L8576B 데이터 시트보기 (PDF) - Agere -> LSI Corporation

부품명

상세내역

제조사

L8576B

Dual Ringing SLIC

Agere -> LSI Corporation 

Data Sheet

May 2001

L8576B Dual Ringing SLIC

Electrical Characteristics (continued)

Pretrip will not occur for the circuits shown below, per GR-909, 4.5.9.

200 Ω

TIP

SWITCH CLOSES FOR LESS THAN 12 ms

6 µF

TIP

10 kΩ

RING

RING

Figure 4. Pretrip Circuit

12-2572(F).d

Table 5. Battery Feed

Parameter

Min

Typ

Loop Resistance Range1

(3.17 dBm overload into 600 Ω):

ILOOP = 20 mA at VBAT = –65 V

Longitudinal Current Capability per Wire2

1000

—

8.5

15

Current Limit3 RLOOP = 100 Ω:

dc Loop

Instantaneous 4

20

24

50

60

Tip or Ring Drive Current = dc + Longitudinal + Signal Currents

65

—

Signal Current

5

—

Powerup Open Loop Voltage Level

Differential Voltage (RNGNG = 0, NDISC = 1, B2 = 1,

VBAT = –65 V)

|VBAT + 10|

—

Disconnect State:

PT or PR Current (VBAT < VPT < 0 V)

PT or PR Resistance (VBAT < VPT < 0 V)

–1

—

100

—

dc Feed Resistance

—

60

Longitudinal to Metallic Balance—IEEE 5 Standard 4556:

200 Hz to 1 kHz

1 kHz to 3 kHz

Metallic to Longitudinal (Harm) Balance7:

200 Hz to 4 kHz

54

67

48

62

35

—

Max

Unit

—

Ω

—

mArms

28

mA

70

mA

—

mA

—

mArms

—

V

1

mA

—

kΩ

70

Ω

—

dB

—

dB

—

dB

1. Assumes 2 x 30 Ω external protection resistors. Note the useful range of the device may be determined by the ringing or supervision range

rather than the ac characteristics.

2. The longitudinal current is independent of dc loop current.

3. Current limit ILIM is programmed by a resistor, RPROG, from pin IPROG to pin DCOUT RPROG (kΩ) = 3.5 x (ILIM – 9.2) mA. The current limit has a

slope vs. loop voltage of 6 kΩ. To control power dissipation, it is recommended that the default current limits be utilized, i.e., RPROG = 51.1 kΩ

for 24 mA nominal loop current limit.

4. Instantaneous current limit minimizes inrush current at the onset of an off-hook condition. Inrush current is only limited when in the forward

battery state. The device will settle into a dc loop current-limit value within 400 ms after off-hook.

5. IEEE is a registered trademark of The Institute of Electrical and Electronics Engineers, Inc.

6. Assumes the external protection resistors are matched to 1%.

7. This parameter is not tested during production. It is guaranteed by design and device characterization.

Agere Systems Inc.

11

Share Link: