M62301FP データシートの表示（PDF） - Renesas Electronics
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M62301FP Datasheet PDF : 12 Pages
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M62301SP/FP
2. 4-channel 12-bit A/D converter system
Separate power supplies to analog section and digital section, analog input voltage range mode wider up to VDD,
external reference voltage for integration.
To microcomputer
5 V power supply
10 k 10 k
1
2
To microcomputer
3
control pin
4
To counter
To RESET
5
6
CINT
680 pF
7
8
CI
6800 pF
9
50 µA
10
8V
20
A1 19
A2 18
A3 17
A4 16
15
VDD 14
13
Input analog
voltage
2.5 V
To microcomputer
CREF 4700 pF 5 V power supply
12
11
II = 50 µA
RI 24 k
Note:
CREF: To stabilize reference voltage, be sure to connect capacitance of approximately 4700 pF.
CINT: We suggest that this capacitance be connected to prevent malfunction due to noise.
Use CI that leaks as slight current as possible. To prevent leak to the circuit board, we recommend
providing guard ring (7), (9).
Because separate power supplies are provided for the analog are digital sections, the M62301 has two supply
voltage VCC and VDD, enabling a wide analog input voltage range VIA. The upper limit of the range is required to be
no more than the difference between VCC – 2.5 V as well as VDD, therefore, the analog input voltage range in this
application is 0 V to 5 V.
When the counter clock frequency is 8 MHz, resolution is;
6800 pF ×
(5 + 0.13)
50 µA
1
8M
≈ 212
An A/D converter system with resolution of approximately 12 bits can be formed.
REJ03D0861-0300 Rev.3.00 Mar 25, 2008
Page 7 of 11
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