RV-3049 datasheet(45/65 Pages) MICROCRYSTAL

45 / 65 page

Micro Crystal

DTCXO Temperature Compensated Real Time Clock / Calendar Module

RV-3049

45/65

5.4. TIME ACCURACY OPT: A / OPT: B

Option A: parts individually calibrated over the temperature range

To obtain the best possible accuracy over the temperature-range, Option A parts are individually calibrated over

the entire temperature range.

XTAL offset:

Frequency deviation @ 25°C

Individually compensated

XTAL T0:

Turnover temperature

Individually calibrated over temperature

XTAL temp. coefficient: Frequency drift vs temperature

Individually calibrated over temperature

Thermometer error:

Thermometer accuracy

Individually acquired over temperature,

correction value individually embedded

in XTAL parameters

Every part RV-3049 Opt: A is individually measured over the temperature range to derive thermometer’s and

crystal’s characteristics over the temperature range in order to achieve optimized time accuracy. 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 30 individually

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

specified time accuracy for Option: A devices.

Option A:

Temperature range

Time deviation

25°C

±3 ppm =

±0.26 seconds per day

0°C to + 50°C

±4 ppm =

±0.35 seconds per day

-10°C to + 60°C

±5 ppm =

±0.44 seconds per day

-40°C to + 85°C

±6 ppm =

±0.52 seconds per day

-40°C to +125°C

±8 ppm =

±0.70 seconds per day

Option: A

(calibrated)

Time Deviation vs. Temperature

-12.0

-10.0

-8.0

-6.0

-4.0

-2.0

0.0

2.0

4.0

6.0

8.0

10.0

12.0

-50

-40

-30

-20

-10

Temperature [°C]

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