Features

• Fixed-Frequency or Voltage-Controlled Operation
  – Fixed: Single Resistor Programs Frequency with <1.5% Max Error
  – VCO: Two Resistors Set VCO Center Frequency and Tuning Range
• Frequency Range: 488Hz to 2MHz
• 2.25V to 5.5V Single Supply Operation
• 72μA Supply Current at 100kHz
• 500μs Start-Up Time
• VCO Bandwidth >300kHz at 1MHz
• CMOS Logic Output Sources/Sinks 20mA
• 50% Duty Cycle Square Wave Output
• Output Enable (Selectable Low or Hi-Z When Disabled)
• –55°C to 125°C Operating Temperature Range
• Available in Low Profile (1mm) SOT-23 (ThinSOT™) and 2mm × 3mm DFN Package
• Click here to start your design with the LTC6990 Online Design Tool!

Typical Application

Description

The LTC®6990 is a precision silicon oscillator with a programmable 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.

A single resistor, R_SET, programs the LTC6990’s internal master oscillator frequency. The output frequency is determined by this master oscillator and an internal frequency divider, N_DIV, programmable to eight settings from 1 to 128.