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參數(shù)資料
| 型號(hào)： | SAA8200HL |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類(lèi)： | 消費(fèi)家電 |
| 英文描述： | Ensation Base integrated wireless audio baseband |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP100 |
| 封裝： | 14 X 14 MM, 1.40 MM HEIGHT, PLASTIC, MS-026, SOT-407-1, LQFP-100 |
| 文件頁(yè)數(shù)： | 37/71頁(yè) |
| 文件大小： | 298K |
| 代理商： | SAA8200HL |
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SAA8200HL_2
Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Preliminary data sheet
Rev. 02 — 17 October 2005
37 of 71
Philips Semiconductors
SAA8200HL
Ensation Base integrated wireless audio baseband
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 = 0 s
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.
Interpolation filter
pass band ripple
stop band
gain
dynamic range
up to 0.4535f
s
from 0.5465f
s
pass band
up to 0.4535f
s
±
0.02
72
1.1
>143
dB
dB
dB
dB
Fig 8.
Decimator data path
Table 17:
Description
Filter characteristics
…continued
Conditions
Value
Unit
001aab457
128f
s
COMB
8f
s
DC
HPF1
1f
s
1f
s
DC
HPF2
8f
s
sound features
halfband DSP
VOL.
CTRL
8f
s
HB3
4f
s
HB2
2f
s
HB1
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