LTC6990 Datasheet PDF

●The LTC6990CS6#TRMPBF is a voltage controlled 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, RSET, programs the LTC6990"s internal master oscillator frequency. The output frequency is determined by this master oscillator and an internal frequency divider, NDIV, programmable to eight settings from 1 to 128. When the output is disabled, it is either held low or placed in a high impedance state as dictated by the Hi-Z bit value. When power is first applied to the LTC6990 the power-on reset (POR) circuit will initiate the start-up time. The OUT pin is floated (high-impedance) during this time.

● Fixed-frequency or voltage-controlled operation

● Single resistor programs fixed frequency with <1.5% maximum error

● Two resistors set VCO centre frequency and tuning range

● 488Hz to 2MHz Frequency range

● Single-supply operation

● 72µA Supply current at 100kHz

● 500µs Start-up time

● >300kHz VCO bandwidth at 1MHz

● CMOS logic output sources/sinks 20mA

● 50% Duty cycle square wave output

● Output enable (selectable low or Hi-Z when disabled)