SDK135SLASHD datasheet(18/52 Pages) FREESCALE

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1-4

Type 1 Telephony Features Library

MOTOROLA

Introduction

The rest of this section describes the operation at a system level of a generic FSK receiver, the major com-

ponent of this Library. Figure 1-1 provides a high-level example of a generic FSK receiver used in the

Type 1 Telephony Features Library. The FSK receiver is shown inside the dashed lines in Figure 1-1. The

components shown outside the dashed lines are not supplied with the Type 1 Telephony Features Library.

Figure 1-1. The Functional Blocks of a Generic Type 1 Telephony Solution

The FSK receiver performs noise filtering, signal detection, demodulation, and framing, then passes Caller

ID (or VMWI, etc.) to the application layer to display on the CPE. The FSK receiver is always enabled, so

it can receive VMWI without power ringing. If receiving Caller ID, power ringing will be signaled to the

DSP to disable the FSK receiver during the ringing. The digital samples must be collected with an ADC at

Tip

Ring

DAA

ADC

BPF

AGC

Demodulator

LPF

Decision Maker

Slicer

Framing

Parser

Functional

Blocks of a

Generic FSK

Receiver

Screen

Hour : Minute

Month : Day

Number

Name

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SDK135/D Datasheet(PDF) 18 Page - Freescale Semiconductor, Inc