TS488IST datasheet(27/32 Pages) STMICROELECTRONICS

Il numero della parte	TS488IST

Spiegazioni elettronici	Pop-free 120mW stereo headphone amplifier

PDF	32 Pages

Scroll/Zoom	100%

Produttore elettronici	STMICROELECTRONICS [STMicroelectronics]

Homepage	http://www.st.com

Logo

27 / 32 page

TS488-TS489

Application information

27/32

With the values above, the result is FCL=25Hz.

In this case,

τ in = Rin xCin=6.6ms.

This value is sufficient with regard to the previous formula, thus we can state that the pop is

imperceptible.

Connecting the headphones

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 Cout to be charged even when the

headphones are not plugged in.

Pulldown resistors with a value of 1 k

Ω are high enough to be a negligible load, and low

enough to charge the capacitors Cout in less than one second.

Note:

The pop&click reduction circuitry works properly only when both channels have the same

value for the external components Cin, Cout, Rload and Rpulldown.

TS488IST Scheda tecnica(PDF) 27 Page - STMicroelectronics