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.

2 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. 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.

3 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 )

4 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 ..6 VMaximum Voltage on Any Pin ..(GND ) VPIN (V+ + )Operating Temper atur e Range (Note 2) LTC6990C.

5 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.

6 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.

7 *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)

8 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.

9 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.

10 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.