FS6128-01 PLL Clock Generator IC with VCXO AMERICAN MICROSYSTEMS, INC. April 2000 1.0 Features 2.0 • Phase-locked loop (PLL) device synthesizes output clock frequency from crystal oscillator or external reference clock • On-chip tunable voltage-controlled crystal oscillator (VCXO) allows precise system frequency tuning • Typically used for generation of MPEG-2 decoder clock • • 3.3V supply voltage Small circuit board footprint (8-pin 0.150″ SOIC) • Custom frequency selections available - contact your local AMI Sales Representative for more information Figure 1: Pin Configuration 1 VDD 2 XTUNE 3 VSS 4 FS6128 XIN 8 XOUT 7 VSS 6 n/c 5 CLK Description The FS6128 is a monolithic CMOS clock generator IC designed to minimize cost and component count in digital video/audio systems. At the core of the FS6128 is circuitry that implements a voltage-controlled crystal oscillator when an external resonator (nominally 13.5MHz) is attached. The VCXO allows device frequencies to be precisely adjusted for use in systems that have frequency matching requirements, such as digital satellite receivers. A high-resolution phase-locked loop generates an output clock (CLK) through a post-divider. The CLK frequency is ratiometrically derived from the VCXO frequency. The locking of the CLK frequency to other system reference frequencies can eliminate unpredictable artifacts in video systems and reduce electromagnetic interference (EMI) due to frequency harmonic stacking. Table 1: Crystal / Output Frequencies DEVICE fXIN (MHz) CLK (MHz) XTUNE Range FS6128-01 13.5 27 0-2 V NOTE: Contact AMI for custom PLL frequencies 8-pin (0.150″ ) SOIC Figure 2: Block Diagram XIN VCXO PLL DIVIDER CLK XOUT XTUNE FS6128 ISO9001 4.24.00 FS6128-01 PLL Clock Generator IC with VCXO AMERICAN MICROSYSTEMS, INC. April 2000 Table 2: Pin Descriptions Key: AI = Analog Input; AO = Analog Output; DI = Digital Input; DIU = Input with Internal Pull-Up; DID = Input with Internal Pull-Down; DIO = Digital Input/Output; DI-3 = Three-Level Digital Input, DO = Digital Output; P = Power/Ground; # = Active Low pin PIN TYPE NAME DESCRIPTION 1 AI XIN VCXO Feedback 2 P VDD Power Supply (+3.3V) 3 AI XTUNE 4 P VSS Ground 5 DO CLK Clock Output 6 - n/c No Connection 7 DO VSS 8 AO XOUT VCXO Tune Ground VCXO Drive 3.0 Functional Block Description 3.1 Phase-Locked Loop (PLL) The oscillator operates the crystal resonator in the parallel-resonant mode. Crystal warping, or the “pulling” of the crystal oscillation frequency, is accomplished by altering the effective load capacitance presented to the crystal by the oscillator circuit. The actual amount that changing the load capacitance alters the oscillator frequency will be dependent on the characteristics of the crystal as well as the oscillator circuit itself. Specifically, the motional capacitance of the crystal (usually referred to by crystal manufacturers as C1), the static capacitance of the crystal (C0), and the load capacitance (CL) of the oscillator determine the warping capability of the crystal in the oscillator circuit. A simple formula to obtain the warping capability of a crystal oscillator is: The on-chip PLL is a standard frequency- and phaselocked loop architecture. The PLL multiplies the reference oscillator to the desired frequency by a ratio of integers. The frequency multiplication is exact with a zero synthesis error. 