tc9470fn TOSHIBA Semiconductor CORPORATION, tc9470fn Datasheet - Page 13

• 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

10.2.1 Setting Mode 1
10.2.2 Setting Mode 2
()
()
Digital attenuator
4096 different ways (coefficient: 2 bit, maximum attenuation: ï72.245dB). The relationship with
the command’s output is shown below.
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 ï48dB or less. An effective input level is
decided by the following formula.
Digital de-emphasis filter
Serial setting mode  is enabled when D2 = “L”.
The digital attenuation command is enabled when D2 = L. The attenuation data can be set in
00 (HEX) to FFE (HEX): The attenuation value is obtained with the following equation.
Example: When the attenuation data is EA0H
If an input level is set to ï48dB or less when it is set as the amount (ï72.245dB) of the maximum
Serial setting mode 2 is enabled when D2 = “H” and D = “L”.
Controlled with EMP.
ATT = 20 og (input data/4095) dB
Effective input data = ï[20dB + Attenuation level (dB)]
ATT = 20 og (4000/4095) dB = ï0.204dB
Table 9 Attenuation Data/Audio Data Output
Table 10 Digital De-Emphasis Filter Setting
De-emphasis filter
Attenuation Data
AT [11:00]
FFEH
FFBH
FFFH
C80H
640H
002H
001H
000H
EMP
···
···
···
13
OFF
L
Audio Output
í66.224dB
í72.245dB
í0.000dB
í0.002dB
í0.004dB
í2.142dB
í8.163dB
í’
···
···
···
ON
H
TC9470FN
2002-02-27