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參數(shù)資料
| 型號： | L7556 |
| 英文描述： | Low-Power SLICs with Battery Switch |
| 中文描述： | 低功耗SLIC組件的電池開關(guān) |
| 文件頁數(shù)： | 8/28頁 |
| 文件大小： | 700K |
| 代理商： | L7556 |
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8
Lucent Technologies Inc.
Data Sheet
January 2000
with Battery Switch
L7556, L7557 Low-Power SLICs
Electrical Characteristics
(continued)
Table 5. 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 19). Select R
PROG
(k
) =1.67 x I
LIM
(mA).
3. IEEE is a registered trademark of The Institute of Electrical and Electronics Engineers, Inc.
4. Longitudinal balance of circuit card will depend on loop series resistance matching (see Figure 23 and Figure 24).
5. This parameter is not tested in production. It is guaranteed by design and device characterization.
Parameter
Min
Typ
Max
Unit
Tip or Ring Drive Current:
= dc + Longitudinal + Signal Currents
Signal Current
Longitudinal Current Capability per Wire
1
dc Loop Current Limit
2
:
R
LOOP
= 100
Programmability Range
Accuracy (20 mA < I
LIM
< 40 mA)
Powerup Open Loop Voltage Levels (includes external diode):
Differential Voltage
Disconnect State:
PT Resistance (V
BAT
< V
PT
< 0 V)
PR Resistance (V
BAT
< V
PR
< 0 V)
Ground Start State:
PT Resistance
dc Feed Resistance (for I
LOOP
below regulation level)
Loop Resistance Range (–3.17 dBm overload into 600
; not
including protection):
I
LOOP
= 20 mA at V
BAT2
= –48 V
I
LOOP
= 20 mA at V
BAT2
= –24 V
Longitudinal to Metallic Balance—
IEEE
3
Std. 455 (See
Figure 6.)
4
:
50 Hz to 1 kHz
1 kHz to 3 kHz
Metallic to Longitudinal Balance:
200 Hz to 4 kHz
RFI Rejection (See Figure 7.)
5
:
0.5 Vrms, 50
Source, 30% AM Mod 1 kHz
500 kHz to 100 MHz
65
15
8.5
—
—
15
—
—
—
mA
mArms
mArms
—
5
—
I
LIM
—
—
—
45
±12
mA
mA
%
|V
BAT
+ 8.4|
|V
BAT
+ 7.9|
|V
BAT
+ 7.4|
V
100
100
143
133
—
—
k
k
100
95
143
115
—
135
k
1885
685
—
—
—
—
64
60
75
70
—
—
dB
dB
46
—
—
dB
—
–55
–45
dBV
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