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TDA1596T データシート(PDF) 5 Page - NXP Semiconductors |
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TDA1596T データシート(HTML) 5 Page - NXP Semiconductors |
5 / 20 page April 1991 5 Philips Semiconductors Product specification IF amplifier/demodulator for FM radio receivers TDA1596 FUNCTIONAL DESCRIPTION Limiter-amplifier This has five stages of IF amplification using balanced differential limiter-amplifiers with emitter-follower coupling. Decoupling of the stages from the voltage supply lines and an internal high-ohmic DC feed-back loop give a very stable IF performance. The amplifier gain is virtually independent from temperature changes. FM demodulator The demodulator is fully balanced and comprises two cross-coupled differential amplifiers. Quadrature detection of the FM signal is performed by feeding one differential amplifier directly from the limiter-amplifier output, and the other via an external 90 ° phase-shifting network. The demodulator has good stability and its zero cross-over shift is small. The bandwidth of the demodulator output is restricted to approximately 1 MHz by an internal low-pass filter. THD compensation This circuit compensates non-linearities introduced by demodulation. For this to operate correctly the demodulator circuit between pins 9 and 10 must have a loaded Q-factor of 19. Consequently there is no need for the demodulator tuned circuit to be adjusted for minimum THD, instead the adjustment criterium is for a symmetrical stop pulse. Mute attenuator and AF output The control voltage for the mute attenuator at pin 14 is generated from the values of the level detector and the detuning detector outputs. The mute attenuator has a fast attack and a slow decay which is determined by the capacitor at pin 14. The AF signal is passed via the mute attenuator to the output at pin 4. A weighted control voltage, available from pin 6, is obtained from the mute attenuator control voltage via a buffer-amplifier which introduces an additional voltage shift and gain. Level detector The level detector generates a voltage output which is proportional to the field strength of the input signal. The unweighted level detector output is available when the mode switch is operating in the FM, mute-on condition. Tuning-stop outputs The open collector outputs STOP-0 and STOP-1 (from pins 13 and 12 respectively) are voltages derived from the detuning level and the field strength of the input signal. If only one tuning-stop output is required, pins 12 and 13 may be tied together. |
同様の部品番号 - TDA1596T |
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同様の説明 - TDA1596T |
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