M844 ICST | Alldatasheet
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Technical content
M844 Rev 1.3 Revision 12Nov2003 Integrated Circuit Systems, Inc. ● Communications Modules ● www.icst.com ● tel (508) 852-5400 MULTI-RATE CLOCK RECOVERY Integrated Circuit Systems, Inc. Product Brief M844 GENERAL DESCRIPTION The M844 Multi-Rate Clock Recovery module provides low jitter clock recovery from NRZ or RZ input data formats. Four data rates are digitally selectable: 9.953, 10.3125, 10.664, or 10.709Gb/s. Incoming data is first amplified by a limiting amplifier. The data is then both: a) provided as the module’s unretimed data output, and b) applied to the clock recovery circuitry. A Phase Locked Loop (PLL) incorporates frequency multipliers and a SAW-based Voltage Control SAW Oscillator (VCSO) to minimize clock jitter. The VCSO provides the high Q, low noise, and high stability needed for the narrow bandwidth PLL operation. Micro-strip bandpass filters are used to produce sinusodal clock output with low harmonic and sub-harmonic distortion.
FEATURES
- 4 selectable NRZ or RZ rates: 9.953, 10.3125, 10.664, or 10.709Gb/s
- Superior VCSO-based PLL jitter performance 0.12 ps peak-to-peak max
- 0.02ps rms jitter, typical (12kHz-20MHz)
- Low phase noise -85dBc/Hz @ 1kHz offset
- 6mV peak-to-peak input sensitivity
- Up to 700mV peak-to-peak un-retimed NRZ or RZ data output
- +5V and -5V power supplies
- Designed for high-speed fiber optic applications
- Easy to connect 1.575 x 3.2 inch SMA package PIN ASSIGNMENT (1.575 x 3.2 inch SMA) BLOCK DIAGRAM Example Input/Output Frequency Combinations Operating Data Rate (Gb/s) Clock Output Freq (GHz) Application OC-192 OC-48 9.9530 9.9530 2.488 OC-19210.3125 10.3125 2.577 10.6640 10.6640 2.666 10.7090 10.7090 2.677 M844 1/4 CLK_OUT CLK_OUT DATA_OUT DATA_IN CONT 2 CONT 1 ALM GND GND VCC +5V Din 1/4Cout Cout Dout VEE -5V M844 DATA_IN CLK_OUT Rate Select Frequency Multiplier Frequency Multiplier Lim Amp RF Amp DATA_OUT Phase Detector RF Amp RF Amp Op- Amp RF Amp 1/4CLK_OUT RF Amp Pwr Div SAW Delay Lines 1 - 4 SP4T SW SP4T SW Phase Shifter Pwr Div Frequency Multiplier Pwr Div M844 Multi-Rate Clock Recovery