5042 series
FUNCTIONAL DESCRIPTION
Frequency Adjustment Function
The 5042 series ICs have a built-in oscillator frequency adjustment function. The frequency adjustment set-
tings are written to and stored in internal EEPROM, making the devices easy to setup. A typical compensation
sequence is shown below.
50
40
30
50
40
30
Before adjustment
Before compensation
20
10
20
10
0
0
−10
−20
−30
−10
−20
−30
After compensation
After adjustment
−40
−50
−40
−50
−40 −20
0
20
40 60 80 100
−40 −20
0
20
40 60 80 100
Ta [°C]
Ta [°C]
Figure 3. Center frequency adjustment
Figure 4. Temperature rotation compensation
50
40
30
50
40
Before compensation
30
20
20
10
After compensation
10
0
0
−10
−20
−30
−10
−20
−30
After compensation
Before compensation
−40
−50
−40
−50
−40 −20
0
20
40 60 80 100
−40 −20
0
20
40 60 80 100
Ta [°C]
Ta [°C]
Figure 5. Low-temperature characteristics
compensation
Figure 6. High-temperature characteristics
compensation
SEIKO NPC CORPORATION—9
NPC [ NIPPON PRECISION CIRCUITS INC ]
