L8567 datasheet(13/42 Pages) AGERE

13 / 42 page

Lucent Technologies Inc.

Data Sheet

August 1999

People’s Republic of China Applications

L8567 SLIC for

Electrical Characteristics (continued)

Table 5. 2-Wire Port

1. This parameter is not tested in production. It is guaranteed by design and device characterization.

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

3. Current-limit ILIM is programmed by a resistor, RPROG, from pin IPROG to AGND. RPROG (k

Ω) = 1.59 ILIM (mA).

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

5. Longitudinal balance of circuit card will depend on loop series resistance matching.

Table 6. Analog Pin Characteristics

Parameter

Min

Typ

Max

Unit

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

—

Signal Current1

—

mArms

Longitudinal Current Capability per Wire1, 2

8.5

—

mArms

dc Loop Current Limit3:

RLOOP = 100

Ω

Programmability Range

Accuracy (18 mA < ILIM < 45 mA)

—

ILIM

—

±15

Powerup Open-loop Voltage Levels:

Common-mode Voltage

Differential Voltage

—

|VBAT + 7.8|

VBAT/2

|VBAT + 7.1|

—

|VBAT + 6.4|

Disconnect State:

PT Resistance (VBAT < VPT < 0 V)

PR Resistance (VBAT < VPR < 0 V)

—

Ω

dc Feed Resistance (for ILOOP below current limit)

—

110

—

Ω

Loop Resistance Range (3.17 dBm overload into

200 + 680

|| 0.1 µF):

ILOOP = 18 mA at VBAT = –48 V

1800

—

Ω

Longitudinal to Metallic Balance—

IEEE4 Std. 455

(See Figure 9.)5:

50 Hz to 300 Hz

300 Hz to 600 Hz

600 Hz to 3400 Hz

—

Metallic to Longitudinal Balance:

1 kHz to 3 kHz

—

Parameter

Min

Typ

Max

Unit

Differential PT/PR Current Sense (DCOUT)

Gain (PT/PR to DCOUT):

Forward Battery

Reverse Battery

—

–119

119

—

V/A

Loop Closure Detector Threshold (on-hook to off-hook at VBAT1 = – 48 V)

Loop Closure Detector Hysteresis:

Variation

—

±0.5

—

Ring Trip Comparator:

Input Offset Voltage

—

±10

—

RCVN, RCVP:

Input Impedance

Gain RCVP to PT/PR

Gain RCVN to PT/PR

—

100

–2

—

Ω

—

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