RV-3049 datasheet(46/65 Pages) MICROCRYSTAL

46 / 65 page

Micro Crystal

DTCXO Temperature Compensated Real Time Clock / Calendar Module

RV-3049

46/65

Option B: parts individually calibrated based on generic temperature data

The Option: B devices are designed for an optimized trade off accuracy vs cost. Option B parts are individually

programmed to compensate the frequency deviation at 25°C but using generic batch data to compensate the

crystal’s temperature characteristics. Option B parts offer a good time accuracy at little cost.

XTAL offset:

Frequency deviation @ 25°C

Individually compensated

XTAL T0:

Turnover Temperature

Compensated with generic batch data

XTAL temp. coefficient: Frequency drift vs temperature

Compensated with generic batch data

Thermometer error:

Thermometer accuracy

Individually acquired at 25°C,

correction value individually embedded

in XTAL parameters

Samples of RV-3049 Opt: B parts are individually measured over the temperature range to derive the generic

batch data for the thermometer’s and crystal’s characteristics over the temperature range. Based on the

temperature data, frequency correction values are calculated and individually programmed into the

corresponding EEPROM register by the factory.

Below chart shows the time deviation of 30 tested devices over the temperature-range of individually calibrated

RTC’s (Opt: B) after the components were reflow soldered onto a PCB, the red dotted line shows the specified

time accuracy for Option: B devices.

Option B:

Temperature range

Time deviation

25°C

± 3 ppm

±0.26 seconds per day

0°C to + 50°C

± 5 ppm

±0.44 seconds per day

-10°C to + 60°C

±10 ppm

±0.87 seconds per day

-40°C to + 85°C

±25 ppm

±2.17 seconds per day

-40°C to +125°C

±30 ppm

±2.60 seconds per day

Option: B

(default)

Time Deviation vs. Temperature

-30

-25

-20

-15

-10

-5

-50

-40

-30

-20

-10

Temperature [°C]

RV-3049 Datasheet(PDF) 46 Page - MICORO CRYSTAL SWITZERLAND

RV-3049 Datasheet(HTML) 46 Page - MICORO CRYSTAL SWITZERLAND

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