3.2 Voltage-Controlled Crystal Oscillator (VCXO) The VCXO provides a tunable, low-jitter frequency reference for the rest of the FS6128 system components. Loading capacitance for the crystal is internal to the FS6128. No external components (other than the resonator itself) are required for operation of the VCXO. Continuous fine-tuning of the VCXO frequency is accomplished by varying the voltage on the XTUNE pin. The value of this voltage controls the effective capacitance presented by the VCXO to the crystal. When using a crystal with a VCXO, it is important that the crystal load capacitance (as specified in Table 4: Operating Conditions be matched to the load capacitance as presented by the VCXO. The crystal must be specified with the correct load capacitance to obtain the maximum tuning range. ISO9001 ∆f ( ppm) = 6 C1 × (C L 2 − C L1) × 10 2 × (C 0 + C L 2 ) × (C 0 + C L1) where CL1 and CL2 are the two extremes of the applied load capacitance. EXAMPLE: A crystal with the following parameters is used. With C1 = 0.02pF, C0 = 5pF, CL1 = 13pF, and CL2 =35pF, the coarse tuning range is ∆f = 0.02 × (35 − 13) × 106 ≈ 305 ppm . 2 × (5 + 35) × (5 + 13) 2 4.24.00 FS6128-01 PLL Clock Generator IC with VCXO AMERICAN MICROSYSTEMS, INC. April 2000 4.0 Electrical Specifications Table 3: Absolute Maximum Ratings Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. These conditions represent a stress rating only, and functional operation of the device at these or any other conditions above the operational limits noted in this specification is not implied. Exposure to maximum rating conditions for extended conditions may affect device performance, functionality, and reliability. PARAMETER Supply Voltage (VSS = ground) SYMBOL MIN. MAX. UNITS VDD VSS-0.5 7 V Input Voltage, dc VI VSS-0.5 VDD+0.5 V Output Voltage, dc VO VSS-0.5 VDD+0.5 V Input Clamp Current, dc (VI < 0 or VI > VDD) IIK -50 50 mA Output Clamp Current, dc (VI < 0 or VI > VDD) IOK -50 50 mA Storage Temperature Range (non-condensing) TS -65 150 °C Ambient Temperature Range, Under Bias TA -55 125 °C Junction Temperature TJ 125 °C Lead Temperature (soldering, 10s) 260 °C 2 kV Input Static Discharge Voltage Protection (MIL-STD 883E, Method 3015.7) CAUTION: ELECTROSTATIC SENSITIVE DEVICE Permanent damage resulting in a loss of functionality or performance may occur if this device is subjected to a high-energy electrostatic discharge. Table 4: Operating Conditions PARAMETER SYMBOL Supply Voltage VDD Ambient Operating Temperature Range TA Crystal Resonator Frequency fXTAL CONDITIONS/DESCRIPTION 3.3V ± 10% MIN. TYP. MAX. 3.0 3.3 3.6 V 70 °C 18 MHz 0 Fundamental Mode 5 13.5 UNITS Crystal Resonator Motional Capacitance C1(xtal) AT cut 25 fF Crystal Loading Capacitance CL(xtal) AT cut 20 pF ISO9001 3 4.24.00 FS6128-01 PLL Clock Generator IC with VCXO AMERICAN MICROSYSTEMS, INC. April 2000 Table 5: DC Electrical Specifications Unless otherwise stated, VDD = 3.3V ± 10%, no load on any output, and ambient temperature range TA = 0°C to 70°C. Parameters denoted with an asterisk ( * ) represent nominal characterization data and are not production tested to any specific limits. Where given, MIN and MAX characterization data are ± 3σ f rom typical. Negative currents indicate current flows out of the device. PARAMETER SYMBOL CONDITIONS/DESCRIPTION MIN. TYP. MAX. UNITS Overall Supply Current, Dynamic, with Loaded Outputs IDD fXTAL = 13.5MHz; CL = 10pF, VDD = 3.6V 30 mA Supply Current, Static IDD XIN = 0V, VDD = 3.6V 3 mA 20 pF Voltage Controlled Crystal Oscillator Crystal Loading Capacitance CL(xtal) As seen by a crystal connected to XIN and XOUT (@ VXTUNE = 1V) Crystal Resonator Motional Capacitance C1(xtal) AT cut 25 fF VCXO Tuning Range fXTAL = 13.5MHz; CL(xtal) = 20pF; C1(xtal) = 25fF 300 ppm VCXO Tuning Characteristic Note: positive change of XTUNE = positive change of VCXO frequency 150 ppm/V Crystal Drive Level RXTAL=20Ω; CL = 20pF 200 uW IOH VO = 2.0V -40 mA Clock Output (CLK) High-Level Output Source Current * Low-Level Output Sink Current * IOL VO = 0.4V 17 mA zOH VO = 0.1VDD; output driving high 25 zOL VO = 0.1VDD; output driving low 25 Ω Short Circuit Source Current * IOSH VO = 0V; shorted for 30s, max. -55 mA Short Circuit Sink Current * IOSL VO = 3.3V; shorted for 