OP4008B Datasheet, PDF (2/5 Pages) RF Monolithics, Inc – Quartz SAW Stabilized and Filtered “Diff Sine” Technology

669.327 MHz
Optical Timing Clock
OP4008B Tuning
The OP4008B will tune from 0 to 5 volts as shown in
the adjacent plot. For normal use in a PLL, the tuning
voltage will not change much from the nominal oper-
ating point. The operating point is determined by: (1)
the temperature of the OP4008B case, (2) the refer-
669.8
669.7
669.6
669.5
OP4008B
ence frequency from the PLL, and (3) the internal
MHz _669.4
characteristics of the key components used in the
669.3
OP4008B part. Although the nominal operating point
669.2
may be different from part to part by up to 1 volt, the
669.1
locked operation of the part in a PLL will not tune
669
more than 0.5 volts, allowing good linearity over the
operating range.
0
2 Tune Volts
4
6
Typical PLL
+Vcc
REF
holdover
Xtal
Loop Filter
Tune
Q
Q
OP4008B
.. _N
RFM's OPB-series Voltage Controlled SAW Clocks are designed for use in Phase Lock Loops (PLL’s) for optical timing ap-
plications. PLL operating parameters such as loop bandwidth are typically determined by optical timing requirements, and
noise reduction demands in a given system. The phase noise in the OP4008B Clock is good enough to allow the loop band-
width to be set at 100 Hz or less. Optical timing systems containing multiple or cascaded timing loops have additional con-
siderations that apply. For example, jitter peaking is often determined by VCO linearity.
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OP4008B-041003
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