參數(shù)資料
型號(hào)： M8761ED
廠商： Wolfson Microelectronics
英文描述： 24BIT 192KHZ STEREO DAC
中文描述： 24位192kHz的立體聲DAC
文件頁(yè)數(shù)： 7/20頁(yè)
文件大?。?/td> 223K
代理商： M8761ED
WM8761
Production Data
w
PD Rev 4.0 May 2004
7
Test Conditions
VDD = 5V, GND = 0V, T
A
= +25
o
C, fs = 48kHz, MCLK = 256fs unless otherwise stated.
PARAMETER
SYMBOL
Analogue Output Levels
Output level
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Load = 10k
, 0dBFS
Load = 10k
, 0dBFS,
(VDD = 3.3V)
1
V
RMS
V
RMS
0.72
Gain mismatch
channel-to-channel
Minimum resistance load
±1
%FSR
To midrail or a.c.
coupled
To midrail or a.c.
coupled
(VDD = 3.3V)
5V or 3.3V
1
k
1
k
Maximum capacitance load
Output d.c. level
Power On Reset (POR)
POR threshold
100
VDD/2
pF
V
1.8
V
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.
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.
CAP pin decoupled with 10uF and 0.1uF capacitors (smaller values may result in reduced performance).
Power down occurs 1.5
μ
s after MCLK is stopped.
2.
3.
4.
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.
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