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參數(shù)資料
| 型號(hào)： | TC9470FN |
| 元件分類(lèi)： | 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(yè)數(shù)： | 5/19頁(yè) |
| 文件大小： | 377K |
| 代理商： | TC9470FN |
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TC9470FN
2002-02-27
13
10.2.1 Setting Mode 1
Serial setting mode 1 is enabled when D12 = “L”.
(1)
Digital attenuator
The digital attenuation command is enabled when D12 = L. The attenuation data can be set in
4096 different ways (coefficient: 12 bit, maximum attenuation: 72.245dB). The relationship with
the command’s output is shown below.
Table 9 Attenuation Data/Audio Data Output
Attenuation Data
AT [11:00]
Audio Output
FFFH
0.000dB
FFEH
0.002dB
FFBH
0.004dB
C80H
2.142dB
640H
8.163dB
002H
66.224dB
001H
72.245dB
000H
∞
001 (HEX) to FFE (HEX): The attenuation value is obtained with the following equation.
ATT = 20 og (input data/4095) dB
Example: When the attenuation data is EA0H
ATT = 20 og (4000/4095) dB = 0.204dB
If an input level is set to 48dB or less when it is set as the amount (72.245dB) of the maximum
attenuation, the target effective attenuation data of digital attenuator of TC9470FN will be lost. The
output data is set to “0” when an input level is set to 48dB or less. An effective input level is
decided by the following formula.
Effective input data = [120dB + Attenuation level (dB)]
10.2.2 Setting Mode 2
Serial setting mode 2 is enabled when D12 = “H” and D11 = “L”.
(1)
Digital de-emphasis filter
Controlled with EMP.
Table 10 Digital De-Emphasis Filter Setting
EMP
L
H
De-emphasis filter
OFF
ON
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