The LR4089B/LR4089BN are monolithic tone dialer LSI that uses an inexpensive crystal reference to provide eight audio sinusoidal frequencies. Dual-Tone Multi-Frequency signals are obtained by mixing these frequencies.
LR4089
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The LR4089B/LR4089BN are monolithic tone dialer LSI that uses an inexpensive crystal reference to provide eight audio sinusoidal frequencies. Dual-Tone Multi-Frequency signals are obtained by mixing these frequencies.