TS2012EI datasheet(22/32 Pages) STMICROELECTRONICS

Part #	TS2012EI

Description	Filter-free Flip Chip stereo 2 x 2.5 W class D audio power amplifier

PDF	32 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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22 / 32 page

Application information

TS2012EI

22/32

DocID026152 Rev 1

4.4

Low frequency response

If a low frequency bandwidth limitation is required, it is possible to use input coupling

capacitors. In the low-frequency region, the input coupling capacitor Cin starts to have an

effect. Cin forms, with the input impedance Zin, a first order high-pass filter with a -3 dB cut-

off frequency (see Table 6 to Table 8).

So, for a desired cut-off frequency FCL, Cin is calculated as follows.

with FCL in Hz, Zin in  and Cin in F.

The input impedance Zin is for the whole power supply voltage range and it changes with the

gain setting. There is also a tolerance around the typical values (see Table 6 to Table 8).

Figure 36. Cut-off frequency vs. input capacitor

 Z





------------------------------------

 Z





--------------------------------------

0.1

100

G=24dB

Zin=7.5k typ.

G=18dB

Zin=15k typ.

G=6dB, G=12dB

Zin=30k typ.

Tamb=25C

Input Capacitor Cin (F)

TS2012EI Datasheet(PDF) 22 Page - STMicroelectronics