WM8727GED/V 查看數據表（PDF） - Wolfson Microelectronics plc
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WM8727GED/V Datasheet PDF : 16 Pages
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WM8727
Production Data
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.
MASTER CLOCK TIMING
MCLK
tMCLKL
tMCLKH
tMCLKY
Figure 1 Master Clock Timing Requirements
Test Conditions
VDD = 5V, GND = 0V, TA = +25oC, fs = 48kHz, MCLK = 256fs unless otherwise stated.
PARAMETER
SYMBOL
System Clock Timing Information
MCLK Master clock pulse width high
MCLK Master clock pulse width low
MCLK Master clock cycle time
tMCLKH
tMCLKL
tMCLKY
MCLK Duty cycle
Time from MCLK stopping to power
down.
TEST CONDITIONS
MIN
8
8
20
40:60
1.5
DIGITAL AUDIO INTERFACE
tBCH
tBCL
BCKIN
tBCY
LRCIN
DIN
tDS
tLRH
tLRSU
tDH
TYP
MAX
60:40
12
UNIT
ns
ns
ns
µs
Figure 2 Digital Audio Data Timing
w
PD Rev 4.1 April 2004
6
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