MC145446A DTMF Transceiver Datasheet

MC145446A Datasheet, PDF, Equivalent


Part Number

MC145446A

Description

Single-Chip 300-Baud Modem with DTMF Transceiver

Manufacture

Motorola

Total Page 14 Pages
Datasheet
Download MC145446A Datasheet


MC145446A
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 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 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.
REV 1
7/96
©MOMoTtoOroRla,OInLc.A1996
MC145446A
1

MC145446A
AGC OUT
BLOCK DIAGRAM
FLTC2 FLTC3 FLTC1
DTMF
IN
AGC
RxBO
RxA
RxGC
30 k
+
65 k
NOISE
FILTER
NOISE
FILTER
LOW–BAND
BPF
HIGH–BAND
BPF
FREQUENCY
DETECTER
CODE
4 STATUS
CONVERTER REGISTER
(DECODER)
TIMING
CIRCUIT
SD/CD/DV
FSK/DTMF LOOPBACK PATH
TxD
TLA
LEVEL
CONTROL
FSK
MODULATOR
DTMF
GENERATOR
LOW–BAND
BPF
MUX
HIGH–BAND
BPF
MUX
MUX/
MIXING
CARRIER/CPT
DETECTOR
FSK
DEMODULATOR
CDA
RxD
DATA
I/O
R/W
MODE CONTROL
LOGIC
CONTROL
SHIFT REGISTER
STATUS
SHIFT REGISTER
SMOOTHING
FILTER
DSI
– 1 TxA2
_
+ TxA1
E
POWER–ON ANALOG GROUND
CLOCK
SCK
RESET
GENERATOR
GENERATOR
VCC GND Vref
X1 X2
MC145446A
2
MOTOROLA


Features MOTOROLA SEMICONDUCTOR TECHNICAL DATA Order this document by MC145446A/D MC1 45446A Product Preview Single-Chip 300 -Baud Modem with DTMF Transceiver The M C145446A is a silicon gate CMOS frequen cy shift keying (FSK) modem intended fo r use with telemeter systems or remote control systems over the telephone netw ork. It replaces the MC145446. This dev ice is compatible with CCITT V.21 and c ontains the entire circuit that provide s a full–duplex or half–duplex 300 baud data communication over a pair o f telephone lines. This device also inc ludes the DTMF generator/receiver and c all progress tone detector (CPTD). The differential line driver has the capabi lity of driving 0 dBm into a 600 Ω lo ad with a single 5 V power supply. The transmit level is controlled by the pro grammable attenuator in 1 dB steps. Thi s device also includes a serial control interface and internal control and sta tus registers that permit a CPU to exer cise the following built–in features: • • • • • • • • • • • Single 5 V .
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