HD49815TF Datasheet, PDF (11/22 Pages) Hitachi Semiconductor – Digital Camera Signal Processor

HD49815TF
Crystal Oscillation Circuit
1. Measuring conditions
The oscillation frequency was measured under the following conditions
V_CC1 = 5.0 V
V_CC2 = 3 V
Ta = 25°C
8 MHz, 20 MHz, and 24 MHz:
Rf = 1 to 10 MΩ
Cin, Cout = 20 pF (±20 pF)
32 MHz:
Rf = 1 to 10 MΩ
Cin = 20 pF (±20 pF)
Cout = 100 pF (±20 pF), Co = 15 pF (±5 pF), Lout = 1 µH
The conditions above may be changed within the range of measuring conditions.
2. Measuring method
Under the measuring conditions above, two methods were tested.
fmin. = 20 MHz, and fmax. = 32 MHz (applied to pins 26 and 27)
fmin. = 8 MHz, and fmax. = 24 MHz (applied to pins 34 and 35)
Note: The oscillation start time tosc is max. = 200 ms.
3. Measuring circuit
To the internal circuit
Xin
Xout
Dividing
counter
Monitor pin
Cin
Cout
Counter
Co
Lout
Note: The part enclosed by the dotted line in the above
circuit is used when measuring at 32 MHz.
Figure 1 Measuring Circuit
Rev.1.00 Jun 15, 2005 page 11 of 21