MC145740F ,Dual Tone Multiple Frequency Line InterfaceMAXIMUM RATINGS (Voltages Referenced to V Unless Otherwise Noted)SSThis device contains circuitry t ..
MC145745FW ,V.21/V.23 Telemeter ModemMAXIMUM RATINGSThis device contains circuitry to protect theRating Symbol Value Unitinputs against ..
MC14574P ,CMOS MSI(PROGRAMMABLE DUAL OP AMP / DUAL COMPARATORMAXIMUM RATINGS? (Voltages referenced to V531Rating 7 Symbol Value UnitDC Supply Voltage VDD 7 0 51 ..
MC14575P ,CMOS MSI(PROGRAMMABLE DUAL OP AMP / DUAL COMPARATORMOTOROLAI SEMICONDUCTOR -i--i-l-ll-ll-lellMl.TECHNICAL DATAMCI4573MCI4574MC14575.1QUAD PROGRAMMABLE ..
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MC74AC574MG , Octal D Flip−Flop with 3−State Outputs
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MC74AC574N ,Octal D-Type Flip Flop with 3-State OutputsLOGIC DIAGRAMD D D D D D D D0 1 2 3 4 5 6 7CPC D C D C D C D C DC D C D C DQ Q Q Q QQ Q QOEO O O O ..
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MC145740F
Dual Tone Multiple Frequency Line Interface
Product Preview- --
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
BLOCK DIAGRAMRxA
DSI
TxA2
TxA1
AGCout FC1 FC2 X2 VDD VSS Vref
CLK
DATA
R/W
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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SEMICONDUCTOR TECHNICAL DATA
