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PDF LE79M576A Data sheet ( Hoja de datos )
| Número de pieza | LE79M576A | |
| Descripción | Metering Subscriber Line Interface Circuit | |
| Fabricantes | Legerity | |
| Logotipo |  |
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Le79M576A
Metering Subscriber Line Interface Circuit
DISTINCTIVE CHARACTERISTICS
I Programmable constant-resistance feed
I Programmable loop-detect threshold
I Ground-key detect
I Performs polarity reversal
I Ring relay driver
I Supports 2.2 Vrms metering (12 and 16 kHz)
I Line feed characteristics independent of battery
variations
I On-chip switching regulator for low-power
dissipation
I Two-wire impedance set by single external
impedance
I Tip Open state for ground-start lines
I On-hook transmission
BLOCK DIAGRAM
A(TIP)
HPA
HPB
Two-Wire
Interface
B(RING)
DA
DB
VREG
L
VBAT
BGND
Ground-Key
Detector
Ring Relay
Driver
Input Decoder
and Control
Signal
Transmission
Off-Hook Detector
Power-Feed
Controller
Ring-Trip
Detector
Switching
Regulator
VCCRING
RINGOUT/DGND
C1
C2
C3
E0
E1
DET
VTX
RSN
RD
RDC
CHS QBAT CHCLK VCC VEE AGND/DGND
Document ID# 080140 Date: Jun 19, 2002
Rev:
E Version: 1
Distribution: Public Document
1 page  
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ABSOLUTE MAXIMUM RATINGS
Storage temperature ........................ –55° C to +150° C
Ambient temperature, operating .......... –0° C to +70° C
VCC with respect to AGND ................. –0.4 V to +7.0 V
VEE with respect to AGND ................. +0.4 V to –7.0 V
VBAT with respect to AGND ................ +0.4 V to –70 V
Note: Rise time of VBAT (dv/dt) must be limited to 27 V/µs or
less when QBAT bypass is 0.33 µF.
BGND with respect to AGND/DGND.. +1.0 V to –3.0 V
A(TIP) or B(RING) to BGND:
Continuous ......................................... –70 V to +2 V
10 ms (f = 0.1 Hz) ............................... –70 V to +5 V
1 µs (f = 0.1 Hz) ................................ –90 V to +10 V
250 ns (f = 0.1 Hz) .......................... –120 V to +15 V
Current from A(TIP) or B(RING)..................... ±150 mA
Voltage on VCCRING ........................... –0.3 V to +7 V
Current through relay drivers or
internal driver catch diodes ..............................60 mA
Voltage on ring-trip inputs DA and DB .......VBAT to 0 V
Current into ring-trip inputs .............................. ±10 mA
Peak current into regulator switch (L pin) ........150 mA
Switcher transient peak off voltage on L pin ......+1.0 V
C3–C1, E0, E1, CHCLK
to AGND...................................–0.4 V to VCC + 0.4 V
Maximum power dissipation (see note) ...... TA = 70° C
In 32-pin PLCC package..................................1.2 W
Note: Thermal limiting circuitry on-chip will shut down the
circuit at a junction temperature of about 165°C. The de-
vice should never be exposed to this temperature. Opera-
tion above 145°C junction temperature may degrade
device reliability. See the SLIC Packaging Considerations
for more information.
Stresses above those listed under Absolute Maximum Ratings
may cause permanent device failure. Functionality at or above
these limits is not implied. Exposure to Absolute Maximum
Ratings for extended periods may affect device reliability.
OPERATING RANGES
Commercial (C) Devices
Ambient temperature ............................ 0° C to +70° C*
VCC ..................................................... 4.75 V to 5.25 V
VEE ................................................. –4.75 V to –5.25 V
VBAT .................................................. –46.4 V to –54 V
VCCRING ................................................. 0 V to 5.25 V
AGND/DGND.......................................................... 0 V
BGND with respect to AGND.................... –2 V to +2 V
Load resistance on VTX to ground ............... 10 kΩ min
Operating Ranges define those limits between which device
functionality is guaranteed.
* Legerity guarantees the performance of this device over
commercial (0 to 70°C) and industrial (-40 to 85 °C)
temperature ranges by conducting electrical characterization
over each range and by conducting a production test with
single insertion coupled to periodic sampling. These
characterization and test procedures comply with section
4.6.2 of Bellcore TR-TSY-000357 Component Reliability
Assurance Requirements for Telecommunications
Equipment.
Le79M576A Data Sheet
5
5 Page 
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11. Total Harmonic distortion with metering is specified with a metering signal of 2.2 Vrms at the two-wire output, and a transmit
signal of +3 dBm or receive signal of –4 dBm. The transmit or receive signals are single-frequency inputs, and the distortion
is measured as the highest in band harmonic at the two-wire or the four-wire output relative to the input signal.
12. Noise with metering is measured by applying a 2.2 Vrms metering signal (measured at the two-wire output) and measuring
the psophometric noise at the two-wire outputs over a 200 ms time interval.
Table 1. SLIC Decoding
State
0
C3 C2 C1
000
Two-Wire Status
Open Circuit
DET Output
E0 = 1*
E1 = 0
E0 = 1*
E1 = 1
Ring trip
Ring trip
1
001
Ringing
Ring trip
Ring trip
2
010
Active
Loop detector
Ground key
3
011
On-hook TX (OHT)
Loop detector
Ground key
4
100
Tip Open
Loop detector
—
5
101
Reserved
Loop detector
—
6
110
Active Polarity Reversal
Loop detector
Ground key
7
111
OHT Polarity Reversal
Loop detector
Note:
* A logic Low on E0 disables DET output into the Open Collector state.
Ground key
Table 2. User-Programmable Components
ZT = 510(Z2WIN – 2RF )
ZRX = 0.98(ZT)
RDC1 + RDC2 = 50 • (RFEED – 2RF)
CDC
=
1.5 ms • R-----D---C----1----+-----R----D----C---2-
RDC1 • RDC2
ZT is connected between the VTX and RSN pins. The fuse
resistors are RF, and Z2WIN is the desired two-wire AC input
impedance. When computing ZT, the internal current amplifier
pole and any external stray capacitance between VTX and
RSN must be taken into account.
ZRX is connected from VRX to RSN. ZT is defined above. This
equation sets the receive gain to 0 dB when the SLIC
terminates with an impedance equal to Z2WIN.
RDC1, RDC2, and CDC form the network connected to the RDC
pin. RDC1 and RDC2 are approximately equal.
RD
=
3----6---5- ,
IT
CD
=
0----.-5-----m----s-
RD
ZM
=
--V-----M----G---- •
VM2W
--------------------------K----1---(--ω----)--Z----L----•-----Z----T--------------------------
ZT + 0.51 V • K1(ω) • (2RF + ZL)
RD and CD form the network connected from RD to –5 V and IT
is the threshold current between on-hook and off-hook.
ZM is connected from VMG (metering source) to the RSN pin,
VM2W is the desired magnitude of the metering signal at the
2-wire output (usually 2.2 Vrms) and K1 ( ω ) is defined below.
K 1 ( ω)
=
-----------------------------------------------1---0---0---0-----------------------------------------------
1 + jω11.5 • 10–9 + C---2--X--- (36 + ZL + 2RF)
where: CX = The values of the identical capacitors from
A and B to GND
ω = 2π • metering frequency
Le79M576A Data Sheet
11
11 Page | ||
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| PDF Descargar | [ Datasheet LE79M576A.PDF ] | |
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