gains for transhybrid balance.
The AC feed back loop produces an echo at the VTX output
of the signal injected at VRX. The echo must be cancelled to
maintain voice quality. Most applications will use a summing
amplifier in the CODEC front end as shown below to cancel
the echo signal.
R
R
1:1
TA
HC5518x
VRX
VTX
RS
-IN
RA
RF
RB
RX OUT
-
+
TX IN
+2.4V
CODEC
FIGURE 7. TRANSHYBRID BALANCE INTERFACE
The resistor ratio, RF/RB, provides the final adjustment for
the transmit gain, GTX. The transmit gain is calculated using
Equation 25.
GTX
=
–G24
R-R----BF--
(EQ. 25)
Most applications set RF = RB, hence the device 2-wire to
4-wire equals the transmit gain. Typically RB is greater than
20kΩ to prevent loading of the device transmit output.
The resistor ratio, RF/RA, is determined by the transhybrid
gain of the device, G44. RF is previously defined by the
transmit gain requirement and RA is calculated using
Equation 26.
RA= G--R---4-B--4--
(EQ. 26)
Power Dissipation
The power dissipated by the device during on hook
transmission is strictly a function of the quiescent currents
for each supply voltage during Forward Active operation.
PFAQ=
VBH
×
I
B
H
Q
+
VB
L
×
IB
LQ
+
VCC
×
ICCQ
(EQ. 27)
Off hook power dissipation is increased above the quiescent
power dissipation by the DC load. If the loop length is less
than or equal to RKNEE, the device is providing constant
current, IA, and the power dissipation is calculated using
Equation 28.
PFA(IA) = PFA(Q) + (VBLxIA) – (RLOOPxI2A)
(EQ. 28)
If the loop length is greater than RKNEE , the device is operating
in the constant voltage, resistive feed region. The power
dissipated in this region is calculated using Equation 29.
PFA(IB)= PFA(Q) + (VBLxIB) – (RLOOPxI2B)
(EQ. 29)
Since the current relationships are different for constant
current versus constant voltage, the region of device
operation is critical to valid power dissipation calculations.
38
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet HC55184.PDF ] | |
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