MT88E45B Datasheet, PDF (1/28 Pages) Zarlink Semiconductor Inc – 4-Wire Calling Number Identification Circuit 2

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
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
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.
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
Carrier
Detector
Tone
Detection
Algorithm
OSC1 OSC2 CB0 CB1 CB2
Figure 1 - Functional Block Diagram
MODE
Data Timing
Recovery
DR
STD
Guard
Time
DATA
DCLK
CD
DR/STD
ST/GT
EST
Vdd
Vss
1