CMOS
MT88E43
Extended Voltage Calling Number
Identification Circuit 2
Features
•
Compatible with:
British Telecom (BT) SIN227 & SIN242
U.K.’s Cable Communications Association
(CCA) specification TW/P&E/312
• Bellcore GR-30-CORE (formerly known as
TR-NWT-000030) & SR-TSV-002476
Bellcore "CPE Alerting Signal (CAS)" and BT
"Idle State Tone Alert Signal" detection
Ring and line reversal detection
1200 baud Bell 202 and CCITT V.23 Frequency
Shift Keying (FSK) demodulation
3 or 5V
±10%
supply voltage
High input sensitivity (-40dBV Tone and FSK
Detection)
Selectable 3-wire data interface
(microcontroller or MT88E43 controlled)
Low power CMOS with powerdown mode
Input gain adjustable amplifier
Carrier detect status output
Uses 3.58 MHz crystal
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ISSUE 3
March 1997
Ordering Information
MT88E43AE 24 Pin Plastic DIP
(0.6 inch package only)
MT88E43AS 24 Pin SOIC
-40
°C
to +85
°C
•
•
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Feature phones, including Analog Display
Services Interface (ADSI) phones
Phone set adjunct boxes
FAX and answering machines
Database query and Computer Telephony
Integration (CTI) systems
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Description
The MT88E43 Calling Number Identification Circuit 2
(ECNIC2) is a low power CMOS integrated circuit
intended for receiving physical layer signals
transmitted according to BT (British Telecom)
SIN227 & SIN242, the U.K.’s CCA (Cable
Communications Association) TW/P&E/312 and
Bellcore
GR-30-CORE
&
SR-TSV-002476
specifications. The MT88E43 is suitable for
applications using a fixed voltage power source
between 3 and 5V
±10%.
Applications
•
BT Calling Line Identity Presentation (CLIP),
CCA CLIP, and Bellcore Calling Identity
Delivery (CID) systems
FSKen
IN+
IN-
GS
MODE
+
-
Anti-alias
Filter
FSK Bandpass
Filter
FSK
Demodulator
Data Timing
Recovery
DCLK
DATA
DR
To internal
cct.
VRef
CAP
PWDN
Bias
Generator
Carrier
Detector
Interrupt
Generator
Alert Signal High
Tone Filter
CD
INT
To internal cct.
Alert Signal Low
Tone Filter
Oscillator
Tone
Detection
Algorithm
Guard
Time
StD
St/GT
ESt
VDD
VSS
OSCin OSCout TRIGin
TRIGRC
TRIGout
Figure 1- Functional Block Diagram
5-53