* Comsat International, a McLean voice and data communications company, acquired Florida-based Convergence Communications and its subsidiaries, which provide broadband access throughout Central America, the Dominican Republic and Mexico. Comsat will acquire more than 90 percent of the outstanding shares of the company for an undisclosed price.

* BAE Systems North America of Rockville agreed to purchase all the stock of Practical Imagineering, a private Reston company that focuses on signal processing systems and software development, for $8.3 million in cash. Practical Imagineering is 10 years old and employs more than 30 engineers and scientists.

* Essex Corp. of Columbia named Lisa Jacobson executive vice president and chief financial officer. Jacobson was most recently with the government services subsidiary of Affiliated Computer Services that was purchased by Lockheed Martin, and she had previously been a division director for the General Accounting Office.

* InteliData Technologies, a Reston financial services software company, was notified by Nasdaq on June 18 that its common stock failed to maintain the minimum bid price of $1 during the past 30 consecutive trading days, violating Nasdaq's listing requirements. InteliData has until Dec. 13 to meet listing requirements, which typically mandate a $1 price for a minimum of 10 consecutive trading days. If it fails, InteliData stock will be delisted or moved to the Nasdaq SmallCap Market. Shares of InteliData closed yesterday at 57 cents, down 8 cents, or 12.3 percent.

Compiled from reports by Washington Post staff writers.