CXD3003 datasheet(100/137 Pages) SONY

100 / 137 page

– 100 –

CXD3003R

AGCNTL and default operation have two stages.

In the first stage, rough adjustment is performed with high sensitivity for a certain period of time (select

256/128ms with AGHT, when MCK = 128Fs), and the AGCNTL coefficient approaches the appropriate value.

The sensitivity at this time can be selected from two types with AGV1.

In the second stage, the AGCNTL coefficient is finely adjusted to approach more appropriate value with

relatively low sensitivity. The sensitivity for the second stage can be selected from two types with AGV2. In the

second stage of default operation, when the AGCNTL coefficient reaches the appropriate value and stops

changing, the CXD3003R confirms that the AGCNTL coefficient has not changed for a certain period of time

(select 63/31ms with AGHJ, when MCK = 128Fs), and then completes AGCNTL operation. (Self-stop mode)

This self-stop mode can be canceled by setting AGS to 0.

In addition, the first stage is omitted for AGCNTL operation when AGHS is set to 0.

An example of AGCNTL coefficient transitions during AGCNTL in various settings are shown in Fig. 5-5.

Initial value

SENS

AGCNTL

Start

AGCNTL

completion

Convergence value

AGCNTL

coefficient value

Slope AGV1

AGHT

AGJ

Slope AGV2

Fig. 5-5.

CXD3003 데이터시트(PDF) 100 Page - Sony Corporation