Simplifying IoT timing design with programmable MEMS oscillators
IoT devices place several timing demands on a very small circuit board. The microcontroller or system-on-chip needs a reference clock, the radio needs a stable frequency source, and the system needs a low-power time base that keeps running while the device sleeps.
Many of these products operate on batteries for years and are installed on factory equipment, vehicles, utility infrastructure, and outdoor enclosures, where shock, vibration, and temperature swings are routine. Product planning adds another layer of complexity. A single IoT platform often spans multiple variants with different clock frequencies and supply rails. When each variant requires its own quartz oscillator part number, procurement teams must qualify, forecast, and stock a growing list of components, and a lead-time disruption on one part can delay an entire product line.
How Programmable MEMS Oscillators Help
A MEMS oscillator uses a silicon resonator in place of a quartz crystal, along with a CMOS circuit that generates and conditions the output. As the output frequency is set by programming rather than by cutting a crystal, one MEMS platform can be configured for a wide range of frequencies, supply voltages, and stability grades. This simplifies inventory, shortens lead times, and makes it practical to change a clock frequency late in development without waiting for new quartz parts.
The low-mass silicon resonator also gives MEMS devices strong resistance to shock and vibration. Abracon's MEMS portfolio combines this durability with low power consumption and industry-standard packages, so designers can place MEMS devices on existing quartz footprints.
Selection Considerations for IoT Timing
Engineers should begin with performance and application fit: output frequency, stability over temperature, output logic type, and active and standby current. Supply voltage deserves particular attention, because a device that operates across a continuous voltage range can serve boards with different rails under one part number. For environmental and mechanical reliability, confirm the temperature range and the shock and vibration levels expected in service. For availability and lifecycle confidence, buyers should weigh lead times, package options, and whether a programmable family can cover future variants.
MEMS Oscillators at the Core of the Design
Abracon's AMMLP series is a programmable, low-power MEMS oscillator family intended for wearables, IoT, and industrial IoT designs. It covers 2.3 to 170 MHz and is offered in five industry-standard package sizes, including 2.0 x 1.6 mm (AMMLPA) and 2.5 x 2.0 mm (AMMLPD). Supply options of 1.8 V, 2.5 V, 3.3 V, and a continuous 2.25 V to 3.63 V range allow one configuration to serve multiple designs, and typical current consumption is 6.5 mA at 20 MHz with a 3.3 V supply.
The ASDMP, ASEMP, and ASVMP programmable series extend the portfolio across additional package sizes and output types. The ASEMP series, for example, comes in a 3.2 x 2.5 mm package with CMOS, HCSL, LVDS, or LVPECL outputs and complies with MIL-STD-883 shock and vibration requirements. For general microcontroller clocking, the featured ASDMB-25.000MHZ-LR-T provides a 25 MHz CMOS output in a 2.5 x 2.0 x 0.85 mm plastic QFN package.
Completing the IoT Timing Chain
In a complete IoT design, MEMS oscillators work alongside other Abracon timing devices. Cellular and GNSS radios typically require sub-ppm frequency stability, which is the role of a TCXO. The ATX-14 series fits a 1.6 x 1.2 mm package, covers 9.5 to 52 MHz, and maintains ±0.5 ppm stability from -40°C to +85°C with a clipped sine wave output and a continuous 1.68 V to 3.63 V supply range. The featured ATX-14-F-26.000MHZ-F05-T provides the 26 MHz reference commonly used by cellular and GNSS chipsets.
For timekeeping during sleep, the AB-RTCMC-32.768KHZ-AIGZ-S7-T integrates a 32.768 kHz crystal and RTC in a 3.2 x 1.5 x 0.8 mm package. It draws 350 nA at 3 V, keeps time down to 1.0 V, and includes a programmable watchdog with timeouts from 62.5 ms to 31 minutes, which helps recover devices that stop responding in the field. Designs that rely on a microcontroller's internal RTC can pair it with the ABS07-32.768KHZ-T, a 32.768 kHz tuning-fork crystal in a 3.2 x 1.5 mm package.
IoT data ultimately passes through gateways, edge servers, and network infrastructure with far tighter timing requirements. Abracon's ClearClock differential oscillators serve those systems; the AK2LP series, for example, delivers 117 fs typical RMS jitter at 156.25 MHz with a low-power HCSL output in a 2.5 x 2.0 mm package. For base stations and other synchronized network equipment, the AR50LC rubidium oscillator provides a 10 MHz reference with frequency stability specified in parts per billion.
Abracon Timing Solutions from Arrow
Arrow offers Abracon timing across six product groups: ClearClock differential oscillators (AK2A, AK2B, AK2LP, AK3A, AK3B, and AK3LP series), precision timing (AR50LC, ABCM-60, and AR36CPT series), MEMS oscillators (AMMLPA, AMMLPD, ASDMP, ASEMP, and ASVMP series), TCXOs (ATXK-H11, ATXAIG-H12, ATXAIG-H13, and ATXK-H14 series), real-time clocks (AB-RTC-XL and AB-RTCMC series), and quartz crystals (ABS and ABMx/ABMxW series).
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