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參數(shù)資料
| 型號(hào)： | L7585G |
| 廠商： | Lineage Power |
| 英文描述： | Full-Feature, Low-Power SLIC and Switch(特點(diǎn)齊全的低功耗用戶接口和開(kāi)關(guān)) |
| 中文描述： | 全功能，低功耗SLIC和開(kāi)關(guān)（特點(diǎn)齊全的低功耗用戶接口和開(kāi)關(guān)） |
| 文件頁(yè)數(shù)： | 11/22頁(yè) |
| 文件大?。?/td> | 560K |
| 代理商： | L7585G |
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Lucent Technologies Inc.
11
Data Sheet
May 2000
L7585G Full-Feature, Low-Power SLIC and Switch
Electrical Characteristics
(continued)
Table 6. Battery Feed Characteristics
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 pin DC
OUT
. R
PROG
= 1.667 x (I
LIM
– 4); R
PROG
in k
and I
LIM
in mA. The current limit versus loop voltage has a slope of 10 k
. The low-current mode current limit is approximately 0.66 times the high
current limit. The ground start ring lead ground current limit is approximately equal to the high current limit and has a slope of about 5 k
.
3. In transmission applications, for compliance with TR-57, ground start ring lead I-V characteristics at high battery, it is expected that the
high-current active current limit will be set to 28 mA.
4. Loop closure detector current, I
LCD
, is programmed by a resistor, RLCTH, from pin LCTH to pin DC
OUT
. RLCTH = 2.5 x I
LCD
; RLCTH in
k
and I
LCD
in mA. I
LCD
is the tip to ring (forward battery) or ring to tip (reverse battery) current at which the loop closure detector indi-
cates an off-hook.
5. dc feed resistance may be adjusted between 180
and 600
using a resistor divider between DC
OUT
and DCR. The open loop differen-
tial voltage may also be increased by applying a negative voltage to pin DCR. See dc Gains, pin DCR.
6. DC
OUT
gain depends on the resistor RGX1 from pin VITR to pin ITR. This gain assumes 8250
, the recommended value. Positive current
is defined as the differential current flowing from PT to PR.
7. Positive voltage on pin DCR has no effect on the PT/PR voltage.
8. At tip and ring, assuming 82.5
protection resistors.
9.
IEEE
is a registered trademark of The Institute of Electrical and Electronics Engineers, Inc.
10. At tip and ring with matched 82.5
protection resistors when feedback is connected for either 600
or 900
termination impedance.
Parameter
Symbol
—
Min
65
Typ
—
Max
—
Unit
mA
Tip or Ring Drive Current =
dc + Longitudinal + Signal Currents
ac Signal Current
Longitudinal Current Capability per Wire
1
dc Loop Current Limit
2
(R
LOOP
= 100
):
Programmability Range
Current Limit with V
BAT
= –51.5 V
and R
PROG
= 64.9 k
Low-current Mode
2
(R
LOOP
= 100
,
V
BAT
= –51.5 V, and R
PROG
= 64.9 k
)
Ground Start Ring Grounded (R
LOOP
= 100
)
Current Limit
3
:
V
BAT
= –51.5 V, R
PROG
= 64.9 k
Loop Closure Current Detector Threshold
4
Programming Accuracy
Open Loop Voltages (DCR = 0 V):
Common-mode Voltage
Differential Voltage
Disconnect State PT/PR Voltage
Ground Start Ring Lead Open or Shorted to Ground:
PT and CF1 Voltage
dc Feed Resistance:
DCR Grounded
DCR Connected to DC
OUT
5
dc Gains:
PT/PR Current to DC
OUT
Voltage
6
:
Forward Battery
Reverse Battery
DCR Voltage
7
to PT/PR Differential Voltage
Loop Resistance Range
8
(3.17 dBm overload into 600
):
I
LOOP
= 20 mA at V
BAT
= –51.5 V
Longitudinal to Metallic Balance—
IEEE
9
Std. 455:
50 Hz to 1 kHz
1 kHz to 3 kHz
Metallic to Longitudinal (harm) Balance:
200 Hz to 4 kHz
—
—
10
8.5
—
15
—
—
mArms
mArms
I
LIM
5
44
—
42
45
56
mA
mA
25
27.5
30
mA
38
—
43
—
47
±7
mA
%
I
LCD
—
—
|V
BAT
+ 7.0|
—
(V
BAT
+ 1.8)/2
|V
BAT
+ 6.5|
—
—
|V
BAT
+ 6.0|
±100
V
V
|PT-PR|
—
mV
–1.7
–2.0
–2.3
V
—
130
480
150
505
170
630
—
–118
118
3.13
—
—
3.33
–132
132
3.53
V/A
V/A
—
—
1890
1930
—
—
58
10
48
70
66
—
—
dB
dB
—
35
—
—
dB
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