30s, max. 55 mA Output Impedance * ISO9001 4 4.24.00 FS6128-01 PLL Clock Generator IC with VCXO AMERICAN MICROSYSTEMS, INC. April 2000 Table 6: AC Timing Specifications Unless otherwise stated, VDD = 3.3V ± 10%, no load on any output, and ambient temperature range TA = 0°C to 70°C. Parameters denoted with an asterisk ( * ) represent nominal characterization data and are not production tested to any specific limits. Where given, MIN and MAX characterization data are ± 3σ f rom typical. PARAMETER SYMBOL CONDITIONS/DESCRIPTION MIN. TYP. MAX. UNITS Overall VCXO Stabilization Time * PLL Stabilization Time * tVCXOSTB tPLLSTB Synthesis Error From power valid 10 ms From VCXO stable 500 us (unless otherwise noted in Frequency Table) 0 ppm 55 % Clock Output (CLK) Ratio of high pulse width (as measured from rising edge to next falling edge at VDD/2) to one clock period Duty Cycle * 45 Jitter, Period (peak-peak) * tj(∆P) From rising edge to next rising edge at VDD/2, CL = 10pF 390 ps Jitter, Long Term (σy(τ )) * tj(LT) From 0-500µs at VDD/2, CL = 10pF compared to ideal clock source 155 ps Rise Time * tr VDD = 3.3V; VO = 0.3V to 3.0V; CL = 10pF 1.7 ns Fall Time * tf VDD = 3.3V; VO = 3.0V to 0.3V; CL = 10pF 1.7 ns ISO9001 5 4.24.00 FS6128-01 PLL Clock Generator IC with VCXO AMERICAN MICROSYSTEMS, INC. April 2000 5.0 Package Information Table 7: 8-pin SOIC (0.150") Package Dimensions 8 DIMENSIONS INCHES MILLIMETERS MIN. MAX. MIN. MAX. A 0.061 0.068 1.55 1.73 A1 0.004 0.0098 0.102 0.249 A2 0.055 0.061 1.40 1.55 B 0.013 0.019 0.33 0.49 C 0.0075 0.0098 0.191 0.249 D 0.189 0.196 4.80 4.98 E 0.150 0.157 3.81 3.99 e 0.050 BSC 0.230 0.244 5.84 6.20 h 0.010 0.016 0.25 0.41 L 0.016 0.035 0.41 0.89 0° 8° E H 1 ALL RADII: 0.005" TO 0.01" h x 45° B 7° typ. e 1.27 BSC H Θ R AMERICAN MICROSYSTEMS, INC. 0° A2 A D A1 BASE PLANE 8° C L θ SEATING PLANE Table 8: 8-pin SOIC (0.150") Package Characteristics PARAMETER SYMBOL Thermal Impedance, Junction to Free-Air 8-pin 0.150” SOIC ΘJA Lead Inductance, Self L11 CONDITIONS/DESCRIPTION TYP. UNITS Air flow = 0 m/s 110 °C/W Corner lead 2.0 Center lead 1.6 nH Lead Inductance, Mutual L12 Any lead to any adjacent lead 0.4 nH Lead Capacitance, Bulk C11 Any lead to VSS 0.27 pF ISO9001 6 4.24.00 FS6128-01 PLL Clock Generator IC with VCXO AMERICAN MICROSYSTEMS, INC. April 2000 6.0 Ordering Information Table 9: Device Ordering Codes ORDERING CODE DEVICE NUMBER PACKAGE TYPE OPERATING TEMPERATURE RANGE SHIPPING CONFIGURATION 11640-101 FS6128-01 8-pin (0.150”) SOIC (Small Outline Package) 0° C to 70° C (Commercial) Tape and Reel 11640-111 FS6128-01 8-pin (0.150”) SOIC (Small Outline Package) 0° C to 70° C (Commercial) Tubes 7.0 Revision Information DATE PAGE 4/24/00 5, 7 DESCRIPTION Fixed formatting errors Copyright © 2000 American Microsystems, Inc. Devices sold by AMI are covered by the warranty and patent indemnification provisions appearing in its Terms of Sale only. AMI makes no warranty, express, statutory implied or by description, regarding the information set forth herein or regarding the freedom of the described devices from patent infringement. AMI makes no warranty of merchantability or fitness for any purposes. AMI reserves the right to discontinue production and change specifications and prices at any time and without notice. AMI’s products are intended for use in commercial applications. Applications requiring extended temperature range, unusual environmental requirements, or high reliability applications, such as military, medical life-support or life-sustaining equipment, are specifically not recommended without additional processing by AMI for such applications. American Microsystems, Inc., 2300 Buckskin Rd., Pocatello, ID 83201, (208) 233-4690, FAX (208) 234-6796, WWW Address: http://www.amis.com E-mail: [email protected] ISO9001 7 4.24.00