AS3515_08 datasheet(25/67 Pages) AMSCO

номер детали	AS3515

подробное описание детали	Stereo Audio Codec with System Power Management

PDF	67 Pages

Scroll/Zoom	100%

производитель	AMSCO [ams AG]

домашняя страница	http://www.ams.com

Logo

25 / 67 page

AS3515 V15

austriamicrosystems

Data Sheet, Confidential

www.austriamicrosystems.com

Revision 3.1

- 66

6.7

Audio Output Mixer

6.7.1

General

The mixer stage sums up the audio signals of the following stages

•

Microphone Input 1

•

Microphone Input 2

•

Line Input 1

•

Line Input 2

•

Digital Audio Input (DAC)

The mixing ratios have to be with the volume registers of the corresponding input stages. Please be sure that the input signals of the

mixer stage are not higher than 1Vp. If summing up several signals, each has of course to be lower.

This shall insure that the output signal is also not higher than 1Vp to get a proper signal for the output amplifier. This stage has an

automatic gain control, which automatically avoids clipping.

6.7.2

AGC

The audio mixer includes an AGC, which is limiting the signal to 1Vp. The AGC has 12 steps with a dynamic range of about 18dB. The

AGC is ON by default but can be disabled by a register bit.

6.7.3

The mixer stage has no direct associated registers.

Enabling the Summing / Mixer stage is done via a control bit in the audio settings register (AudioSet1 register 0x14h). Disabling the AGC

is done via AudioSet2 register (0x15h).

AS3515 датащи(PDF) 25 Page - ams AG