參數(shù)資料
型號(hào): YMU757
元件分類: 音頻合成
英文描述: TONE/MUSIC SYNTHESIZER, PDSO20
封裝: TSSOP-20
文件頁數(shù): 25/42頁
文件大小: 701K
代理商: YMU757
YMU757
#
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31-
Sound quality correction circuit
Itispossible to correctthe sound quality and gain by using an externalcircuitconnected to EQ 1 to 3 terminals.
A circuitstructure ofEQ 1 to 3 terminalinside and exam ple ofexternalcircuitare asfollow s.
Gain and filtercharacteristic are adjusted by value ofC1,C2,R1 and R2.
Gain = R2 /R1. Recom m endation ofR1 is22k
and R2 is82k (gain = 3.7 times).
Cutofffrequency f1 and f2 offilterisasfollow s.
I4 42#+5×R1×C1).
I5 42#+5×R2×C2).
Recom m endation ofeach value are asfollow s.
IfC1=0.022F and C2=120pF,cutofffrequency f1=330H z and f2=16kH z.
Moreover,the circuitenclosed with the dotted line becom es necessary w hen an analog signalis inputted from A IN and it
wantsto mix it.
The leveladjustmentthatitismixed dependson the resistance ratio R2/Rx ofRx and R2.
7KH#YDOXH#RI#5[#ZKHQ#LW#ZDQWV#WR#PL[#LW#LQ#WKH#DPSOLWXGH#RI#RQH#WLPH#RI#$,1#LV#;5N-1
f1
f2
Gain1
Gain1 -3dB
Gain
Freq
+
VREF
EQ 2
EQ 3
FM
VO L
EQ 1
R1
R2
C2
C1
Rx
C3
AIN
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