High Speed

Frame Rate Calculation

To calculate the frame rate for any clock rate the equation is:

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

MHz				SI-1280F Frame Rate
Clock Rate	1280x1024	1280 x 700	800 x 600	640x480	320x200	240x180	200 x 150	128x128
20 MHz	14	20	35	53	177	285	381	562
25 MHz	17	25	44	66	222	356	476	703
30 MHz	20	30	53	79	266	427	571	843
35 MHz	24	35	61	92	310	499	667	984
40 MHz	27	40	70	105	355	570	762	1124
45 MHz	31	45	79	119	399	641	857	1265
50 MHz	34	50	88	132	443	712	952	1405
55 MHz	38	55	96	145	488	783	1048	1546
60 MHz	41	60	105	158	532	855	1143	1686

Frame Rate Calculation

To calculate the frame rate for any clock rate the equation is:

( clock rate(Hz) ) = # Frames Per Second (fps)

( # of columns + 150) * ( # of rows)

Example: What is the frame rate, at 60MHz clock rate for an image size of 800 x 600?

60 x 10⁶ = 105 Frames Per Second (fps)

( 800 + 150) * ( 600 )

** FRAME RATES are based on ROLLING SHUTTER operation. Full-Frame Shutter requires the additional time for exposure for each frame. Subsampling frame rates are based on the resulting size of the subsampled image or window.

SI-6600

The SI-6600 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 163 clocks overhead per row for readout.

Clock Rate MHz	6.6MP	3.2MP	2.1MP	1.3MP	SVGA	VGA	QVGA	QQVGA
Clock Rate MHz	2200 x 3000	2048 x 1536	1600 x 1200	1280 x 1024	800 x 600	640 x 480	320 x 240	160 x 120
20 MHz	1	3	5	7	17	26	86	257
25 MHz	2	4	7	10	26	39	129	386
30 MHz	3	6	9	14	35	52	172	514
35 MHz	4	7	12	17	43	65	215	643
40 MHz	4	9	14	20	52	78	258	772
45 MHz	5	10	17	24	61	91	301	900
50 MHz	6	12	19	27	69	104	344	1029
55 MHz	6	13	21	30	78	117	387	1157
60 MHz	7	15	24	34	86	130	430	1286

Frame Rate Calculation

To calculate the frame rate for any clock rate the equation is:=

( clock rate(Hz) ) = # Frames Per Second (fps)

( # of columns + 162) * ( # of rows)

SI-6600 SUBSAMPLING

The SI-6600 can support full image preview using several subsampling modes:

Clock Rate MHz	1:1	4:1	9:1	16:1	36:1
Clock Rate MHz	2200 x 3000	1280 x 1024	738 x 1002	554 x 752	370 x 502
20 MHz	2.8	10	22	37	75
25 MHz	3.5	13	28	46	93
30 MHz	4.2	16	33	56	112
35 MHz	4.9	18	39	65	131
40 MHz	6	21	44	74	149
45 MHz	6.3	24	50	83	168
50 MHz	7.0	26	55	93	187
55 MHz	7.7	29	61	102	205
60 MHz	8.4	31	66	111	224

SI-1280F Frame Rate