LTC6990 - TimerBlox: Voltage Controlled Silicon …

1 LTC699016990fcFor more information APPLICATIONDESCRIPTIONT imerBlox: Voltage Controlled Silicon OscillatorThe LT C 6990 is a precision Silicon oscillator with a pro-grammable frequency range of 488Hz to 2 MHz. It can be used as a fixed-frequency or Voltage - Controlled oscillator (VCO). The LTC6990 is part of the TimerBlox family of versatile Silicon timing single resistor, RSET, programs the LTC6990 s internal master oscillator frequency. The output frequency is deter-mined by this master oscillator and an internal frequency divider, NDIV, programmable to eight settings from 1 to 128. fOUT=1 MHzNDIV 50k RSET, NDIV= 1, 2, 4 ..128 Optionally, a second resistor at the SET input provides linear Voltage control of the output frequency and can be used for frequency modulation. A narrow or wide VCO tuning range can be configured by the appropriate selec-tion of the two LTC6990 includes an enable function that is synchro-nized with the master oscillator to ensure clean, glitch-free output pulses.

2 The disabled output can be configured to be high impedance or forced easy configuration of the LTC6990 , download the TimerBlox Designer tool at Controlled Oscillator with 16:1 Frequency RangeL, LT, LT C and LT M, Linear Technology, TimerBlox and the Linear logo are registered trademarks and ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by Patents, including 6342817, Fixed-Frequency or Voltage - Controlled Operation Fixed: Single Resistor Programs Frequency with < Max Error VCO: Tw o Resistors Set VCO Center Frequency and Tuning Rangen Frequency Range: 488Hz to 2 MHzn to Single Supply Operationn 72 A Supply Current at 100kHzn 500 s Start-Up Timen VCO Bandwidth >300kHz at 1 MHzn CMOS Logic Output Sources/Sinks 20mAn 50% Duty Cycle Square Wave Outputn Output Enable (Selectable Low or Hi-Z When Disabled)n 55 C to 125 C Operating Temperature Rangen Available in Low Profile (1mm) SOT-23 (ThinSOT ) and 2mm 3mm DFN Packagen Low Cost Precision Programmable Oscillatorn Voltage - Controlled Oscillatorn High Vibration, High Acceleration Environmentsn Replacement for Fixed Crystal and Ceramic Oscillatorsn Portable and Battery-Powered EquipmentVCO Transfer FunctionVCTRL (V)0fOUT (kHz) TA01aLTC6990 OEGNDSETOUTV+ FRSET100kV+V+VCTRLRVCO100k fOUT=1 MHz VCTRL more information MAXIMUM RATINGSS upply Voltage (V+) to GND.

3 6 VMaximum Voltage on Any Pin ..(GND ) VPIN (V+ + )Operating Temper atur e Range (Note 2) LTC6990C .. 40 C to 85 C LTC6990I .. 40 C to 85 C LTC6990H .. 40 C to 125 C LTC6990MP .. 55 C to 125 C(Note 1)TOP VIEWOUTGNDOEV+DIVSETDCB PACKAGE6-LEAD (2mm 3mm) PLASTIC DFN4576321 TJMAX = 150 C, JA = 64 C/W, JC = C/W EXPOSED PAD (PIN 7) CONNECTED TO GND, PCB CONNECTION OPTIONALOE 1 GND 2 SET 36 OUT5 V+4 DIVTOP VIEWS6 PACKAGE6-LEAD PLASTIC TSOT-23 TJMAX = 150 C, JA = 192 C/W, JC = 51 C/WPIN CONFIGURATIONORDER INFORMATIONS pecified Temper atur e Range (Note 3) LTC6990C ..0 C to 70 C LTC6990I .. 40 C to 85 C LTC6990H .. 40 C to 125 C LTC6990MP .. 55 C to 125 CJunction Temper atur e ..150 CStorage Temper atur e Range .. 65 C to 150 CLead Temper atur e (Soldering, 10sec)..300 CLead Free FinishTAPE AND REEL (MINI)TAPE AND REELPART MARKING*PACKAGE DESCRIPTIONSPECIFIED TEMPERATURE RANGELTC6990 CDCB#TRMPBFLTC6990 CDCB#TRPBFLDWX6-Lead (2mm 3mm) Plastic DFN0 C to 70 CLTC6990 IDCB#TRMPBFLTC6990 IDCB#TRPBFLDWX6-Lead (2mm 3mm) Plastic DFN 40 C to 85 CLTC6990 HDCB#TRMPBFLTC6990 HDCB#TRPBFLDWX6-Lead (2mm 3mm) Plastic DFN 40 C to 125 CLTC6990CS6#TRMPBFLTC6990CS6#TRPBFLTDWW6 -Lead Plastic TSOT-230 C to 70 CLTC6990IS6#TRMPBFLTC6990IS6#TRPBFLTDWW6 -Lead Plastic TSOT-23 40 C to 85 CLTC6990HS6#TRMPBFLTC6990HS6#TRPBFLTDWW6 -Lead Plastic TSOT-23 40 C to 125 CLTC6990 MPS6#TRMPBFLTC6990 MPS6#TRPBFLTDWW6-Lead Plastic TSOT-23 55 C to 125 CTRM = 500 pieces.

