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843003AGLF Datasheet(PDF) 1 Page - Integrated Device Technology |
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843003AGLF Datasheet(HTML) 1 Page - Integrated Device Technology |
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1 / 21 page  FEMTOCLOCKS™ CRYSTAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER ICS843003 IDT™ / ICS™ LVPECL FREQUENCY SYNTHESIZER 1 ICS843003AG REV. A OCTOBER 23, 2008 General Description The ICS843003 is a 3 differential output LVPECL Synthesizer designed to generate Ethernet refer- ence clock frequencies and is a member of the HiPerClocks™family of high performance clock solutions from IDT. Using a 31.25MHz or 26.041666MHz, 18pF parallel resonant crystal, the following frequencies can be generated based on the settings of 4 fre- quency select pins (DIV_SEL[A1:A0], DIV_SEL[B1:B0]): 625MHz, 312.5MHz, 156.25MHz, and 125MHz. The 843003 has 2 output banks, Bank A with 1 differential LVPECL output pair and Bank B with 2 differential LVPECL output pairs. The two banks have their own dedicated frequency select pins and can be independently set for the frequencies mentioned above. The ICS843003 uses IDT’s 3rd generation low phase noise VCO technology and can achieve 1ps or lower typical rms phase jitter, easily meeting Ethernet jitter requirements. The ICS843003 is packaged in a small 24-pin TSSOP package. Features • Three 3.3V LVPECL outputs on two banks, A Bank with one LVPECL pair and B Bank with 2 LVPECL output pairs • Using a 31.25MHz or 26.041666 crystal, the two output banks can be independently set for 625MHz, 312.5MHz, 156.25MHz or 125MHz • Selectable crystal oscillator interface or LVCMOS/LVTTL single-ended input • VCO range: 560MHz – 700MHz • RMS phase jitter @ 156.25MHz (1.875MHz - 20MHz): 0.51ps (typical) Offset Noise Power 100Hz ................ -96.8 dBc/Hz 1kHz .................. -119.1 dBc/Hz 10kHz ................ -126.4 dBc/Hz 100kHz .............. -127.0 dBc/Hz • Full 3.3V supply mode • 0°C to 70°C ambient operating temperature • Industrial temperature available upon request • Available in both standard (RoHS 5) and lead-free (RoHS 6) packages HiPerClockS™ ICS Pin Assignment ICS843003 24-Lead TSSOP 4.4mm x 7.8mm x 0.925mm package body G Package 1 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 20 19 18 17 16 15 14 13 DIV_SELB0 VCO_SEL MR VCCO_A QA0 nQA0 OEB OEA FB_DIV VCCA VCC DIV_SELA0 DIV_SELB1 VCCO_B nQB0 QB0 nQB1 QB1 XTAL_SEL TEST_CLK XTAL_IN XTAL_OUT VEE DIV_SELA1 Block Diagram 0 1 0 1 Phase Detector VCO 625MHz 0 = ÷20 (default) 1 = ÷24 0 0 ÷1 0 1 ÷2 (default) 1 0 ÷4 1 1 ÷5 0 0 ÷1 0 1 ÷2 1 0 ÷4 (default) 1 1 ÷5 FB_DIV OSC QA0 nQA0 QB0 nQB0 QB1 nQB1 2 2 Pullup Pulldown Pulldown:Pullup Pullup Pulldown Pulldown Pullup Pullup:Pulldown Pullup OEA DIV_SELA[1:0] VCO_SEL TEST_CLK MR OEB DIV_SELB[1:0] FB_DIV XTAL_OUT XTAL_SEL XTAL_IN |
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