PDF AD9517-0 Data sheet ( Hoja de datos )

Número de pieza	AD9517-0
Descripción	12-Output Clock Generator
Fabricantes	Analog Devices
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Data Sheet 12-Output Clock Generator with Integrated 2.8 GHz VCO AD9517-0 FEATURES Low phase noise, phase-locked loop (PLL) On-chip VCO tunes from 2.55 GHz to 2.95 GHz External VCO/VCXO to 2.4 GHz optional 1 differential or 2 single-ended reference inputs Reference monitoring capability Automatic revertive and manual reference switchover/holdover modes Accepts LVPECL, LVDS, or CMOS references to 250 MHz Programmable delays in path to PFD Digital or analog lock detect, selectable 2 pairs of 1.6 GHz LVPECL outputs Each output pair shares a 1-to-32 divider with coarse phase delay Additive output jitter: 225 fs rms Channel-to-channel skew paired outputs of <10 ps 2 pairs of 800 MHz LVDS clock outputs Each output pair shares two cascaded 1-to-32 dividers with coarse phase delay Additive output jitter: 275 fs rms Fine delay adjust (Δt) on each LVDS output Each LVDS output can be reconfigured as two 250 MHz CMOS outputs Automatic synchronization of all outputs on power-up Manual output synchronization available Available in a 48-lead LFCSP APPLICATIONS Low jitter, low phase noise clock distribution 10/40/100 Gb/sec networking line cards, including SONET, Synchronous Ethernet, OTU2/3/4 Forward error correction (G.710) Clocking high speed ADCs, DACs, DDSs, DDCs, DUCs, MxFEs High performance wireless transceivers ATE and high performance instrumentation GENERAL DESCRIPTION The AD9517-01 provides a multi-output clock distribution function with subpicosecond jitter performance, along with an on-chip PLL and VCO. The on-chip VCO tunes from 2.55 GHz to 2.95 GHz. Optionally, an external VCO/VCXO of up to 2.4 GHz can be used. The AD9517-0 emphasizes low jitter and phase noise to maximize data converter performance, and it can benefit other applications with demanding phase noise and jitter requirements. FUNCTIONAL BLOCK DIAGRAM CP LF REFIN REF1 REF2 STATUS MONITOR VCO CLK DIVIDER AND MUXs DIV/Φ LVPECL DIV/Φ DIV/Φ DIV/Φ DIV/Φ DIV/Φ LVPECL Δt Δt LVDS/CMOS Δt LVDS/CMOS Δt SERIAL CONTROL PORT AND DIGITAL LOGIC AD9517-0 OUT0 OUT1 OUT2 OUT3 OUT4 OUT5 OUT6 OUT7 Figure 1. The AD9517-0 features four LVPECL outputs (in two pairs) and four LVDS outputs (in two pairs). Each LVDS output can be reconfigured as two CMOS outputs. The LVPECL outputs operate to 1.6 GHz, the LVDS outputs operate to 800 MHz, and the CMOS outputs operate to 250 MHz. For applications that require additional outputs, a crystal reference input, zero-delay, or EEPROM for automatic configuration at startup, the AD9520 and AD9522 are available. In addition, the AD9516 and AD9518 are similar to the AD9517 but have a different combination of outputs. Each pair of outputs has dividers that allow both the divide ratio and coarse delay (or phase) to be set. The range of division for the LVPECL outputs is 1 to 32. The LVDS/CMOS outputs allow a range of divisions up to a maximum of 1024. The AD9517-0 is available in a 48-lead LFCSP and can be operated from a single 3.3 V supply. An external VCO, which requires an extended voltage range, can be accommodated by connecting the charge pump supply (VCP) to 5 V. A separate LVPECL power supply can be from 2.5 V to 3.3 V (nominal). The AD9517-0 is specified for operation over the industrial range of −40°C to +85°C. 1 AD9517 is used throughout the data sheet to refer to all the members of the AD9517 family. However, when AD9517-0 is used, it refers to that specific member of the AD9517 family. Rev. E Document Feedback Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 ©2007–2013 Analog Devices, Inc. All rights reserved. Technical Support www.analog.com 1 page AD9517-0 Data Sheet SPECIFICATIONS Typical is given for VS = VS_LVPECL = 3.3 V ± 5%; VS ≤ VCP ≤ 5.25 V; TA = 25°C; RSET = 4.12 kΩ; CPRSET = 5.1 