4 *Temperature grades are identified by a label on the shipping LT C Marketing for parts specified with wider operating temperature ranges. Consult LT C Marketing for information on lead based finish more information on lead free part marking, go to: For more information on tape and reel specifications, go to: more information CHARACTERISTICSSYMBOLPARAMETERCONDITIONS MINTYPMAXUNITSfOUTO utput FrequencyRecommended Range: RSET = 50k to 800k Extended Range: RSET = 25k to 2000kHz kHz fOUTF requency Accuracy (Note 4)Recommended Range RSET = 50k to 800k l %Extended Range RSET = 25k to 800k l % fOUT/ TFrequency Drift Over Temperaturel C fOUT/ V+Frequency Drift Over SupplyV+ = to V+ = to %/VLong-Term Frequency Stability(Note 11)90ppm/ kHrPeriod Jitter (Note 10)NDIV = = %RMSNDIV = %RMSDuty CycleNDIV = 1, RSET = 25k to 800k NDIV > 1, RSET = 25k to 800kl l47 4850 5053 52% %BWFrequency Modulation fOUTkHztSFrequency Change Settling Time (Note 9)tMASTER = tOUT/NDIV6 tMASTER sAnalog InputsVSETV oltage at SET VSET/ TVSET Drift Over Temperaturel 75 V/ C VSET/ V+VSET Drift Over Supply 150 V/V VSET/ ISETVSET Droop with ISET 7 RSETF requency-Setting ResistorRecommended Range Extended Rangel l50 25800 800k k VDIVDIV Pin Voltagel0V+V VDIV/V+DIV Pin Valid Code Range (Note 5)Deviation from Ideal VDIV/V+ = (DIVCODE + )

5 /16l Pin Input Currentl 10nAPower SupplyV+Operating Supply Voltage Reset VoltageRSET = 25k to CurrentRL = , NDIV = 1, RSET = 50k V+ = V+ = l235 145283 183 A ARL = , NDIV = 1 RSET = 800k V+ = V+ = l71 59105 92 A ARL = , NDIV = 128, RSET = 50k V+ = V+ = l137 106180 145 A ARL = , NDIV = 128, RSET = 800k V+ = V+ = l66 56100 90 A A The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25 C. Test conditions are V+ = to , OE = V+, DIVCODE = 0 to 15 (NDIV = 1 to 128), RSET = 50k to 800k, RLOAD = 5k, CLOAD = 5pF unless otherwise more information CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25 C. Test conditions are V+ = to , OE = V+, DIVCODE = 0 to 15 (NDIV = 1 to 128), RSET = 25k to 800k, RLOAD = , CLOAD = 5pF unless otherwise 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device.

