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)： 42/71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
42 of 71
Philips Semiconductors
SAA8200HL
Ensation Base integrated wireless audio baseband
7.20.1.3
Power-down
When the interpolator is powered down (bit CTRL_INTI[25] = 1), the gain in the
interpolator is decreased to
∞
dB to conform to a raised cosine function. This is followed
by a DC ramp down to zero output data (000000h). The slope of this DC ramp can be set
by bit CTRL_INTI[24] to either 512 f
s
periods (default) or 1024 f
s
periods. The power-up
follows the reverse procedure, a DC ramp up to mid scale plus DC dither (2 to [6 + 2] to
[10 + 2] to 17) followed by a gain increase to conform to a raised cosine function. Total
Fig 11. Interpolator mute signals
001aab466
raised cosine roll-off (128 periods of f
s
)
TRL_INTO[0] (mute state)
CTRL_INTI[19] (mute)
interpolator
4-bit output data
(analog representation)
Fig 12. Interpolator power-up and power-down sequence
001aab467
raised
cosine roll-off
(128 periods of f
s
)
DC ramp down
(512 periods of f
s
)
TRL_INTO[0] (mute state)
CTRL_INTI[25]
CTRL_INTO[1]
interpolator
4-bit output data
(analog representation)
640 periods of f
s
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