TS4994EIKJT STMICROELECTRONICS [STMicroelectronics], TS4994EIKJT Datasheet - Page 31

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TS4994EIKJT

Manufacturer Part Number
TS4994EIKJT
Description
1.2 W differential input/output audio power amplifier with selectable standby
Manufacturer
STMICROELECTRONICS [STMicroelectronics]
Datasheet
TS4994FC
4.10
Note:
4.11
4.12
Shutdown time
When the standby command is set, the time required to put the two output stages in high
impedance and the internal circuitry in shutdown mode is a few microseconds.
In shutdown mode, the Bypass pin and Vin+, Vin- pins are short-circuited to ground by
internal switches. This allows a quick discharge of the C
Pop performance
Due to its fully differential structure, the pop performance of the TS4994 is close to perfect.
However, due to mismatching between internal resistors R
capacitors C
components, the TS4994 includes pop reduction circuitry. With this circuitry, the TS4994 is
close to zero pop for all possible common applications.
In addition, when the TS4994 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 TS4994 in a single-ended input configuration. However, input
coupling capacitors are needed in this configuration. The schematic in
example of this configuration.
Figure 98. Single-ended input typical application
The component calculations remain the same, except for the gain. In single-ended input
configuration, the formula is:
GND
Ve
220nF
220nF
in
Cin1
Cin2
, some noise might remain at startup. To eliminate the effect of mismatched
Rin1
20k
Rin2
20k
+
GND
Cb
1u
3
1
8
GND
Av
Rfeed1
20k
Vin-
Vin+
Bypass
Mode
VCC
SE
9
GND
=
V
VCC
Stdby
4
O
+
Ve
V
O
2
VCC
GND
6
VCC
GND
Standby
-
+
=
Bias
R
R
feed
in
b
+
Rfeed2
20k
GND
and C
in
, R
Cs
1u
feed
in
TS4994IJ
capacitors.
, and external input
Application information
Vo+
Vo-
Figure 98
5
7
8 Ohms
shows an
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