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參數(shù)資料
| 型號： | SAA8200HL |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 消費家電 |
| 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 |
| 文件頁數(shù)： | 39/71頁 |
| 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
39 of 71
Philips Semiconductors
SAA8200HL
Ensation Base integrated wireless audio baseband
7.19.2.5
Mute
When the left and right channel of the decimator are muted (bit EN_MUTE is a logic 1),
the gain in the decimator is decreased linearly to
63.5 dB with a final step to mute at a
rate of 0.5 dB per f
s
period (dB linear). This is done to avoid harsh audible plops. The time
required for a complete mute depends on the initial gain setting. Maximum required time is
256 f
s
periods. When a complete mute is achieved for both left and right channels, the bit
MUTE_STATE (SADC_CTRL_DECO[0]) is made logic 1. When the channels are
de-muted (bit EN_MUTE is a logic 0) the gain of the decimator is increased at the same
rate until the programmed gain setting is achieved.
7.19.2.6
Overflow detection
The output signal is used to indicate whenever the output data, in either the left or right
channel, is larger than
1.16 dB of the maximum possible digital swing. When this
condition is detected the overflow bit (SADC_CTRL_DECO[1]) is forced to a logic 1 for at
least 512 f
s
cycles (11.6 ms at f
s
= 44.1 kHz) allowing even a slow microcontroller to poll
this event. This time-out is reset for each infringement.
7.19.2.7
AGC function
The decimation filter is equipped with an Automatic Gain Control (AGC) block. This
function is intended, when enabled, to keep the output signal at a constant level.
The AGC can be used for microphone applications in which the distance to the
microphone is not always the same.
The AGC can be enabled via the control register (SADC_CTRL_DECI[23]). In this case it
bypasses the digital volume control. Other features of the AGC, such as the attack, decay
and target level can be set via the same register.
The DC filter in front of the decimation filter must be enabled when AGC is in operation,
otherwise the output will be disturbed by the DC offset added in the ADC.
Table 19:
AGC_EN
0
AGC enable control
AGC function
disabled, manual gain control via the left/right decimator volume
control, (default)
enabled, with manual microphone gain settings via PGA
1
Table 20:
AGC_LEVEL1
0
0
1
1
AGC target level settings
AGC_LEVEL0
0
1
0
1
AGC target level value (dB)
5.5
8.0
11.5
14.0
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| SAA8200HL/N100,518 | 制造商:ST-Ericsson 功能描述:SAA8200HL Series Ensation Base Integrated Wireless Audio Baseband - LQFP-100 |
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| SA-A870-FREQ | 制造商:NEL 制造商全稱:Nel Frequency Controls,inc 功能描述:Positive ECL (PECL) |
| SA-A871-FREQ | 制造商:NEL 制造商全稱:Nel Frequency Controls,inc 功能描述:Positive ECL (PECL) |
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