CLKIO
256f
S
Internal System Clock
Clock Divider
C
1
X’tal
XTI
R
C
2
XTO
C
1
= C
2
= 10 to 33pF
PCM3000/3001
CRYSTAL RESONATOR CONNECTION (X’tal must be fundamental made, parallel resonant)
CLKIO
External Clock
(TTL I/F)
CLKIO
256f
S
Internal System Clock
Clock Divider
256f
S
Internal System Clock
Clock Divider
External Clock
(CMOS I/F)
XTI
XTI
R
R
XTO
PCM3000/3001
EXTERNAL CLOCK INPUT 1: (XTO is open)
XTO
PCM3000/3001
EXTERNAL CLOCK INPUT 2: (XTO is open)
FIGURE 5. System Clock Connections.
t
CLKIH
t
CLKIL
XTI
3.2V
CLKIO
2.0V
0.8V
XTI or CLKIO
1.4V
System Clock Pulse Width High
System Clock Pulse Width Low
t
CLKIH
t
CLKIL
12ns (min)
12ns (min)
FIGURE 6. External System Clock Timing.
®
13
PCM3000/3001