STA321 datasheet(57/157 Pages) STMICROELECTRONICS

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STA321 Scheda tecnica(PDF) 57 Page - STMicroelectronics

Il numero della parte	STA321

Spiegazioni elettronici	4-channel digital audio system with FFX??driver

PDF	157 Pages

Scroll/Zoom	100%

Produttore elettronici	STMICROELECTRONICS [STMicroelectronics]

Homepage	http://www.st.com

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57 / 157 page

STA321

FFX

Doc ID 15351 Rev 3

57/157

7.6

Headphone modulation

The FFX modulator can be used for driving a headphone load with the common terminal

available, together with left and right terminals.

In this case it is possible to drive the common terminal with a 50% fixed duty cycle square

wave coming from output B of the modulator, by setting bit HALFB_n to 1, and the left and

right terminals from the output A of two different channels. For the three outputs used in this

way bits PM_nA and PM_nB can be 00 or 01.

Figure 34.

Modulation for headphones

Left

Right

Common

Output 0B

Output 0A

Output 1A

Common

Left

Right

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