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參數(shù)資料
| 型號： | TC9470FN |
| 元件分類： | DAC |
| 英文描述： | SERIAL, PARALLEL, WORD INPUT LOADING, 1-BIT DAC, PDSO24 |
| 封裝： | 0.300 INCH, 0.65 MM PITCH, PLASTIC, SSOP-24 |
| 文件頁數(shù)： | 3/19頁 |
| 文件大?。?/td> | 377K |
| 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 18) 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 12.
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
S
P/
pin can be used to switch between the parallel mode ( S
P/
pin = “H” in DC setting mode) and
the serial mode ( S
P/
pin = “L” with the microcontroller interface function).
10.1 Parallel Mode (
S
P/
= “H”: DC setting mode)
Pins 18, 19, 20 and 21 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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