AG1170 데이터 시트보기 (PDF) - Unspecified

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AG1170

+5V / +3.3V Low Power Ringing SLIC

Unspecified 

V1.9 September 2006

Data Sheet

Signal

1

INPUT RM

0

1

OUTPUT SHK

0

Ag1170

+5V / +3.3V LOW POWER RINGING SLIC

Condition 1 - DC ope ration

Notes

No ringing

Off Hook

Off hook detected

NO TE: SHK SHOULD

BE DE-BOUNCED FO R

10ms

Condition 2 - Ringing On-hook

Condition 3 - Ringing/Off-hook

1

RM

0

1 sec

3 sec

1 sec

3 sec

1

F/R

(input) 0

1

SHK

0

The phone goes off hook, and SHK is detected at point A

(leading edge). RM must be switched low in <500ms

(point B), and the ringing cadence should be removed

fro m F/R..

AB

As long as the telephone is off hook, SHK will remain high.

Figure 4: Ringing Signal Waveforms

3.3 Network Balance Impedance.

The network balance impedance ZB of the Ag1170 is

set to 600R and it requires no external programming

resistors.

To programme the ZB for the Ag1170P components

are connected from the VIN pin to the ZB pin. For ZB =

ZT use a 100K resistor in series with a 47nF capacitor.

Further details on the programming of the Ag1170P are

contained within Applications Note: AN1170-1.

3.4 Tip & Ring Polarity Reversal.

The Ag1170 can reverse the battery voltage polarity at

Tip and Ring via the F/R pin.

If F/R is held at logic 1 (forward) the d.c. voltage at Tip

is positive with respect to Ring. If F/R is taken to logic

0 the voltage polarity is reversed.

3.5 On Hook Transmission.

The Ag1170 is capable of on-hook transmission. This

means analog signals can be transmitted from VIN

through Tip and Ring and onto the line even when no

loop current is flowing. This can be used when

sending Caller Line Identification (CLI) information or

for other “no ring” calls.

The Ag1170 will provide on hook transmission with a

high impedance on Tip/Ring or with AC loads down to

600R.

© Silver Telecom 2006

7

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