MT88E45BS Datasheet

IC型號：
MT88E45BS
PDF描述：
4-Wire Calling Number Identification Circuit 2
文件大?。?/label>
491.32KB
PDF頁數(shù)：
28頁
芯片廠家：
ZARLINK

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MT88E45B

4-Wire Calling Number Identification Circuit 2

(4-Wire CNIC2)

Features

鈥?/div>

Compatible with:

鈥?Bellcore GR-30-CORE, SR-TSV-002476,

ANSI/TIA/EIA-716, TIA/EIA-777;

鈥?ETSI ETS 300 778-1 (FSK only variant) & -2;

鈥?BT (British Telecom) SIN227 & SIN242

Bellcore 鈥楥PE Alerting Signal鈥?(CAS), ETSI

鈥楧ual Tone Alerting Signal鈥?(DT-AS), BT Idle

State and Loop State 鈥楾one Alert Signal鈥?/div>

detection

1200 baud Bell 202 and CCITT V.23 FSK

demodulation

Separate differential input amplifiers with

adjustable gain for Tip/Ring and telephone

hybrid or speech IC connections

Selectable 3-wire FSK data interface (bit

stream or 1 byte buffer)

Facility to monitor the stop bit for framing error

check

FSK Carrier detect status output

3 to 5V +/- 10% supply voltage

Uses 3.579545MHz crystal or ceramic

resonator

Low power CMOS with power down

Bellcore CID (Calling Identity Delivery) and

CIDCW (Calling Identity Delivery on Call

Waiting) telephones and adjuncts

ETSI, BT CLIP (Calling Line Identity

Presentation) and CLIP with Call Waiting

telephones and adjuncts

Fax and answering machines

Computer Telephony Integration (CTI) systems

FSKen+Tip/Ring CASen

IN1+

IN1-

GS1

IN2+

IN2-

GS2

REF

Bias

Generator

PWDN

Oscillator

Hybrid CASen

MODE

FSKen

PWDN

CASen

May 2003

Ordering Information

MT88E45BS

20 Pin SOIC

MT88E45BN

20 Pin SSOP

-40擄C to 85擄C

鈥?/div>

Description

The MT88E45B is a low power CMOS integrated

circuit suitable for receiving the physical layer

signals used in North American (Bellcore) Calling

Identity Delivery on Call Waiting (CIDCW) and

Calling Identity Delivery (CID) services. It is also

suitable for ETSI and BT Calling Line Identity

Presentation (CLIP) and CLIP with Call Waiting

services.

The MT88E45B contains a 1200 baud Bell 202/

CCITT V.23 FSK demodulator and a CAS/DT-AS

detector. Two input op-amps allow the MT88E45B to

be connected to both Tip/Ring and the telephone

hybrid or speech IC receive pair for optimal CIDCW

telephone

architectural

implementation.

FSK

demodulation is always on Tip/Ring, while CAS

detection can be on Tip/Ring or Hybrid Receive. Tip/

Ring CAS detection is required for the Bellcore/TIA

Multiple Extension Interworking (MEI) and BT鈥檚 on-

hook CLIP. A selectable FSK data interface allows

the data to be processed as a bit stream or extracted

from a 1 byte on chip buffer. Power management has

been incorporated to power down the FSK or CAS

section when not required. Full chip power down is

also available. The MT88E45B is suitable for

applications using a fixed power source (with a +/-

10% variation) between 3 and 5V.

MODE

鈥?/div>

Applications

鈥?/div>

PWDN

Anti-Alias

Filter

PWDN

FSK

Bandpass

FSKen

CASen

2130Hz

Bandpass

2750Hz

Bandpass

FSK

Demodulator

Data Timing

Recovery

DATA

DCLK

Mux

Carrier

Detector

STD

DR/STD

Tone

Detection

Algorithm

Guard

Time

ST/GT

EST

Vdd

Vss

Control Bit

Decode

CASen

CB0 CB1 CB2

OSC1

OSC2

Figure 1 - Functional Block Diagram

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