CXD3018Q/R
AGCNTL default operation has 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 with relatively low sensitivity to further approach
the appropriate value. 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 CXD3018Q/R 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 operation with various settings is shown in
Fig. 5-5.
Initial value
Slope AGV1
AGCNTL coefficient value
Slope AGV2
Convergence value
AGHT
AGJ
AGCNTL
Start
AGCNTL
completion
SENS
Fig. 5-5
Note) Fig. 5-5 shows the case where the AGCCNTL coefficient converges from the initial value to a smaller
value.
– 92 –
ETC [ ETC ]
