ATTL7554AP View Datasheet(PDF) - Agere -> LSI Corporation

Part Name

Description

Manufacturer

ATTL7554AP

L7554 Low-Power SLIC

Agere -> LSI Corporation 

L7554 Low-Power SLIC

Data Sheet

March 1997

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

RLOOP = 100 Ω

Programmability Range

Accuracy (20 mA < ILIM < 40 mA)

Powerup Open Loop Voltage Levels

Common-mode Voltage

Differential Voltage:

VBAT = –48 V, Temperature = 25 °C

VBAT = –72 V, Temperature = 85 °C (L7554BP)

Disconnect State

PT Resistance (VBAT < VPT < 0 V)

PR Resistance (VBAT < VPR < 0 V)

Ground Start State

PT Resistance

dc Feed Resistance (for ILOOP below regulation level)

Loop Resistance Range (–3.17 dBm overload into

600 Ω; not including protection)

ILOOP = 20 mA at VBAT = –48 V

ILOOP = 20 mA at VBAT = –24 V

Longitudinal to Metallic Balance—IEEE 3 Std. 455

(See Figure 7.)4

50 Hz to 1 kHz

1 kHz to 3 kHz

Metallic to Longitudinal Balance

200 Hz to 4 kHz

RFI Rejection (See Figure 8.)5

0.5 Vrms, 50 Ω Source, 30% AM Mod. 1 kHz

500 kHz to 100 MHz

Min

Typ

Max

Unit

65

—

15

—

8.5

15

—

mA

—

mArms

—

mArms

—

ILIM

—

mA

5

—

45

mA

—

—

±12

%

—

VBAT/2

—

V

|VBAT + 7.0| |VBAT + 6.5| |VBAT + 6.0|

V

|VBAT + 10.0| |VBAT + 6.8|

—

V

100

143

100

133

—

kΩ

—

kΩ

100

143

—

kΩ

90

113

133

Ω

1900

—

700

—

—

Ω

—

Ω

64

75

—

dB

60

70

—

dB

46

—

—

dB

—

–55

–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 25). Select RPROG (kΩ) = 1.67 x ILIM (mA).

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

4. Longitudinal balance of circuit card will depend on loop series resistance matching (see Figures 23 and 24).

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

8

Lucent Technologies Inc.

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