Cirrus Logic CS49DV8C - Manual (Page 13)

DS868PP2 Copyright 2008 Cirrus Logic, Inc. 13
CS49DV8C Data Sheet
32-bit Audio DSP Family
5.7 Switching Characteristics — XTI
Figure 2. XTI Timing
5.8 Switching Characteristics — Internal Clock
Parameter Symbol Min Max Unit
External Crystal operating frequency
1
1. Part characterized with the following crystal frequency values: 11.2896, 12.288, 18.432, 24.576, and 27
MHz.
F
xtal
11.2896 27 MHz
XTI period T
clki
33.3 100 ns
XTI high time T
clkih
13.3 - ns
XTI low time T
clkil
13.3 - ns
External Crystal Load Capacitance (parallel resonant)
2
2. C
L
refers to the total load capacitance as specified by the crystal manufacturer. Crystals which require a
C
L
outside this range should be avoided. The crystal oscillator circuit design should follow the crystal
manufacturer’s recommendation for load capacitor selection.
C
L
10 18 pF
External Crystal Equivalent Series Resistance ESR 50 W
Parameter Symbol Min Max Unit
Internal DCLK frequency
1
CS49DV8C-CVZ
CS49DV8C-CVZR
1.After initial power-on reset, F
dclk
= F
xtal
. After initial kickstart commands, the PLL is locked to max F
dclk
and remains
locked until the next power-on reset.
F
dclk
F
xtal
150
MHz
Internal DCLK period
1
CS49DV8C-CVZ
CS49DV8C-CVZR
DCLKP
6.7 1/F
xtal
ns
t
clkih
t
clkil
T
clki
XTI