MegaCamera - Frame Rates

SI-3170

The SI-3170 MegaCamera has a Digital Clock Synthesizer capable of generating a range of frequencies from 40MHz to 100MHz.  The pixel sampling clock output rate will be at the input frequency divided by 2, as two pixels are read per clock. The frequency is set by a Register string command. A range of preset frequencies are listed below:  

Clock Rate

2056x1560
Frame Rate

1920x1080

1280x1024

1024x768

640x480

2056x200

41 MHz

12.3

15.3

19.1

25.4

40.7

97.6

45 MHz

13.5

16.7

20.9

27.9

44.6

107.1

50 MHz

15.0

18.6

23.3

31.0

49.6

119.0

55 MHz

16.5

20.5

25.6

34.1

54.6

131.0

60 MHz

18.5

22.3

27.9

37.2

59.5

142.9

65 MHz

20.0

24.2

30.2

40.3

64.5

154.8

70 MHz

21.6

26.0

32.6

43.4

69.4

166.7

75 MHz

23.1

27.9

34.9

46.5

74.4

178.6

80 MHz

24.6

29.8

37.2

49.6

79.4

190.5

85 MHz

26.2

31.6

39.5

52.7

84.3

202.4

90 MHz

27.7

33.5

41.9

55.8

89.3

214.3

95 MHz

29.3

35.3

44.2

58.9

94.2

226.2

100MHz

30.8

37.2

46.5

62.0

99.2

238.1

 

              1                                    
(# of Lines + 24)  *  2100 *  clock rate(ns))      =   # Frames Per Second

For very small windows and very high frame rate targets, the number of blanking rows (+ 24) can be reduced to 12, as long as the rows start and end is an integer number of 6 rows.

If there is a precise desired Video frame rate, the next highest frequency can be selected from the above chart and additional blanking clocks can be added to each line until the desired frame rate is achieved.  The minimum Line Time is 2100 clocks or 21usec/row at 100MHz.

SI-1280F

The SI-1280F has a Digital Clock Synthesizer capable of generating a range of frequencies from 20MHz to 60MHz.  The pixel data output rate is the same as the sampling clock rate. A range of preset frequencies are listed below. There are 150 clocks overhead per row for readout