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MC9S12VR-Family - Data Sheet - Freescale Semiconductor

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ATD Electrical Specifications<br />

C.3.2 ATD Analog Input Parasitics<br />

VDDA<br />

PAD0-<br />

PAD5<br />

VSSA<br />

T jmax =130 o C<br />

Figure C-2. ATD Input Parasitics<br />

I leakp < 0.5µA<br />

I leakn < 0.5µA<br />

sampling time is 4 to 24 adc clock cycles of<br />

0.25MHz to 8MHz -> 96µs >= tsample >= 500ns<br />

920Ω < R path < 9.9KΩ<br />

(incl parasitics)<br />

<strong>MC9S12VR</strong> <strong>Family</strong> Reference Manual, Rev. 2.8<br />

3.7pF < S/H Cap < 6.2pF<br />

(incl parasitics)<br />

C bottom<br />

Switch resistance depends on input voltage, corner ranges are shown.<br />

Leakage current is guaranteed by specification.<br />

connected to low ohmic<br />

supply during sampling<br />

Complete 10bit conversion takes between 19 and 41 adc clock cycles<br />

528 <strong>Freescale</strong> <strong>Semiconductor</strong><br />

C top<br />

C top potential just prior to sampling is either<br />

a) ~ last converted channel potential or<br />

b) ground level if S/H discharge feature is enabled.

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