MT8841 Datasheet, PDF (1/10 Pages) Mitel Networks Corporation – CMOS Calling Number Identification Circuit

CMOS MT8841
®
Calling Number Identification Circuit
Features
• 1200 baud BELL 202 and CCITT V.23
Frequency Shift Keying (FSK) demodulation
• Compatible with Bellcore TR-NWT-000030 and
SR-TSV-002476
• High input sensitivity: -36dBm
• Simple serial 3-wire data interface eliminating
the need for a UART
• Power down mode
• Internal gain adjustable amplifier
• Carrier detect status output
• Uses 3.579545 MHz crystal or ceramic
resonator
• Single 5V power supply
• Low power CMOS technology
Applications
• Calling Number Delivery (CND), Calling Name
Delivery (CNAM) and Calling Identity on Call
Waiting (CIDCW) features of Bellcore CLASS^SM
service
• Feature phones
• Phone set adjunct boxes
• FAX machines
• Telephone Answering machines
• Database query systems
ISSUE 4
Ordering Information
MT8841AE 16 Pin Plastic DIP
MT8841AS 16 Pin SOIC
MT8841AN 20 Pin SSOP
-40 °C to +85 °C
Description
May 1995
The MT8841 Calling Number Identification Circuit
(CNIC) is a CMOS integrated circuit providing an
interface to various calling line information delivery
services that utilize 1200 baud BELL 202 or CCITT
V.23 FSK voiceband data transmission schemes.
The CNIC receives and demodulates the signal and
outputs data into a simple 3-wire serial interface.
Typically, the FSK modulated data containing
information on the calling line is sent before alerting
the called party or during the silent interval between
the first and second ring using either CCITT V.23
recommendations or Bell 202 specifications.
The CNIC accepts and demodulates both CCITT
V.23 and BELL 202 signals. Along with serial data
and clock, the CNIC provides a data ready signal to
indicate the reception of every 8-bit character sent
from the Central Office. The received data can be
processed externally by a microcontroller, stored in
memory, or displayed as is, depending on the
application.
GS
IN-
-
IN+
+
Receive
Bandpass
Filter
FSK
Demodulator
Data and Timing
Recovery
DATA
DR
DCLK
CAP
V_Ref
Bias
Generator
Carrier
Detector
CD
Clock
Generator
to other
circuits
PWDN
CLASS^SM is a service mark of Bellcore
OSC1 OSC2
V_SS V_DD IC1 IC2
Figure 1 - Functional Block Diagram
5-11