LTC6990 TimerBlox: Voltage Controlled Silicon Oscillator FEATURES DESCRIPTION n Fixed-Frequency or Voltage-Controlled Operation The LTC 6990 is a precision silicon oscillator with a pro- Fixed: Single Resistor Programs Frequency grammable frequency range of 488Hz to 2MHz. It can be with <1.5% Max Error used as a fixed-frequency or voltage-controlled oscillator VCO: Two Resistors Set VCO Center (VCO). The LTC6990 is part of the TimerBlox family of Frequency and Tuning Range versatile silicon timing devices. n Frequency Range: 488Hz to 2MHz A single resistor, R , programs the LTC6990s internal SET n 2.25V to 5.5V Single Supply Operation master oscillator frequency. The output frequency is deter- n 72A Supply Current at 100kHz mined by this master oscillator and an internal frequency n 500s Start-Up Time divider, N , programmable to eight settings from 1 to 128. DIV n VCO Bandwidth >300kHz at 1MHz n CMOS Logic Output Sources/Sinks 20mA 1MHz 50k f = ,N = 1, 2, 4 128 OUT DIV n 50% Duty Cycle Square Wave Output N R DIV SET n Output Enable (Selectable Low or Hi-Z When Disabled) Optionally, a second resistor at the SET input provides n 55C to 125C Operating Temperature Range linear voltage control of the output frequency and can be n Available in Low Profile (1mm) SOT-23 (ThinSOT) used for frequency modulation. A narrow or wide VCO and 2mm 3mm DFN Package tuning range can be configured by the appropriate selec- tion of the two resistors. APPLICATIONS n Low Cost Precision Programmable Oscillator The LTC6990 includes an enable function that is synchro- n Voltage-Controlled Oscillator nized with the master oscillator to ensure clean, glitch-free n High Vibration, High Acceleration Environments output pulses. The disabled output can be configured to n Replacement for Fixed Crystal and Ceramic Oscillators be high impedance or forced low. n Portable and Battery-Powered Equipment For easy configuration of the LTC6990, download the L, LT, LTC and LTM, Linear Technology, TimerBlox and the Linear logo are registered TimerBlox Designer tool at www.linear.com/timerblox. trademarks and ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents, including 6342817, 6614313. TYPICAL APPLICATION Voltage Controlled Oscillator with 16:1 Frequency Range VCO Transfer Function 1000 MHz + f = 1MHz V 0.5 OUT CTRL V V 750 OE OUT LTC6990 + V 500 + GND V C1 R VCO 0.1F 100k V 250 CTRL SET DIV 6990 TA01a R SET 100k 0 0 0.5 1 1.5 2 V (V) CTRL 6990 TA01b 6990fc 1 For more information www.linear.com/LTC6990 f (kHz) OUTLTC6990 ABSOLUTE MAXIMUM RATINGS (Note 1) + Supply Voltage (V ) to GND ........................................6V Specified Temperature Range (Note 3) Maximum Voltage on Any Pin LTC6990C ................................................ 0C to 70C + ............................. (GND 0.3V) V (V + 0.3V) LTC6990I .............................................40C to 85C PIN Operating Temperature Range (Note 2) LTC6990H .......................................... 40C to 125C LTC6990C ............................................40C to 85C LTC6990MP ....................................... 55C to 125C LTC6990I .............................................40C to 85C Junction Temperature ........................................... 150C LTC6990H .......................................... 40C to 125C Storage Temperature Range ..................65C to 150C LTC6990MP ....................................... 55C to 125C Lead Temperature (Soldering, 10sec)....................300C PIN CONFIGURATION TOP VIEW TOP VIEW + 6 V 1 OUT OE 1 6 OUT 7 DIV 2 5 GND + GND 2 5 V SET 3 4 OE SET 3 4 DIV DCB PACKAGE S6 PACKAGE 6-LEAD (2mm 3mm) PLASTIC DFN 6-LEAD PLASTIC TSOT-23 T = 150C, = 64C/W, = 10.6C/W T = 150C, = 192C/W, = 51C/W JMAX JA JC JMAX JA JC EXPOSED PAD (PIN 7) CONNECTED TO GND, PCB CONNECTION OPTIONAL ORDER INFORMATION Lead Free Finish TAPE AND REEL (MINI) TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION SPECIFIED TEMPERATURE RANGE LTC6990CDCB TRMPBF LTC6990CDCB TRPBF LDWX 6-Lead (2mm 3mm) Plastic DFN 0C to 70C LTC6990IDCB TRMPBF LTC6990IDCB TRPBF LDWX 6-Lead (2mm 3mm) Plastic DFN 40C to 85C LTC6990HDCB TRMPBF LTC6990HDCB TRPBF LDWX 6-Lead (2mm 3mm) Plastic DFN 40C to 125C LTC6990CS6 TRMPBF LTC6990CS6 TRPBF LTDWW 6-Lead Plastic TSOT-23 0C to 70C LTC6990IS6 TRMPBF LTC6990IS6 TRPBF LTDWW 6-Lead Plastic TSOT-23 40C to 85C LTC6990HS6 TRMPBF LTC6990HS6 TRPBF LTDWW 6-Lead Plastic TSOT-23 40C to 125C LTC6990MPS6 TRMPBF LTC6990MPS6 TRPBF LTDWW 6-Lead Plastic TSOT-23 55C to 125C TRM = 500 pieces. *Temperature grades are identified by a label on the shipping container. Consult LTC Marketing for parts specified with wider operating temperature ranges. Consult LTC Marketing for information on lead based finish parts. For more information on lead free part marking, go to: