TS489 STMicroelectronics, TS489 Datasheet - Page 24

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TS489

Manufacturer Part Number
TS489
Description
Pop-free 120mW stereo headphone amplifier
Manufacturer
STMicroelectronics
Datasheet

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Application information
4.4
24/32
Note:
Higher cut-off frequency
In the high frequency region, you can limit the bandwidth by adding a capacitor C
parallel with R
that F
C
Figure 79. Lower cut-off frequency vs.
Figure 81. Higher cut-off frequency vs. feedback capacitor
feed
100
10k
1k
10
CH
is:
1
is highest frequency to be amplified (with a 3dB attenuation), the maximum value of
In case F
1st order high-pass filter on the input and the 1st order high-pass filter on the
output create a 2nd order high-pass filter in the audio signal path with an
attenuation 6dB on F
input capacitor
feed
. It forms a low-pass filter with a -3dB cut-off frequency F
10
CL
Rin=10k
is kept the same for calculation, It must be taken in account that the
Cin (nF)
Ω
100k
Rin=20k
10k
100
1k
0.01
100
CL
Rin=50k
Ω
Rfeed=40k
F
and a roll-off 40db
CH
Rin=100k
Ω
=
0.1
Rfeed=80k
Ω
--------------------------------------------------
Ω
1000
R
Cfeed
Ω
Figure 80. Lower cut-off frequency vs.
feed
1
1
100
10k
1k
10
(
μ
0.1
F
)
Rfeed=10k
C
decade.
feed
Rfeed=20k
10
output capacitor
Ω
1
Ω
100
Cout (
10
R
L
μ
=16
F)
CH
Ω
R
L
=32
. Assuming
TS488-TS489
Ω
100
feed
R
L
=600
in
Ω
1000

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