SAA8200HL Datasheet, PDF (37/71 Pages) NXP Semiconductors – Ensation Base integrated wireless audio baseband

Philips Semiconductors
SAA8200HL
Ensation Base integrated wireless audio baseband
Table 17: Filter characteristics …continued
Description
Conditions
Value
Unit
Interpolation filter
pass band ripple
up to 0.4535f_s
±0.02
dB
stop band
from 0.5465f_s
−72
dB
gain
pass band
−1.1
dB
dynamic range
up to 0.4535f_s
>143
dB
128 f_s
COMB
8 f_s
DC
HPF1
8f_{s VOL.}
CTRL
8 f_s
HB3
4 f_s
HB2
2 f_s
HB1
1f_{s DC} 1f_s
HPF2
sound features
Fig 8. Decimator data path
halfband DSP
001aab457
7.19.2.1 Volume control
The decimator is equipped with a digital volume control. This volume control is separate
for left and right and can be set via the SADC_CTRL_DECI register. The range is from
+24 dB down to −63 dB and mute in steps of 0.5 dB.
7.19.2.2 DC blocking filter
Two optional 1st order Infinite Impulse Response (IIR) high-pass filters are provided to
remove unwanted DC components from the input (DC offset, DC dither) and/or volume
control output to avoid clipping when using large gain settings. These filters may be
bypassed by setting bits EN_DCFILTI (SADC_CTRL_DECI[20]) and/or EN_DCFILTO
(SADC_CTRL_DECI[19]) to a logic 0, which is necessary when fast settling of the
decimator is required.
On recovery from power-down or after a reset, the parallel output data on bits dout_l[23:0]
and DOUT_R[23:0] is held at logic 0 until valid data is available from the decimation filter.
This time depends on which of the DC-blocking filters is selected and if the ENABLE bit of
the delay timer is ON (EN_DELAY_DBLIN = SADC_CTRL_DECI[21]):
• EN_DELAY_DBLIN OFF:
t=0s
• DC filter 1 is off, DC filter 2 is off and EN_DELAY_DBLIN is on:
t = 44/f_s; t = 1 ms at f_s = 44.1 kHz
• DC filter 1 is ON, DC filter 2 is OFF and EN_DELAY_DBLIN is ON:
t = 17066/f_s; t = 387 ms at f_s = 44.1 kHz
• DC filter 2 is ON and EN_DELAY_DBLIN is ON:
t = 67473/f_s; t = 1.53 s at f_s = 44.1 kHz.
SAA8200HL_2
Preliminary data sheet
Rev. 02 — 17 October 2005
© Koninklijke Philips Electronics N.V. 2005. All rights reserved.
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