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.

2 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. 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.

3 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.

4 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).

5 300 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. *Temperature grades are identified by a label on the shipping LT C Marketing for parts specified with wider operating temperature ranges.

6 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)

7 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 + )/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.

8 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. 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.

9 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. 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.

10 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)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 (%)