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TS4909IQT Datasheet(PDF) 23 Page - STMicroelectronics

No. de pieza TS4909IQT
Descripción Electrónicos  Dual mode low power 150 mW stereo headphone amplifier with capacitor-less and single-ended outputs
PDF  35 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

TS4909IQT Datasheet(HTML) 23 Page - STMicroelectronics

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TS4909
Application information
Doc ID 11972 Rev 9
23/35
4
Application information
4.1
General description
The TS4909 integrates two monolithic power amplifiers. The amplifier output can be
configured to provide either single-ended (SE) capacitively-coupled output or phantom
ground (PHG) capacitor-less output.
Figure 1: Typical applications for the TS4909 on
page 5 shows schematics for each of these configurations.
Single-ended configuration
In the single-ended configuration, an output coupling capacitor, C
out
, on the output of the
power amplifier (V
out1
and V
out2
) is mandatory. The output of the power amplifier is biased to
a DC voltage equal to V
CC
/2 and the output coupling capacitor blocks this reference voltage.
Phantom ground configuration
In the phantom ground configuration, an internal buffer (V
out3
) maintains the V
CC
/2 voltage
and the output of the power amplifiers are also biased to the V
CC
/2 voltage. Therefore, no
output coupling capacitors are needed. This is of primary importance in portable
applications where space constraints are continually present.
4.2
Frequency response
Higher cut-off frequency
In the high frequency region, you can limit the bandwidth by adding a capacitor C
feed
in
parallel with R
feed
. It forms a low-pass filter with a -3 dB cut-off frequency F
CH
. Assuming
that F
CH
is the highest frequency to be amplified (with a 3 dB attenuation), the maximum
value of C
feed
is:
Figure 77. Higher cut-off frequency vs. feedback capacitor
F
CH
1
2
π R
f eed
C
f eed
⋅⋅
---------------------------------------------
=
0.01
0.1
1
10
100
100
1k
10k
100k
R feed= 40 k
Ω
R feed= 80k
Ω
R feed= 20k
Ω
Cfeed (μF)
R feed= 10k
Ω



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