AG1170 데이터 시트보기 (PDF) - Unspecified

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AG1170

+5V / +3.3V Low Power Ringing SLIC

Unspecified 

V1.9 September 2006

Data Sheet

Ag1170

+5V / +3.3V LOW POWER RINGING SLIC

R2

+5V/+3.3V

+ C4

TIP

RING

+ C2

C1

C3

D2

D3

D4

D5

To other

circuits

D1

+V PW R

GNDPWR

+VA

GNDPWR/

GNDA

Ag1170 F/R

SHK

TIP

RM

Silver

TEL EC O M

RING

V OUT

C5

V IN

PD

C6

To Micro

Controller

To Codec

R1

High input for Power Down.

T1

Low Input for free run

Components

C1, C3, C5, C6 = 100nF

C2 = 220uF, 10V, Rubycon ZL (or equivalent low ESR)

C4 = 100uF, 6.3V

R2 = 10R

D1 = BZT03C82 or P6KE82 (only one needed per line card)

D2 – 5 = 1N4004 or MB4S bridge

R1 = 10K

T1 = BC846

Figure 5: Typical Connection Diagram

4.0 Switch Hook Detect Level

When the subscriber goes “off-hook” loop current will

begin to flow. If this current is above the detection

threshold (10mA) the switch hook output, SHK, will

switch to a logic 1. It is recommended that software or

hardware de-bouncing of the switch hook signal is

used. This is to avoid short pulses which can cause a

false switch hook output, triggering the incorrect

system response.

During loop disconnect dialling, SHK will pulse

between logic 1 and logic 0 to indicate the digits being

dialled. Again it is recommended that software de-

bouncing is used to avoid false detection of digits.

5.0 Protection of the Ag1170 SLIC

5.1 Thermal Protection

Should the SLIC be operated incorrectly, for example

by accidentally shorting Tip and Ring to each other or

to ground, the power dissipation is automatically limited

by the DC/DC converter

This feature means that the SLIC will always operate

within its power limits, without overheating. When

operating on very short lines the battery voltage is

regulated to a low value. This limits the power

dissipation and ensures the Ag1170 operates with a

minimum temperature rise.

© Silver Telecom 2006

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