LC87F2708A Datasheet, PDF (14/21 Pages) Sanyo Semicon Device – CMOS IC FROM 8K byte, RAM 512 byte on-chip 8-bit 1-chip Microcontroller

LC87F2708A
AD Converter Characteristics at VSS1 = 0V
<12-bits AD Converter Mode/Ta = -40°C to +85°C >
Parameter
Symbol
Pin/Remarks
Resolution
Absolute
accuracy
Conversion time
N
ET
tCAD
AN0(P10) to
AN6(P16)
Analog input
voltage range
Analog port
input current
VAIN
IAINH
IAINL
Conditions
(Note 7-1)
• See Conversion time calculation
method
• (Note 7-2)
VAIN=VDD
VAIN=VSS
VDD[V]
3.0 to 5.5
3.0 to 5.5
4.0 to 5.5
3.0 to 5.5
3.0 to 5.5
3.0 to 5.5
3.0 to 5.5
min
38
75.8
VSS
-1
Specification
typ
max
unit
12
bit
±16 LSB
104.3
μs
104.3
VDD
V
1
μA
<8-bits AD Converter Mode/Ta = -40°C to +85°C >
Parameter
Symbol
Resolution
Absolute
accuracy
Conversion time
N
ET
tCAD
Pin/Remarks
AN0(P10) to
AN6(P16)
Analog input
voltage range
Analog port
input current
VAIN
IAINH
IAINL
Conditions
(Note 7-1)
• See Conversion time calculation
method.
• (Note 7-2)
VAIN=VDD
VAIN=VSS
VDD[V]
3.0 to 5.5
3.0 to 5.5
4.0 to 5.5
3.0 to 5.5
3.0 to 5.5
3.0 to 5.5
3.0 to 5.5
min
23.4
46.7
VSS
-1
Specification
typ
max
unit
8
bit
±1.5 LSB
64.3
μs
64.3
VDD
V
1
μA
Conversion time calculation formulas:
12-bits AD Converter Mode: tCAD(Conversion time) = ((52/(AD division ratio))+2)×(1/3)×tCYC
8-bits AD Converter Mode: tCAD(Conversion time) = ((32/(AD 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-bits AD
8-bits AD
40MHz/20MHz
4.0V to 5.5V
3.0V to 5.5V
1/1
300ns
1/8
41.8μs
25.8μs
1/1
300ns
1/16
83.4μs
51.4μs
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 2 times the normal-time conversion time when:
• The first AD conversion is performed in the 12-bit AD conversion mode after a system reset.
• The first AD conversion is performed after the AD conversion mode is switched from 8-bit to 12-bit
conversion mode.
No.A1335-14/21