C8051F410-TB Silicon Laboratories Inc, C8051F410-TB Datasheet - Page 58

• Manufacturer Part Number: C8051F410-TB
• Description: BOARD PROTOTYPING W/C8051F410
• Manufacturer: Silicon Laboratories Inc
• Type: MCUr

Specifications of C8051F410-TB

• Contents: Board
• Processor To Be Evaluated: C8051F41x
• Interface Type: USB
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• For Use With/related Products: C8051F410
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

C8051F410/1/2/3
5.3.6. Settling Time Requirements
A minimum tracking time is required before an accurate conversion can be performed. This tracking time is
determined by the AMUX0 resistance, the ADC0 sampling capacitance, any external source resistance,
and the accuracy required for the conversion.
Figure 5.6 shows the equivalent ADC0 input circuit. The required ADC0 settling time for a given settling
accuracy (SA) may be approximated by Equation 5.1. When measuring V
reduces to R
Where:
SA is the settling accuracy, given as a fraction of an LSB (for example, 0.25 to settle within 1/4 LSB)
t is the required settling time in seconds
R
n is the ADC resolution in bits (12).
58
TOTAL
is the sum of the AMUX0 resistance and any external source resistance.
MUX
. See Table 5.3 and Table 5.4 for ADC0 minimum settling time requirements.
Equation 5.1. ADC0 Settling Time Requirements
Figure 5.6. ADC0 Equivalent Input Circuits
Px.x
t
=
ln
RC


MUX Select
Input
------ -
SA
2
n
= R



MUX
Rev. 1.1
R
R
* C
TOTAL
MUX
SAMPLE
= 5
C
k
SAMPLE
C
SAMPLE
DD
= 12 pF
with respect to GND, R
TOTAL