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TS4909 Datasheet(PDF) 29 Page - STMicroelectronics

No. de pieza TS4909
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

TS4909 Datasheet(HTML) 29 Page - STMicroelectronics

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TS4909
Application information
Doc ID 11972 Rev 9
29/35
Sample calculation
With R
in
=20k
Ω and F
CL
= 20 Hz and a -3 db low cut-off frequency, C
in
=398 nF.
Therefore, C
in
= 390 nF with standard values which gives a lower cut-off frequency equal to
20.4 Hz.
In this case:
τ
in =
R
in
xC
in
=7.8 ms
This value is sufficient with regard to the previous formula, so we can state that the pop will
be imperceptible.
Connecting the headphones
In general, the headphones are connected using a jack connector. To prevent pop in the
headphones while plugging in the jack, a pulldown resistor should be connected in parallel
with each headphone output. This allows the capacitors C
out
to be charged even when no
headphones are plugged in.
A resistor of 1 k
Ω is high enough to be a negligible load, and low enough to charge the
capacitors C
out
in less than one second.
4.8
Standby mode
When the TS4909 is in standby mode, the time required to put the output stages
(V
out1
, V
out2
and V
out3
) into a high impedance state with reference to ground, and the
internal circuitry in standby mode, is a few microseconds.
Figure 83. Internal equivalent circuit schematics of the TS4909 in standby mode
25K
25K
1M
1M
Vin1
BYPASS
Vin2
Vout1
Vout2
GND
Vout3



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