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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)： | 2/19頁 |
| 文件大?。?/td> | 377K |
| 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 192 fs (when 384 fs). The noise shaping
characteristics are shown in Figure 10.
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)
No
ise
p
o
we
r
(d
B
)
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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