6 Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and 2: The LTC6990C is guaranteed functional over the operating temperature range of 40 C to 85 3: The LTC6990C is guaranteed to meet specified performance from 0 C to 70 C. The LTC6990C is designed, characterized and expected to meet specified performance from 40 C to 85 C but it is not tested or QA sampled at these temperatures. The LTC6990I is guaranteed to meet specified performance from 40 C to 85 C. The LTC6990H is guaranteed to meet specified performance from 40 C to 125 C. The LTC6990MP is guaranteed to meet specified performance from 55 C to 125 4: Frequency accuracy is defined as the deviation from the fOUT equation, assuming RSET is used to program the 5: See Operation section, Table 1 and Figure 2 for a full explanation of how the DIV pin Voltage selects the value of 6: The OE pin has hysteresis to accommodate slow rising or falling signals.

7 The threshold voltages are proportional to V+. Typical values can be estimated at any supply Voltage using VOE(RISING) V+ + 185mV and VOE(FALLING) V+ 7: To conform to the Logic IC Standard, current out of a pin is arbitrarily given a negative 8: Output rise and fall times are measured between the 10% and the 90% power supply levels with 5pF output load. These specifications are based on 9: Settling time is the amount of time required for the output to settle within 1% of the final frequency after a or 2x change in 10: Jitter is the ratio of the deviation of the period to the mean of the period. This specification is based on characterization and is not 100% I/OOE Pin Input Pin Input CurrentOE = 0V to V+l 10nAVIHHigh Level OE Pin Input Voltage (Note 6) V+VVILLow Level OE Pin Input Voltage (Note 6) V+VOUT Pin Hi-Z LeakageOE = 0V, DIVCODE 8, OUT = 0V to V+ 10 AIOUT(MAX)Maximum Output Current 20mAVOHHigh Level Output Voltage (Note 7)V+ = IOH = 1mA IOH = 16mAl VV+ = IOH = 1mA IOH = 10mAl VV+ = IOH = 1mA IOH = 8mAl VVOLLow Level Output Voltage (Note 7)V+ = IOL = 1mA IOL = 16mAl VV+ = IOL = 1mA IOL = 10mAl VV+ = IOL = 1mA IOL = 8mAl VtPDOutput Disable Propagation DelayV+ = V+ = V+ = 26 44ns ns nstENABLEO utput Enable TimeNDIV 2, tOUT = 1/fOUT NDIV 4, tMASTER = tOUT/NDIV tPD to tOUT tPD to 2 tMASTER s strOutput Rise Time (Note 8)V+ = V+ = V+ = ns nstfOutput Fall Time (Note 8)

8 V+ = V+ = V+ = ns nsLTC699056990fcFor more information PERFORMANCE CHARACTERISTICSVSET vs ISETVSET vs Supply VoltageVSET vs TemperatureFrequency Error vs RSETF requency Error vs Supply VoltageFrequency Error vs TemperatureV+ = , unless otherwise (k )FREQUENCY ERROR (%)6990 G014321 1 2 30 4101001000TA = 25 CGUARANTEED MAXOVER TEMPERATUREGUARANTEED MINOVER TEMPERATURETYPICAL MAX90% OF UNITSTYPICAL MINSUPPLY Voltage (V)FREQUENCY ERROR (%)6990 = 25 CRSET = 800kRSET = 200kRSET = 50kISET ( A)VSET (V)6990 + = = 25 CSUPPLY Voltage (V)VSET (V)6990 = 200kTA = 25 CTEMPERATURE ( C)VSET (V)6990 507550025 25100125 RSET = 200k3 TYPICAL PARTSTEMPERATURE ( C)ERROR (%)6990 50 252550010075125V+ = = 4 RSET = 50kRSET = 267kRSET = 800kELECTRICAL CHARACTERISTICSNote 11: Long-term drift of Silicon oscillators is primarily due to the movement of ions and impurities within the Silicon and is tested at 30 C under otherwise nominal operating conditions.

