Agere Systems Inc.

9

Data Sheet

November 2001

with Reverse Battery and Dual Current Limit

L9219A/G Low-Cost Line Interface

Table 5. 2-Wire Port

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

begins (see Figure 13).

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

°C.

5. Longitudinal balance of circuit card will depend on loop series protection resistor matching and magnitude. More information is available in

the Applications section of this document.

Parameter

Min

Typ

Max

Unit

Tip or Ring Drive Current = dc + Longitudinal + Signal

Currents

80

—

—

mA

Signal Current

15

—

—

mArms

8.5

15

—

mArms

15

—

—

±5

45

—

mA

%

Powerup Open Loop Voltage Levels:

Common-mode Voltage

—

—

V

V

V

Disconnect State:

Leakage

—

10

150

µA

not include protection resistor)

—

70

100

Ω

Loop Resistance Range (–3.17 dBm overload into

900

Ω; not including protection):

1800

—

—

Ω

Longitudinal to Metallic Balance—

200 Hz to 3400 Hz

58

61

—

dB

Metallic to Longitudinal Balance (open loop):

200 Hz to 4 kHz

40

—

—

dB

Ω Source,

30% AM Mod 1 kHz:

500 kHz to 100 MHz

—

—

—

–55

—

–45

—

dBV