Integrated Circuit - AS3340A, VCO, Alfa, 16-Pin Dip

Integrated Circuit - AS3340A, VCO, Alfa, 16-Pin Dip

Integrated Circuit - AS3340A, VCO, Alfa, 16-Pin Dip image 1
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The AS3340A is Alfa’s version of the CEM3340 IC. The AS3340A 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. 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 +12, -5 volt supplies. For voltages greater than -7.5 volts, a series current limiting resistor REE must be added between pin 3 and the negative supply. Its value is calculated as follows:
REE = (VEE - 7.4) / .008

To minimize self-heating and improve thermal-stability it is recommended to keep VEE = -5V (external power supply).

External VEE also minimizes current through GND and improves VCO stability. Scale1 and Scale2 pins are used for trimming of thermo-compensation circuit. Resistor RZ, connected to Scale 1 pin, should provide the same current as current (approx.. 100 uA) flowing in Scale2 pin determined by resistor RT = 5.72k. Rs , resistor connected to pin Scale, is intended to trim V/oct range. AS3340A is an improved version of AS3340. AS3340A has much more output frequency stability against Vcc and VEE . Frequency stability can be improved If external reference voltage (with level approximately ⅓ Vcc) is connected to pin 9 (Soft Sync. Input). AS3340A benefits from improved symmetry of rising and falling edge of triangle signal (approx.. 50%).

The AS3340A is available in a 16-pin DIP package.


  • Large Sweep Range: 500,000:1
  • 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
Item ID:
ALFA RPAR Part Number:
Product Measurements by Type
Exponential Scale Error, Trimmed0.05%
Exponential Scale Error, Untrimmed0.2%
Frequency Control Range500K:1
Hard Sync Input Resistance6.3 KΩ
Hard Sync Reference Voltage-1.4 V
Input Bias Current at Reference and Control Current Inputs200 nA
Max. Current through Any Pin±40 mA
Max. Operating Temperature Range- 25°C to 75°C
Max. Storage Temperature Range- 55°C to 120°C
Max. Voltage Between Frequency Control Pin or Reference Current Pin and GND Pin±6 V
Max. Voltage Between Multiplier Output Pin and GND Pin+6 V, -1 V
Max. Voltage Between VCC and GND Pins+18 V, -0,5 V
Max. Voltage Between VCC and VEE Pins+24 V, -0,5 V
Max. Voltage Between VEE and GND Pins-6 V, +0,5 V
Max Capacitor Charge/Discharge Current570 µA
Multiplier Gain Errors0.0005%/µA
Negative Supply Voltage Range (Current limiting resistor required for negative supplies greater than -6 volts)-4.5V to -18V
Offset Voltage at Reference and Control Current Inputs0 mV
Oscillator Drift±50 ppm
PWM Input Pin Current1.5 µA
PWM Input Voltage for 0% Pulse Width0 mV
PWM Input Voltage for 100% Pulse Width5 V
Positive Supply Current5 mA
Positive Supply Voltage Range+10V to +18V
Pulse Output Source Capability at +10V10 mA
Sawtooth Output Sink Capability800 µA
Sawtooth Waveform Lower Level0 mV
Sawtooth Waveform Upper Level10.0 V
Squarewave Output Levels-1.3 V
Tempco of Input Bias Currents0 ppm
Tempo Cancellation0 ppm
Triangle & Sawtooth Output Impedance100 Ω
Triangle Buffer Input Current0.3 nA
Triangle Output Sink Capability550 µA
Triangle Waveform Lower Level0 mV
Triangle Waveform Symmetry50%
Triangle Waveform Upper Level5.0 V
Packaging Information
Packaging Dimensions0.72 in. × 0.36 in. × 0.283 in.
Weight (Packaging)0.003 lbs.
PDF: DatasheetAll Models

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