DSC V Low-Power CMOS Oscillator

Transcription

1 DSC.V LowPower CMOS Oscillator General Description The DSC is a.v fixed frequency MEMS based PureSilicon Oscillator. It can be factory programmed to any frequency from to 5MHz. The DSC 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 DSC ideal for rugged, industrial, and portable applications where stress, shock, and vibration can damage quartz crystal based systems. Available in industry standard packages, the DSC can be droppedin to the same PCB footprint as standard crystal oscillators. Features Frequency Range: to 5MHz Exceptional Stability over Temperature o ±5 PPM, ±5 PPM Operating voltage o. to.6v Operating Temperature Range o Industrial ºC to 85ºC o Ext. Commercial ºC to 7ºC o Commercial ºC to 7ºC Low Operating and Standby Current o ma Operating (MHz) o ua 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 Excellent Shock and Vibration Resistance Lead Free, RoHS & Reach SVHC Compliant Block Diagram V DD Benefits Pin for pin drop in replacement for industry standard oscillators Semiconductor level reliability, significantly higher than quartz Short mass production leadtimes Longer Battery Life / Reduced Power Compact Plastic package Cost Effective Resonator (pin) PFD FracN PLL VCO Applications Mobile Applications Consumer Electronics Portable Electronics CCD Clock for VTR Cameras Low Profile Applications Industrial Page

2 DSC.V LowPower 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 DSC CE. T Family Package, Temp & Stability Freq. to 5MHz * See Ordering Information for details Tape/ Reel Recommended Operating Conditions Specifications Parameter Symbol Range Supply Voltage V DD..6V Load Z L R>KΩ, C 5pF Operating Temperature Option Option Option T +85 C +7 C +7 C Parameter Symbol Condition Min. Typ. Max. Unit Frequency f Single Frequency 5 MHz Frequency Tolerance Option Option Option Supply Current, no load Δf I DD C L =p R L = T=5 C C to +85 C C to +7 C C to +7 C to MHz to 8MHz 8 to 5MHz 5 to 5MHz ±5,±5 ±5,±5 ±5,±5 5 6 Supply Current, standby I DD T=5 C. ua Logic Levels logic high logic low Transition time Rise Time Fall Time V OH V OL t R t F C L =5pF C L =5pF; T=5 C %/8%*V DD.8*V DD.*V DD Startup Time t SU T=5 C.5 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 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.. See typical cycle to cycle jitter graph for frequency dependence....5* V DD Jitter, Cycle to Cycle J CC F = MHz 95 ps ppm ma Volts ns Volts Page

3 RMS Jitter (ps) Jitter (ps) Rise Time (ns) Fall Time (ns) Supply Current (ma) Standby Current (µa) DSC.V LowPower CMOS Oscillator Nominal Performance Characteristics.V Characteristics Supply Current Standby Current 6 Ta = 5 C pf 8pF 5pF.8 C 5 C 85 C Rise Time Fall Time.5 C 5 C 85 C.5 C 5 C 85 C Period Jitter Cycle to Cycle Jitter 5 C 5 5 C Page

4 DSC.V LowPower CMOS Oscillator Waveform t R t F VOH VOL /f o t EN t DA VIH VIL 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 Temperature ( C) DSC.V LowPower 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 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 VDD. [.8]. [.55] *Note: The center pad is not connected internally and should be left unconnected or tied to. Page 5

6 DSC.V LowPower CMOS Oscillator 5. x. mm Plastic Package Recommended Land Pattern 5±. [.97±.].5 [.].5 [.]. [.8]. [.7]. [.]. [.8]. [.] # #.±. [.6±.] # #. [.7].9 [.5]. [.]. [.7].85±.5 [.±.] No. Pin Terminal VDD. x.5 mm Plastic Package 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 VDD Page 6

7 DSC.V LowPower CMOS Oscillator.5 x. mm Plastic Package 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 VDD Ordering Information DSC PTS xxx.xxxx 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 Frequency Packing Option T=C: o ~ +7 o C T=E: o ~ +7 o C T=I: o ~ +85 o C S=: ±5ppm S=: ±5ppm XXX.XXXX ( decimal places) Blank: Tubes T: Tape & Reel Example: DSCCE.T The example part number above is a.mhz oscillator in Plastic.x.5mm package, with ±5ppm stability over an operating temperature of to +7 o C, shipped in Tape and Reel. The reel size (7 or diameter) will be determined by the factory based on quantity. 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 7