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C8051F124-GQR Datasheet(PDF) 59 Page - Silicon Laboratories

Part No. C8051F124-GQR
Description  Mixed Signal ISP Flash MCU Family
Download  350 Pages
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Manufacturer  SILABS [Silicon Laboratories]
Direct Link  http://www.silabs.com
Logo SILABS - Silicon Laboratories

C8051F124-GQR Datasheet(HTML) 59 Page - Silicon Laboratories

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C8051F120/1/2/3/4/5/6/7
C8051F130/1/2/3
Rev. 1.4
59
5.2.3. Settling Time Requirements
A minimum tracking time is required before an accurate conversion can be performed. This tracking time is
determined by the ADC0 MUX resistance, the ADC0 sampling capacitance, any external source resis-
tance, and the accuracy required for the conversion. Figure 5.4 shows the equivalent ADC0 input circuits
for both Differential and Single-ended modes. Notice that the equivalent time constant for both input cir-
cuits is the same. The required settling time for a given settling accuracy (SA) may be approximated by
Equation 5.1. When measuring the Temperature Sensor output, RTOTAL reduces to RMUX. An absolute
minimum settling time of 1.5 µs is required after any MUX or PGA selection. Note that in low-power track-
ing mode, three SAR clocks are used for tracking at the start of every conversion. For most applications,
these three SAR clocks will meet the tracking requirements.
Equation 5.1. ADC0 Settling Time Requirements
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
RTOTAL is the sum of the ADC0 MUX resistance and any external source resistance.
n
is the ADC resolution in bits (12).
Figure 5.4. ADC0 Equivalent Input Circuits
t
2
n
SA
-------


R
TOTALCSAMPLE
ln
=
R
MUX = 5k
RC
Input= RMUX * CSAMPLE
R
MUX = 5k
C
SAMPLE = 10pF
C
SAMPLE = 10pF
MUX Select
MUX Select
Differential Mode
AIN0.x
AIN0.y
R
MUX = 5k
C
SAMPLE = 10pF
RC
Input= RMUX * CSAMPLE
MUX Select
Single-Ended Mode
AIN0.x


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