YAC523 Datasheet, PDF (13/16 Pages) YAMAHA CORPORATION – Electric Variable Resistance 2

YAC523
■Example of system configuration
When there is a fear that voltage exceeding the maximum rating is applied to the analog input pins (IN1 to IN7) of
YAC523, connect diodes between AVDD and AVSS as shown below to prevent application of voltage exceeding
the maximum rating to the input pins.
Please make an analog domain and a digital domain into the ground side separated, respectively, and arrange
YAC523 to an analog domain and the impedance to an AVSS pin should become small as much as possible.
And please secure an area large enough, and a radiation noise should fully be stopped and an analog ground and
a digital ground also make it.
Control signals, such as serial interface, should wire a digital ground side collectively. In order to prevent
interference with a control signal and an analog signal, be careful for an analog signal and a digital signal not to
cross or not to adjoin.
Analog input terminal protection
AVDD
IN1〜IN7
AVSS
VDD(<AVDD)
Since SDATAO is an open drain
output pin, connect it to the power
supply of the destination device
connected through a resistor.
SDATAI of YAC523
Digital Controller
VDD
VSS
4.7kΩ
-6V
100µF
10µF
0.1µF
+6V
100µF
0.1µF
0.1µF
2.2kΩ
2.2kΩ
2.2kΩ
2.2kΩ
2.2kΩ
2.2kΩ
2.2kΩ
10µF
10µF
10µF
10µF
10µF
10µF
10µF
0.1µF 0.1µF
1 _AVSS
2 _AVDD
3 _IN1
4 _IN2
5 _IN3
6 _IN4
7 _IN5
8 _IN6
9 _IN7
10 _AVDD
11 _AVSS
12 _REF7B
YAC523
0.1µF
NC ³⁶
NC ³⁵
OUT1 ³⁴
OUT2 ³³
OUT3 ³²
OUT4 ³¹
OUT5 ³⁰
OUT6 ²⁹
OUT7 ²⁸
NC ²⁷
10µF
10µF
10µF
10µF
10µF
10µF
10µF
NC ²⁶
REF1B ²⁵
10kΩ
10kΩ
10kΩ
10kΩ
10kΩ
10kΩ
10kΩ
13