ST92F124/F150/F250 - ELECTRICAL CHARACTERISTICS
10-BIT ADC CHARACTERISTICS
Subject to general operating conditions for VDD, fOSC, and TA, unless otherwise specified.
Symbol
Parameter
Conditions
Min
Typ 1)
Max
fADC
VAIN
VAINx
RAIN
CADC
RADC
tSTAB
tADC
ADC clock frequency
Conversion range voltage (2)
Analog Input Voltage
External source impedance
Internal sample and hold capacitor
Analog input pin impedance
Stabilization time after ADC enable
Conversion time (Sample+Hold)
- Sample capacitor loading time
- Hold conversion time
fADC = 4 MHz
1
AVSS
-0.2
7
6 (3,4)
4
AVDD
AVDD +0.2
10 (3)
1.7
10
8
20
IVDDA VDDA input current
1 (4)
Unit
MHz
V
kΩ
pF
kΩ
µs
1/fADC
mA
Figure 161. Typical Application with ADC
VDD
VAIN
RAIN
VDD
0.1µF
AINx
AVDD
CIO
~2pF
AVSS
ILKADC
±1µA
ADC
Notes:
1. Unless otherwise specified, typical data is based on TA=25°C and VDD-VSS=5V. These values are given only as design
guidelines and are not tested.
2. VAIN may exceed AVSS or AVDD. However the conversion result in these cases will be 0000h or FFC0h respectively.
3. Any external serial impedance will downgrade the ADC accuracy (especially for resistance greater than 10 kΩ). Data
based on characterization results, not tested in production.
4. Value guaranteed by design.
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