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)