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參數(shù)資料
| 型號(hào)： | TC9470FN |
| 廠商： | Toshiba Corporation |
| 英文描述： | ?-? Modulation DA Converter with Built-in 8-Times Oversampling Digital Filter/Dynamic Digital Bass Boost/Analog Filter |
| 中文描述： | ？ - ？調(diào)制DA轉(zhuǎn)換器與內(nèi)置8時(shí)報(bào)采樣數(shù)字濾波器/動(dòng)態(tài)低音增強(qiáng)數(shù)字/模擬濾波器 |
| 文件頁數(shù)： | 11/20頁 |
| 文件大小： | 264K |
| 代理商： | TC9470FN |
TC9470FN
2002-02-27
11
8. Soft Mute Circuit
The IC is equipped with a soft mute function, and this enables a soft mute to be set for the DA converter
output by switching the SM pin (pin
1
8) from the “L” level to the “H” level when in the parallel mode
(
S
P/
= “H”). The soft mute’s ON/OFF function and the DA converter output are shown in Figure
1
2.
The Soft mute ON/OFF control function is disabled during level transition.
9. Common Left Channel/Right Channel Digital Zero Data Detection Output Circuit
The IC is equipped with a common left channel/right channel digital zero data detection output circuit,
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.
This is fixed at “L” when the data for the left channel and right channel is not zero data.
10. Description of Internal Control Signals
The
the serial mode (
S
P/
pin can be used to switch between the parallel mode (
S
P/
pin = “L” with the microcontroller interface function).
S
P/
pin = “H” in DC setting mode) and
10.1 Parallel Mode (
S
P/
= “H”: DC setting mode)
Pins
1
8,
1
9, 20 and 2
1
are used as the mode setting pins shown in the table below when in the
parallel mode.
Table 6 Pin Names at the Parallel Mode
Pin No.
Pin Name
Pin Description
18
SM
Soft mute control pin
19
EMP
De-emphasis control pin
20
DBB1
Digital bass boost mode control pin 1
21
DBB2
Digital bass boost mode control pin 2
SM Pin Input
DA Converter
Output Level
Approximately 23 ms
Off
On
Off
Approximately 23 ms
64
1
64
1
Figure 12 Changes in the Soft Mute DA Converter Output Level
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