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This HYB packaging of the AS3394 in a DIL 20 pin outline is specifically designed to serve as a replacement for legacy CEM3394 devices in existing systems. It is pin-to-pin functionally and mechanically compatible with CEM3394. New designs should use the AS3394 in the SOIC-24 pin package for more features and a smaller footprint.
The ALFA RPAR AS3394 is a complete analog music synthesizer "voice" on a single chip designed for computer interfacing for software-based control. Requiring a bare minimum of other external components, the AS3394 is ideal for low cost polyphonic or polytimbric musical instruments featuring rich, analog sound.
Included inside the compact 24 pin package is fully temperature compensated, wide range, voltage controlled oscillator providing sub-oscillator, triangle, saw-tooth, and pulse waveforms; a voltage controlled mixer for adjusting the balance between the internally generated VCO waveforms and any external signal; a dedicated four-pole low-pass voltage controlled filter with voltage controlled resonance; a modulation VCA for modulating the filter frequency by the triangle waveform output of the VCO; and a final VCA for allowing the output to be enveloped. Envelope control for both the VCF and final VCA may be provided by either a hardware envelope generator such as the AS3310 or through software.
All eight control inputs are provided with internal very high input impedance, low bias current buffers. Thus interface to a microprocessor system may be accomplished simply with a single DAC, 4051-type CMOS multiplexer, and 8 hold capacitors.
