FIXED FREQUENCY OPERATION
The output signal frequency of each DX45 Series sinewave oscillator is factory calibrated to within ±1% of the userspecified value. Independent of frequency setting, the output amplitude is preset to 20V pp.
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.
FINE FREQUENCY ADJUSTMENT (±5%)
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.
AMPLITUDE ADJUSTMENT (1 to 20V pp)
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 pp. Warning: Adjusting for outputs below 1Vpp 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 pp
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 10Vpp 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 V_{T3} to Pin T3. The output response is found from Equation 2, below:
Equation 2
where Vo is the output voltage expressed in Vpp, and
V_{T3} is the dc control voltage applied to pin T3.
