MT88E45 Datasheet, PDF (1/27 Pages) Mitel Networks Corporation – 4-Wire Calling Number Identification Circuit 2(4-Wire CNIC2)

MT88E45
4-Wire Calling Number Identification Circuit 2
Advance Information
(4-Wire CNIC2)
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
Applications
• 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
DS5143
ISSUE 2
March 1999
Ordering Information
MT88E45AS
20 Pin SOIC
-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.
IN1+
IN1-
GS1
IN2+
IN2-
GS2
V_REF
FSKen+Tip/Ring CASen
+
-
PWDN
Anti-Alias
Filter
PWDN
PWDN
+
-
Hybrid CASen
Bias
Generator
MODE
PWDN
FSKen
CASen
PWDN
Oscillator
Control Bit
Decode
FSK
Bandpass
FSKen
CASen
2130Hz
Bandpass
2750Hz
Bandpass
CASen
FSK
Demodulator
MODE
Data Timing
Recovery
Carrier
Detector
Tone
Detection
Algorithm
DR
STD
Guard
Time
DATA
DCLK
CD
DR/STD
ST/GT
EST
Vdd
Vss
OSC1 OSC2 CB0 CB1 CB2
Figure 1 - Functional Block Diagram
1