3

FIGURE 1. OVERLOAD LEVEL (TWO-WIRE PORT)

FIGURE 2. LONGITUDINAL IMPEDANCE

LONGITUDINAL CURRENT LIMIT (TIP/RING)

Off-Hook (Active)

No False Detections, (Loop Current),

LB > 45dB (Note 4, Figure 3A)

27

-

-

Wire

No False Detections (Loop Current)

(Note 5, Figure 3B)

8.5

-

-

Wire

FIGURE 3A. OFF-HOOK

FIGURE 3B. ON-HOOK

FIGURE 3. LONGITUDINAL CURRENT LIMIT

OFF-HOOK LONGITUDINAL BALANCE

Longitudinal to Metallic

0.2kHz < f < 4.0kHz (Note 6, Figure 4)

58

70

-

dB

Longitudinal to Metallic

6, Figure 4)

58

70

-

dB

Metallic to Longitudinal

FCC Part 68, Para 68.310

0.2kHz < f < 1.0kHz

50

55

-

dB

1.0kHz < f < 4.0kHz (Note 7)

50

55

-

dB

Longitudinal to 4-Wire

0.2kHz < f < 4.0kHz (Note 8, Figure 4)

58

70

-

dB

Metallic to Longitudinal

9, Figure 5)

50

55

-

dB

4-Wire to Longitudinal

0.2kHz < f < 4.0kHz (Note 10, Figure 5)

50

55

-

dB

Electrical Specifications

number references in the figures refer to the 28 lead PLCC package. (Continued)

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

TIP

27

19

RING

28

RSN

16

600k

Ω

300k

Ω

600

Ω

23mA

C

0 < f < 100Hz

300

Ω

300

Ω

2.16

µF

TIP

27

19

RING

28

RSN

16

600k

Ω

300k

Ω

41.2k

Ω

41.2k

Ω

1.5

µF

-5V

39k

Ω

368

Ω

368

Ω

C

2.16

µF

A

TIP

27

RSN

16

RING

28

14

DET

A

41.2k

Ω

41.2k

Ω

1.5

µF

-5V

39k

Ω

368

Ω

368

Ω

A

TIP

27

RSN

16

RING

28

14

DET

C

2.16

µF

C

2.16

µF

A

HC5523