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ML7020
FEDL7020-02 Semiconductor 1 ML7020 This version: Nov. 2000 Previous version: Feb. 2000 1200 bps MODEM for Remote Control Systems GENERAL DESCRIPTION The ML7020 is a 1200 bps modem LSI developed for remote control systems. The functions incorporated are those of a 1200 bps FSK modem conforming to ITU-T Recommendations V.23, DTMF signal generation and detection, call progress tone (CPT) generation and detection. Each functional block can be controlled via a 4-bit processor interface. FEATURES • Single 5 V power supply operation (VDD: 4.5 to 5.5 V) • Low power consumption: During operation: 5 mA typ. During the power down mode: 7 µA typ. • Built-in 1200 bps modem conforming to ITU-T V.23 recommendations • Built-in DTMF signal generator with a switchable 6-dB attenuator • Built-in DTMF detector (the input can be selected from either the line or the terminal) • Built-in call progress tone generator. The output frequency can be selected from 400 Hz and 800 Hz. • Built-in call progress tone detector • Three analog input systems (switchable) • Analog output for the line is of the differential type and can drive a 600 Ω line transformer. • Analog output for the terminal is of the single-ended type and can drive a 1.2 kΩ load. • Built-in switch for selecting the 600 Ω termination • 4-Bit processor interface • Built-in oscillator circuit for a 3.579545 MHz crystal • Package: 32-Pin plastic SSOP (SSOP32-P-430-1.00-K) (Product name: ML7020MB) 1/19
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