HD49815 View Datasheet(PDF) - Hitachi -> Renesas Electronics

Part Name

Description

Manufacturer

HD49815

Digital Camera Signal Processor

Hitachi -> Renesas Electronics 

HD49815TF

Crystal Oscillation Circuit

1. Measuring conditions

The oscillation frequency was measured under the following conditions.

VCC1 = 5.0 V

VCC2 = 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

12

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