KS58006

The KS58006 is DTMF/PULSE switchable dialer with a 32-digit redial which can be done using a slide switch. All necessary dual-tone frequencies are derived from a 3.579545 MHz TV crystal or ceramic resonator providing very high accuracy and stability. The required sinusoidal wave form for each individu al tone is digitally synthesized on the chip. The generated wave form has very low total harmonic distortion (7% max). A voltage reference is generated on the chip which is stable over the operating voltage and temperature range and regulates the single levels of the dual tone to meet telephone industry specifications. CMOS technology is applied to this device, for very low power requirements high noise immunity, and easy interface to a variety of telephones requiring external components.