RV-3029 Datasheet, PDF (46/67 Pages) MICORO CRYSTAL SWITZERLAND – DTCXO Temperature Compensated Real Time Clock

Micro Crystal
DTCXO Temperature Compensated Real Time Clock / Calendar Module
RV-3029
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
XTAL T₀:
Turnover Temperature
XTAL temp. coefficient: Frequency drift vs temperature
Thermometer error: Thermometer accuracy
Individually compensated
Compensated with generic batch data
Compensated with generic batch data
Individually acquired at 25°C,
correction value individually embedded
in XTAL parameters
Samples of RV-3029 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
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
± 5 ppm = ±0.44 seconds per day
±10 ppm = ±0.87 seconds per day
±25 ppm = ±2.17 seconds per day
±30 ppm = ±2.60 seconds per day
Option: B (default)
Time Deviation vs. Temperature
30
25
20
15
10
5
0
-5
-10
-15
-20
-25
-30
-50 -40 -30 -20 -10
0
10
20
30
40
50
60
70
80
90
Temperature [°C]
46/67