ENA1335B Datasheet, PDF (16/24 Pages) ON Semiconductor – 8-bit Microcontroller

LC87F2708A
7. AD Converter Characteristics at VSS1=0V
< 12-bit AD conversion mode at Ta=40 to +85C >
Parameter
Symbol Pin/Remarks
Conditions
Resolution
Absolute accuracy
Conversion time
Analog input
voltage range
Analog port input
current
N
ET
tCAD
VAIN
IAINH
IAINL
AN0(P10)
to AN6(P16)
(Note7-1)
 See "Conversion time
calculation method."
 (Note7-2)
VAIN=VDD
VAIN=VSS
Specification
VDD[V] _min.
3.0 to 5.5
typ. max. unit
12
bit
3.0 to 5.5
16 LSB
4.0 to 5.5
38
104.3 s
3.0 to 5.5 75.8
104.3
3.0 to 5.5 VSS
VDD V
3.0 to 5.5
3.0 to 5.5
1
1
A
< 8-bit AD conversion mode at Ta=40 to +85C >
Parameter
Symbol Pin/Remarks
Conditions
Specification
VDD[V] min.
typ. max. unit
Resolution
N
Absolute accuracy ET
AN0(P10)
to AN6(P16) _(Note7-1)
3.0 to 5.5
3.0 to 5.5
8
bit
1.5 LSB
Conversion time tCAD
Analog input
voltage range
Analog port input
current
VAIN
IAINH
IAINL
 See "Conversion time
calculation method."
 (Note7-2)
VAIN=VDD
VAIN=VSS
4.0 to 5.5 23.4
3.0 to 5.5 46.7
3.0 to 5.5 VSS
3.0 to 5.5
3.0 to 5.5
1
64.3 s
64.3
VDD V
1
A
< Conversion time calculation method >
12-bit AD conversion mode: tCAD (conversion time) = ((52/(division ratio)) + 2) (1/3) tCYC
8-bit AD conversion mode: tCAD (conversion time) = ((32/(division ratio)) + 2) (1/3) tCYC
< Recommended Operating Conditions >
High-speed RC
Oscillation
(FmHRC)
Supply Voltage
Range
(VDD)
System Clock
Division Ratio
(SYSDIV)
Cycle Time
(tCYC)
AD Division
Ratio
(ADDIV)
Conversion Time (tCAD)
12-bit AD
8-bit AD
4.0V to 5.5V
1/1
40MHz/20MHz
3.0V to 5.5V
1/1
300ns
300ns
1/8
41.8s
25.8s
1/16
83.4s
51.4s
Note 7-1: The quantization error (±1/2LSB) is excluded from the absolute accuracy. The absolute accuracy is measured
when no change occurs in the I/O state of the pins that are adjacent to the analog input channel during AD
conversion processing.
Note 7-2: The conversion time refers to the interval from the time a conversion starting instruction is issued till the time
the complete digital conversion value against the analog input value is loaded in the result register.
* The conversion time is twice the normal value when one of the following conditions occurs:
-The first AD conversion executed in the 12-bit AD conversion mode after a system reset.
-The first AD conversion executed after the AD conversion mode is switched from 8-bit to 12-bit AD conversion
mode.
No.A1335-16/24