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PLL1707 Datasheet(PDF) 10 Page - Texas Instruments

Part # PLL1707
Description  3.3-V DUAL PLL MULTICLOCK GENERATOR
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

PLL1707 Datasheet(HTML) 10 Page - Texas Instruments

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PLL1707
PLL1708
SLES065 – DECEMBER 2002
www.ti.com
10
The master clock can be either a crystal oscillator placed between XT1 (pin 10) and XT2 (pin 11), or an external input to
XT1. If an external master clock is used, XT2 must be open. Figure 8 illustrates possible system clock connection options,
and Figure 9 illustrates the 27-MHz master clock timing requirement.
Crystal
PLL1707/PLL1708
Crystal
OSC
Circuit
27-MHz
Internal
Master
Clock
XT1
XT2
C2
C1
MCKO1
MCKO2
C1, C2 = 10 pF to 33 pF
Crystal Resonator Connection
PLL1707/PLL1708
XT1
XT2
MCKO1
MCKO2
External Clock Input Connection
External
Clock
Crystal
OSC
Circuit
27-MHz
Internal
Master
Clock
Figure 8. Master Clock Generator Connection Diagram
t(XT1H)
XT1
t(XT1L)
0.7 VCC
0.3 VCC
DESCRIPTION
SYMBOL
MIN
MAX
UNIT
Master clock pulse duration HIGH
t(XT1H)
10
ns
Master clock pulse duration LOW
t(XT1L)
10
ns
Figure 9. External Master Clock Timing Requirement
The PLL1707/8 provides a very low-jitter, high-accuracy clock. SCKO0 outputs a fixed 33.8688-MHz clock, SCKO1 outputs
256 fS, 384 fS 512 fS, or 768 fS (fS = 48 kHz) which is selected by hardware or software control. The output frequency of
the remaining clocks is determined by the sampling frequency (fS) under hardware or software control. SCKO2 and SCKO3
output 256-fS and 384-fS system clocks, respectively. Table 2 shows each sampling frequency which can be programmed.
The system clock output frequencies for programmed sampling frequencies are shown in Table 3. The half sampling
frequencies on SCKO2 and SCKO3 and 256 fS and 384 fS on SCKO1 are supported only on the PLL1708.
Table 1. Generated System Clock SCKO1 Frequency
fS
SCKO1 FREQUENCY
256 fS†
12.288 MHz
384 fS†
18.432 MHz
512 fS
24.576 MHz
768 fS
36.864 MHz
† PLL1708 only


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