TS489 STMicroelectronics, TS489 Datasheet - Page 27

• Manufacturer Part Number: TS489
• Description: Pop-free 120mW stereo headphone amplifier
• Manufacturer: STMicroelectronics

TS488-TS489
Connecting the headphones
Note:
With the values above, the result is F
In this case, τ
This value is sufficient with regard to the previous formula, thus we can state that the pop is
imperceptible.
Generally headphones are connected using jack connectors. To prevent a pop in the
headphones when plugging in the jack, a pulldown resistor should be connected in parallel
with each headphone output. This allows the capacitors C
headphones are not plugged in.
Pulldown resistors with a value of 1 kΩ are high enough to be a negligible load, and low
enough to charge the capacitors C
The pop&click reduction circuitry works properly only when both channels have the same
value for the external components C
in
= R
in
x C
in
=6.6ms.
out
in
CL
, C
in less than one second.
=25Hz.
out
, R
load
and R
pulldown
out
to be charged even when the
.
Application information
27/32