C8051F411EK Silicon Laboratories Inc, C8051F411EK Datasheet - Page 58

• Manufacturer Part Number: C8051F411EK
• Description: KIT EVAL FOR C8051F411
• Manufacturer: Silicon Laboratories Inc
• Type: MCUr

Specifications of C8051F411EK

• Contents: Evaluation Board, CD-ROM, USB Cable, Batteries and User Guide
• Processor To Be Evaluated: C8051F41x
• Interface Type: USB
• Silicon Manufacturer: Silicon Labs
• Core Architecture: 8051
• Silicon Core Number: C8051F411
• Silicon Family Name: C8051F41x
• Kit Contents: LCD Based Evaluation Board, USB Cable, Software CD And Quick-Start Guide
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• For Use With/related Products: Silicon Laboratories C8051F41x
• For Use With: 336-1315 - KIT REF DESIGN VOICE RECORD F41X
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 336-1317

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