SAA7373 Datasheet, PDF (14/60 Pages) NXP Semiconductors – Digital servo processor and Compact Disc decoder CD7

Philips Semiconductors
Digital servo processor and Compact Disc
decoder (CD7)
Product specification
SAA7373
Table 2 Output flags
F1 F2 F3 F4 F5 F6 F7 F8
DESCRIPTION
0 x x x x x x x no absolute time sync
1 x x x x x x x absolute time sync
x 0 0 x x x x x C1 frame contained no errors
x 0 1 x x x x x C1 frame contained 1 error
x 1 0 x x x x x C1 frame contained 2 errors
x 1 1 x x x x x C1 frame uncorrectable
x x x 0 0 x x 0 C2 frame contained no errors
x x x 0 0 x x 1 C2 frame contained 1 error
x x x 0 1 x x 0 C2 frame contained 2 errors
x x x 0 1 x x 1 C2 frame contained 3 errors
x x x 1 0 x x 0 C2 frame contained 4 errors
x x x 1 1 x x 1 C2 frame uncorrectable
x x x x x 0 0 x no interpolations
x x x x x 0 1 x at least one 1 sample interpolation
x x x x x 1 0 x at least one hold and no interpolations
x x x x x 1 1 x at least one hold and one 1 sample interpolation
7.6.2 C2FAIL
The C2FAIL pin indicates that invalid data has occurred on
the I²S-bus interface. However, due to the structure of the
corrector it is impossible to determine which byte has
failed. C2FAIL will go LOW for (140/n) µs when invalid
data is detected, this data may then occur (15/n) ms before
or after the pin is activated.
7.7 Audio functions
7.7.1 DE-EMPHASIS AND PHASE LINEARITY
When pre-emphasis is detected in the Q-channel
subcode, the digital filter automatically includes a
de-emphasis filter section. When de-emphasis is not
required, a phase compensation filter section controls the
phase of the digital oversampling filter to ≤ ±1° within the
band 0 to 16 kHz. With de-emphasis the filter is not phase
linear.
If the de-emphasis signal is set to be available at V5,
selected via register D, then the de-emphasis filter is
bypassed.
These attenuations do not include the sample-and-hold at
the external DAC output or the DAC post filter. When using
the oversampling filter, the output level is scaled −0.5 dB
down, to avoid overflow on full-scale sine wave inputs
(0 to 20 kHz).
Table 3 Filter specification
PASS BAND
0 to 9 kHz
19 to 20 kHz
−
−
−
−
−
−
−
STOP BAND
−
−
24 kHz
24 to 27 kHz
27 to 35 kHz
35 to 64 kHz
64 to 68 kHz
68 kHz
69 to 88 kHz
ATTENUATION
≤0.001 dB
≤0.03 dB
≥25 dB
≥38 dB
≥40 dB
≥50 dB
≥31 dB
≥35 dB
≥40 dB
7.7.2 DIGITAL OVERSAMPLING FILTER
The SAA7373 contains a 2 to 4 times oversampling IIR
filter. The filter specification of the 4 times oversampling
filter is given in Table 3.
1998 Jul 06
14