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參數(shù)資料
| 型號： | WM8716 |
| 廠商： | Wolfson Microelectronics |
| 英文描述： | High Performance 24-bit, 192kHz Stereo DAC |
| 中文描述： | 高性能24位，192kHz的立體聲DAC |
| 文件頁數(shù)： | 3/21頁 |
| 文件大?。?/td> | 351K |
| 代理商： | WM8716 |
Production Data
WM8716
WOLFSON MICROELECTRONICS LTD
PD Rev 3.1 April 2001
3
ELECTRICAL CHARACTERISTICS
TEST CONDITIONS
AVDD, DVDD = 5V, AGND, DGND = 0V, T
A
= +25
o
C, fs = 48kHz, SCKI = 256fs unless otherwise stated.
PARAMETER
DAC Circuit Specifications
SNR (See Notes 1 and 2)
THD (full-scale)
(See Note 2)
Dynamic range
(See Note 2)
Filter Characteristics (Sharp Roll-off)
Passband
Stopband
Passband ripple
Stopband Attenuation
Delay time
Filter Characteristics (Slow Roll-off)
Passband
Stopband
Passband ripple
Stopband Attenuation
Delay time
Internal Analogue Filter
Bandwidth
Passband edge response
Digital Logic Levels
Input LOW level
Input HIGH level
(See Note 3)
Output LOW level
Output HIGH level
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX
UNIT
105
112
-92
-97
112
dB
dB
dB
dB
0dB FS
-1dB FS
THD @ -60dB FS
105
±
0.0012 dB
-3dB
0.4535fs
dB
0.491fs
±
0.0012
dB
dB
s
f > 0.5465fs
-82
30/fs
±
0.001dB
-3dB
0.274fs
0.459fs
±
0.001
dB
dB
s
f > 0.732fs
-82
9/fs
-3dB
20kHz
195
-0.043
kHz
dB
V
IL
V
IH
0.8
2.0
V
V
OL
V
OH
I
OL
= 2mA
I
OH
= 2mA
AVSS + 0.3V
V
AVDD - 0.3V
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 over a 20Hz to 20kHz bandwidth.
2.
All performance measurements done with 20kHz low pass 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.
Except for Pin 12 (MODE8X) and Pin 17 (DIFFHW), where V
IH
= 2.6V min.
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.
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. (eg
THD+N @ -60dB= -32dB, DR= 92dB).
3.
THD+N (dB) is a ratio of the r.m.s. 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) 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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