cxd2548r Sony Electronics, cxd2548r Datasheet - Page 81

• Manufacturer Part Number: cxd2548r
• Description: Cd Digital Signal Processor With Built-in Digital Servo And Dac
• Manufacturer: Sony Electronics

AGCNTL and default operation have two stages.
In the first stage, high sensitivity adjustment is performed for a certain period of time (select 256/128ms with
AGHT), and the AGCNTL coefficient approaches the appropriate value roughly. The sensitivity at this time can
be selected from two types with AGV1.
In the second stage, the AGCNTL coefficient approaches the appropriate value finely 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
CXD2548R confirms that the AGCNTL coefficient has not changed for a certain period of time (select 63/31ms
with AGHJ), 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 and the relationship between the
various settings are shown in Fig. 4-3.
AGCNTL
coefficient value
Initial value
SENS
AGCNTL
Start
AGHT
Fig. 4-3.
Slope AGV1
– 81 –
Slope AGV2
AGJ
AGCNTL
completion
Convergence value
CXD2548R