L9214G Просмотр технического описания (PDF) - Agere -> LSI Corporation

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L9214G

Low-Cost Ringing SLIC

Agere -> LSI Corporation 

L9214A/G

Low-Cost Ringing SLIC

Preliminary Data Sheet

October 2001

Features

s Onboard balanced trapezoidal ringing generation,

40 Vrms, 1.2 crest factor:

— 3 REN ring load (2330 Ω + 24 µF), 600 Ω loop

— 2 REN ring load (3500 Ω + 16 µF), 1000 Ω loop

— 2 REN ring load (3500 Ω + 1.8 µF), 500 Ω loop

— No ring relay

— No bulk ring generator required

— 15 Hz to 70 Hz ring frequency supported

s Power supplies requirements:

— VCC talk battery and ringing battery required

— No –5 V supply required

— No high-voltage positive supply required

s Flexible Vcc options:

— 3.3 V or 5 V VCC operation

— 3.3 V or 5 V VCC interchangeable and transparent

to users

s Power control options:

— Automatic battery switch

— Power control resistor

s Minimal external components required

s Ten operating states:

— Forward active, fast polarity reversal

— Reverse active, fast polarity reversal

— Forward active, slow polarity reversal

— Reverse active, slow polarity reversal

— Scan

— Disconnect

— Ringing, line forward with high slope

— Ringing, line reverse with high slope

— Ringing, line forward with low slope

— Ringing, line reverse with low slope

s Unlatched parallel data control interface

s Low SLIC power:

— Scan 24 mW (VCC = 5.0 V)

— Forward/reverse active 148 mW (VCC = 5.0 V)

— Scan 17 mW (VCC = 3.3 V)

— Forward/reverse on-hook 135 mW (VCC = 3.3 V)

s Supervision:

— Loop start, fixed threshold with hysteresis

— Ring trip filtering, fixed threshold not a function of

battery voltage, user adjustable with an external

resistor

— Common-mode current for ground key applica-

tions, user-adjustable threshold

s Adjustable current limit:

— 10 mA to 45 mA programming range at 5 V Vcc

— 10 mA to 35 mA programming range at 3.3 V Vcc

s Overhead voltage:

— Automatically adjusted in active mode

— Clamped <56.5 V in scan and on-hook modes

s Thermal shutdown protection with hysteresis

s Longitudinal balance:

— ETSI/ITU-T balance

— GR-909

s Meter pulse compatible

s ac interface:

— Two SLIC gain options to minimize external com-

ponents required for interface to first- or third-gen-

eration codecs

— Sufficient dynamic range for direct coupling to

codec output

s 28-pin SOG, 32-pin PLCC, and 48-pin MLCC pack-

age options

s 90 V CBIC-S technology

Description

The L9214 is designed to provide battery feed, ringing,

and supervision functions on short and medium plain

old telephone service (POTS) loops. Supported round-

trip loop length is up to 1000 Ω of wiring resistance plus

handset or ringing load. This device is designed to min-

imize power in all operating states.

The L9214 offers eight operating states. The device

assumes use of a lower-voltage talk battery, a higher-

voltage ringing battery and a single VCC supply.

The L9214 requires only a positive VCC supply. No

–5 V supply is needed. The L9214 can operate with a

VCC of either 5.0 V or 3.3 V, allowing for greater user

flexibility. The choice of VCC voltage is transparent to

the user; the device will function with either supply volt-

age connected.

Two batteries may be used:

1. A high-voltage ring battery (VBAT1). VBAT1 is a maxi-

mum –70 V and is used for power ringing, scan, and

on-hook transmission modes. This supply is current

limited to the maximum power ringing current of

approximately 90 mApeak.

2. A lower-voltage talk battery (VBAT2). VBAT2 is nor-

mally used for active mode powering.

Alternatively, operation may be from a single high-volt-

age battery supply with a power control resistor to

reduce the power dissipation in the SLIC.

4

Agere Systems Inc.

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