TS4998 STMicroelectronics, TS4998 Datasheet - Page 22

• Manufacturer Part Number: TS4998
• Description: 2 X 1w Differential Input Stereo Audio Amplifier
• Manufacturer: STMicroelectronics

Application information
4.5
22/33
Low frequency response
The input coupling capacitors block the DC part of the input signal at the amplifier inputs. In
the low frequency region, C
pass filter with a -3dB cut-off frequency.
with R
So, for a desired -3dB cut-off frequency we can calculate C
From
for some typical cases.
Figure 64. -3dB lower cut-off frequency vs. input capacitance
Figure
IN
expressed in Ω and C
64, you can easily establish the C
100
10
0.1
IN
Rin=12k
G~12dB
starts to have an effect. C
IN
F
expressed in F.
C
CL
IN
Ω
=
=
0.2
Input Capacitor Cin (
---------------------------------------------- - Hz
2
----------------------------------------------- - F ( )
2
Rin=24k
G~6dB
×
×
π
π
×
×
R
IN
1
R
1
IN
Ω
IN
value required for a -3 dB cut-off frequency
×
×
C
0.4
F
IN
CL
(
IN
Rin=6.2k
G~18dB
μ
F)
and R
)
IN
0.6
:
Tamb=25
IN
Ω
form a first-order high
0.8
°
C
1
TS4998