tc9404fng TOSHIBA Semiconductor CORPORATION, tc9404fng Datasheet - Page 8

• Manufacturer Part Number: tc9404fng
• Description: Modulation System Da Converter With Analog Filter
• Manufacturer: TOSHIBA Semiconductor CORPORATION

7. Soft Mute Circuit
8. Common left Channel/Right Channel Digital Zero Data Detection Output Circuit
9. Description of Internal Control Signals
9-1
output by switching the SM pin (pin 18) from the “L” level to the “H” level when in the parallel mode (
= “H”). The soft mute’s ON/OFF function and the DA converter output are shown in Figure 9.
The Soft mute ON/OFF control function is disabled during level transition.
and the ZD pin (pin 11) is switched from “L” to “H” when data for both the left channel and the right
channel becomes zero data for approximately 350 ms or longer.
the serial mode (
The IC is equipped with a soft mute function, and this enables a soft mute to be set for the DA converter
The IC is equipped with a common left channel/right channel digital zero data detection output circuit,
This is fixed at “L” when the data for the left channel and right channel is not zero data.
The
Parallel Mode (
mode.
Figure 9 Changes in The Soft Mute DA Converter Output Level
P/
Pins 18, 19 and 20 are used as the mode setting pins shown in the table below when in the parallel
S
pin can be used to switch between the parallel mode (
Pin No.
18
19
20
P/
S
Table 3 Pin Names at the Parallel Mode
pin = “L” with the microcontroller interface function).
P/
Pin Name
S
EMP
SM
BS
= “H”: DC setting mode)
De-emphasis filter mode select pin
De-emphasis filter control pin
Soft mute control pin
8
Function
P/
S
pin = “H” in DC setting mode) and
TC9404FNG
2006-04-27
P/
S