Programmable Low-Power Precision CMOS Oscillator

Transcription

1 DSC8 Series.8~.V Programmable LowPower Precision CMOS Oscillator General Description The DSC8 is a programmable silicon MEMS based CMOS oscillator offering excellent jitter and stability performance over a wide range of supply voltages and temperatures. The device operates from to 5MHz in increments of Hz (up to four decimal point resolution) with supply voltages between.8 to. Volts and extended temperatures from ºC to 5ºC. The DSC8 incorporates an all silicon resonator that is extremely robust and nearly immune to stress related fractures, common to crystal based oscillators. Without sacrificing the performance and stability required of today s systems, a crystalless design allows for a higher level of reliability, making the DSC8 ideal for rugged, industrial, and portable applications where stress, shock, and vibration can damage quartz crystal based systems. Available in industry standard packages, the DSC8 can be droppedin to the same PCB footprint as standard crystal oscillators. Block Diagram V DD Resonator (pin) PFD FracN PLL VCO GND Features Benefits Frequency Range: to 5MHz Exceptional Stability over Temperature o ± PPM, ±5 PPM, ±5 PPM Operating voltage o.7 to.6v Operating Temperature Range o Ext. Industrial ºC to 5ºC o Industrial ºC to 85ºC o Ext. Commercial ºC to 7ºC o Commercial ºC to 7ºC Low Operating and Standby Current o 5mA Operating (MHz) o 5uA Standby Ultra Miniature Footprint o.5 x. x.85 mm o. x.5 x.85 mm o 5. x. x.85 mm o 7. x 5. x.85 mm MILSTD 88 Shock and Vibration Resistant Pb Free, RoHS, Reach SVHC Compliant AECQ Reliability Qualified Pin for pin drop in replacement for industry standard oscillators Semiconductor level reliability, significantly higher than quartz Frequency Resolution to decimals Short mass production leadtimes Longer Battery Life / Reduced Power Compact Plastic package Cost Effective Applications Mobile Applications Consumer Electronics Portable Electronics DVR, CCTV, Surveillance Cameras Low Profile Applications Industrial Applications Page MKQBPD9

2 DSC8 Series.8~.V Programmable LowPower Precision CMOS Oscillator Absolute Maximum Ratings Item Min. Max Unit Condition Supply Voltage. +. V Input Voltage. VDD+. V Junction Temp +5 C Storage Temp C Soldering Temp +6 C sec max. ESD HBM MM CDM 5 V Ordering Code Family DSC8 Package, Temp & Stability CE * See Ordering Information for details T Tape/ Reel Recommended Operating Conditions Parameter Symbol Range Supply Voltage V DD.7.6V Load Z L R>KΩ, C 5pF Operating Temperature Option Option Option Option T to +5 C to +85 C to +7 C to +7 C Specifications (VDD =.8 to.v) T A =85 C unless otherwise specified Parameter Symbol Condition Min Typ Max Unit Frequency f Single Frequency 5 MHz Frequency Tolerance Δf Includes frequency variations due to initial tolerance, temperature and power supply voltage ±,±5,±5 ppm Aging Δf C ±5 ppm Supply Current, standby I DD T=5 C 5 ua Logic Levels logic high logic low V OH V OL ma ma.8*v DD.*V DD Startup Time t SU T=5 C.. ms Disable Time t DA ns Duty Cycle SYM 5 55 % Input Logic Levels Input logic high Input logic low V IH V IL.75*V DD.5* V DD Volts Volts Page MKQBPD9

3 DSC8 Series.8~.V Programmable LowPower Precision CMOS Oscillator VDD =.8v Parameter Symbol Condition Min Typ Max Unit MHz C L =p 7MHz Supply Current, no load I DD R L = 7MHz T=5 C ma 5MHz Transition time VDD =.5v VDD =.v t R t F C L =5pF; T=5 C %/8%*V DD Jitter, Max Cycle to Cycle J CC F = MHz 6 Ps Parameter Symbol Condition Min Typ Max Unit MHz C L =p 7MHz Supply Current, no load I DD R L = 7MHz T=5 C ma 5MHz Transition time t R t F C L =5pF; T=5 C %/8%*V DD Jitter, Max Cycle to Cycle J CC F = MHz 5 ps Parameter Symbol Condition Min Typ Max Unit Supply Current, no load I DD MHz C L =p 7MHz R L = 7MHz T=5 C ma 5MHz.8. Transition time t R C L =5pF; T=5 C. t F %/8%*V DD.9 ns Jitter, Max Cycle to Cycle J CC F = MHz 5 ps Notes:. Absolute maximum ratings are those values beyond which the safety of the device cannot be guaranteed. The device should not be operated beyond these limits.. t SU is time to stable output frequency after V DD is applied. t SU and t EN (after EN is asserted) are identical values.. Measured over 5k clock cycles ns ns Page MKQBPD9

