FDI Hz to 20 khz Resistor Programmable. 14 Pin DIP Quadrature Oscillator. Description

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Arnold Dickerson
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1 Description The Model FDI443 Precision has two outputs that are 90 out of phase with each other. The output frequency of the FDI443 is programmable using two resistors or two resistors and two capacitors. It can be set to any frequency from (and may work as low as 0.00 Hz). The FDI443 also has one uncommitted Op Amp that can be used in any way the user wishes. It is packaged in a small 4pin DIP package and works from noncritical ± Volt to ±8 Volt power supplies. The FDI443 will work very similar to the now discontinued Texas Instruments* (BurrBrown*) 443P Precision. We recommend that the user test any implementation before placing large orders. Features/Benefits: Sine and Cosine Output Outputs Wide Frequency range: 0. Hz to 0 khz Low Distortion: 0.% (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 BurrBrown are registered trademarks of their respective companies.

2 Electrical Characteristics Specifications typical at 5 C and ±5 VDC power supply. Parameter Test Conditions FDI443 Min. Typ. Max. Units Frequency Initial frequency No Adjustment khz Using two resistor only 0 khz Frequency ange Using two resistors and two capacitors 0.0 0k Hz Accuracy of Frequency Equation ± ±5 % Stability vs Temperature () ±50 ±00 ppm/ C Quadrature Phase Error ±0. degrees Distortion Sine output (pin ) 0.Hz to 5kHz 0. % 5kHz to 0kHz 0.5 % Cosine Output (pin ) 0.Hz to 5kHz 0. % 5kHz to 0kHz 0.8 % Distortion vs Temperature 0.05 %/ C Output At 0kHz Vrms Amplitude (sine) vs Temperature 0.05 %/ C vs Supply 0.4 V/V Output Current 0 ma Output Impedance Ω Uncommitted Op Amp Input Offset Voltage. mv Input Bias Current 0 pa Input Impedance 0 Ω Output Impedance Ω Unity Gain Bandwidth 8 0 MHz Output Current 0 ma Power Supply ated Supply Voltage ±5 V Supply Voltage ange ± ±8 V Quiescent Current ±9 ±5 ma Temperature ange Specified 0 0 C Storage 55 5 C

3 FDI443 Typical Circuit Pin 4 Pin 5 Pin 6 Pin Pin 4 Pin 3 Pin Pin Pin 0 Pin Pin 3 Pin Pin 9 Pin 8 Terminal Functions Terminal Terminal Description Name No. Name No. E Sine Output 8 Frequency Adjustment Frequency Adjustment Vcc 9 5VDC 3 Frequency Adjustment Vcc 0 5VDC In 4 Uncommitted Op amp Com Ground In 5 Uncommitted Op amp Frequency Adjustment Output 6 Uncommitted Op amp 3 Frequency Adjustment E Cosine Output 4 Frequency Adjustment 3

4 External Connections 0 khz The FDI443 does not require and external components to obtain a 0 khz quadrature oscillation. The connection diagram is shown in Figure. 0. 5V 5V 0. Programmable to 0.0 Hz For oscillation frequencies below 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. 0 9 SINE () Where f is in Hz, C is in µfd, and is in KΩ. Figure 8 COSINE Alternately you can select a capacitance using Figure 4 and calculate the resistance required using Equation 3. For resistor programmable frequencies in the khz to 0 khz frequency range the connection diagram is provided in Figure. Note that only two resisters of equal value are required. esistor values are found using Equation. Where is in KΩ, f is in Hz, and C is in µfd. 0. 5V 5V 0. () 0 9 SINE Where is in KΩ and f is in khz. 0. 5V 5V C COSINE 0 9 SINE C 8 3 COSINE Figure 3 Figure 4

5 ecommended 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 External Capacitors khz to 0 khz 00 Hz to khz 0 Hz to 00 Hz Hz to 0 Hz 0. Hz to Hz 0.0 Hz to 0. Hz µfd 0. µfd µfd 0 µfd 00 µfd Figure 4 ecommended Capacitor Types The FDI443 will only work with nonpolarized capacitors with Dissipation Factors of less than 0.0 (or %). 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 betweens pins 3 and 4 of the FDI443. 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 00 KΩ. Method two is similar to method one but the resistor is inserted only during start up of the oscillation. For instance if a KΩ resistor in series with a push button is installed between pins 3 and 4 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 to start oscillating. Placing a resistor between pins 3 and 4 can cure this problem. For instance a 34KΩ resistor can be used in the 0. Hz to Hz range. Uncommitted Op Amp Pins 4, 5, and 6 of the FDI443 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 FDI443 should be connected to power supply ground. 5

6 FDI "(max) Side View 0.30"(max) 0.00"(dia) 0.30"(typ) 0.5"(min) 0.85"(max) Side View 0.3"(max) 0.0" (typ) 0.30"(max) Bottom View 0.46"(max) "(max) All dimensions are in inches All case dimensions ± 0.0" 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. 6

D61 Series. 32-Pin DIP 4 - Pole Filters Hz to 1.00 Hz Fixed Frequency

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