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参数资料
| 型号： | ADAV801ASTZ-REEL |
| 厂商： | ANALOG DEVICES INC |
| 元件分类： | 消费家电 |
| 英文描述： | Audio Codec for Recordable DVD |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PDSO64 |
| 封装： | ROHS COMPLIANT, MS-026BCD, LQFP-64 |
| 文件页数： | 17/56页 |
| 文件大小： | 1405K |
| 代理商： | ADAV801ASTZ-REEL |
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ADAV801
Selecting a Samp
The output sample rate of the ADC is always ADC MCLK/256,
as shown in Figure 23. By default, the ADC modulator runs at
ADC MCLK/2. When the ADC MCLK exceeds 12.288 MHz,
the ADC modulator should be set to run at ADC MCLK/4. This
is achieved by setting the AMC (ADC Modulator Clock) bit in
the ADC Control Register 1. To compensate for the reduced
modulator clock speed, a different set of filters are used in the
decimator section ensuring that the sample rate remains
the same.
Rev. 0 | Page 17 of 56
le Rate
-
ecause
ital
ut reduces the oversampling ratio,
cted
o generate a separate 12.288 MHz
eat
The AMC bit can also be used to boost the THD + N perform
ance of the ADC at the expense of dynamic range. The
improvement is typically 0.5 dB to 1.0 dB and works, b
selecting the lower modulator rate reduces the amount of dig
noise, improving THD + N, b
therefore reducing the dynamic range by a corresponding
amount.
For best performance of the ADC, avoid using similar
frequency clocks from separate sources in the ADAV801. For
example, running the ADC from a 12.288 MHz clock conne
to MCLKI and using the PLL t
clock for the DAC can reduce the performance of the ADC.
This is due to the interaction of the clocks, which generate b
frequencies that can affect the charge on the switch capacitors
of the analog inputs.
WAIT FOR SAMPLE
WAIT FOR SAMPLE
WAIT FOR SAMPLE
DECREASE GAIN BY 0.5dB
AND WAIT ATTACK TIME
IS SAMPLE
GREATER THAN ATTACK
THRESHOLD
IS
ABO
THRESHOLD
IS A RECOVERY
MODE ENABLED
SAMPLE
VE ATTACK
ARE ALL
SAMPLES BELOW
RECOVERY
THRESHOLD
HAS GAIN BEEN
FULLY RESTORED
YES
YES
NO
YES
YES
YES
NO
NO
NORMAL RECOVERY
INCREASE GAIN BY 0.5dB
WAIT RECOVERY TIME
LIMITED RECOVERY
ATTACK MODE
0
IS SAMPLE
ABOVE ATTACK
THRESHOLD
ARE ALL
SAMPLES BELOW
RECOVERY
THRESHOLD
HAS GAIN BEEN
FULLY RESTORED
IS GAINCNTR
AT MAXIMUM
YES
NO
NO
YES
YES
YES
NO
NO
INCREASE GAIN BY 0.5dB
NO
INCREMENT
GAINCNTR
NO
NO
NO
HAS RECOVERY
TIME BEEN
REACHED
HAS RECOVERY
TIME BEEN
REACHED
Figure 26. ALC Flow Diagram
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ADAV802AST | 制造商:Analog Devices 功能描述:AUDIO CODEC FOR RECORDABLE DVD - Bulk |
| ADAV802ASTZ | 制造商:Analog Devices 功能描述: |
| ADAV803 | 制造商:AD 制造商全称:Analog Devices 功能描述:Audio Codec for Recordable DVD |
| ADAV803AST | 制造商:Analog Devices 功能描述:AUDIO CODEC FOR RECORDABLE DVD - Bulk |
| ADAV803ASTZ | 功能描述:IC CODEC AUDIO R-DVD 3.3V 64LQFP RoHS:是 类别:集成电路 (IC) >> 接口 - 编解码器 系列:- 标准包装:2,500 系列:- 类型:立体声音频 数据接口:串行 分辨率（位）:18 b ADC / DAC 数量:2 / 2 三角积分调变:是 S/N 比，标准 ADC / DAC (db):81.5 / 88 动态范围，标准 ADC / DAC (db):82 / 87.5 电压 - 电源，模拟:2.6 V ~ 3.3 V 电压 - 电源，数字:1.7 V ~ 3.3 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-WFQFN 裸露焊盘 供应商设备封装:48-TQFN-EP（7x7） 包装:带卷 (TR) |
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