MT88E41
CMOS
Extended Voltage Calling Number
Identification Circuit (ECNIC)
Data Sheet
Features
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1200 baud BELL 202 and CCITT V.23 Frequency
Shift Keying (FSK) demodulation
Compatible with Bellcore GR-30-CORE and SR-
TSV-002476
High input sensitivity: -36dBm minimum FSK
Detection Level
Simple serial 3-wire data interface eliminating the
need for a UART
Power down mode
Internal gain adjustable amplifier
Carrier detect status output
Uses 3.579545 MHz crystal
2.7 - 5.5V operation
Low power CMOS technology
DS5717
Issue 3
February 1998
Ordering Information
MT88E41AE 16 Pin Plastic DIP
MT88E41AS 16 Pin SOIC
MT88E41AN 20 Pin SSOP
-40
°C
to +85
°C
Description
The MT88E41 Extended Voltage Calling Number
Identification Circuit (ECNIC) is a CMOS integrated
circuit providing an interface to various calling line
information delivery services that utilize 1200 baud
BELL 202 or CCITT V.23 FSK voiceband data
transmission schemes. The ECNIC receives and
demodulates the signal and outputs data into a simple
3-wire serial interface.
Typically, the FSK modulated data containing
information on the calling line is sent before alerting the
called party or during the silent interval between the first
and second ring using either CCITT V.23
recommendations or Bell 202 specifications.
The ECNIC accepts and demodulates both CCITT V.23
and BELL 202 signals. Along with serial data and clock,
the ECNIC provides a data ready signal to indicate the
reception of every 8-bit character sent from the Central
Applications
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Calling Number Delivery (CND), Calling Name
Delivery (CNAM) and Calling Identity on Call
Waiting (CIDCW) features of Bellcore CLASS
SM
service
Feature phones
Phone sets, adjunct boxes
FAX machines
Telephone answering machines
Database query systems
Battery powered applications
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GS
IN-
IN+
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+
Receive
Bandpass
Filter
FSK
Demodulator
Data and Timing
Recovery
DATA
DR
DCLK
CAP
VRef
Bias
Generator
Carrier
Detector
CD
Clock
Generator
to other
circuits
PWDN
OSC1 OSC2
VSS
VDD IC1
IC2
Figure 1 - Functional Block Diagram
CLASS
SM
is a service mark of Bellcore
SEMICMF.019
1
ZARLINK [ ZARLINK SEMICONDUCTOR INC ]
