AM79R70SC datasheet(13/20 Pages) AMD

13 / 20 page

SLIC Products

RING-TRIP COMPONENTS

where RLRT = Loop-detection threshold resistance for ring trip and CF = Crest factor of ringing signal (≈ 1.25)

RSLEW, CSLEW

Ring waveform rise time

≈ 0.214 • (RSLEW • CSLEW) ≈ tr.

For a 1.25 crest factor @ 20 Hz, tr

≈ 10 mS.

∴ (RSLEW = 150 kΩ, CSLEW = 0.33 µF.)

CSLEW should be changed if a different crest factor is desired.

RT2

12 k

Ω

1.5

µF

RT1

320

BAT1

Vbat

–

µA320 CF

LRT

150

()

•

()

–

-------------------------------------------------------------------------------------------------------------------------------------

•

LRT

150

()

•

A(TIP)

Battery

Figure 2. Ringing Waveforms

B(RING)

This is the best time for

switching between RINGING

and other states for minimizing

detect switching transients.

Ringing Reference

(Input to RSLEW)

RSN

RDC

RDC2

RDC1

CDC

SLIC

Feed current programmed by RDC1 and RDC2

Figure 3. Feed Programming

AM79R70SC 数据表(PDF) 13 Page - Advanced Micro Devices

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