Oscillators > DX45

DX45 Series

Fixed Frequency


Pin-out and package data

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DX45 Series

Sinewave Oscillator





The DX45 Series are fixed frequency sinewave oscillators that deliver a single phase, high purity sinusoidal output. These fully finished devices can be user specified to operate to any frequency between 100 Hz and 50 kHz.

Each DX45 model includes provisions for the user to adjust the output amplitude over a 1 to 20 Vp-p range by external resistive or voltage programming. Over the full output range, total harmonic distortion is 0.02% (<-75 dB) based on frequency, while the peak-to-peak amplitude stability of any fixed level selected is 0.001 dB/°C.


  • Stable high purity sinewave output.
  • Compact 1.8"L x 0.8"W x 0.3"H minimizes board space requirements.
  • Adjustable output amplitude for applications requiring discrete or continuous output control.
  • Plug-in ready-to-use, reducing engineering design and manufacturing cycle time.


  • Reference oscillator
  • Airborne equipment
  • Mobile equipment
  • Test Apparatus
  • Telemetry Systems
  • Distortion Testing

The output signal frequency of each DX45 Series sinewave oscillator is factory calibrated to within ±1% of the user-specified value. Independent of frequency setting, the output amplitude is preset to 20V p-p.

To put the oscillator into operation, simply connect the power supply common, voltages (±Vs), and ground pin T2. Pin T2 must be connected to ground in this mode of operation.

For applications requiring a more accurate frequency setting, disconnect Pin T2 from ground. Connect a Cermet potentiometer as shown in Fig. 1 for a ±5% frequency adjustment range.

Figure 1.

For applications requiring either variable or lower level output signals, a single resistor or a dc control voltage can externally program the D45 output amplitude to any value between 1 and 20V p-p.
Warning: Adjusting for outputs below 1Vp-p will cause loss of the output signal.

  Discrete Resistive Programming: The method shown in Fig. 2 (A) provides continuous control of the output amplitude. For both methods, Equation 1 defines the value of R1 for the specific set of conditions.

Figure 2.


Equation 1.

Vo = Output Voltage in V p-p
Vs = B plus Supply Voltage

Continuous Resistive Programming: To determine the value of potentiometer R1 in Fig. 2 (B), simply insert the appropriate values into Equation 1.

Suppose for example, the required output amplitude range is 1 to 10Vp-p and the positive power supply is +Vs = 15 Vdc. Equation 1 becomes

or potentiometer R1 = 150kohm.

Voltage Programmable Amplitude: The output amplitude of the D45 can be voltage controlled by applying dc programming voltage VT3 to Pin T3. The output response is found from Equation 2, below:

Equation 2

where Vo is the output voltage expressed in Vp-p, and
T3 is the dc control voltage applied to pin T3.



(@ 25°C and Vs ±15 Vdc)

Oscillation Frequency (fo)
  • Range: 100 Hz to 50 kHz
  • Tolerance1: ±1%
  • External Adjustment Range: ±5%
  • Frequency Stability
    Temperature: 0.02%/°C
    Supply/Output Amplitude Variation: 0.005%/%

Output Characteristics

  • Preset: 20V p-p ±1%
  • Adjustment Range2: 1 to 20V p-p
  • Stability vs. Temperature3: 0.001 dB/°C
  • Stability vs. Supply Voltage4: <0.05 dB/%

Drive Capacity

  • Output current @ 20V p-p5: ±5mA pk
  • Output Resistance @ 20V p-p: <10 ohm


  • Harmonic (100Hz to 50 kHz): 0.02% (-75 dB)

  • Noise6 (100 Hz to 3X Osc. Freq.): 50µVrms
DC Power Supply (±Vs)
  • Operating Range: ± 15 Vdc
  • Operating Voltage Range:
    ± 10 Vdc to ± 18 Vdc
  • Maximum Safe Voltage: ± 18 Vdc
  • Quiescent Current:
    ± 8 mA typ.
    ± 12 mA max.


  • Operating: 0 to + 70°C
  • Storage: -25 to+85°C


  1. Externally adjusted to zero.
  2. All models can deliver 6V p-p to 600ohm external load.
  3. The amplitude stability of a resistively programmed unit is directly proportional to the external programming resistor temperature coefficient.
  4. The amplitude stability of a voltage programmed unit having the programming dc voltage applied to pin T3 is 0.1dB/%VT3.
  5. The output is short circuit protected.
  6. Distortion is primarily third harmonic. Specification is for resistive loading.
  7. How to Specify Oscillation Frequency:
    Oscillation frequencies are specified by attaching a three-digit frequency designator to the basic model number. Oscillation frequencies can range from 100 Hz to 100 kHz.

Pin-Out and Package Data




VOUT Signal Output
T1 Fine Frequency Adjust
T2 Frequency Adjust Enable*
T3 Output Amplitude Adjust
+Vs Power Supply Voltage, Positive
GND Ground
-Vs Supply Voltage, Negative

*Must be connected to ground when fine frequency adjustment is not required.

Ordering Information

We hope the information given here will be helpful. The information is based on data and our best knowledge, and we consider the information to be true and accurate. Please read all statements, recommendations or suggestions herein in conjunction with our conditions of sale which apply to all goods supplied by us. We assume no responsibility for the use of these statements, recommendations or suggestions, nor do we intend them as a recommendation for any use which would infringe any patent or copyright.

Frequency Devices, Inc.
Your engineering partner for signal conditioning
  927 Fosse Rd
Ottawa, IL 61350

e-mail: sales@freqdev.com


Phone: (815) 434-7800

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