MC145446A Datasheet, PDF (1/14 Pages) Motorola, Inc – SINGLE-CHIP 300-BAUD MODEM WITH DTMF TRANSCEIVER

MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
Product Preview
Single-Chip 300-Baud Modem
with DTMF Transceiver
The MC145446A is a silicon gate CMOS frequency shift keying (FSK)
modem intended for use with telemeter systems or remote control systems over
the telephone network. It replaces the MC145446.
This device is compatible with CCITT V.21 and contains the entire circuit that
provides a full–duplex or half–duplex 300–baud data communication over a pair
of telephone lines. This device also includes the DTMF generator/receiver and
call progress tone detector (CPTD).
The differential line driver has the capability of driving 0 dBm into a 600 Ω load
with a single 5 V power supply. The transmit level is controlled by the
programmable attenuator in 1 dB steps.
This device also includes a serial control interface and internal control and
status registers that permit a CPU to exercise the following built–in features:
• Single 5 V Power Supply
• Compatible with CCITT V.21
• DTMF Generator and Receiver for All 16 Standard Digits
• Capable of Driving 0 dBm into a 600 Ω Load (VCC = 5 V)
• AGC (Auto Gain Control) Amplifier for DTMF Receiver
• Imprecise Call Progress Tone (400 Hz) Detector
• A Transmit Attenuator Programmable in 1 dB Steps
• 2100 Hz Answer Tone Generator
• Serial Control Interface
• Analog Loopback Configuration for Self Test
• Power–Down Mode, Less than 1 µA
Order this document
by MC145446A/D
MC145446A
FW SUFFIX
SOP
CASE 751M
28
1
ORDERING INFORMATION
MC145446AFW SOP
PIN ASSIGNMENT
VCC 1
GND 2
Vref 3
CDA 4
DTMF IN 5
AGC OUT 6
FTLC2 7
FTLC3 8
X1 9
X2 10
TLA 11
GND 12
VCC 13
R/W 14
28 FTLC1
27 RxBO
26 RxGC
25 RxA
24 TxA1
23 TxA2
22 DSI
21 VCC
20 E
19 SCK
18 DATA I/O
17 TxD
16 RxD
15 SD/CD/DV
This document contains information on a new product. Specifications and information herein are subject to change without notice.
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MC145446A
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