ALFA RPAR AS3340A-DIL Voltage Controlled Oscillator (A Version) (DIL-16)

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The ALFA RPAR AS3340 is a completely self contained, precision voltage controlled oscillator featuring both exponential and linear control scales and up to four buffered output waveforms: triangle, sawtooth, square, and pulse with voltage controllable pulse width. It is pin-for-pin compatible with the CEM3340.

This version ("A" suffix) features improved frequencey stability against Vcc and Vee. Frequency stability can be improved if an external reference voltage (with level approximately 1/3 Vcc) is connected to pin 9 (Soft Sync). This version also has improved symmetry of rising and falling edge of triangle signal (approx. 50% over the original).

Full temperature compensation makes these VCOs extremely stable, and eliminates the need for a temperature compensation resistor. The highly accurate exponential and linear control inputs are virtual ground summing nodes, allowing multiple control voltages to be mixed within the device itself.

Also included is provision for hard and soft synchronization of the frequency, and an output for easy adjustment of high frequency tracking. Special care in the design ensures oscillation start-up under any power-on sequence and supply conditions. An on-chip 7.4 volt Zener diode allows the device to operate off ±15 volt supplies, as well as +15,-5 volt supplies. To minimize self-heating and improve thermo-stability it is recommended to keep VEE = -5V (external power supply).

Features

• Improved frequency stability
• Better symmetry of the triangle output
• CEM3340 replacement
• Large Sweep Range: 50,000:1 min
• Fully Temperature Compensated
• Four Output Waveforms Available; No waveform trimming required
• Summing Node Inputs for Frequency Control
• High Exponential Scale Accuracy
• Low Temperature Drift
• Voltage Controlled Pulse Width
• Hard and Soft Sync Inputs
• Linear FM
• Buffered, Short Circuit Protected Outputs
• ±15 Volt Supplies

Product Replacements

This device is replacement-compatible with original chips used in the following products. ^*

References