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參數(shù)資料
| 型號： | WM8773 |
| 廠商： | Wolfson Microelectronics |
| 元件分類： | ADC |
| 英文描述： | 24-bit, 96kHz ADC with 8 Channel I/P Multiplexer |
| 中文描述： | 24位，96kHz的ADC，具有8通道I /頁復(fù)用器 |
| 文件頁數(shù)： | 7/30頁 |
| 文件大?。?/td> | 270K |
| 代理商： | WM8773 |
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Product Preview
WM8773
PP Rev 1.0 June 2002
7
Test Conditions
AVDD = 5V, DVDD = 3.3V, AGND = 0V, DGND = 0V, T
A
= +25
o
C, fs = 48kHz, MCLK = 256fs unless otherwise stated.
PARAMETER
SYMBOL
TEST CONDITIONS
Analogue input (AIN) to Analogue output (VOUT) (Load=10k ohms, 50pF, gain = 0dB) Record Monitor Output
0dB Full scale output voltage
MIN
TYP
MAX
UNIT
1.0 x
AVDD/5
100
-90
-95
50
45
Vrms
SNR (Note 1)
THD
90
dB
dB
dB
dB
dB
1kHz, 0dB
1kHz, -3dB
1kHz 100mVpp
20Hz to 20kHz
100mVpp
1kHz, 0dB
Power Supply Rejection Ratio
PSRR
Mute Attenuation (REC Output
Only)
Supply Current
Analogue supply current
Digital supply current
100
dB
AVDD = 5V
DVDD = 3.3V
100
20
mA
mA
Notes:
1.
Ratio of output level with 1kHz full scale input, to the output level with all zeros into the digital input, measured
‘
A
’
weighted.
2.
All performance measurements done with 20kHz low pass filter, and where noted an A-weight filter. Failure to use
such a filter will result in higher THD+N and lower SNR and Dynamic Range readings than are found in the Electrical
Characteristics. The low pass filter removes out of band noise; although it is not audible it may affect dynamic
specification values.
3.
VMID decoupled with 10uF and 0.1uF capacitors (smaller values may result in reduced performance).
TERMINOLOGY
1.
Signal-to-noise ratio (dB) - SNR is a measure of the difference in level between the full scale output and the output
with no signal applied. (No Auto-zero or Automute function is employed in achieving these results).
2.
Dynamic range (dB) - DNR is a measure of the difference between the highest and lowest portions of a signal.
Normally a THD+N measurement at 60dB below full scale. The measured signal is then corrected by adding the 60dB
to it. (e.g. THD+N @ -60dB= -32dB, DR= 92dB).
3.
THD+N (dB) - THD+N is a ratio, of the rms values, of (Noise + Distortion)/Signal.
4.
Stop band attenuation (dB) - Is the degree to which the frequency spectrum is attenuated (outside audio band).
5.
Channel Separation (dB) - Also known as Cross-Talk. This is a measure of the amount one channel is isolated from
the other. Normally measured by sending a full scale signal down one channel and measuring the other.
6.
Pass-Band Ripple - Any variation of the frequency response in the pass-band region.
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