AR0330 Datasheet, PDF (51/77 Pages) ON Semiconductor – CMOS Digital Image Sensor

AR0330: 1/3-Inch CMOS Digital Image Sensor
Sensor Frame Rate
Sensor Frame Rate
The time required to read out an image frame (T_FRAME) can be derived from the number
of clocks required to output each image and the pixel clock.
The frame-rate is the inverse of the frame period.
fps=1/T_FRAME
(EQ 18)
The number of clocks can be simplified further into the following parameters:
• The number of clocks required for each sensor row (line_length_pck)
This parameter also determines the sensor row period when referenced to the sensor
readout clock. (T_ROW = line_length_pck x 1/CLK_PIX)
• The number of row periods per frame (frame_length_lines)
• An extra delay between frames used to achieve a specific output frame period
(extra_delay)
T_FRAME=1/(CLK_PIX) ×[frame_length_lines × line_length_pck + extra_delay]
(EQ 19)
Figure 35: Frame Period Measured in Clocks
frame_length_lines = active rows + VB
AR0330_DS Rev. U Pub. 4/15 EN
51
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