HT32F1653 datasheet(36/46 Pages) HOLTEK

Part #	HT32F1653

Description	32-bit ARM Cortex -M3 Microcontroller, up to 64KB Flash and 16KB SRAM with 1 MSPS

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Manufacturer	HOLTEK [Holtek Semiconductor Inc]

Direct Link	http://www.holtek.com

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�an�a�� 01�

3�-bit ARM® Co�tex™-M3 MCU

HT3�F16�3/HT3�F16�4

SAR ADC

CI

sample

RI

RS

VS

Figure 6 ADC Sampling Network Model

The worst case occurs when the extremities of the input range (0V and VREF) are sampled

consecutively. In this situation a sampling error below ¼ LSB is ensured by using the following

equation:

I

N

I

ADC

S

R

C

f

R

−

<

+ )

2

ln(

5

.

1

2

where fADC is the ADC clock frequency and N is the ADC resolution (N = 12 in this case). A safe

margin should be considered due to the pin/pad parasitic capacitances, which are not accounted for

in this simple model.

If, in a system where the A/D Converter is used, there are no rail-to-rail input voltage variations

between consecutive sampling phases, Rs may be larger than the value indicated by the equation

above.

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HT32F1653 Datasheet(PDF) 36 Page - Holtek Semiconductor Inc

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