tc9470fn TOSHIBA Semiconductor CORPORATION, tc9470fn Datasheet - Page 11

• Manufacturer Part Number: tc9470fn
• Description: Modulation Da Converter With Built-in 8-times Oversampling Digital Filter/dynamic Digital Bass Boost/analog Filter
• Manufacturer: TOSHIBA Semiconductor CORPORATION

8. Soft Mute Circuit
9. Common Left Channel/Right Channel Digital Zero Data Detection Output Circuit
10. Description of Internal Control Signals
10.1 Parallel Mode (
output by switching the SM pin (pin 8) from the “L” level to the “H” level when in the parallel mode
(
and the ZD pin (pin ) 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 (
P/
The IC is equipped with a soft mute function, and this enables a soft mute to be set for the DA converter
The Soft mute ON/OFF control function is disabled during level transition.
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
SM Pin Input
DA Converter
Output Level
S
parallel mode.
Figure 12 Changes in the Soft Mute DA Converter Output Level
= “H”). The soft mute’s ON/OFF function and the DA converter output are shown in Figure 2.
P/
Pins 8, 9, 20 and 2 are used as the mode setting pins shown in the table below when in the
S
pin can be used to switch between the parallel mode (
Pin No.
Off
P/
18
19
20
21
S
pin = “L” with the microcontroller interface function).
Table 6 Pin Names at the Parallel Mode
P/
Approximately 23 ms
S
Pin Name
= “H”: DC setting mode)
DBB1
DBB2
EMP
SM
64
1
Soft mute control pin
De-emphasis control pin
Digital bass boost mode control pin 1
Digital bass boost mode control pin 2
On
11
Pin Description
P/
S
pin = “H” in DC setting mode) and
Approximately 23 ms
64
Off
1
TC9470FN
2002-02-27