The SA828 PWM generator has been designed to provide waveforms for the control of variable speed AC machines, uninterruptible power supplies and other forms of power electronic devices which require pulse width modulation as a means of efficient power control. The six TTL level PWM outputs (Fig. 2) control the six switches in a three-phase inverter bridge. This is usually via  an  external isolation and amplification stage.
The SA828 is fabricated in CMOS for low power consumption.

FEATURES
■Fully Digital Operation
■Interfaces with Most Microprocessors
■Wide Power-Frequency Range
■12-Bit Speed Control Accuracy
■Carrier Frequency Selectable up to 24kHz
■Waveform Stored in Internal ROM
■Double Edged Regular Sampling
■Selectable Minimum Pulse Width and Underlap Time
■DC Injection Braking