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參數(shù)資料
| 型號： | TC9470FN |
| 廠商： | Toshiba Corporation |
| 英文描述： | ?-? Modulation DA Converter with Built-in 8-Times Oversampling Digital Filter/Dynamic Digital Bass Boost/Analog Filter |
| 中文描述： | ？ - ？調(diào)制DA轉(zhuǎn)換器與內(nèi)置8時報采樣數(shù)字濾波器/動態(tài)低音增強數(shù)字/模擬濾波器 |
| 文件頁數(shù)： | 10/20頁 |
| 文件大?。?/td> | 264K |
| 代理商： | TC9470FN |
TC9470FN
2002-02-27
10
6. DA Conversion Circuit
The IC incorporates a second-order
Σ
-
modulation DA converter for two channels (simultaneous output
type). The internal structure of this is shown in Figure 9.
The
Σ
-
modulation clock has been designed to operate at
1
92 fs (when 384 fs). The noise shaping
characteristics are shown in Figure
1
0.
7. Data Output Circuit
The output circuit is equipped with a third-order analog low-pass filter. This enables direct analog
signals to be acquired from the IC’s RO (pin 5) and LO (pin 9) output pins.
+
+
+
2
Q
Z
1
Z
1
X (Z)
Y (Z)
Data
Output data
(bit-stream 1-bit DA conversion data)
Limiter
Second-order
Σ
-
converter: Y (Z) = X (Z) + (1
Z
1
)
2
Q (Z)
Figure 9
Σ
-
Modulation DA Converter
Frequency (Hz)
N
0
500 k
1 M
10dB
Figure 10 Noise Shaping Characteristics
PDM signals
RO (LO)
VR
Figure 11 Analog Filter Circuit
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