參數(shù)資料
型號(hào)： SAA8200HL
廠商： NXP SEMICONDUCTORS
元件分類： 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)： 38/71頁(yè)
文件大?。?/td> 298K
代理商： SAA8200HL
SAA8200HL_2
Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Preliminary data sheet
Rev. 02 — 17 October 2005
38 of 71
Philips Semiconductors
SAA8200HL
Ensation Base integrated wireless audio baseband
7.19.2.3
Soft start-up after reset
After a reset of the decimation filter and if bit EN_DBLIN (SADC_CTRL_DECI[21]) is a
logic 1, the output gain of the decimator is increased from mute to
63.5 dB and at a rate
of 0.5 dB per f
s
period to 0 dB (dB linear) to avoid harsh audible plops. The time required
for a complete soft start-up if bit EN_DBLIN is a logic 1 for 128 f
s
periods. This time is
without the time required if bit EN_DELAY_DBLIN (SADC_CTRL_DECI[21]) is a logic 1,
e.g. if bit EN_DBLIN and bit EN_DELAY_DBLIN are a logic 1, bit EN_DCFILTI and bit
EN_DCFILTO are logic 0 the total time required is (44 +128) f
s
periods (see
Table 18
). The
decimator soft start-up function is illustrated in
Figure 9
.
7.19.2.4
Signal polarity
The polarity of the output signal is controlled by bit EN_POL_INV
(SADC_CTRL_DECI[17]). When this bit is enabled, the polarity of the output data is
inverted.
Table 18:
EN_DELAY_DBLIN EN_DBLIN
0
0
1
1
1
1
1
1
Required time after reset
EN_DCFILTI
X
X
0
1
X
0
1
X
EN_DCFILTO
X
X
0
0
1
0
0
1
Required time
0 s
128 periods of f
s
44 periods of f
s
17066 periods of f
s
67473 periods of f
s
(44 + 128) periods of f
s
(17066 + 128) periods of f
s
(67473 + 128) periods of f
s
0
1
0
0
0
1
1
1
For readability, the parallel output data is shown in its analog representation.
Fig 9.
Soft start-up function
001aab463
44
periods of f
s
128
periods of f
s
ABLE_DELAY_DBLIN = 1
DOUT
(analog representation)
ENABLE_DBLIN = 1
RESET = 0
EN_DCFILTO = 0
EN_DCFILTI = 0
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