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LM1865 Scheda tecnica(PDF) 1 Page - National Semiconductor (TI) |
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LM1865 Scheda tecnica(HTML) 1 Page - National Semiconductor (TI) |
1 / 16 page TLH7509 February 1995 LM1865 Advanced FM IF System General Description Reduced external component cost improved performance and additonal functions are key features to the LM1865 FM IF system The LM1865 is designed for use in electronically tuned radio applications It contains both deviation and sig- nal level stop circuitry in addition to an open-collector stop output The LM1865 generates a reverse AGC voltage (ie decreasing AGC voltage with increasing signal) Features Y On-chip buffer to provide gain and terminate two ce- ramic filters Y Low distortion 01% typical with a single tuned quadra- ture coil for 100% modulation Y Broad off frequency distortion characteristic Y Low THD at minimum AFT offset Y Meter output proportional to signal level Y Stop detector with open-collector output Y Adjustable signal level mutestop threshold controlled either by ultrasonic noise in the recovered audio or by the meter output Y Adjustable deviation mutestop threshold Y Separate time constants for signal level and deviation mutestop Y Dual threshold AGC eliminates need for localdistance switch and offers improved immunity from third order in- termodulation products due to tuner overload Y User control of both AGC thresholds Y Excellent signal to noise ratio AM rejection and system limiting sensitivity Block Diagram Order Number LM1865M or LM1865N See NS Package Number M20B or N20A TLH7509 – 1 FIGURE 1 C1995 National Semiconductor Corporation RRD-B30M115Printed in U S A |
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