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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)： | 17/19頁 |
| 文件大?。?/td> | 377K |
| 代理商： | TC9470FN |
TC9470FN
2002-02-27
7
The digitalization of the de-emphasis filter eliminates the need for such external components as resistors,
condensers and analog switches. In addition to this, the coefficients are aligned to reduce error in the
de-emphasis filter characteristics.
The filter structure and characteristics are shown below.
5. Dynamic Digital Bass Boost Circuit
ON/OFF for the dynamic digital bass boost is controlled in the parallel mode ( S
P/
= “H”) with the DBB1
pin (pin 20) and the DBB2 pin (pin 21).
This is set in the serial mode ( S
P/
= “L”) with a microcontroller or other equipment. (refer to 10.2
microcontroller setting mode for further details on serial mode settings.)
A block diagram for the dynamic bass boost circuit is shown in Figure 6.
The compressor’s compression ratio when in the control mode for the parallel mode is shown below.
Table 3 Compressor Compression Ratio (when in the parallel mode)
DBB max
18dB
DBB MID
12dB
The compressor’s compression characteristics are as follows:
Table 4 Compressor Compression Characteristics (when in the parallel mode)
DBB max
36dB
DBB MID
24dB
Figure 6 Dynamic Digital Bass Boost Circuit Block
+
INPUT
OUTPUT
SERIAL
ATTENUATOR
COMPRESSOR BLOCK
L.P.F
Coefficient length: 7 bits
Figure 4 IIR Digital De-Emphasis Filter
Figure 5 Filter Characteristics
|G (jω)|
1
/T
1
2
/T
1
T1 = 50 s, T2 = 15 s
+
Input data
b0
a1
b1
Z
1
)
+
=
1
0
Z
a
(1
)
Z
b
(b
(Z)
H
:
function
Transfer
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