NJW1191 데이터 시트보기 (PDF) - Japan Radio Corporation
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NJW1191 Datasheet PDF : 20 Pages
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NJW1191
!APPLICATION NOTES
< Loudness fc adjustment >
Loudness High and Low Boost cut off frequencies are able to adjust with the external parts as shown in fig.A.
They are given by the functions below.
Ce1
(C6, C21)
Re1
(R1, R8)
Re2
(R2, R7)
Ce2
(C7, C20)
TAP1
(7, 26pin)
TAP2
(8, 25pin)
MASTER VOLUME
& LOUDNESS
1
High Boost cut off frequency: fcH= 2πRe1 ⋅ Ce1 (Hz)
1
Low Boost cut off frequency: fcL= 2πRe2 ⋅ Ce2 (Hz)
<NOTE>
Re2 should be fixed to 4.7kΩ for the precise level of volume in
Loudness mode.
fig. A Loudness circuit
< Tone fc adjustment >
Tone High and Low cut off frequencies are able to adjust with the external parts as shown in fig.B. They are given
by the functions below. .
R3A
R3B
Ce3
(C8, C19)
R4A
(R3A+R3B= 33kΩ) R4B
THC
TLC
(9, 24pin) (10, 23pin)
Ce4
(C9, C18)
(R4A+R4B= 33kΩ)
DCC
(11, 22pin)
Ce5
(C10, C17)
Re3
(R3, R6)
(Boost)
1
Treble cut off frequency: fcT= 2πR3B ⋅ Ce3 (Hz)
(R3B=5.5kΩ at 14dB set)
Bass
cut
off
frequency:
fcBL=
2π
(R
(R4B + Re3 )
4A + R4B ) ⋅Re3
⋅
Ce4
(Hz)
1
DC cut off frequency: fcDC= 2π (R4B + Re3 ) ⋅ Ce5 (Hz)
(R4B=3.3kΩ at 14dB set)
R3A
R4A
R3B
Ce3
(C8, C19)
(R3A+R3B= 33kΩ) R4B
THC
TLC
(9, 24pin) (10, 23pin)
Ce4
(C9, C18)
Re3
(R3, R6)
(R4A+R4B= 33kΩ)
DCC
(11, 22pin)
Ce5
(C10, C17)
(Cut)
fig. B Tone circuit
–6–
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