TC9470FN Datasheet, PDF (6/19 Pages) Toshiba Semiconductor – Modulation DA Converter with Built-in 8-Times Oversampling Digital Filter/Dynamic Digital Bass Boost/Analog Filter

TC9470FN
3. Digital Filter
The 8-times oversampling IIR digital filter eliminates the noise returned from outside the bandwidth
during standard operations.
Table 1 Basic Characteristics of Digital Filter
Set Mode
Standard operations
Passband Ripple
±0.11dB
Transient Bandwidth
20 k to 24.1 kHz
Attenuation
−26dB or less
The characteristics of the digital filter frequencies are shown below.
0 000
−10.00
−20.00
−30.00
−40.00
−50.00
−60.00
−70.00
−80.00
−90.00
−100 0
0
44.1
88 2
132.3
Frequency (kHz)
176.4
−0.00
−0.10
−0.20
−0.30
−0.40
−0.50
−0.60
−0.70
−0.80
0.65dB
−0.90
−1.00
0 2.0 4 0 6 0 8.0 10.0 12 0 14 0 16.0 18.0 20 0 22.0 24.0
Frequency (kHz)
Figure 3 Digital Filter Frequency Characteristics
4. De-Emphasis Filter
ON/OFF is controlled in the parallel mode ( P/S = “H”) with the SHIFT (EMP) pin (pin 19).
This is set in the serial mode ( P/S = “L”) with a microcontroller or other equipment. (refer to 10.2
microcontroller setting mode for further details on serial mode settings.)
Table 2 De-Emphasis Filter Settings (when in the parallel mode)
Shift (EMP) Pin
De-emphasis filter
H
L
ON
OFF
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2002-02-27