SA9105A
The formula for calculating the Output Frequency (f) is given below:
FOSC
3.58MHz
(II1 IV1) + (II2 IV2) + (I IV3)
I3
f = 11.16
FOUTX
*
*
*
2
3 I
R
*
Where FOUTX = Nominal rated frequency (4Hz, 290Hz or 1160Hz)
FOSC = Oscillator frequency (2MHz ...... 4MHz)
II1, II2, II3 = Input currents for current inputs (16µA at rated)
IV1, IV2, IV3 = Input currents for voltage inputs (14µA at rated)
IR
= Reference current (typically 50µA)
XTAL is a colour burst TV crystal (f = 3.5795 MHz) for the oscillator. The oscillator
frequency is divided down to 1.7897 MHz on-chip, to supply the digital circuitry and the
A/D converters.
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