tc9470fn TOSHIBA Semiconductor CORPORATION, tc9470fn Datasheet - Page 10

• 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

6. DA Conversion Circuit
7. Data Output Circuit
type). The internal structure of this is shown in Figure 9.
characteristics are shown in Figure 0.
signals to be acquired from the IC’s RO (pin 5) and LO (pin 9) output pins.
The IC incorporates a second-order - modulation DA converter for two channels (simultaneous output
The - modulation clock has been designed to operate at 92 fs (when 384 fs). The noise shaping
The output circuit is equipped with a third-order analog low-pass filter. This enables direct analog
0
Data
10dB
Figure 10 Noise Shaping Characteristics
X (Z)
Figure 9 -û Modulation DA Converter
PDM signals
Second-order -û converter: Y (Z) = X (Z) + (1 í Z
+
Figure 11 Analog Filter Circuit
Limiter
Z
í1
í
+
Frequency (Hz)
Z
2
í1
500 k
10
+
í
Q
(bit-stream 1-bit DA conversion data)
Y (Z)
Output data
RO (LO)
VR
í1
)
2
Q (Z)
1 M
TC9470FN
2002-02-27