8038CCPD Precision Waveform Generator

Overview

The 8038CCPD is a high-performance monolithic waveform generator integrated circuit designed and manufactured by Intersil Corporation. This versatile component generates precise sine, square, and triangle waveforms simultaneously with minimal external components. The device features excellent frequency stability and low distortion outputs, making it suitable for a wide range of test equipment and signal generation applications.

Key advantages of the 8038CCPD include its temperature stability, wide frequency range, and flexible duty cycle adjustment. The device operates across a broad supply voltage range while maintaining frequency independence from supply variations, due to its unique internal architecture where both currents and thresholds are direct linear functions of the supply voltage.

Features

• Exceptional Temperature Stability: Low frequency drift of only 250ppm/°C
• High-Quality Waveform Outputs:
  • 1% distortion for sine wave output
  • 0.1% linearity for triangle wave output
• Wide Frequency Range: Operates from 0.001Hz to 300kHz
• Adjustable Duty Cycle: Variable from 2% to 98%
• Versatile Output Levels: Compatible with TTL logic up to 28V
• Simultaneous Outputs: Generates sine, square, and triangle waves concurrently
• Simple Implementation: Requires only a few external components for operation

Applications

The 8038CCPD finds use in numerous applications across various industries:

• Test and Measurement Equipment:
  • Function generators
  • Signal sources for bench testing
  • Calibration equipment
• Audio Applications:
  • Tone generation
  • Musical instrument electronics
  • Sound synthesis
• Communications Systems:
  • Modulation circuits
  • Frequency-shift keying generators
• Industrial Controls:
  • Sensor excitation
  • Process control signal generation
• Educational and Laboratory Use: Ideal for electronics training and experimentation

Electrical Characteristics

Absolute Maximum Ratings

• Supply Voltage (V+ to V-): 36V
• Output Short-Circuit Duration: Continuous
• Operating Temperature Range: -55°C to +125°C
• Storage Temperature Range: -65°C to +150°C

Typical Operating Characteristics

• Frequency Drift: 250ppm/°C
• Sine Wave Distortion: 1% typical
• Triangle Wave Linearity: 0.1% typical
• Frequency Range: 0.001Hz to 300kHz
• Duty Cycle Range: 2% to 98% adjustable
• Output Voltage Swing: TTL compatible to 28V
• Power Supply Range: ±5V to ±15V dual supply or +10V to +30V single supply

Performance Characteristics

The 8038CCPD maintains consistent performance across its operating range. The frequency stability is particularly noteworthy, as it remains independent of supply voltage fluctuations due to the internal architecture where both the timing currents and threshold voltages track supply variations. This results in a highly stable output frequency that only requires compensation for temperature effects in the most demanding applications.

The device produces three simultaneous outputs with the following characteristics:

• Sine Wave: Low-distortion output achieved through piecewise linear approximation with internal shaping network
• Triangle Wave: High linearity output generated by precise internal current sources and mirrors
• Square Wave: Clean, fast edges with adjustable duty cycle through external potentiometer

Package Information

Physical Specifications

• Package Type: PDIP (Plastic Dual In-line Package) and CERDIP (Ceramic Dual In-line Package) options
• Pin Count: 14-pin configuration
• Package Dimensions:
  • PDIP: 19.3mm x 6.35mm body, 2.54mm pin spacing
  • CERDIP: 19.05mm x 6.35mm body, 2.54mm pin spacing
• Lead Material: Copper alloy
• Lead Finish: Matte tin or solder-dipped options available

Pin Configuration (Top View)

The 8038CCPD features the following pinout in PDIP and CERDIP packages:

• Pin 1: Sine Wave Output
• Pin 2: Sine Wave Adjustment
• Pin 3: Triangle Wave Output
• Pin 4: Duty Cycle/Frequency Adjustment
• Pin 5: External Timing Capacitor
• Pin 6: External Timing Capacitor
• Pin 7: Negative Power Supply (V-)
• Pin 8: Frequency Modulation Input
• Pin 9: Square Wave Output
• Pin 10: Timing Resistor Connection
• Pin 11: Timing Resistor Connection
• Pin 12: Positive Power Supply (V+)
• Pin 13: NC (No Connection)
• Pin 14: NC (No Connection)

Ordering Information

The 8038CCPD is available in different variants based on stability requirements and temperature ranges:

• 8038ACCPD: Standard stability, commercial temperature range (0°C to +70°C)
• 8038BCCPD: Improved stability, industrial temperature range (-25°C to +85°C)
• 8038CCCPD: High stability, military temperature range (-55°C to +125°C)

Design Considerations

External Component Selection

For optimal performance, careful selection of external components is required:

• Timing Capacitor: Use high-quality, low-leakage capacitors (film or NP0 ceramic recommended)
• Timing Resistors: Precision metal film resistors with 1% tolerance or better
• Sine Wave Adjustment: Requires careful trimming for lowest distortion
• Power Supply Decoupling: 0.1μF ceramic capacitors close to power pins

Thermal Management

While the 8038CCPD has good thermal characteristics, in high-frequency operation or elevated ambient temperatures, consider:

• Adequate PCB copper area for heat dissipation
• Proper ventilation in enclosure design
• Thermal relief for ceramic package versions in high-vibration environments

Reliability and Quality