STMicroelectronics has revealed a new radiation-hardened digital-to-analog converter (DAC) RHRDAC121 which operates down to 2.5V for use in modern, low-power system designs that older 3.3V parts cannot support. Typically used in circuits for telemetry, housekeeping, and precision sensor-gain adjustment, its features include an SPI-compatible serial output, internal voltage reference, and automatic power-on-reset to zero-volt output.
Consuming just 0.6mW at its maximum speed and supply voltage, the 12-bit 1Msps successive-approximation register (SAR) DAC helps reduce size, weight, and power (SWaP) in next-generation satellites. It leverages ST’s 130nm pure CMOS technology and ensures high precision with minimal external components, saving circuit complexity and board area.
Key Features of RHRDAC121 DAC
- 12-bit architecture
- Ensured monotonicity
- Rail-to-rail voltage output
- Power-on-reset to zero volt output
- Internal voltage reference
- SYNC interrupt facility
- 2.3 V to 3.6 V power supply range
- Power-down function
- Guaranteed over -55 °C to +125 °C ambient temperature
- Hermetic package
- 100 krad(Si) TID
- SEL-free up to 125 MeV.cm²/mg
- SMD: 5962R21208
- Mass: 0.42 g
This converter is QML-V qualified and comes in a hermetic ceramic package with gold or solder-dipped leads. Maintaining stable performance parameters in harsh conditions up to 100krad(Si) total ionizing dose (TID), the RHRDAC121 is single-event latch-up (SEL) -free up to 125MeV.cm²/mg. It is characterized for single-event transient (SET) and single-event upset (SEU) and ready for immediate deployment with no further up-screening required.
