ST10F296 datasheet(311/346 Pages) STMICROELECTRONICS

311 / 346 page

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ST10F296E

Electrical characteristics

311/346

Equation 38

Equation 36, and Equation 38 define respectively the three elements of an external circuit,

RF, CF, and RL. Next, some conditions which are used to size the circuit must be verified.

The first of these is a calculation which allows the accuracy error, introduced by the switched

capacitance equivalent resistance, to be minimized. This is given in Equation 39.

Equation 39

The error due to the voltage partitioning between the real resistive path and CS is less then

half a count if considering the worst case when VA = 5 V (see Equation 40).

Equation 40

The other conditions to verify are if the time constants of the transients are shorter than the

sampling period duration, TS, and whether the distance is significant. These calculations are

given in Equation 41 and Equation 42.

Equation 41

Equation 42

For a complete set of parameter characterization of the ST10F296E ADC equivalent circuit,

refer to Table 166: ADC characteristics on page 302.

24.8

AC characteristics

24.8.1

Test waveforms

Figure 102. Input/output waveforms

AC inputs during testing are driven at 2.4 V for a logic 1 and at 0.4 V for a logic 0.

Timing measurements are made at VIH min. for a logic 1 and VIL max for a logic 0.

INJ

⁄

() R

–

2.9k

Ω

–

CCS

⁄

10M

Ω

() R

⁄

2.35mV

⁄

()LSB

() C

2.8ns

µs

()

290ns

µs

2.4 V

0.4 V

Test points

2.0 V

0.8 V

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ST10F296 데이터시트(PDF) 311 Page - STMicroelectronics

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