MT88E45
4-Wire Calling Number Identification Circuit 2
Advance Information
DS5143
(4-Wire CNIC2)
ISSUE 3
September 2001
Features
•
Compatible with:
• Bellcore GR-30-CORE, SR-TSV-002476,
ANSI/TIA/EIA-716, draft TIA/EIA-777;
• ETSI ETS 300 778-1 (FSK only variant) & -2;
• BT (British Telecom) SIN227 & SIN242
Bellcore ‘CPE Alerting Signal’ (CAS), ETSI ‘Dual
Tone Alerting Signal’ (DT-AS), BT Idle State and
Loop State ‘Tone Alert Signal’ 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
Ordering Information
MT88E45AS
20 Pin SOIC
MT88E45AN
20 Pin SSOP
-40°C to 85°C
•
Description
The MT88E45 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 MT88E45 contains a 1200 baud Bell 202/CCITT
V.23 FSK demodulator and a CAS/DT-AS detector.
Two input op-amps allow the MT88E45 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 Bellcore’s
proposed Multiple Extension Interworking (MEI) and
BT’s 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 MT88E45 is
suitable for applications using a fixed power source
(with a +/-10% variation) between 3 and 5V.
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Applications
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FSKen+Tip/Ring CASen
IN1+
IN1-
GS1
PWDN
MODE
FSK
Bandpass
FSKen
CASen
Mux
Carrier
Detector
DR
STD
Tone
Detection
Algorithm
Guard
Time
FSK
Demodulator
Data Timing
Recovery
DATA
DCLK
+
-
PWDN
Anti-Alias
Filter
PWDN
CD
DR/STD
IN2+
IN2-
GS2
V
REF
+
-
Hybrid CASen
MODE
PWDN
CASen
2130Hz
Bandpass
2750Hz
Bandpass
Bias
Generator
PWDN
Oscillator
FSKen
ST/GT
EST
Vdd
Vss
Control Bit
Decode
CASen
OSC1
OSC2
CB0 CB1 CB2
Figure 1 - Functional Block Diagram
1
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