4 (ns) (ns) (ns) (ns) Supply Current (ma) Supply Current (ma) DSC8 Series.8~.V Programmable LowPower Precision CMOS Oscillator Nominal Performance Characteristics 6 8 Vdd =.65V Ta = 5 C Supply Current pf 8pF 5pF 6 8 Vdd =.65V Ta = 5 C Supply Current pf 8pF 5pF.5 Vdd =.V C 5 C 85 C.5 Vdd =.V C 5 C 85 C Vdd =.8V C 5 C 85 C.5 Vdd =.8V C 5 C 85 C.5.5 Page MKQBPD9

5 DSC8 Series.8~.V Programmable LowPower Precision CMOS Oscillator Waveform t R t F 8% 5% % /f o t EN t DA VOH VOL Standby Function (pin ) Hi Level Open (no connect) Low Level (pin ) ON ON High Impedance Test Circuit I DD V DD.uF 5pF *V SD *VSD = Logic Level Input Page 5 MKQBPD9

6 Temperature ( C) DSC8 Series.8~.V Programmable LowPower Precision CMOS Oscillator Board Layout (recommended) Solder Reflow Profile 6 C 7 C C 5 C 5 C C/Sec Max. 68 Sec Pre heat 8 min max C/Sec Max. Sec 65 Sec Reflow 6C/Sec Max. Cool Time 6 C refer to JSTDC RampUp Rate ( C to Peak Temp) C/Sec Max. Preheat Time 5 C to C 68 Sec Time maintained above 7 C 65 Sec Peak Temperature 556 C Time within 5 C of actual Peak Sec RampDown Rate 6 C/Sec Max. Time 5 C to Peak Temperature 8 min Max. Package Dimensions 7. x 5. mm Plastic Package External Dimensions Recommended Land Pattern* 7.±. [.76±.] 5.8 [.].6 [.].6 [.].5 [.8]. [.87]. [.8] 5.8 [.] o o o o o o. [.55] # # 5.±. [.97±.].85±.5 [.±.] # #. [.55]. [.8]. [.7] No. Pin Terminal GND VDD. [.8]. [.55] *Note: The center pad is not connected internally and should be left unconnected or tied to GND. units: mm [inch] Page 6 MKQBPD9

7 DSC8 Series.8~.V Programmable LowPower Precision CMOS Oscillator 5. x. mm Plastic Package External Dimensions Recommended Land Pattern 5±. [.97±.].5 [.].5 [.]. [.8]. [.7]. [.]. [.8]. [.] # #.±. [.6±.] # #. [.7].9 [.5]. [.]. [.7].85±.5 [.±.] No. Pin Terminal GND VDD units: mm [inch]. x.5 mm Plastic Package External Dimensions Recommended Land Pattern.±.5 [.6±.]. [.8].9 [.5].9 [.5]. [.8]. [.9] CO.5 # #.5±.5 [.98±.] # #.9±.5 [.5±.].8±. [.±.]. [.8].9 [.5].85±.5 [.±.] No. Pin Terminal GND VDD units: mm [inch] Page 7 MKQBPD9

8 DSC8 Series.8~.V Programmable LowPower Precision CMOS Oscillator.5 x. mm Plastic Package External Dimensions Recommended Land Pattern.5±.5 [.98±.].65 [.65].65 [.65].7 [.8].7 [.8].85 [.] CO.5 # #.±.5 [.79±.] # #.65±.5 [.6±.].65±. [.6±.]. [.8].65 [.6].85±.5 [.±.] No. Pin Terminal GND VDD units: mm [inch] Ordering Information DSC8 PTS T Package (Plastic QFN) P=A: 7.x5.mm P=B: 5.x.mm P=C:.x.5mm P=D:.5x.mm PART NUMBERING GUIDE Temperature Stability Packing Option T=C: o ~ +7 o C T=E: o ~ +7 o C T=I: o ~ +85 o C T=L: o ~ +5 o C S=: ±5ppm S=: ±5ppm S=5: ±ppm Blank: Tubes T: Tape & Reel Disclaimer: Micrel makes no representations or warranties with respect to the accuracy or completeness of the information furnished in this data sheet. This information is not intended as a warranty and Micrel does not assume responsibility for its use. Micrel reserves the right to change circuitry, specifications and descriptions at any time without notice. No license, whether express, implied, arising by estoppel or otherwise, to any intellectual property rights is granted by this document. Except as provided in Micrel s terms and conditions of sale for such products, Micrel assumes no liability whatsoever, and Micrel disclaims any express or implied warranty relating to the sale and/or use of Micrel products including liability or warranties relating to fitness for a particular purpose, merchantability, or infringement of any patent, copyright or other intellectual property right. MICREL, Inc. 8 Fortune Drive, San Jose, California 95 USA Phone: + (8) 98 Fax: + (8) 7 hbwhelp@micrel.com Page 8 MKQBPD9