D45 Datasheet, PDF (2/3 Pages) Frequency Devices, Inc. – Sinewave Oscillator

D45 Series
Fixed Frequency
FIXED FREQUENCY OPERATION
The output signal frequency of each D45 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.
FINE FREQUENCY ADJUSTMENT (±5%)
For applications requiring a more accurate frequen-
cy setting, disconnect Pin T2 from ground. Connect
a Cermet potentiometer as shown in Fig. 1 for a
±5% frequency adjustment range.
Sinewave Oscillator
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 con-
ditions.
T3
METAL
FILM
R1
T3
CERMET
GND
(A)
GND
(B)
Figure 2
T1
CERMET
500 ohm
GND
Figure 1
AMPLITUDE ADJUSTMENT (1 to 20V p-p)
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.
450VO
R1(kΩ)=
4VS-3VO
Equation 1
VO = Output Voltage in V p-p
VS = 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 ampli-
tude range is 1 to 10Vp-p and the positive power
supply is +Vs = 15 Vdc. At maximum output voltage
(10V p-p) equation 1 becomes
450 (10)
R1(kΩ)=
4(15)-3(10)
for potentiometer R1 = 150kΩ.
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:
VO
VT3=
2
Equation 2
where Vo is the output voltage expressed in Vp-p, and
V_T3 is the dc control voltage applied to pin T3.
2
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