TS4998 STMicroelectronics, TS4998 Datasheet - Page 27

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

TS4998
4.12
external input capacitors C
mismatched components, the TS4998 includes pop reduction circuitry. With this circuitry,
the TS4998 is close to zero pop for all possible common applications.
In addition, when the TS4998 is in standby mode, due to the high impedance output stage in
this configuration, no pop is heard.
Single-ended input configuration
It is possible to use the TS4998 in a single-ended input configuration. However, input
coupling capacitors are needed in this configuration. The schematic diagram in
shows an example of this configuration for a gain of +6dB set by the input resistors.
Figure 67. Typical single-ended input application
The component calculations remain the same for the gain. In single-ended input
configuration, the formula is:
with R
IN
Diff. input L-
Diff. input R-
expressed in kΩ .
P1
P2
Cin1
330nF
Cin2
330nF
Cin3
330nF
Cin4
330nF
Rin1
25k
Rin2
25k
Rin3
25k
Rin4
25k
IN
, some noise might remain at startup. To eliminate the effect of
Av
1uF
Cb
14
1
2
4
3
U1
SE
TS4998
LIN-
LIN+
RIN-
RIN+
Bypass
=
V
------------------------- -
RIGHT
O+
LEFT
GND
V
–
e
BIAS
V
O-
GND
=
R
------------- -
R
feed
IN
STBY
=
-
+
-
+
50kΩ
------------- -
R
TS4998 - QFN16
IN
VCC
Vcc
LOUT-
LOUT+
ROUT-
ROUT+
Application information
Cs
1uF
12
11
9
10
Left Speaker
Right Speaker
8 Ohms
8 Ohms
Figure 67
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