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参数资料
| 型号： | TC9444F |
| 元件分类： | 消费家电 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP60 |
| 封装： | 14 X 14 MM, 0.80 MM PITCH, PLASTIC, QFP-60 |
| 文件页数： | 7/28页 |
| 文件大小： | 378K |
| 代理商： | TC9444F |
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TC9444F
2002-01-11
15
3.13 ATTA Command
Command to set the digital attenuator level by adding two-byte data.
When the lower 4 bits of the data are set to 2000H, the attenuator level is 0dB.
The upper two bits are the attenuator time constant selection bits. These bits select the soft mute
time constants.
When switching using the MUTE or KEYCON command, the value set by ATTA is also valid for the
automatic mute function.
Table 3.11
ATTA Command
CH
CL
D1
D0
B
0
DSA2
DSA1
ALA13
ALA12
ALA11
ALA10
ALA09
ALA08
ALA07
~
ALA00
Note 8: At a reset, the initial values are DSA
= 0H (23 ms) and ALA [13:00] = 2000H (0dB).
The following formula determines the data ALA [ 3:00] depending on the level (LEVEL [dB]) to be
set.
ALA [ 3:00]
= 2000H* 0^ (LEVEL/20).
Table 3.12
Attenuator Setting Level
ALA [13:00]
Output Level
3FFFH
+6.020dB
3000H
+3.523dB
2000H
0.000dB
1FFFH
0.001dB
1FFEH
0.002dB
16A7H
3.000dB
1000H
6.021dB
0002H
72.247dB
0001H
78.268dB
0000H
∞dB
Table 3.13
Attenuator Time Constants
Time Constant
DSA2
DSA1
fs
= 32 kHz
fs
= 44.1 kHz
fs
= 48 kHz
L
32 ms
23 ms
21 ms
L
H
128 ms
92 ms
86 ms
H
L
256 ms
186 ms
171 ms
H
512 ms
372 ms
341 ms
Time required for change from 0dB to
∞dB.
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相关代理商/技术参数 |
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|---|---|
| TC9446F | 制造商:TOSHIBA 制造商全称:Toshiba Semiconductor 功能描述:Audio Digital Processor for Decode of Dolby Digital (AC-3), MPEG2 Audio |
| TC9446F-033 | 制造商:Panasonic Industrial Company 功能描述:IC |
| TC9446FG | 制造商:TOSHIBA 制造商全称:Toshiba Semiconductor 功能描述:Audio Digital Processor for Decode of Dolby Digital (AC-3), MPEG2 Audio |
| TC9447F | 制造商:TOSHIBA 制造商全称:Toshiba Semiconductor 功能描述:Single-Chip Audio Digital Signal Processor |
| TC9452F | 制造商:TOSHIBA 制造商全称:Toshiba Semiconductor 功能描述:SINGLE CHIP SURROUND LSI |
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