KD-VA9501 Microchip

(Preliminary) Analog Frequency Multiplier PL565-37/38 VCXO Family PRODUCT DESCRIPTION FEATURES The Analog Frequency Multiplier (AFM) is the Non-PLL frequency multiplication industrys first Balanced Oscillator utilizing analog Input frequency from 30-62.5 MHz multiplication of the fundamental frequency (at Output frequency from 120-250 MHz double or quadruple frequency), combined with an Low phase noise and jitter (equivalent to fundamental attenuation of the fundamental of the reference crystal at the output frequency) crystal, without the use of a phase-locked loop Ultra-low jitter (PLL), in CMOS technology. o RMS phase jitter < 0.25 ps (12kHz-20MHz) o RMS period jitter < 25 ps The PL565-37/38 products can achieve up to 250 Low phase noise MHz output frequency with little jitter or phase noise o -147 dBc/Hz 100kHz offset from 155.52 MHz deterioration. In addition, the low frequency input o -157 dBc/Hz 10MHz offset from 155.52 MHz crystal requirement makes the AFMs the most High linearity pull range (typ. 5%) affordable high-performance timing-source in the +/- 120 PPM pullability VCXO market. Low input frequency eliminates the need for expensive crystals Product Selector Differential output levels PECL or single-ended CMOS Part Number Output Type Single 3.3V, 10% power supply PL565-38 PECL Output Optional industrial temperature range (-40 C to +85 C) PL565-37 CMOS Output Figure 1: 4X AFM Phase Noise at 155.52MHz Micrel Inc. 2180 Fortune Drive San Jose, CA 95131 USA tel +1(408) 944 -0800 fax +1(408) 474-1000 www.micrel.com Rev 11/18/11 Page 1 (Preliminary) Analog Frequency Multiplier PL565-37/38 VCXO Family L2X VCON OE XIN Frequency QBAR X2 Oscillator Frequency Amplifier Q X4 XOUT Only required in x4 designs L4X Figure 2: Block Diagram of VCXO AFM Figure 3 shows the period jitter histogram of the 4X Analog Frequency Multiplier at 311.04 MHz, while Figure 4 shows the very low rejection levels of sub-harmonics that correspond to the exceptionally low jitter performance. Figure 3: Period Jitter Histogram at 155.52 MHz Figure 4: Spectrum Analysis at 155.52 MHz Analog Frequency Multiplier (4x) Analog Frequency Multiplier (4 x) with 38.88MHz crystal with sub-harmonics below 39 dBc OE LOGIC SELECTION OUTPUT OESEL OE Output State 0 (Default) Enabled 0 (Default) 1 Tri-state LVPECL 0 Tri-state 1 1 (Default) Enabled 0 Tri-state 0 (Default) 1 (Default) Enabled LVCMOS 0 (Default) Enabled 1 1 Tri-state OESEL and OE: Connect to VDD or leave floating to set to 1, connect to GND to set to 0. Internally set to default through pull-down / -up. Micrel Inc. 2180 Fortune Drive San Jose, CA 95131 USA tel +1(408) 944 -0800 fax +1(408) 474-1000 www.micrel.com Rev 11/18/11 Page 2