LTC6990

1

6990f

TYPICAL APPLICATION

DESCRIPTION

TimerBlox: Voltage

Controlled Silicon Oscillator

grammable frequency range of 488Hz to 2MHz. 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 devices.

nal master oscillator frequency. The output frequency

is determined by this master oscillator and an internal

from 1 to 128.

1MHz

• 50kΩ

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 selection of

the two resistors.

The 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 low.

The LTC6990 is available in the 6-lead SOT-23 (ThinSOT)

package or a 6-lead 2mm

× 3mm DFN.

Voltage Controlled Oscillator with 16:1 Frequency Range

L, LT, LTC and LTM, Linear Technology and the Linear logo are registered trademarks of

Linear Technology Corporation. TimerBlox and ThinSOT are trademarks of Linear Technology

Corporation. All other trademarks are the property of their respective owners. Protected by U.S.

Patents including 6342817, 6614313.

FEATURES

APPLICATIONS

– Fixed: Single Resistor Programs Frequency

with <2.2% Max Error

– VCO: Two Resistors Set VCO Center

Frequency and Tuning Range

and 2mm

× 3mm DFN Package

VCO Transfer Function

0

1000

750

250

500

0

0.5

6990 TA01b

2

1

1.5

6990 TA01a

LTC6990

OE

GND

SET

OUT

DIV

C1

0.1μF

100k

100k

MHz

V