L7585F datasheet(19/22 Pages) AGERE

Il numero della parte	L7585F

Spiegazioni elettronici	Full-Feature,Low-Power SLIC and Switch

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Produttore elettronici	AGERE [Agere Systems]

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Agere Communications Inc.

19

Data Sheet

September 2001

L7585F Full-Feature, Low-Power SLIC and Switch

Applications (continued)

Ring Trip

Ring trip is set by the value of RS1.

The ring trip threshold at the ring trip inputs is ±2.5 V

minimum, ±3.5 V maximum.

A resistor value of 500

Ω, as shown in Figure 4, will set

the ring trip current threshold to ±6.0 mA typical.

Ring trip is asserted upon entering the ringing mode

until the second zero crossing of ringing. This is either

a positive-going zero crossing between –40 V and

–30 V at –50 V VBAT) or a negative-going zero crossing

(between –10 V and –20 V at –50 V VBAT). The different

threshold for positive-going and negative-going zero

crossings is the result of hysteresis of approximately

20 V.

Ring trip will not be asserted unless the ring trip thresh-

old is exceeded for two zero crossings. This is either a

positive-going zero crossing between –40 V and –30 V

at –50 V VBAT) or a negative-going zero crossing

(between –10 V and –20 V at –50 V VBAT). The different

threshold for positive-going and negative-going zero

crossings is the result of hysteresis of approximately

20 V.

Note that since the ringing voltage is monitored at

RSW, one zero crossing can occur at switch turn-on

depending on initial conditions.

Ring trip is asserted immediately if the ring trip input is

15 V ± 3 V.

False On-Hook Transients

s

If the L7585F is off-hook in the ground-start/tip open

state, the ground-start/tip ground state, or the

ground-start/tip amplifier state, due to an applied ring

ground, and it is switched to the forward battery

active state, it will not generate a false on-hook

longer than 10 ms in duration. This applies for loop

resistances of 0

Ω to 2000 Ω, providing that all of the

following criteria are satisfied:

— A loop closure is applied before the L7585F

switches to the forward battery active state.

— The loop closure resistance (telephone set) is less

than 430

Ω.

— The ring ground and loop closure are applied at

the same end of the loop.

— If the ring ground is removed while the L7585F is

in the forward battery active state, then the ring

ground resistance must be greater than 225

Ω

when the dc current limit is 40 mA, or greater than

430

Ω when the dc current is 28 mA.

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