MT8843 Datasheet, PDF (1/10 Pages) Mitel Networks Corporation – CMOS Calling Number Identification Circuit 2 Preliminary Information

CMOS MT8843
®
Calling Number Identification Circuit 2
Preliminary Information
Features
• Compatible with British Telecom (BT) SIN227 &
SIN242, Cable Television Association (CTA)
TW/P&E/312, and Bellcore TR-NWT-000030 &
SR-TSV-002476
• Ring and line reversal detection
• Bellcore "CPE Alerting Signal (CAS)" and BT
"Idle State Tone Alert Signal" detection
• 1200 baud BELL 202 and CCITT V.23
Frequency Shift Keying (FSK) demodulation
• High input sensitivity
• Dual mode 3-wire data interface
• Low power CMOS with powerdown mode
• Input gain adjustable amplifier
• Carrier detect status output
• Uses 3.58 MHz crystal or ceramic resonator
Applications
• BT Calling Line Identity Presentation (CLIP),
CTA CLIP, and Bellcore Calling Identity Delivery
(CID) systems
• 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
ISSUE 1
February 1995
Ordering Information
MT8843AE 24 Pin Plastic DIP
MT8843AS 24 Pin SOIC
-40 °C to +85 °C
Description
The MT8843 Calling Number Identification Circuit 2
(CNIC2) is a low power CMOS integrated circuit
intended for receiving physical layer signals
transmitted according to BT (British Telecom)
SIN227 & SIN242, CTA (Cable TV Association) TW/
P&E/312 and Bellcore TR-NWT-000030 & SR-TSV-
002476 specifications.
The CNIC2 provides all the features and functions
offered by Mitel’s MT8841 (CNIC), including 1200
baud BELL 202 and CCITT V.23 FSK demodulation.
The 3-wire serial FSK interface provided by CNIC
has been enhanced to operate in two modes. The
first mode is the CNIC compatible mode whereby
data transfer is initiated by the device. The new,
second mode allows a microcontroller to extract 8-bit
data words from the device. Furthermore, CNIC2
offers Idle State Tone Alert Signal and line reversal
detection capability for BT’s CLIP, ring burst
detection for CTA’s CLIP, and ring detection for
Bellcore’s CID.
FSKen MODE
IN+
IN-
GS
VRef
CAP
PWDN
+
Anti-alias
FSK Bandpass
FSK
Data Timing
-
Filter
Filter
Demodulator
Recovery
To internal
cct.
Bias
Generator
To internal cct.
Oscillator
Alert Signal High
Tone Filter
Alert Signal Low
Tone Filter
Carrier
Detector
Tone
Detection
Algorithm
Interrupt
Generator
Guard
Time
DCLK
DATA
DR
CD
INT
StD
St/GT
ESt
VDD
VSS
OSCin OSCout TRIGin TRIGRC
TRIGout
Figure 1 - Functional Block Diagram
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