參數(shù)資料
型號(hào)： LUCL7585GBE-D
英文描述： Full-Feature,Low-Power SLIC and Switch
中文描述： 全功能，低功耗SLIC和開(kāi)關(guān)
文件頁(yè)數(shù)： 11/22頁(yè)
文件大?。?/td> 446K
代理商： LUCL7585GBE-D
Agere Communications Inc.
11
Data Sheet
September 2001
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 cur-
rent 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. 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
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
9
48
70
66
—
—
dB
dB
—
35
—
—
dB
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