VG6640 datasheet(110/126 Pages) STMICROELECTRONICS

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Application

VG6640, VD6640

110/126

DocID023597 Rev 11

11.4.1

Clock source

The image sensor can accept a square wave clock input of any frequency in the range of

12MHz to 50MHz.

The clock input has a Schmitt trigger and is high impedance in any mode including the

power off state.

11.4.2

Quartz crystal

When using a quartz crystal in combination with the image sensor’s internal oscillator block,

the crystal must meet the following specification.

Figure 38. Equivalent model of crystal

The internal oscillator block is not designed to operate with overtone type crystals.

Please contact your local STMicroelectronics support representative for further information

regarding the use of the crystal oscillator feature.

Table 62. Recommended crystal specifications

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

Crystal load capacitance(1)

1. CL = CA*CB/(CA+CB) + CO

815

Total crystal shunt capacitance

8pF < CL < 12pF

12pF < CL < 15pF

CA, CB

Total input or output

capacitance(2)

2. Including ball, board, component and parasitic capacitances

8pF < CL < 12pF

12pF < CL < 15pF

Crystal

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