DRC1745

The DRC1745 and DRC1746 are hybrid packaged Digital-to- Resolver converters. They accept a 14-bit or 16-bit digital input word representing angle and output sine and cosine voltages multiplied by an analog input. The converters maintain full accuracy when the analog input frequency is in the range dc to 2.6kHz.

The units have internal power amplifiers capable of driving a 2VA load which can be pure inductive, resistive or highly capacitive. The output is fully short-circuit protected against overcurrenr. The output of the converter can be used to drive directly into resolver control tnmsformers or in conjunction with an external transformer module to drive synchro control transformers. The power available is more than adequate to drive aU standard synchro control transformers.

The separately powered output stage is compatible with conventional ± 15V dc power supplies or pulsating power supplies with pedestal components as low as 3V dc.

The use of pulsating power supplies greatly reduces the internal power dissipation in the hybrid package which in turn maximizes the converter's Mean Time Between Failures (MTBF).

A particular feature of the converters is that they have a remote sensing facility which means that output accuracy can be maintained even when long lines have to be driven.

The converter's data inputs are latched and the latches can be CMOS or Low Power Schottky (LS). The former gives advantages in terms of power dissipation and the latter in terms of glitch performance when used in fast dynamic update modes. The latches are transparent and have a separate high and low byte enable.

As an option, the output stage can be fitted with internal Trans- Zorb™ protection. This gives full protection against transient voltages generated by an inductive load in response to an abrupt change in load current. This condition can occur at switch off or as a consequence of external power supply fault conditions.

The units are packaged in 4O-pin dual in line hybrid packages and require no external trims or adjustments.