CDC421xxx www.ti.com SLAS540 – APRIL 2007 FULLY INTEGRATED FIXED FREQUENCY LOW-JITTER, CRYSTAL-OSCILLATOR CLOCK GENERATOR • FEATURES • • • • • Single 3.3 V Supply High-Performance Clock Generator, Incorporating Crystal Oscillator Circuitry With Integrated Frequency Synthesizer Low Output Jitter, as Low as 380 fs (rms integrated between 10 kHz–20 MHz) Low Phase Noise at 312.5 MHz, Less Than –120 dBc/Hz at 10 kHz and –147 dBc/Hz at 10 MHz Offset From the Carrier Supports Crystal Frequencies or LVCMOS Input Frequencies at 31.25 MHz, 33.33 MHz, and 35.42 MHz • • • • • • • Output Frequencies: 100 MHz, 106.25 MHz, 125 MHz, 156.25 MHz, 212.5 MHz, 250 MHz, and 312.5 MHz Differential Low-Voltage Positive Emitter Coupled Logic (LVPECL) Output Fully Integrated Voltage-Controlled Oscillator (VCO) Running from 1.75 GHz to 2.35 GHz Typical Power Consumption 300 mW Chip-Enable Control Pin QFN-24 Package ESD Protection Exceeds 2 kV HBM Industrial Temperature Range –40°C to 85°C A APPLICATIONS A • A Low-Cost, Low-Jitter Frequency Multiplier A External Crystal LVPECL VCO Output Divider Feedback Divider CLK Prescaler Crystal Oscillator Input PFD/Charge Pump Loop Filter NCLK B0216-02 DESCRIPTION CDC421xxx is a high-performance, low-phase-noise clock generator. It has an integrated low-noise, LC-based voltage-controlled oscillator (VCO) that operates within the 1.75 GHz–2.35 GHz frequency range. It has an integrated crystal oscillator that operates in conjunction with an external AT-cut crystal to produce a stable frequency reference for the PLL-based frequency synthesizer. The output frequency (fout) is proportional to the frequency of the input crystal (fxtal). The device operates in a 3.3 V supply environment and is characterized for operation from –40°C to 85°C. CDC421xxx is available in a QFN-24 package. A high-level block diagram of the CDC421xxx is shown in Figure 1. Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. Copyright © 2007, Texas Instruments Incorporated CDC421xxx www.ti.com SLAS540 – APRIL 2007 XIN 1 XIN 2 Crystal Oscillator Loop Filter PFD/ Charge Pump VCO Prescaler Output Divider Feedback Divider B0230-01 Figure 1. High-Level Block Diagram of the CDC421xxx PACKAGE (QFN-24) The CDC421xxx is packaged in a QFN-24 terminal package. The QFN package footprint is shown. Terminal locations and numbers are shown in Figure 2. NC NC XIN2 XIN 1 NC NC 24 23 22 21 20 19 RGE PACKAGE (TOP VIEW) CE 1 18 NC NC 2 17 VCC NC 3 16 VCC CDC421xxx 12 NC NC 13 11 6 NC NC 10 NC OUTP 14 9 5 GND NC 8 NC GND 15 7 4 OUTN NC P0024-06 Figure 2. Pinout of the CDC421xxx QFN-24 Package The terminal functions table shows the terminal descriptions for the CDC421xxx QFN-24 package. Table 1. TERMINAL FUNCTIONS TERMINAL NAME 2 NO. TYPE ESD PROTECTION DESCRIPTION VCC 16, 17 Power Y 3.3V power supply GND 8, 9 GND Y Ground XIN 1 XIN 2 21 22 I I Y N In crystal input mode, connect XIN1 to one end of the crystal and XIN2 to the other end of the crystal. In LVCMOS single-ended driven mode, XIN1 (pin 21) acts as input reference and XIN2 should connect to GND. Submit Documentation Feedback CDC421xxx www.ti.com SLAS540 – APRIL 2007 Table 1. TERMINAL FUNCTIONS (continued) TERMINAL NAME NO. TYPE ESD PROTECTION DESCRIPTION CE 1 I Y Chip enable (LVCMOS input) CE = 1 enables the device and the outputs. CE = 0 disables all current sources (LVPECLP = LVPECLN = Hi-Z). OUTP 10 O Y High-speed positive differential LVPECL output. (Outputs are enabled by CE ) OUTN 7 O Y High-speed negative differential LVPECL output. (Outputs are enabled by CE ) 2–6, 11–15, 18–20, 23, 24 I or O Y TI test pin. Do not connect; leave floating. NC DEVICE SELECTION The CDC421xxx device is an LVPECL low-phase-noise clock generator designed to work with a low-frequency AT-crystal oscillator of a single-ended LVCMOS. Table 2. Device Selection Table for CDC421xxx CDC421xxx INPUT FREQUENCY OR CRYSTAL VALUE (MHz) OUTPUT FREQUENCY FOR THE SPECIFIED INPUT FREQUENCY (MHz) QFN-24 tape and reel 33.3333 100.00 QFN-24 small tape and reel 33.3333 100.00 CDC421106RGER QFN-24 tape and reel 35.4167 106.25 421106 CDC421106RGET QFN-24 small tape and reel 35.4167 106.25 421125 CDC421125RGER QFN-24 tape and reel 31.2500 125.00 421125 CDC421125RGET QFN-24 small tape and reel 31.2500 125.00 421156 CDC421156RGER QFN-24 tape and reel 31.2500 156.25 421156 CDC421156RGET QFN-24 small tape and reel 31.2500 156.25 421212 CDC421212RGER QFN-24 tape and reel 35.4167 212.50 421212 CDC421212RGET QFN-24 small tape and reel 35.4167 212.50 421250 CDC421250RGER QFN-24 tape and reel 31.2500 250.00 421250 CDC421250RGET QFN-24 small tape and reel 31.2500 250.00 421312 CDC421312RGER QFN-24 tape and reel 31.2500 312.50 421312 CDC421312RGET QFN-24 small tape and reel 31.2500 312.50 DEVICE MARKING ORDERING PART NUMBER 421100 CDC421100RGER 421100 CDC421100RGET 421106 PACKAGE ABSOLUTE MAXIMUM RATINGS over operating free-air temperature range (unless otherwise noted) (1) VALUE UNIT –0.5 to 4.6 V –0.5 to VCC + 0.5 V Output current for LVPECL –50 mA Electrostatic discharge (HBM) 2k V –40 to 85 °C 125 °C –65 to 150 °C VCC Supply voltage (2) VI Voltage range for all other input pins (2) IO TA Characterized free-air temperature range (no airflow) TJ Maximum junction temperature Tstg Storage temperature range (1) (2) Stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under recommended operating conditions is not implied. Exposure to absolute-maximum rated conditions for extended periods may affect device reliability. All voltage values are with respect to network ground terminal. Submit Documentation Feedback 3 CDC421xxx www.ti.com SLAS540 – APRIL 2007 RECOMMENDED OPERATING CONDITIONS over operating free-air temperature range (unless otherwise noted) VCC Supply voltage TA Ambient temperature, no airflow, no heat sink MIN NOM MAX 3 3.3 3.6 V 85 °C –40 UNIT ELECTRICAL CHARACTERISTICS over recommended operating conditions for CDC421xxx device PARAMETER VCC Supply voltage IVCC Total current at 3.3 V TEST CONDITIONS MIN TYP 3 