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: 0.1Ω
♦ 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