參數(shù)資料
型號(hào)： L8574D
英文描述： CAP 15PF 50V 5% C0G SMD-0402 TR-7-PA SN100
中文描述： L8574D電阻用戶線接口電路（SLIC），環(huán)繼電器和保護(hù)（SRP）的為遠(yuǎn)距離和TR - 57應(yīng)用
文件頁(yè)數(shù)： 8/36頁(yè)
文件大?。?/td> 489K
代理商： L8574D
8
Lucent Technologies Inc.
Data Sheet
October 1998
Relay, and Protector (SRP) for Long Loop and TR-57 Applications
L8574D Resistive Subscriber Line Interface Circuit (SLIC), Ring
Electrical Characteristics
(continued)
Ring Trip Detector
Table 3. Ring Trip Detector
1. The ringing source consists of the ac and dc voltages added together (battery-backed ringing); the ringing return is battery ground.
2. Pretrip: ringing must not be tripped by a 10 k
resistor in parallel with an 8
μ
F capacitor applied across Tip and Ring.
Battery Feed
Table 4. Battery Feed
1. Assumes 2 x 200
external dc feed resistors.
2. When the current-limit circuit is active and the battery switch is off, the longitudinal current must be less than the dc loop current to ensure
proper ac transmission.
3. Assumes C
LIM
= 33 nF; C
LIM
determines the ac output impedance of the current-limit circuit when it is active.
4. Detector values are independent of office battery and are valid over the entire range of V
BAT1
and V
BAT2
. However, NSTAT must indicate an
on-hook (NSTAT = 1) if either V
BAT1
or V
BAT2
is disconnected (open circuit) from its dc source and an off-hook (NSTAT = 0) if the L8574 is in
thermal shutdown. The status of the thermal shutdown circuit is output on B3 when CS is high (thermal shutdown is a logic 0). V
BAT1
and
V
BAT2
are defined as disconnected depending on the voltage at the power supply pins as follows (the pins of supplies that have more than
one pin are shorted together):
— If V
BAT1
≤
–20 V (i.e., more negative than –20 V) and V
BAT2
≤
–20 V, then NSTAT must operate normally.
— If V
BAT1
≥
–10 V (i.e., more positive than –10 V) or V
BAT2
≥
–10 V, then NSTAT must be on-hook (NSTAT = 1).
5. IEEEis a registered trademark of The Institute of Electrical and Electronics Engineers, Inc.
6. Assumes the external dc feed resistors are matched to 0.2% and proper battery noise cancellation; i.e., a 0.22
μ
F capacitor from V
BF
to CBN
(see Figure 5).
7. Assumes proper battery noise cancellation; i.e., a 0.22
μ
F capacitor from V
BF
to CBN (see Figure 5).
Parameter
Min
Typ
Max
Unit
Ringing Source
1
:
Frequency (f)
dc Voltage
ac Voltage
Ring Trip
2
(NSTAT = 0):
Loop Resistance
Trip Time (f = 20 Hz)
NSTAT Valid
17
–36
60
20
—
—
28
–57
105
Hz
V
Vrms
1840
—
—
—
—
—
—
200
80
ms
ms
Parameter
Min
Typ
Max
Unit
Loop Resistance Range
1
(3.17 dBm overload into 600
):
I
LOOP
= 18 mA at V
BAT2
= –42 V
Longitudinal Current Capability per Wire
2
dc Loop Current Limit (R
LOOP
= 200
)
Current-limiter ac Output Impedance
3
:
200 Hz to 4 kHz
Current-limiter Transient Current (in response to a step voltage
change on V
BF
)
Switchhook Detector Loop Resistance
4
:
Off-hook (NSTAT = 0)
On-hook (NSTAT = 1)
Longitudinal to Metallic Balance—IEEE
5
Std. 455
6
:
200 Hz to 1 kHz
1 kHz to 3 kHz
Metallic to Longitudinal (Harm) Balance
7
:
200 Hz to 4 kHz
1840
8.5
26.5
—
—
28
—
—
29.5
mArms
mA
—
8
—
—
25
150
mA
—
—
4400
3300
—
—
—
2700
—
58
53
—
—
—
—
dB
dB
30
—
—
dB
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