Oscillators > 4423

4423 Series

Resistor Programmable Frequency

Specifications

Pin-out and package data

Ordering Information


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FDI-4423
14 Pin DIP
Quadrature Oscillator
 

Purchase

 

 

Description

The Model FDI-4423 Resistor Programmable Precision Quadrature Oscillator has two outputs that are 90 out of phase with each other.  The output frequency of the FDI-4423 is programmable using two resistors or two resistors and two capacitors.  It can be set to any frequency from 0.02 Hz to 20 kHz (and may work as low as 0.002 Hz).

The FDI-4423 also has one uncommitted Op Amp that can be used in any way the user wishes.  It is packaged in a small 14-pin DIP package and works from non-critical ±12 Volt to ±18 Volt power supplies.

The FDI-4423 will work very similar to the now discontinued Texas Instruments* (Burr-Brown*) 4423P Precision Quadrature Oscillator.  We recommend that the user test any implementation before placing large orders.

Features/Benefits:

  • Sine and Cosine Output.
  • Resistor Programmable Outputs.
  • Wide Frequency range: 0.2 Hz to 20 kHz
  • Low Distortion: 0.2% (-54 dB) up to 5 kHz
  • Easy Adjustments
  • Small Size: 0.85" x 0.46" box
 

Applications

  • Communication systems and electronics
  • Medical electronics equipment and research
  • Aerospace, navigation and sonar

* Texas Instruments and Burr-Brown are registered trademarks of their respective companies.  

Specifications

(@ 25°C and Vs ±15 Vdc)

Parameter

Test Conditions

FDI-4423

Units

Min.

Typ.

Max.

Frequency

Initial frequency

No Adjustment

20.0

21.0

22.0

kHz

Frequency Range

Using two resistor only

2

 

20

kHz

Using two resistors and two capacitors

0.02

 

20k

Hz

Accuracy of Frequency Equation

 

 

±1

±5

%

Stability vs Temperature (1)

 

 

±50

±100

ppm/°C

Quadrature Phase Error

 

 

±0.1

 

degrees

Distortion

Sine output (pin 1)

0.2Hz to 5kHz

 

 

0.2

%

5kHz to 20kHz

 

 

0.5

%

Cosine Output (pin 7)

0.2Hz to 5kHz

 

0.2

 

%

5kHz to 20kHz

 

0.8

 

%

Distortion vs Temperature

 

 

0.015

 

%/°C

Output

Amplitude (sine)

At 20kHz

6.5

7

7.5

Vrms

vs Temperature

 

0.05

 

%/°C

vs Supply

 

0.4

 

V/V

Output Current

 

 

 

20

mA

Output Impedance

 

 

1

 

ohm

Uncommitted Op Amp

Input Offset Voltage

 

 

1.1

 

mV

Input Bias Current

 

 

20

 

pA

Input Impedance

 

 

10

12

 

ohm

Output Impedance

 

 

1

 

ohm

Unity Gain Bandwidth

 

 

8

10

MHz

Output Current

 

 

 

20

mA

Power Supply

Rated Supply Voltage

 

 

±15

 

V

Supply Voltage Range

 

±12

 

±18

V

Quiescent Current

 

 

 ±9

±15

mA

Temperature Range

Specified

 

0

 

+70

°C

Storage

 

-55

 

+125

°C


Pin-Out and Package Data


FDI-4423 Typical Circuit

Terminal Functions

Terminal

Description

Terminal

Name

No.

Name

No.

E1

1

Sine Output

8

Frequency Adjustment

2

Frequency Adjustment

-Vcc

9

-15VDC

3

Frequency Adjustment

+Vcc

10

+15VDC

+In

4

Uncommitted Op amp

Com

11

Ground

-In

5

Uncommitted Op amp

12

Frequency Adjustment

Output

6

Uncommitted Op amp

13

Frequency Adjustment

E2

7

Cosine Output

14

Frequency Adjustment


External Connections

20 kHz Quadrature Oscillator

The FDI-4423 does not require and external components to obtain a 20 kHz quadrature oscillation.  The connection diagram is shown in Figure 1.

Figure 1

Resistor Programmable Quadrature Oscillator

For resistor programmable frequencies in the 2 kHz to 20 kHz frequency range the connection diagram is provided in Figure 2.  Note that only two resisters of equal value are required.  Resistor values are found using Equation 1.

   (1)

Where R is in KΩ and f is in kHz.

Figure 2

Quadrature Oscillator Programmable to 0.02 Hz

For oscillation frequencies below 2 kHz the addition of two resistors and two capacitors of equal value is required.  The connections of Figure 3 should be used.  The frequency of oscillation can be found using Equation 2.

           (2)

Where f is in Hz, C is in µFd, and R is in KΩ.

Alternately you can select a capacitance using Figure 4 and calculate the resistance required using Equation 3.

Where R is in KΩ, f is in Hz, and C is in µFd.

Figure 3


Recommended Capacitor Values

For best results use capacitor values shown in Figure 4 for each frequency range. It is important that the two capacitors be as close to the same value as possible.

Frequency

2 kHz to

20 kHz

200 Hz to

2 kHz

20 Hz to

200 Hz

2 Hz to

20 Hz

0.2 Hz to

2 Hz

0.02 Hz to

0.2 Hz

External Capacitors

0

0.01 µFD

0.1 µFD

1 µFD

10 µFD

100 µFD

Figure 4


Recommended Capacitor Types          

The FDI-4423 Quadrature Oscillator will only work with non-polarized capacitors with Dissipation Factors of less than 0.01 (or 1%).  Best results will be obtained using ceramic capacitors.

Oscillation Amplitude

Depending on the frequency it can take a long time to build up to the full output amplitude.  In general the lower the frequency the longer it takes the oscillation to start.

There are two methods that can be used to shorten the start up time:

Method one involves adding a large value resistor between pins 3 and 14 of the FDI-4423.  The lower this resistor the quicker the oscillation will start but the worse the distortion of the two outputs.  A typical value to try would be 100 KΩ.

Method two is similar to method one but the resistor is inserted only during start up of the oscillation.  For instance if a 1 KΩ resistor in series with a push button is installed between pins 3 and 14 and the button pushed during start up the oscillator will start quickly and then will revert to low distortion after the button is released.

Low Frequency Operation

At low frequencies there may be problems getting the Quadrature Oscillator to start oscillating.  Placing a resistor between pins 3 and 14 can cure this problem.  For instance a 34KΩ resistor can be used in the 0.2 Hz to 2 Hz range.

Uncommitted Op Amp

Pins 4, 5, and 6 of the FDI-4423 are connected to an Op amp that is available to be used.  It can be used as a buffer or gain stage.  If this Op Amp is not used then pins 4 and 5 of the FDI-4423 should be connected to power supply ground.


Package 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.


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