Datasheet

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SLAS328 − SEPTEMBER 2001
8
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functional description (continued)
Initialization
Normal State
MUTE
VALID_L
5 ms max
10 µs Maximum
50−50 Duty Cycle
(P, M Complementary)
Inactive State
VALID_R
PWM Outputs
PWM_AP_L
PWM_AM_L
PWM_AP_R
PWM_AM_R
(P, M Complementary)
Figure 5. Mute Timing
double speed
Double-speed mode is used to support sampling rates of 88.2 kHz and 96 kHz. In order to put the TAS5010 in
double-speed mode with the device in normal operating conditions, the RESET
pin must be held low while
switching the DBSPD pin high. After the RESET
pin is brought high again, a reset sequence takes place. If the
change is at power up, a power-up sequence is originated.
quad speed
Quad-speed mode is used to support sampling rates of 176.4 kHz and 192 kHz. It is supported in slave mode
only. In order to put the TAS5010 in quad-speed mode, M_S and DBPSB pins are brought low. Quad-speed
mode is then automatically detected due to the fact that it is the only mode in which MCLK_IN is 128Fs.
de-emphasis filter
For audio sources that have been preemphasized, a precision 50 µs/15 µs de-emphasis filter is provided to
support the sampling rates of 44.1 kHz and 48 kHz. Pins DEM_SEL and DEM_EN select the de-emphasis
functions. See Figure 6 for a graph showing the de-emphasis filtering characteristics. See Table 3 for
de-emphasis selection.
0
−10
Response − dB
3.18 (50 µs) 10.6 (15 µs)
f − Frequency − kHz
De-emphasis
Figure 6. De-Emphasis Filter Characteristics