ST10F272B datasheet(145/181 Pages) STMICROELECTRONICS

No. de pieza	ST10F272B

Descripción Electrónicos	16-bit MCU with 256 Kbyte Flash memory and 12/20 Kbyte RAM

PDF	181 Pages

Scroll/Zoom	100%

Fabricante Electrónico	STMICROELECTRONICS [STMicroelectronics]

Página de inicio	http://www.st.com

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145 / 181 page

ST10F272B/ST10F272E

Electrical characteristics

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From this formula, in the worst case (when VA is maximum, that is for instance 5V),

assuming to accept a maximum error of half a count (~2.44mV), it is immediately evident a

constraints on CF value:

In the next section an example of how to design the external network is provided, assuming

some reasonable values for the internal parameters and making hypothesis on the

characteristics of the analog signal to be sampled.

Example of external network sizing

The following hypothesis are formulated in order to proceed in designing the external

network on A/D Converter input pins:

●

Analog Signal Source Bandwidth (f0):10kHz

●

conversion Rate (fC):25kHz

●

Sampling Time (TS):1µs

●

Pin Input Capacitance (CP1):5pF

●

Pin Input Routing Capacitance (CP2):1pF

●

Sampling Capacitance (CS):4pF

●

Maximum Input Current Injection (IINJ):3mA

●

Maximum Analog Source Voltage (VAM):12V

●

Analog Source Impedance (RS):100Ω

●

Channel Switch Resistance (RSW):500Ω

●

Sampling Switch Resistance (RAD):200Ω

2048 C

⋅

ST10F272B Datasheet(PDF) 145 Page - STMicroelectronics