YAC526 Datasheet, PDF (9/14 Pages) YAMAHA CORPORATION – Electric Variable Resistance 3

YAC526
■Example of system configuration
When there is a fear that voltage exceeding the maximum rating is applied to the analog input pins (IN1 and IN2)
of YAC526, 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
YAC526 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, IN2
AVSS
5V
Since SDATAO is an
open drain output
Digital Controller
pin, connect it to the
power supply of the
VDD
VSS
destination device
connected through a
resistor.
SDATAI of
YAC526
YAC523/
YAC526
1 _ZCEN1
IN1 ²⁴
2 _ZCEN2
REF1A ²³
3 _CSN
REF1B ²²
4 _SDATAI
OUT1 ²¹
5 _DGND
AVDD ²⁰
6 _REF
AVSS ¹⁹
-6V
-6V
7 _DVSS
AVSS ¹⁸
8 _SCLK
AVDD ¹⁷
+6V
9 _SDATAO
OUT2 ¹⁶
10 _TE1
REF2B ¹⁵
11 _TE2
REF2A ¹⁴
12 _TE3
IN2 ¹³
Digital ground
Analog ground
9