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U2514B-AFN Datasheet(PDF) 8 Page - TEMIC Semiconductors |
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U2514B-AFN Datasheet(HTML) 8 Page - TEMIC Semiconductors |
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8 / 15 page  U2514B TELEFUNKEN Semiconductors Rev. A2, 04-Nov-96 Preliminary Information 8 (15) Functional Description FM The antenna signal is fed via a tuned RF-circuit to the integrated pre-stage which consists of a transistor grounded base circuit. To protect the prestage against overload, an automatic gain control (AGC) is included on the chip. Additional there is the possibility to extend the AGC control range by use of an external pin diode. For economic applications a hybrid-band pass filter can be used instead of a tuned RF-circuit. A tuned RF circuit on the collector is necessary for amplifying and filtering of the FM signal which is fed internally to the mixer. It consists of a double balanced Gilbert Cell. The LO signal is generated by an integrated oscillator. The buffered LO signal is used to drive a PLL. The IF-signal (10.7 MHz) is coupled out at the mixers output and fed via a ceramic filter to the demodulator. The demodulated AF signal is available at MPXOUT. AM The antenna signal is fed directly to the mixer. In order to ensure the level control which is necessary in the case of large signals, the generator resistance has to be higher than 25 k W. The LO signal is generated by an integrated oscillator. The buffered LO signal is used to drive the PLL. If the AM-search mode is required, the IF must be 455 kHz. The IF output signal is fed via a ceramic filter to the demodulator. The demodulated AF signal is available at MPXOUT. CTRLA By applying a control voltage at pin CTRLA the mode of the receiver can be selected. Mode 12593 Reception Search Mute 0.8 V 1.3 V VRef VCTRLA Figure 23. Search Mode The search-mode is selected by applying a control voltage less than 0.7 V at pin CTRLA. 0 10 20 30 40 50 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 VCTRLA ( V ) 12591 Figure 24. The search sensitivity can be chosen by varying of the control voltage in the range of 0 to 0.7 V. If the control voltage is 0 V, the highest sensitivity is achieved. Reception Mode In the reception-mode there is a possibility for muting by varying the control voltage in the range of 1.3 to 0.8 V. If the control voltage is 0.8 V, the highest mute depth is achieved. –50 –40 –30 –20 –10 0 10 0 0.4 0.8 1.2 1.6 2.0 VCTRLA ( V ) 12690 Figure 25. |
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