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參數(shù)資料
| 型號： | ADAV803ASTZ-REEL |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 消費家電 |
| 英文描述： | 8-Channel 14-Bit Single-Supply Voltage-Output DAC; Package: LQFP (10x10mm); No of Pins: 52; Temperature Range: Industrial |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP64 |
| 封裝： | ROHS COMPLIANT, MS-026BCD, LQFP-64 |
| 文件頁數(shù)： | 17/56頁 |
| 文件大?。?/td> | 906K |
| 代理商： | ADAV803ASTZ-REEL |
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ADAV803
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 is used
in the decimator section ensuring that the sample rate remains
the same.
Rev. 0 | Page 17 of 56
le Rate
-
ecause
ital
atio,
f the clocks, which generate beat
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, but reduces the oversampling r
therefore reducing the dynamic range by a corresponding
amount.
For best performance of the ADC, avoid using similar fre-
quency clocks from separate sources in the ADAV803. For
example, running the ADC from a 12.288 MHz clock connected
to MCLKI and using the PLL to generate a separate 12.288 MHz
he performance of the ADC.
clock for the DAC can reduce t
This is due to the interaction o
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 A RECOVERY
MODE ENABLED
IS
GREATE
TH
SAMPLE
R THAN ATTACK
RESHOLD
IS SAMPLE
ABOVE ATTACK
THRESHOLD
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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