MT-9560A Datasheet, PDF (4/7 Pages) Vectron International, Inc – Improved stability reduces system power with fewer network timekeeping updates

Description
The MT-9560A is an ultra-small and ultra-low power 32.768 kHz TCXO optimized for battery-powered applications. Vectron’s silicon MEMS
technology enables the first 32 kHz TCXO in the world’s smallest footprint and chip-scale packaging (CSP). Typical core supply current is
only 1 μA.
Vectron’s MEMS oscillators consist of MEMS resonators and a programmable analog circuit. Our MEMS resonators are built with a unique
MEMS First™ process. A key manufacturing step is EpiSeal™ during which the MEMS resonator is annealed with temperatures over 1000°C.
EpiSeal creates an extremely strong, clean, vacuum chamber that encapsulates the MEMS resonator and ensures the best performance
and reliability. During EpiSeal, a poly silicon cap is grown on top of the resonator cavity, which eliminates the need for additional cap
wafers or other exotic packaging. As a result, Vectron’s MEMS resonator die can be used like any other semiconductor die. One unique
result of Vectron’s MEMS First and EpiSeal manufacturing processes is the capability to integrate Vectron’s MEMS die with a SOC, ASIC,
microprocessor or analog die within a package to eliminate external timing components and provide a highly integrated, smaller, cheaper
solution to the customer.
TCXO Frequency Stability
The MT-9560A is factory calibrated (trimmed) over multiple frequency points to guarantee extremely tight stability over temperature.
Unlike quartz crystals that have a classic tuning fork parabola temperature curve with a 25°C turnover point with a 0.04 ppm/C2
temperature coefficient, the MT-9560A temperature coefficient is calibrated and corrected over temperature with an active temperature
correction circuit. The result is 32 kHz TCXO with extremely tight frequency variation over the -40°C to +85°C temperature range.
When measuring the MT-9560A output frequency with a frequency counter, it is important to make sure the counter’s gate time is
>100ms. The slow frequency of a 32kHz clock will give false readings with faster gate times.
Power Suppy Noise Immunity
In addition to eliminating external output load capacitors common with standard XTALs, this device includes special power supply filtering
and thus, eliminates the need for an external Vdd bypass-decoupling capacitor to keep the footprint as small as possible. Internal power
supply filtering is designed to reject more than 500 mV noise and frequency components from low frequency to more than 10 MHz.
Start-up and Steady-State Supply Current
The MT-9560A TCXO starts-up to a valid output frequency within 300 ms (150ms typ). To ensure proper start-up, Vdd power-supply ramp,
from a power-down state to 90% of final Vdd, must be less than 100ms.
During initial power-up, the MT-9560A power-cycles internal blocks, as shown in the power-supply start-up and steady state plot in the
Typical Operating Curves section. Power-up and initialization is typically 200 ms, and during that time, the peak supply current reaches 28
μA as the internal capacitors are charged, then sequentially drops to its 990 nA steady-state current. During steady-state operation, the
internal temperature compensation circuit turns on every 350 ms for a duration of approximately 10 ms.
Output Voltage
The MT-9560A has standard LVCMOS output swing. For DC-coupled applications, output VOH and VOL are individually factory programmed
to the customers’ requirement. VOH programming range is between 600 mV and 1.225V in 100 mV increments. Similarly, VOL
programming range is between 350 mV and 800 mV. For example; a PMIC or MCU is internally 1.8V logic compatible, and requires a 1.2V
VIH and a 0.6V VIL.
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Vectron International • 267 Lowell Road, Hudson, NH 03051 • Tel: 1-88-VECTRON-1 • http://www.vectron.com
Rev 1.3 June 2015