OP4005B Datasheet, PDF (2/7 Pages) RF Monolithics, Inc – 622.08 MHz Optical Timing Clock

622.08 MHz
Optical Timing Clock
OP4005B Performance Parameters
The OP4005B has been developed to achieve high performance in five parameters critical to optical data communications
applications:
Low Jitter and Phase Noise - low clock jitter (or low phase noise in the frequency domain) is critical to achieving low bit error
rates in optical data communications systems. The OP4005B provides very low free-running jitter and phase noise at the
OC-12 clock rate, as shown in Figures 1 and 2. This makes the OP4005B an excellent reference for the generation or re-
generation of low-jitter clocks and data streams from the OC-12 rate up through OC-768. The OP4005B achieves this per-
formance over its full -40 to +85 °C operating temperature range using RFM's patented SAW oscillator architecture.
Single-Sideband Phase Noise
Figure 1
High Power Supply Noise Immunity - the OP4005B uses both differential active devices and differential SAW technology to
minimize the effects of power supply noise on jitter and phase noise, as shown in Figures 2 and 3. Optical data communi-
cations circuits must switch relatively high levels of current, making power supply noise immunity an important clock require-
ment.
Controlled Tuning Characteristics - the OP4005B voltage tuning constant, K_V, is bounded between 140 and 300 ppm/V un-
der locked conditions for reference signals with ±100 ppm or better stability over the OP4005B's full operating temperature
and supply voltage range. This allows a PLL based on the OP4005B to be designed with a well-controlled loop bandwidth
and damping factor, avoiding problems such a jitter peaking, etc. The voltage tuning characteristic of the OP4005B is mono-
tonic from 0 to 3.3 V, supporting reliable acquisition of phase lock. Figure 4 shows typical OP4005B tuning characteristics.
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OP4005B-051203
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