The LM628/LM629 are dedicated motion-control processors designed for use with a variety of DC and brushless DC servo motors, and other servomechanisms which provide aquadrature incremental position feedback signal. The partsperform the intensive, real-time computational tasks requiredfor high performance digital motion control. The host controlsoftware interface is facilitated by a high-level command set.The LM628 has an 8-bit output which can drive either an8-bit or a 12-bit DAC. The components required to build aservo system are reduced to the DC motor/actuator, anincremental encoder, a DAC, a power amplifier, and theLM628. An LM629-based system is similar, except that itprovides an 8-bit PWM output for directly driving H-switches.The parts are fabricated in NMOS and packaged in a 28-pindual in-line package or a 24-pin surface mount package(LM629 only). Both 6 MHz and 8 MHz maximum frequencyversions are available with the suffixes -6 and -8, respectively, used to designate the versions. They incorporate an SDA core processor and cells designed by SDA.
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