MC145740 Datasheet, PDF (1/12 Pages) Motorola, Inc – DUAL TONE MULTIPLE FREQUENCY LINE INTERFACE

MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
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Dual Tone Multiple Frequency
Line Interface
The MC145740 is a silicon gate HCMOS LSI designed for general purpose
Dual Tone Multiple Frequency (DTMF) communications, and contains a DTMF
signal generator and a receiver for all 16 standard digits.
The generator block has a differential line driver which drives a 600 Ω load
with 0 dBm level. The transmit signal level is adjusted in 1 dB steps by the
programmable attenuator.
The receiver block has an Auto Gain Control (AGC) amplifier to demodulate
50 dB (typ) dynamic range of DTMF signals to the hexadecimal codes.
The device also includes a serial control interface that permits a CPU to
exercise the following built–in features.
• Single Power Supply: 3.6 to 5.5 V
• DTMF Generator and Receiver for All 16 Standard Digits
• 0 dBm Line Driver Into 600 Ω Load
• AGC Amplifier
• Programmable Transmit Attenuator
• Serial Control Interface
• Power Down Mode, Less Than 1 µA
AGCout
BLOCK DIAGRAM
FC1 FC2
MC145740
20
F SUFFIX
1
SOG PACKAGE
CASE 751J
ORDERING INFORMATION
MC145740F SOG Package
PIN ASSIGNMENT
TxA1 1
TxA2 2
RxA 3
AGCout 4
Vref 5
FC1 6
FC2 7
X1 8
X2 9
VSS 10
20 DSI
19 VDD
18 VSS
17 CLK
16 EN
15 DATA
14 R/W
13 TD
12 DV
11 VDD
RxA
Rx GAIN
CONTROL
WITH AGC
ANTI–ALIAS
FILTER
HIGH–BAND
BPF
DTMF
DETECTER
TIMING
CIRCUIT
AMP
LOW–BAND
BPF
DSI
TxA2
TxA1
–1
SMOOTHING
–
FILTER AND
+
Tx GAIN
CONTROL
CLOCK
GENERATOR
DTMF
GENERATOR
CONTROL REGISTER
AND
SERIAL INTERFACE
DV
TD
EN
CLK
DATA
R/W
X1 X2
VDD VSS Vref
This document contains information on a product under development. Motorola reserves the right to change or discontinue this product without notice.
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MC145740
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