MC145740

MOTOROLA SEMICONDUCTOR TECHNICAL DATA Order this document by MC145740/D MC145740 Product Preview 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 20 1 F SUFFIX SOG PACKAGE CASE 751J ORDERING INFORMATION MC145740F SOG Package PIN ASSIGNMENT TxA1 TxA2 RxA AGCout Vref FC1 FC2 X1 X2 VSS 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 DSI VDD VSS CLK EN DATA R/W TD DV VDD BLOCK DIAGRAM AGCout FC1 FC2 RxA Rx GAIN CONTROL WITH AGC AMP ANTI–ALIAS FILTER HIGH–BAND BPF LOW–BAND BPF TIMING CIRCUIT DTMF DETECTER DV TD DSI SMOOTHING FILTER AND Tx GAIN CONTROL EN CLK DATA R/W TxA2 TxA1 –1 – + DTMF GENERATOR ...