3.3 3.6 V 91 110 mA MHz 3.3 V, 312.5 MHz MAX UNIT LVPECL OUTPUT fCLK Output frequency 100 312.5 VOH LVPECL high-level output voltage VCC – 1.20 VCC – 0.81 VOL LVPECL low-level output voltage VCC – 2.17 VCC – 1.36 |VOD| LVPECL differential output voltage 407 1076 tr Output rise time 20% to 80% of VOUTpp 170 tf Output fall time 80% to 20% of VOUTpp 170 Duty cycle of the output waveform 45% V V mV ps ps 55% LVCMOS INPUT 4 VIL,CMOS Low-level CMOS input voltage VCC = 3.3 V VIH,CMOS High-level CMOS input voltage VCC = 3.3 V IL,CMOS Low-level CMOS input current VCC = VCC max, VIL = 0 V IH,CMOS High-level CMOS input current VCC = VCC min, VIH = 3.7 V Submit Documentation Feedback 0.3 VCC 0.7 VCC V V –200 µA 200 µA CDC421xxx www.ti.com SLAS540 – APRIL 2007 JITTER CHARACTERISTICS IN INPUT CLOCK MODE The jitter characterization test is performed using an LVCMOS input signal driving the CDC421xxx device. 0.1 mF Phase Noise Analyzer XIN 1 50 W 100 pF CDC421xxx XIN 2 150 W 150 W 150 W S0246-02 Figure 3. Jitter Test Configuration for an LVTTL Input Driving CDC421xxx For the cases of the CDC421xxx being referenced by an external, clean LVCMOS input of 31.25 MHz, 33.33 MHz and 35.4167 MHz, the following tables list the measured SSB phase noise of all the outputs supported by the CDC421xxx device, (100 MHz, 106.25 MHz, 125 MHz, 156.25 MHz, 212.5 MHz, 250 MHz, and 312.5 MHz) from 100 Hz to 20 MHz from the carrier. Table 3. Phase Noise Parameters With LVCMOS Input of 33.3333 MHz and LVPECL Output at 100.00 MHz PARAMETER MIN TYP MAX UNIT Phase Noise Specifications Under Following Conditions: fin = 33.3333 MHz, fout = 100.00 MHz phn100 Phase noise at 100 Hz –111 dBc/Hz phn1K Phase noise at 1 kHz –121 dBc/Hz phn10k Phase noise at 10 kHz –131 dBc/Hz phn100k Phase noise at 100 kHz –133 dBc/Hz phn1M Phase Noise at 1 MHz –142 dBc/Hz phn10M Phase noise at 10 MHz –149 dBc/Hz phn20M Phase noise at 20 MHz –149 dBc/Hz JRMS RMS jitter integrated from 12 kHz to 20 MHz 507 fs Tj Total jitter 35.33 ps Dj Deterministic jitter 11.54 ps Table 4. Phase Noise Parameters With LVCMOS Input of 35.4167 MHz and LVPECL Output at 106.25 MHz PARAMETER MIN TYP MAX UNIT Phase Noise Specifications Under Following Conditions: fin= 35.4167 MHz , fout = 106.25 MHz phn100 Phase noise at 100 Hz –112 dBc/Hz phn1K Phase noise at 1 kHz –121 dBc/Hz phn10k Phase noise at 10 kHz –125 dBc/Hz phn100k Phase noise at 100 kHz –129 dBc/Hz phn1M Phase noise at 1 MHz –142 dBc/Hz phn10M Phase noise at 10 MHz –151 dBc/Hz phn20M Phase noise at 20 MHz –151 dBc/Hz JRMS RMS jitter integrated from 12 kHz to 20 MHz Tj Total jitter Dj Deterministic jitter Submit Documentation Feedback 530 fs 30.39 ps 11 ps 5 CDC421xxx www.ti.com SLAS540 – APRIL 2007 Table 5. Phase Noise Parameters With LVCMOS Input of 31.2500 MHz and LVPECL Output at 125.00 MHz PARAMETER MIN TYP MAX UNIT Phase Noise Specifications Under Following Conditions: fin = 31.2500 MHz, fout = 125.00 MHz phn100 Phase noise at 100 Hz –108 dBc/Hz phn1K Phase noise at 1 kHz –118 dBc/Hz phn10k Phase noise at 10 kHz –127 dBc/Hz phn100k Phase noise at 100 kHz –130 dBc/Hz phn1M Phase noise at 1 MHz –139 dBc/Hz phn10M Phase noise at 10 MHz –147 dBc/Hz phn20M Phase noise at 20 MHz –147 dBc/Hz JRMS RMS jitter integrated from 12 kHz to 20 MHz Tj Total jitter Dj Deterministic jitter 529 fs 47.47 ps 25.2 ps Table 6. Phase Noise Parameters With LVCMOS Input of 31.2500 MHz and LVPECL Output at 156.25 MHz PARAMETER MIN TYP MAX UNIT Phase Noise Specifications Under Following Conditions: fin = 31.2500 MHz, fout = 156.25 MHz phn100 Phase noise at 100 Hz –106 dBc/Hz phn1K Phase noise at 1 kHz –117 dBc/Hz phn10k Phase noise at 10 kHz –126 dBc/Hz phn100k Phase noise at 100 kHz –128 dBc/Hz phn1M Phase noise at 1 MHz –139 dBc/Hz phn10M Phase noise at 10 MHz –147 dBc/Hz phn20M Phase noise at 20 MHz –147 dBc/Hz JRMS RMS jitter integrated from 12 kHz to 20 MHz Tj Total jitter Dj Deterministic jitter 472 fs 31.54 ps 9.12 ps Table 7. Phase Noise Parameters With LVCMOS Input of 35.4167 MHz and LVPECL Output at 212.50 MHz PARAMETER MIN TYP MAX UNIT Phase Noise Specifications Under Following Conditions: fin = 35.4167 MHz, fout = 212.50 MHz 6 phn100 Phase noise at 100 Hz –105 dBc/Hz phn1K Phase noise at 1 kHz –115 dBc/Hz phn10k Phase noise at 10 kHz –119 dBc/Hz phn100k Phase noise at 100 kHz –123 dBc/Hz phn1M Phase noise at 1 MHz –135 dBc/Hz phn10M Phase noise at 10 MHz –148 dBc/Hz phn20M Phase noise at 20 MHz –148 dBc/Hz JRMS RMS jitter integrated from 12 kHz to 20 MHz Tj Dj 512 fs Total jitter 33.96 ps Deterministic jitter 13.78 ps Submit Documentation Feedback CDC421xxx www.ti.com SLAS540 – APRIL 2007 Table 8. Phase Noise Parameters With LVCMOS Input of 31.2500 MHz and LVPECL Output at 250.00 MHz PARAMETER MIN TYP MAX UNIT Phase Noise Specifications Under Following Conditions: fin = 31.2500 MHz, fout = 250.00 MHz phn100 Phase noise at 100 Hz –103 dBc/Hz phn1K Phase noise at 1 kHz –112 dBc/Hz phn10k Phase noise at 10 kHz –121 dBc/Hz phn100k Phase noise at 100 kHz –124 dBc/Hz phn1M Phase noise at 1 MHz –134 dBc/Hz phn10M Phase noise at 10 MHz –148 dBc/Hz phn20M Phase noise at 20 MHz –149 dBc/Hz JRMS RMS jitter integrated from 12 kHz to 20 MHz Tj Dj 420 fs Total jitter 36.98 ps Deterministic jitter 18.52 ps Table 9. Phase Noise Parameters With LVCMOS Input of 31.2500 MHz and LVPECL Output at 312.50 MHz PARAMETER MIN TYP MAX UNIT Phase Noise Specifications Under Following Conditions: fin = 31.2500 MHz, fout = 312.50 MHz phn100 Phase noise at 100 Hz –102 dBc/Hz phn1K Phase noise at 1 kHz –111 dBc/Hz phn10k Phase noise at 10 kHz –120 dBc/Hz phn100k Phase noise at 100 kHz –123 dBc/Hz phn1M Phase noise at 1 MHz –135 dBc/Hz phn10M Phase noise at 10 MHz –147 dBc/Hz phn20M Phase noise at 20 MHz –147 dBc/Hz JRMS RMS jitter integrated from 12 kHz to 20 MHz Tj Total jitter Dj Deterministic jitter Submit Documentation Feedback 378 fs 29.82 ps 11 ps 7 IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. 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