The SDC/RDC1740/1741/1742 are hybrid 14- or 12-bit continuous tracking synchro or resolver-to-digital converters contained in 32-pin welded metal packages. The conversion process is performed by a monolithic IC manufactured in Analog Devices proprietary BIMOS II process that combines CMOS logic and bipolar high accuracy linear circuits on the same chip. Internal isolating micro-transformers are used to provide true isolation of the signal and reference inputs.
The datasheet details three models differing in resolution and accuracy: the 14-bit SDC1740, and 12-bit SDC1741 and SDC1742. These devices are available in industrial (0 to +70°C) and military (-55°C to +125°C) temperature ranges. They feature three-state latched outputs and separate ENABLE inputs for multiplexing.
| Resolution | 14-bit or 12-bit |
|---|---|
| Package | 32-pin welded metal package |
| Signal & Reference Frequency | 400 Hz or 2.6 kHz |
| Operating Temperature Range | -55°C to +125°C or 0 to +70°C |
| Output Coding | Parallel Natural Binary |
| Bandwidth | 450 kHz |
| Power Dissipation | 1.4 W max |
Applications include flight instrumentation, military servo control, artillery fire control, and robotics.
The SDC/RDC1740 has an overall accuracy of +5.3 arc minutes.
The SDC/RDC1742 is a 12-bit converter.
Options cover an industrial range of 0 to +70°C and a military range of -55°C to +125°C.