Lucent Technologies Inc.
13
Data Sheet
April 2000
L8560 Low-Power SLIC with Ringing
Electrical Characteristics
(continued)
Table 6. 2-Wire Port
1. The longitudinal current is independent of dc loop current.
2. Current-limit I
LIM
is programmed by a resistor, R
PROG
, from pin I
PROG
to DCOUT. I
LIM
is specified at the loop resistance where current limiting
begins (see Figure 22). Select R
PROG
(k
) = 0.616 x I
LIM
(mA)
– onset of current limit with input BR high. When input BR is low, the current
will be increased by a factor of 2.8.
3. This parameter is not tested in production. It is guaranteed by design and device characterization.
4. Specification is reduced to |V
BAT1
+ 10.5 V| minimum when V
BAT1
= –70 V at 85
°
C.
5.
IEEE
is a registered trademark of The Institute of Electrical and Electronics Engineers, Inc.
6. Longitudinal balance of circuit card will depend on loop series protection resistor matching and magnitude.
7. Tested at 1000 Hz only. Full frequency specifications guaranteed by design and device characterization.
Parameter
Min
65
15
8.5
Typ
—
—
15
Max
—
—
—
Unit
mA
mArms
mArms
Tip or Ring Drive Current = dc + Longitudinal + Signal Currents
Signal Current
Longitudinal Current Capability per Wire
1
dc Loop Current Limit
2
:
Programmability Range
3
Accuracy (B0 = BR = 5 V, R
LOOP
= 100
,
V
BAT1
= –48 V
or V
BAT2
= –25.5 V active)
Powerup Open Loop Voltage Levels:
Differential Voltage – V
BAT2
(V
BAT2
= –25.5 V)
Differential Voltage – V
BAT1
(V
BAT1
= –48 V)
4
Differential Voltage – V
BAT1
(ring mode)
Ground Start State:
PT Resistance
dc Feed Resistance (for I
LOOP
below current limit)
Loop Resistance Range (3.17 dBm overload into 600
; not in-
cluding protection):
I
LOOP
= 20 mA at V
BAT1
= –48 V
I
LOOP
= 20 mA at V
BAT2
= –24 V
Longitudinal to Metallic Balance—
IEEE
5
Std. 455 (See Figure
8.)
6, 7
:
L8560A/C:
200 Hz to 2999 Hz Forward/Reverse Battery
3000 Hz to 3400 Hz Forward/Reverse Battery
L8560D/E:
200 Hz to 2999 Hz Forward Battery
3000 Hz to 3400 Hz Forward Battery
200 Hz to 2999 Hz Reverse Battery
3000 Hz to 3400 Hz Reverse Battery
L8560F/G:
200 Hz to 2999 Hz Forward/Reverse Battery
3000 Hz to 3400 Hz Forward/Reverse Battery
Metallic to Longitudinal Balance:
200 Hz to 4 kHz
RFI Rejection (See Figure 9.)
3
:
0.5 Vrms, 50
Source, 30% AM Mod. 1 kHz
500 kHz to 100 MHz
5
—
—
—
50
±5
mA
%
|V
BAT2
+ 6.9|
|V
BAT1
+ 7.1|
|V
BAT1
+ 5.5|
|V
BAT2
+ 6.5|
|V
BAT1
+ 6.7|
|V
BAT1
+ 2.4|
|V
BAT2
+ 6.1|
|V
BAT1
+ 6.3|
—
V
V
V
100
—
—
55
—
80
k
1940
760
—
—
—
—
54
49
63
58
58
54
50
45
59
54
68
63
63
59
55
50
—
—
—
—
—
—
—
—
dB
dB
dB
dB
dB
dB
dB
dB
46
—
—
dB
—
–55
–45
dBV