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MC13122 Fiches technique(PDF) 7 Page - Motorola, Inc |
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MC13122 Fiches technique(HTML) 7 Page - Motorola, Inc |
7 / 28 page MC13027 MC13122 7 MOTOROLA ANALOG IC DEVICE DATA Figure 4. MC13027 Internal Block Diagram 20 19 18 17 16 15 14 13 12 11 123 456 789 10 WB AGC Amp Mixer IF Amp NB Amp VCC ÷4 RF Time MV AF Del MV AF Time MV X1 Reg X1 WB AGC In Blanker AGC Feedback 4.0 V Reg RF Gnd Mixer In Blanker RF In 4.0 Filter VCC VCO LO Out WB AGC Out Audio Blank Time Audio Blank Pulse Audio Blank Delay Time IF Out RF Blank Time IF In Gnd2 RF Blank Mixer Out MC13027 FUNCTIONAL DESCRIPTION The MC13027 contains the mixer, wide band AGC system, local oscillator, IF pre–amplifier and noise blanker for an AM radio receiver. It is designed to be used with the MC13122 to produce a complete AM stereo receiver. The VCO runs at 4 (Fin+FIF) and is divided internally by 4 for the mixer input and local oscillator buffered output. Dividing the VCO reduces the phase noise for AM stereo applications. The noise blanker input is connected in parallel with the mixer input at Pin 6. The noise blanker circuitry contains a high gain amplifier with its own AGC so it remains linear throughout the mixer’s linear range. It can detect noise pulses as low as 120 µV and generates three pulses when the noise threshold is exceeded. The width and timing of the blanking pulses is set by the resistors connected to Pins 15, 17 and 19. The resistor on Pin 15 sets the length of the RF blanking pulse and determines the time the transistor on Pin 12 is “on”. The audio blanking pulse delay is set by the resistor on Pin 17 and the width by the resistor on Pin 19. This is necessary because the IF filtering delays and stretches the noise as it arrives at the detector. The transistor on Pin 18 goes “on” to cause noise blanking in the track and hold circuit in the MC13122 (Pin 15). Wideband AGC is used in auto receivers to prevent overload – it drives the base of a cascode transistor RF amplifier and also a pin diode at the antenna (See Figures 6 and 7). A low gain IF amplifier between Pins 14 and 16 is used as a buffer amplifier between the mixer output filter and IF filter. The input resistance of the IF amplifier is designed to match a ceramic IF filter. The gain of the IF amplifier is determined by the impedance of the load on Pin 16. |
Numéro de pièce similaire - MC13122 |
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Description similaire - MC13122 |
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