L9217A データシートの表示（PDF） - Agere -> LSI Corporation

部品番号

コンポーネント説明

メーカー

L9217A

Low-Cost Line Interface with Reverse Battery and PPM

Agere -> LSI Corporation 

Data Sheet

November 2001

L9217A/G Low-Cost Line Interface

with Reverse Battery and PPM

Electrical Characteristics (continued)

Table 5. 2-Wire Port

Parameter

Tip or Ring Drive Current = dc + Longitudinal + Signal

Currents

Signal Current

Longitudinal Current Capability per Wire1

dc Loop Current Limit2:

Allowed Range Including Tolerance3

Accuracy (RLOOP = 100 Ω, VBAT = –48 V)

Powerup Open Loop Voltage Levels (PPMOFF):

Common-mode Voltage

Differential Voltage VBAT = –48 V4 (Gain = 2)

Differential Voltage VBAT = –48 V4 (Gain = 7.86)

Powerup Open Loop Voltage Levels (PPMON)

Minimum Programmed Overhead:

Differential Voltage VBAT = –48 V (Gain = 7.86)

Disconnect State:

Leakage

dc Feed Resistance (for ILOOP below regulation level)

(does not include protection resistor)

Loop Resistance Range (–3.17 dBm overload into

900 Ω; not including protection):

ILOOP = 20 mA at VBAT = –48 V

Longitudinal to Metallic Balance—IEEE ® Std. 455

(See Figure 7.)5:

200 Hz to 3400 Hz

Metallic to Longitudinal Balance (open loop):

200 Hz to 4 kHz

RFI Rejection (See Figure 8.)3, 0.5 Vrms, 50 Ω Source,

30% AM Mod 1 kHz:

500 kHz to 100 MHz

Min

Typ

Max

Unit

80

—

—

mA

15

—

—

mArms

8.5

15

—

mArms

15

—

45

mA

—

±5

—

%

—

VBAT/2

—

V

|VBAT + 7.5| |VBAT + 6.5| |VBAT + 5.9|

V

|VBAT + 8.0| |VBAT + 6.5| |VBAT + 5.9|

V

—

—

|VBAT + 18.67| V

—

10

150

µA

—

72

100

Ω

1800

—

58

61

40

—

—

—

—

–55

—

Ω

—

dB

—

dB

—

—

–45

dBV

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

2. Current-limit ILIM is programmed by a resistor, RPROG, from pin IPROG to DCOUT. ILIM is specified at the loop resistance where current limiting

begins (see Figure 13).

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

4. Specification is reduced to |VBAT1 + 10.5 V| minimum when VBAT1 = –70 V at 85 °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.

Agere Systems Inc.

9

Share Link: