MT88E45B
4-Wire Calling Number Identification Circuit 2
(4-Wire CNIC2)
Features
•
Compatible with:
• Bellcore GR-30-CORE, SR-TSV-002476,
ANSI/TIA/EIA-716, 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
FSKen+Tip/Ring CASen
IN1+
IN1-
GS1
IN2+
IN2-
GS2
V
REF
Bias
Generator
PWDN
Oscillator
+
-
Hybrid CASen
MODE
FSKen
PWDN
CASen
May 2003
Ordering Information
MT88E45BS
20 Pin SOIC
MT88E45BN
20 Pin SSOP
-40°C to 85°C
•
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’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 MT88E45B is suitable for
applications using a fixed power source (with a +/-
10% variation) between 3 and 5V.
MODE
•
•
•
•
•
•
•
•
•
Applications
•
•
•
+
-
PWDN
PWDN
Anti-Alias
Filter
PWDN
FSK
Bandpass
FSKen
CASen
2130Hz
Bandpass
2750Hz
Bandpass
FSK
Demodulator
Data Timing
Recovery
DATA
DCLK
CD
Mux
Carrier
Detector
DR
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
1
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