Fixed Frequency
D45 Series
Sinewave Oscillator
25 Locust St, Haverhill, Massachusetts 01830 Tel: 800/252-7074, 978/374-0761 FAX: 978/521-1839
e-mail: sales@freqdev.com Web Address: http://www.freqdev.com
Description
The D45 Series are fixed frequency sinewave oscil-
lators that deliver a single phase, high purity sinu-
soidal output. These fully finished devices can be
user specified to operate to any frequency between
100 Hz and 50.0 kHz.
Each D45 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 0.1% to 0.3% based on frequency, while the
peak-to-peak amplitude stability of any fixed level
selected is 0.002 dB/C.
Features/Benefits:
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.
Applications
Reference oscillator
Airborne equipment
Mobile equipment
Test Apparatus
Telemetry Systems
Distortion Testing
1
Fixed Frequency
D45 Series
Sinewave Oscillator
25 Locust St, Haverhill, Massachusetts 01830 Tel: 800/252-7074, 978/374-0761 FAX: 978/521-1839
e-mail: sales@freqdev.com Web Address: http://www.freqdev.com
2
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.
Figure 2
V
O
= Output Voltage in V p-p
V
S
= 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
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:
where Vo is the output voltage expressed in Vp-p, and
V
T3
is the dc control voltage applied to pin T3.
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.
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.
T1
500 ohm
GND
CERMET
T3
R1
GND
METAL
FILM
(A)
(B)
T3
GND
CERMET
450V
O
R1(k
)=
4V
S
-3V
O
Equation 1
450 (10)
R1(k
)=
4(15)-3(10)
for potentiometer R1 = 150k
.
V
O
V
T3
=
2
Equation 2
D45 Series
Pin-Out and Package Data
Ordering Information
Specifications
(25C and Vs 15 Vdc)
25 Locust St, Haverhill, Massachusetts 01830 Tel: 800/252-7074, 978/374-0761 FAX: 978/521-1839
e-mail: sales@freqdev.com Web Address: http://www.freqdev.com
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.
PR-00D45-03
3
Oscillation Frequency (fo)
Range
100 Hz to 50.0 kHz
Tolerance
1
1%
External Adjustment Range
5%
Frequency Stability
Temperature
0.02%/C
Supply/Output Amplitude Variation
0.01%/%
Output Characteristics
Amplitude
Preset
20V p-p 1%
Adjustment Range
2
1 to 20V p-p
Stability vs. Temperature
3
0.002 dB/C
Stability vs. Supply Voltage
4
0.1 dB/%
Drive Capacity
Output current @ 20V p-p
5
5mA pk
Output Resistance @ 20V p-p
<10
Distortion
6
Harmonic
100 Hz to 10.0 kHz:
0.1%
10.1 kHz to 25.0 kHz:
0.2%
25.1 kHz to 50.0 kHz:
0.3%
Noise
6
50Vrms
DC Power Supply (Vs)
Operating Voltage
15 Vdc
Operating Voltage Range
12 Vdc to 18 Vdc
Maximum Safe Voltage
18 Vdc
Quiescent Current
8 mA typ
12 mA max.
Temperature
Operating
-2
0 to +70C
Storage
-25 to +85C
Notes:
1. Externally adjusted to zero.
2. All models can deliver 6V p-p to 600 external load.
3. The amplitude stability of a resistively programmed unit is directly propor-
tional to the external programming resistor temperature coefficient.
4. The amplitude stability of a voltage programmed unit having the program-
ming 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 50.0 kHz.
D45-849 Hz
Oscillation Frequency
7
e.g., 849 Hz
25.0 kHz
50.0 kHz
Ordering Information
Side View
1.80
0.15 min.
0.30
Pins 0.025 dia.
TERMINAL KEY
V
OUT
Signal Output
T1
Fine Frequency Adjust
T2
Frequency Adjust Enable*
T3Output 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.
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