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PS398ESEE Datasheet(PDF) 10 Page - Pericom Semiconductor Corporation |
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PS398ESEE Datasheet(HTML) 10 Page - Pericom Semiconductor Corporation |
10 / 11 page 10 PS8185F 09/28/04 12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012 12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012123456789012 PS398/PS399 Precision 8-Ch, Diff. 4-Ch, 17V Analog Multiplexers The table below shows how many time constants (m τ) are needed to reach an accuracy of one LSB. τ = RON x CCOM(ON) Bits Accuracy (%) m 8 0.25 6 12 0.012 9 15 0.0017 11 Now, let’s calculate what the maximum sampling rate for the PS398. Assume a 12-bit accuracy and room temperature operation. Figure 10. Equivalent model of one multiplexer channel VIN RS VS CCOM(ON) RON CL In equation (1) above, n = 8, tTRANS = 150ns, tSETTLING = 9 τ, τ=100ohmx54pF _______________________ , 8 [150ns + 9(100ohm x 54pF)] or fS = 630kHz. Assuming a x4 oversampling rate, the maximum sampling speed for the PS398 would be 630 ÷4 = 157kHz. f S = 1 |
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