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ADVFC32KN Fiches technique(PDF) 7 Page - Analog Devices |
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ADVFC32KN Fiches technique(HTML) 7 Page - Analog Devices |
7 / 7 page REV. B –6– ADVFC32 Figure 6. High Noise Immunity Data Link OUTLINE DIMENSIONS Dimensions shown in inches and (mm). 14-Lead Plastic DIP (N-14) 14 17 8 PIN 1 0.795 (20.19) 0.725 (18.42) 0.280 (7.11) 0.240 (6.10) 0.100 (2.54) BSC SEATING PLANE 0.060 (1.52) 0.015 (0.38) 0.210 (5.33) MAX 0.022 (0.558) 0.014 (0.356) 0.160 (4.06) 0.115 (2.93) 0.070 (1.77) 0.045 (1.15) 0.130 (3.30) MIN 0.195 (4.95) 0.115 (2.93) 0.015 (0.381) 0.008 (0.204) 0.325 (8.25) 0.300 (7.62) TO-100 (H-10A) 0.250 (6.35) MIN 0.750 (19.05) 0.500 (12.70) 0.185 (4.70) 0.165 (4.19) REFERENCE PLANE 0.050 (1.27) MAX 0.019 (0.48) 0.016 (0.41) 0.021 (0.53) 0.016 (0.41) 0.045 (1.14) 0.010 (0.25) 0.040 (1.02) MAX BASE & SEATING PLANE 1 0.034 (0.86) 0.027 (0.69) 0.045 (1.14) 0.027 (0.69) 0.160 (4.06) 0.110 (2.79) 6 2 8 7 5 4 3 0.115 (2.92) BSC 9 10 0.230 (5.84) BSC 36° BSC The data link input voltage is changed in a frequency modulated signal by the first ADVFC32. A 42.2 k Ω input resistor and a 100 k Ω offset resistor set the scaling so that a 0 V input signal corresponds to 50 kHz, and a 10 V input results in the maximum output frequency of 500 kHz. A high frequency optocoupler is then used to transmit the signal across any common-mode volt- age potentials to the receiving ADVFC32. The optocoupler is not necessary in systems where common-mode noise is either very small or a constant low level dc voltage. In systems where common-mode voltage may present a problem, the connection between the two locations should be through the optocoupler; no power or ground connections need to be made. The output of the optocoupler drives an ADVFC32 hooked up in the F/V configuration. Since the reconstructed signal at Pin 10 has a considerable amount of carrier feedthrough, it is desir- able to filter out any frequencies in the carrier range of 50 kHz to 500 kHz. The frequency response of the F/V converter is only 3 kHz due to the pole made by the integrator, so a second 3 kHz filter will not significantly limit the bandwidth. With the simple one pole filter shown in Figure 6, the input to output 3 dB point is approximately 2 kHz, and the output noise is less than 15 mV. If a lower output impedance drive is needed, a two-pole active filter is recommended as an output stage. Although the F/V conversion technique used in this circuit is quite simple, it is also very limited in terms of its frequency response and output ripple. The frequency response is limited by the integrator time constant and while it is possible to decrease that time constant, either signal range or output ripple must be sacrificed. The performance of the circuit of Figure 6 is shown in the photograph below. The top trace is the input signal, the middle trace is the frequency-modulated signal at the opto- coupler’s output, and the bottom trace is the recovered signal at the output of the F/V converter. |
Numéro de pièce similaire - ADVFC32KN |
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Description similaire - ADVFC32KN |
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