9 Long-term drift is specified as ppm/ kHr due to the typically nonlinear nature of the drift. To calculate drift for a set time period, translate that time into thousands of hours, take the square root and multiply by the typical drift number. For instance, a year is and would yield a drift of 266ppm at 90ppm/ kHr. Drift without power applied to the device may be approximated as 1/10th of the drift with power, or 9ppm/ kHr for a 90ppm/ kHr more information PERFORMANCE CHARACTERISTICSPeak-to-Peak Jitter vs FrequencyOE Threshold Voltage vs Supply VoltageSupply Current vs Frequency, 5 VSupply Current vs Frequency, Current vs OE Pin VoltageV+ = 3V, unless otherwise Resistance vs Supply VoltageFREQUENCY (kHz)POWER SUPPLY CURRNET ( A)6990 + = 5 VTA = 25 C 128 1 2 RECOMMENDED RANGEEXTENDED RANGEFREQUENCY (kHz)POWER SUPPLY CURRNET ( A)6990 + = = 25 CRECOMMENDED RANGEEXTENDED RANGE 128 1 2 VOE/V+ (%)POWER SUPPLY CURRENT ( A)6990 G1220010012575150175500604020801005V, OE RISINGTA = 25 CRSET = 800kDIVCODE = 75V, OE ,OE , OE FALLINGSUPPLY Voltage (V)OE PIN Voltage (V)6990 = 25 CPOSITIVE-GOINGNEGATIVE-GOINGFREQUENCY (kHz)JITTER (%P-P)

10 6990 = 25 CV+ = 5 VPEAK-TO-PEAK PERIODDEVIATION MEASUREDOVER 30sec INTERVALS 1 2 4 128 Typical VSET DistributionSupply Current vs Supply VoltageSupply Current vs TemperatureVSET (V)NUMBER OF UNITS6990 = 25 C2 LOTSDFN AND SOT-231416 UNITSSUPPLY Voltage (V)POWER SUPPLY CURRENT ( A)6990 G0525015010050200024356TA = 25 CRSET = 800k, 1 RSET = 800k, 128 RSET = 50k, 1 RSET = 50k, 2 RSET = 50k, 128 TEMPERATURE ( C)POWER SUPPLY CURRENT ( A)6990 G09250100501502000 507550025 , RSET = 800k, , RSET = 800k, , RSET = 50k, , RSET = 50k, , RSET = 50k, 128 SUPPLY Voltage (V)OUTPUT RESISTANCE ( )6990 G155025203545510153040024356TA = 25 COUTPUT SOURCING CURRENTOUTPUT SINKING CURRENTLTC699076990fcFor more information and Fall Time vs Supply VoltageOutput Disable Propagation Delay (tPD) vs Supply VoltageTYPICAL PERFORMANCE CHARACTERISTICSF requency ModulationFrequency ModulationTypical ISET Current Limit vs V+Typical Output WaveformSUPPLY Voltage (V)RISE/FALL TIME (ns)6990 = 25 CCLOAD = 5pFtRISEtFALLSUPPLY Voltage (V)PROPAGATION DELAY (ns)6990 G175020401030254515535024356TA = 25 CCLOAD = 5pFSUPPLY Voltage (V)ISET ( A)6990 G181000400800200600024356TA = 25 CSET PIN SHORTED TO GND20 s/DIV6990 G19 OUT2V/DIVOE2V/DIVV+ = = 2 RSET = 200k20 s/DIV6990 G20 OUT2V/DIVVCTRL2V/DIVfOUT50kHz/DIVV+ = , DIVCODE = 0 RSET = 200k, RVCO = 464kfOUT = 175kHz to 350kHz20 s/DIV6990 G21 OUT2V/DIVVCTRL2V/DIVfOUT50kHz/DIVV+ = , DIVCODE = 0 RSET = 200k, RVCO = 464kfOUT = 175kHz to 350kHzV+ = 3V, unless otherwise Frequency Error vs Time (Long-Term Drift)TIME (h)DELTA FREQUENCY (ppm)