The NTE864 is a precision waveform generator in a 14-Lead DIP type package capable of producing high accuracy sine, square, triangular, sawtooth and pulse waveforms. The frequency (or repetition rate) can be selected externally from 0.001Hz to 300kHz. The frequency of oscillation is highly stable over a wide range of temperature and supply voltage changes. Both full frequency sweeping as well as smaller frequency variations (FM) can be accomplished with an external control voltage. Each of the three basic waveforms, i.e., sinewave, triangle and square wave outputs are available simulta‐ neously.
 
Full spec sheet:
https://www.nteinc.com/specs/800to899/pdf/nte864.pdf