OP4004B Datasheet, PDF (2/7 Pages) RF Monolithics, Inc – 625.00 MHz Optical Timing Clock

625.00 MHz
Optical Timing Clock
OP4004B Performance Parameters
The OP4004B 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 OP4004B provides very low free-running jitter and phase noise at 1/16
the 10 G ethernet clock rate, as shown in Figures 1 and 2. This makes the OP4004B an excellent reference for the generation
or regeneration of low-jitter clocks and data streams. The OP4004B achieves this performance 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 OP4004B 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 OP4004B 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 OP4004B's full operating temperature
and supply voltage range. This allows a PLL based on the OP4004B 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 OP4004B is mono-
tonic from 0 to 3.3 V, supporting reliable acquisition of phase lock. Figure 4 shows typical OP4004B tuning characteristics.
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OP4004B-041003
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