kΩ, unless otherwise noted. Minimum and maximum values are given over full VS and TA (−40°C to +85°C) variation. POWER SUPPLY REQUIREMENTS Table 1. Parameter VS VS_LVPECL VCP RSET Pin Resistor CPRSET Pin Resistor BYPASS Pin Capacitor Min 3.135 2.375 VS 2.7 Typ 3.3 4.12 5.1 220 Max 3.465 VS 5.25 10 Unit V V V kΩ kΩ nF Test Conditions/Comments 3.3 V ± 5% Nominally 2.5 V to 3.3 V ± 5% Nominally 3.3 V to 5.0 V ± 5% Sets internal biasing currents; connect to ground Sets internal CP current range, nominally 4.8 mA (CP_lsb = 600 µA); actual current can be calculated by CP_lsb = 3.06/CPRSET; connect to ground Bypass for internal LDO regulator; necessary for LDO stability; connect to ground PLL CHARACTERISTICS Table 2. Parameter VCO (ON-CHIP) Frequency Range VCO Gain (KVCO) Tuning Voltage (VT) Frequency Pushing (Open Loop) Phase Noise at 100 kHz Offset Phase Noise at 1 MHz Offset REFERENCE INPUTS Differential Mode (REFIN, REFIN) Input Frequency Input Sensitivity Self-Bias Voltage, REFIN Self-Bias Voltage, REFIN Input Resistance, REFIN Input Resistance, REFIN Dual Single-Ended Mode (REF1, REF2) Input Frequency (AC-Coupled) Input Frequency (DC-Coupled) Input Sensitivity (AC-Coupled) Input Logic High Input Logic Low Input Current Pulse Width High/Low Input Capacitance PHASE/FREQUENCY DETECTOR (PFD) PFD Input Frequency Antibacklash Pulse Width Min Typ Max Unit Test Conditions/Comments 2550 0.5 50 1 −105 −123 2950 VCP − 0.5 MHz MHz/V V MHz/V dBc/Hz dBc/Hz See Figure 15 See Figure 10 VCP ≤ VS when using internal VCO; outside of this range, the CP spurs may increase due to CP up/down mismatch f = 2800 MHz f = 2800 MHz 0 250 1.35 1.60 1.30 1.50 4.0 4.8 4.4 5.3 20 0 0.8 2.0 −100 1.8 2 250 1.75 1.60 5.9 6.4 250 250 0.8 +100 MHz mV p-p V V kΩ kΩ MHz MHz V p-p V V µA ns pF Differential mode (can accommodate single-ended input by ac grounding undriven input) Frequencies below about 1 MHz should be dc-coupled; be careful to match VCM (self-bias voltage) PLL figure of merit (FOM) increases with increasing slew rate (see Figure 14); the input sensitivity is sufficient for ac-coupled LVDS and LVPECL signals Self-bias voltage of REFIN1 Self-bias voltage of REFIN1 Self-biased1 Self-biased1 Two single-ended CMOS-compatible inputs Slew rate > 50 V/µs Slew rate > 50 V/µs; CMOS levels Should not exceed VS p-p This value determines the allowable input duty cycle and is the amount of time that a square wave is high/low Each pin, REFIN/REFIN (REF1/REF2) 100 MHz Antibacklash pulse width = 1.3 ns, 2.9 ns 45 MHz Antibacklash pulse width = 6.0 ns 1.3 ns Register 0x017[1:0] = 01b 2.9 ns Register 0x017[1:0] = 00b; Register 0x017[1:0] = 11b 6.0 ns Register 0x017[1:0] = 10b Rev. E \| Page 4 of 80 5 Page AD9517-0 Data Sheet Parameter CLK = 1 GHz, Output = 50 MHz Divider = 20 At 10 Hz Offset At 100 Hz Offset At 1 kHz Offset At 10 kHz Offset At 100 kHz Offset At 1 MHz Offset >10 MHz Offset Min Typ Max −124 −134 −142 −151 −157 −160 −163 Unit Test Conditions/Comments Input slew rate > 1 V/ns dBc/Hz dBc/Hz dBc/Hz dBc/Hz dBc/Hz dBc/Hz dBc/Hz CLOCK OUTPUT ABSOLUTE PHASE NOISE (INTERNAL VCO USED) Table 7. Parameter LVPECL ABSOLUTE PHASE NOISE VCO = 2.95 GHz; Output = 2.95 GHz At 1 kHz Offset At 10 kHz Offset At 100 kHz Offset At 1 MHz Offset At 10 MHz Offset At 40 MHz Offset VCO = 2.75 GHz; Output = 2.75 GHz At 1 kHz Offset At 10 kHz Offset At 100 kHz Offset At 1 MHz Offset At 10 MHz Offset At 40 MHz Offset VCO = 2.55 GHz; Output = 2.55 GHz At 1 kHz Offset At 10 kHz Offset At 100 kHz Offset At 1 MHz Offset At 10 MHz Offset At 40 MHz Offset Min Typ Max −47 −78 −104 −122 −140 −146 −49 −79 −105 −123 −141 −146 −51 −80 −106 −125 −142 −146 Unit Test Conditions/Comments Internal VCO; direct to LVPECL output dBc/Hz dBc/Hz dBc/Hz dBc/Hz dBc/Hz dBc/Hz dBc/Hz dBc/Hz dBc/Hz dBc/Hz dBc/Hz dBc/Hz dBc/Hz dBc/Hz dBc/Hz dBc/Hz dBc/Hz dBc/Hz Rev. E \| Page 10 of 80 11 Page

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