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PDF 8560GP Data sheet ( Hoja de datos )
| Número de pieza | 8560GP | |
| Descripción | LUCL8560GP | |
| Fabricantes | Agere Systems | |
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www.DataSheeDt4Ua.tcaomSheet
April 2000
L8560 Low-Power SLIC with Ringing
Features
Description
s Full-feature set for central office applications
s Also ideal for ISDN terminal adapters, pair gain,
and cable telephony applications
s Auxiliary input for second battery, and internal
switch to enable its use to save power in short tele-
phone loops
s 5 V only operation or optional ±5 V operation for
reduced power consumption
s Low active power (85 mW typical) and scan power
(61 mW typical) with 5 V only operation
s Low active power (68 mW typical with auxiliary bat-
tery) and scan power (45 mW typical) with ±5 V
operation
s Quiet tip/ring polarity reversal
s Per-line ringing available for short loops
s Reduced overhead and increased current limit dur-
ing ring mode for lower-battery operation or
increased ring loop length
s Supports meter pulse injection
s Distortion-free full duplex from 0 mA dc loop cur-
rent on-hook transmission
s Convenient operating states:
— Forward powerup
— Polarity reversal powerup
— Forward sleep
— Ground start
— Disconnect
s Adjustable supervision functions:
— Off-hook detector with longitudinal rejection
— Ground key detector with longitudinal rejection
— Ring trip detector
s Independent, adjustable dc and ac parameters:
— dc feed resistance (44-pin PLCC version)
— Loop current limit
— Termination impedance
s Thermal protection
The L8560 full-feature, low-power subscriber line
interface circuit (SLIC) is optimized for low power
consumption while providing an extensive set of fea-
tures. This part is ideal for ISDN terminal adapter
applications and short-loop, power-sensitive applica-
tions such as pair gain and cable telephony. This part
is also designed for PBX, DLC, or CO applications.
The SLIC includes an auxiliary battery input and a
battery switch. In short-loop applications, SLICs can
be used in high battery to present a high on-hook
voltage, and then switched to low battery to reduce
off-hook power.
To help minimize the required auxiliary battery volt-
age, the dc feed resistance and overhead voltage are
set at 55 Ω and 6.7 V, respectively. This allows an
undistorted on-hook transmission of a 3.14 dBm sig-
nal into a 900 Ω loop impedance.
The device offers the reverse battery function. Using
the reverse battery, the device can provide a bal-
anced power ring signal to tip and ring. In this
mode of operation, the battery switch is used to
apply a high-voltage battery during ringing and a
lower-voltage battery during the talk and idle states.
Also included in the L8560 is a dc current-limit
switch, which increases the dc current limit during
power ringing. In addition, dc overhead voltage is
reduced during the ring state. With the battery and
current-limit switches, and overhead reduction, the
L8560 can provide sufficient power to ring a true
North American 5 REN load of 1386 Ω + 40 µF.
The device offers ring trip and loop closure supervi-
sion with 0.3 V and 2 mA hysteresis, respectively. It
also includes the ground start state and ring ground
detection. A summing node for meter pulse injection
to 2.2 Vrms is also included. The 44-pin PLCC ver-
sion also has a spare uncommitted op amp, which
may be used for ac gain setting or meter pulse filter-
ing.
1 page  
www.DataShDeeat4tUa.cSomheet
April 2000
Description (continued)
L8560 Low-Power SLIC with Ringing
SEE ENLARGED DETAIL
BATTERY
SWITCH
VBAT1
INTERNAL SWITCH
DECISION
VREG
ENLARGED DETAIL
PT
BATTERY SWITCH
A=4
POWER CONDITIONING
& REFERENCE
–
AX
+
RECTIFIER 2
VTX TXI
0.1 µF
CEXTERNAL
19.2
SPARE
OP AMP
–
+
CF1
CF2
TG
DCOUT
VITR
SN 44-PIN
PLCC
ONLY
XMT
PR A = –4
44-PIN
PLCC DCR
ONLY
dc RESISTANCE
ADJUST
IPROG
CURRENT-LIMIT
ADJUST
LOOP CLOSURE DETECTOR
LCTH
+
–
– RCVN
1
+ RCVP
BATTERY FEED
STATE CONTROL
B0
B1
B2
BR
NSTAT
RTSP
RTSN
ICM
RING TRIP DETECTOR
RING GROUND
DETECTOR
+
–
RGDET
Figure 1. Functional Diagram
12-2569.c (F)
Lucent Technologies Inc.
5
5 Page 
www.DataShDeeat4tUa.cSomheet
April 2000
L8560 Low-Power SLIC with Ringing
Recommended Operating Conditions
Parameter
Ambient Temperature
Loop Closure Threshold-detection Programming Range
dc Loop Current-limit Programming Range
On- and Off-hook 2-wire Signal Level (@ ZLOOP = 200 Ω)
ac Termination Impedance Programming Range
VBAT1
VBAT2
VCC
VEE (L8560C)
dc Feed Resistance Programming Range (excl. RP)
Min
–40
5
5
—
150
–24
–16
4.5
–4.75
55
Typ
—
10
40
—
600
–48
—
5.0
–5.0
55
Max
85
ILIM
50
2.2
1300
–70
VBAT1
5.5
–5.5
760
Unit
°C
mA
mA
Vrms
Ω
V
V
V
V
Ω
Electrical Characteristics
Minimum and maximum values are testing requirements in the temperature range of 25 °C to 85 °C and battery
range of –24 V to –70 V. These minimum and maximum values are guaranteed to –40 °C based on component
simulations and design verification of samples, but devices are not tested to –40 °C in production. The test circuit
shown in Figure 5 is used, unless otherwise noted. Positive currents flow into the device.
Typical values are characteristics of the device design at 25 °C based on engineering evaluations and are not part
of the test requirements. Supply values used for typical characterization are VCC = 5.0 V, VEE = –5.0 V, VBAT1 =
–48 V, VBAT2 = –25.5 V, unless otherwise noted.
Lucent Technologies Inc.
11
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| PDF Descargar | [ Datasheet 8560GP.PDF ] | |
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