[CQ-2063]
MS1262-E-05 2013/06
- 9 -
Application Circuits
6
5
4
I
N
3
2
1
7
0.1
F
+5V
R1
R1
R2
R2
VOUT
SCLK
P
DATA_IO
VDD
VSS
AIN
VSS
VREF
R
F
C
F
N
A/D
(a) 0.1F bypass capacitor should be placed near by the CQ-2063
(b) Ratiometric output of CQ-2063 enables an A/D system to improve the A/D conversion error caused by the fluctuation
of supply voltage. This is achieved by making the supply voltage of CQ-2063 and the reference voltage of A/D
converter common.
Voltage dividers (R1 and R2) are required if the reference voltage of A/D converter is less than +5V.
For example, if the reference voltage of A/D converter is +3.3V which is its supply voltage level, R1=20kΩ , R2=39kΩ
are recommended. If the reference voltage of A/D converter is different from its supply voltage level, one more
voltage divider is required.
(c) Add a low-pass filter if it is necessary.
Figure 11. Recommended circuits when using A/D converter
CQ-2063
(b)
(c)
(a)
