TS4990EKIJT STMICROELECTRONICS [STMicroelectronics], TS4990EKIJT Datasheet - Page 23

• Manufacturer Part Number: TS4990EKIJT
• Description: 1.2 W audio power amplifier with active low standby mode
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

TS4990
Note:
Figure 64. Differential input amplifier configuration
The input capacitor C
frequency required. (F
This formula is true only if:
is 5 times lower than F
Example bill of materials
The bill of materials in
and a -3 dB lower cut-off frequency of about 80 Hz.
Table 7.
Neg. Input
Pos. Input
Pin name
C
b
F
C
U1
R
R
=C
Bill of materials for differential input amplifier application
CB
in
Standby
Control
1
2
Cin
Cin
s
=
----------------------------------------
2π R
R1
R1
(
in
L
L
Table 7
R2
Cb
1
can be calculated by the following formula using the -3 dB lower
.
is the lower frequency required).
+
1
R
2
)C
is for the example of a differential amplifier with a gain of 2
B
Vin-
Vin+
Bypass
Standby
R2
C
(Hz)
in
≈
-
+
-------------------- -
2πR
Bias
1
1
F
L
Functional description
Vcc
(F)
20k / 1%
20k / 1%
TS4990
100nF
1µF
-
+
AV = -1
Application information
TS4990
Vout 1
Vout 2
Speaker
8 Ohms
23/32
Cs