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LM3189N bảng dữ liệu(PDF) 1 Page - National Semiconductor (TI) |
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LM3189N bảng dữ liệu(HTML) 1 Page - National Semiconductor (TI) |
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1 / 8 page  TLH7960 April 1987 LM3189 FM IF System General Description The LM3189N is a monolithic integrated circuit that provides all the functions of a comprehensive FM IF system The block diagram of the LM3189N includes a three stage FM IF amplifierlimiter configuration with level detectors for each stage a doubly balanced quadrature FM detector and an audio amplifier that features the optional use of a muting (squelch) circuit The advanced circuit design of the IF system includes desir- able deluxe features such as programmable delayed AGC for the RF tuner an AFC drive circuit and an output signal to drive a tuning meter andor provide stereo switching log- ic In addition internal power supply regulators maintain a nearly constant current drain over the voltage supply range of a85V to a16V The LM3189N is ideal for high fidelity operation Distortion in an LM3189N FM IF system is primarily a function of the phase linearity characteristic of the outboard detector coil The LM3189N has all the features of the LM3089N plus additions The LM3189N utilizes the 16-lead dual-in-line plastic pack- age and can operate over the ambient temperature range of b 40 Cto a85 C Features Y Exceptional limiting sensitivity 12 mV typ at b3dB point Y Low distortion 01% typ (with double-tuned coil) Y Single-coil tuning capability Y Improved (S a N)N ratio Y Externally programmable recovered audio level Y Provides specific signal for control of inter-channel mut- ing (squelch) Y Provides specific signal for direct drive of a tuning me- ter Y On channel step for search control Y Provides programmable AGC voltage for RF amplifier Y Provides a specific circuit for flexible audio output Y Internal supply voltage regulators Y Externally programmable ON channel step width and deviation at which muting occurs Block Diagram TLH7960 – 1 All resistance values are in X L tunes with 100 pF (C) at 107 MHz Q0 j 75 (Toko No KACS K586HM or equivalent) C1995 National Semiconductor Corporation RRD-B30M115Printed in U S A |
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Mô tả tương tự - LM3189N |
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