Lucent Technologies Inc.
13
Data Sheet
August 1999
People’s Republic of China Applications
L8567 SLIC for
Electrical Characteristics
(continued)
Table 5. 2-Wire Port
1. This parameter is not tested in production. It is guaranteed by design and device characterization.
2. The longitudinal current is independent of dc loop current.
3. Current-limit I
LIM
is programmed by a resistor, R
PROG
, from pin I
PROG
to AGND. R
PROG
(k
) = 1.59 I
LIM
(mA).
4. IEEE s a registered trademark of The Institute of Electrical and Electronics Engineers, Inc.
5. Longitudinal balance of circuit card will depend on loop series resistance matching.
Table 6. Analog Pin Characteristics
Parameter
Min
65
10
Typ
—
—
Max
—
—
Unit
mA
mArms
Tip or Ring Drive Current = dc + Longitudinal + Signal Currents
Signal Current
1
Longitudinal Current Capability per Wire
1, 2
dc Loop Current Limit
3
:
R
LOOP
= 100
Programmability Range
Accuracy (18 mA < I
LIM
< 45 mA)
Powerup Open-loop Voltage Levels:
Common-mode Voltage
Differential Voltage
Disconnect State:
PT Resistance (V
BAT
< V
PT
< 0 V)
PR Resistance (V
BAT
< V
PR
< 0 V)
dc Feed Resistance (for I
LOOP
below current limit)
Loop Resistance Range (3.17 dBm overload into
200 + 680
||
0.1 μF):
I
LOOP
= 18 mA at V
BAT
= –48 V
Longitudinal to Metallic Balance—IEEE
4
Std. 455
(See Figure 9.)
5
:
50 Hz to 300 Hz
300 Hz to 600 Hz
600 Hz to 3400 Hz
Metallic to Longitudinal Balance:
1 kHz to 3 kHz
8.5
15
—
mArms
—
15
—
I
LIM
—
—
—
45
±
15
mA
mA
%
—
|V
BAT
+ 7.8|
V
BAT
/2
|V
BAT
+ 7.1|
—
|V
BAT
+ 6.4|
V
V
—
—
—
1
1
—
—
—
M
M
110
1800
—
—
38
48
52
—
—
—
—
—
—
dB
dB
dB
38
—
—
dB
Parameter
Min
Typ
Max
Unit
Differential PT/PR Current Sense (DC
OUT
)
Gain (PT/PR to DC
OUT
):
Forward Battery
Reverse Battery
Loop Closure Detector Threshold (on-hook to off-hook at V
BAT1
= – 48 V)
Loop Closure Detector Hysteresis:
Variation
Ring Trip Comparator:
Input Offset Voltage
RCVN, RCVP:
Input Impedance
Gain RCVP to PT/PR
Gain RCVN to PT/PR
—
—
9
—
—
–119
119
11
2
±0.5
—
—
13
—
—
V/A
V/A
mA
mA
mA
—
±10
—
mV
—
—
—
100
2
–2
—
—
—
k
—
—