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The SDC1742 is a hybrid 12‑bit synchro‑ or resolver‑to‑digital converter housed in a 32‑pin welded metal package with internal isolating transformers. It offers high accuracy (+8.5 arc‑min max), ratiometric conversion, three‑state latched outputs, and is available in industrial (0 °C to +70 °C) and military (‑55 °C to +125 °C) temperature versions. Typical applications include flight instrumentation, military servo control, artillery fire control, avionic systems, robotics, engine controllers, CNC machine tooling, and process control.
The datasheet lists electrical specifications such as supply currents (28 typ 35 max mA at +15 V), input voltage thresholds, enable/disable timing, and pin assignments. It also describes the theory of operation, data transfer methods using INHIBIT and BUSY signals, resistive scaling of inputs, dynamic performance graphs, reliability data, and ordering options. Mechanical dimensions are 1.74 × 1.14 × 0.28 in (44.2 × 28.9 × 7.1 mm) with a weight of 0.86 oz.
| Accuracy (SDC1742) | +8.5 arc‑min max |
|---|---|
| Resolution (SDC1742) | 12 bits |
| Signal & Reference Frequency | 2.6 kHz (Option X4Z) |
| Supply Current (+V5 = +15 V) | 28 typ 35 max mA |
| Input High Voltage | 2 V min |
| Input Low Voltage | 0.7 V max |
| Enable/Disable Time | 80 ns max |
| Busy Output Pulse Width | 400 ns typ |
| Dimensions | 1.74 × 1.14 × 0.28 in (44.2 × 28.9 × 7.1 mm) |
| Operating Temperature Range | ‑55 °C to +125 °C (military) / 0 °C to +70 °C (industrial) |
The SDC1742 provides an accuracy of up to +8.5 arc‑minutes maximum.
The converter is offered in an industrial range of 0 °C to +70 °C and a military range of ‑55 °C to +125 °C.
The device outputs a 12‑bit digital word.