RV-3029 Datasheet, PDF (45/67 Pages) MICORO CRYSTAL SWITZERLAND – DTCXO Temperature Compensated Real Time Clock

Micro Crystal
DTCXO Temperature Compensated Real Time Clock / Calendar Module
RV-3029
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
XTAL T₀:
Turnover temperature
XTAL temp. coefficient: Frequency drift vs temperature
Thermometer error: Thermometer accuracy
Individually compensated
Individually calibrated over temperature
Individually calibrated over temperature
Individually acquired over temperature,
correction value individually embedded
in XTAL parameters
Every part RV-3029 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
25°C
0°C to + 50°C
-10°C to + 60°C
-40°C to + 85°C
-40°C to +125°C
Time deviation
±3 ppm = ±0.26 seconds per day
±4 ppm = ±0.35 seconds per day
±5 ppm = ±0.44 seconds per day
±6 ppm = ±0.52 seconds per day
±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
0
10
20
30
40
50
60
70
80
90
Temperature [°C]
45/67