Fixed Frequency

D

X45 Series

Sinewave Oscillator

1784 Chessie Lane, Ottawa, IL 61350 • Tel: 800/252-7074, 815/434-7800 • FAX: 815/434-8176

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

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

output response is found from Equation 2, below:

where Vo is the output voltage expressed in Vp-p, and

FIXED FREQUENCY OPERATION

The output signal frequency of each D

X45 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

Equation 1

450 (10)

4(15)-3(10)

2

Equation 2