WM8940
Pre-Production
SIGNAL TIMING REQUIREMENTS
SYSTEM CLOCK TIMING
tMCLKL
MCLK
tMCLKH
tMCLKY
Figure 1 System Clock Timing Requirements
Test Conditions
DCVDD=1.8V, DBVDD=AVDD=SPKVDD=3.3V, DGND=AGND=SPKGND=0V, TA = +25oC
PARAMETER
SYMBOL
TMCLKY
CONDITIONS
MIN
TYP
MAX
UNIT
System Clock Timing Information
MCLK=SYSCLK (=256fs)
MCLK input to PLL Note 1
81.38
20
ns
ns
MCLK cycle time
MCLK duty cycle
TMCLKDS
60:40
40:60
Note 1:
PLL pre-scaling and PLL N and K values should be set appropriately so that SYSCLK is no greater than 12.288MHz.
AUDIO INTERFACE TIMING – MASTER MODE
Figure 2 Digital Audio Data Timing – Master Mode (see Control Interface)
Pre-Production, Rev 3.0, February 2007
12
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WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
