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General Description

The MAX038 is a high-frequency, precision function generator producing accurate, high-frequency triangle, sawtooth, sine, square, and pulse waveforms with a minimum of external components. The output frequency can be controlled over a frequency range of 0.1Hz to 20MHz by an internal 2.5V bandgap voltage reference and an external resistor and capacitor. The duty cycle can be varied over a wide range by applying a ±2.3V control signal, facilitating pulse-width modulation and the generation of sawtooth waveforms. Frequency modulation and frequency sweeping are achieved in the same way. The duty cycle and frequency controls are independent.

Features

? 0.1Hz to 20MHz Operating Frequency Range

? Triangle, Sawtooth, Sine, Square, and Pulse Waveforms

? Independent Frequency and Duty-Cycle Adjustments

? 350 to 1 Frequency Sweep Range

? 15% to 85% Variable Duty Cycle

? Low-Impedance Output Buffer: 0.1?

? Low-Distortion Sine Wave: 0.75%

? Low 200ppm/°C Temperature Drift

Applications

Precision Function Generators

Voltage-Controlled Oscillators

Frequency Modulators

Pulse-Width Modulators

Phase-Locked Loops

Frequency Synthesizer

FSK Generator—Sine and Square Waves