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MAX3872 Datasheet(PDF) 4 Page - Maxim Integrated Products |
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MAX3872 Datasheet(HTML) 4 Page - Maxim Integrated Products |
4 / 13 page Multirate Clock and Data Recovery with Limiting Amplifier 4 _______________________________________________________________________________________ AC ELECTRICAL CHARACTERISTICS (continued) (VCC = +3.0V to +3.6V, TA = -40°C to +85°C. Typical values are at VCC = +3.3V and TA = +25°C, unless otherwise noted.) (Note 5) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS CML OUTPUT SPECIFICATIONS (SDO ±, SCLKO±) Output Edge Speed tr, tf 20% to 80% 110 ps CML Output Differential Swing RC = 100 Ω differential 600 800 1000 mVP-P Clock-to-Q Delay tCLK-Q (Note 9) -50 +50 ps PLL ACQUISITION/LOCK SPECIFICATIONS Tolerated Consecutive Identical Digits BER ≤ 10-10 2000 bits Acquisition Time Figure 4 (Note 10) 5.5 ms LOL Assert Time Figure 4 2.3 100.0 µs Low-Frequency Cutoff for DC-Offset Cancellation CAZ = 0.1µF 4 kHz CLOCK HOLDOVER SPECIFICATIONS Reference Clock Frequency Table 3 Maximum VCO Frequency Drift (Note 11) 400 ppm Note 5: AC characteristics are guaranteed by design and characterization. Note 6: Jitter tolerance is guaranteed (BER ≤ 10-10) within this input voltage range. Input threshold adjust is disabled with VCTRL connected to VCC. Note 7: Measured at OC-48 data rate using a 100mVP-P differential swing with a 20mVDC offset and an edge speed of 145ps (4th- order Bessel filter with f3dB = 1.8GHz). Note 8: Measured with 10mVP-P differential input, 223 - 1 PRBS pattern at OC-48 with bandwidth from 12kHz to 20MHz. Note 9: Relative to the falling edge of the SCLKO+ (Figure 3). Note 10: Measured using a 0.82µF loop-filter capacitor initialized to +3.6V. Note 11: Measured at OC-48 data rate under LOL condition with the CDR clock output set by the external reference clock. (a) AC-COUPLED SINGLE-ENDED INPUT (b) DC-COUPLED SINGLE-ENDED INPUT 5mV 5mV 800mV 800mV VCC + 0.4V VCC VCC - 0.4V VCC VCC - 0.4V VCC - 0.8V Figure 1. Definition of Input Voltage Swing 1.3 2.10 THRESHOLD- SETTING ACCURACY (PART-TO-PART VARIATION OVER PROCESS) VCTRL (V) VTH (mV) +188 +170 +152 -152 -170 -188 THRESHOLD-SETTING STABILITY (OVERTEMPERATURE AND POWER SUPPLY) 0.3 1.1 Figure 2. Relationship Between Control Voltage and Threshold Voltage Timing Diagrams |
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