TS4998 datasheet(22/33 Pages) STMICROELECTRONICS

Part #	TS4998

Description	2 x 1W differential input stereo audio amplifier

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

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Application information

TS4998

22/33

4.5

Low frequency response

The input coupling capacitors block the DC part of the input signal at the amplifier inputs. In

the low frequency region, CIN starts to have an effect. CIN and RIN form a first-order high

pass filter with a -3dB cut-off frequency.

with RIN expressed in Ω and CIN expressed in F.

So, for a desired -3dB cut-off frequency we can calculate CIN:

From Figure 64, you can easily establish the CIN value required for a -3 dB cut-off frequency

for some typical cases.

Figure 64.

-3dB lower cut-off frequency vs. input capacitance

π R

----------------------------------------------- Hz

()

π R

------------------------------------------------ F

()

0.2

0.4

0.6

0.8

100

Rin=24k

G~6dB

Rin=12k

G~12dB

Rin=6.2k

G~18dB

Tamb=25

°C

Input Capacitor Cin (

μF)

0.1

TS4998 Datasheet(PDF) 22 Page - STMicroelectronics