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MC13122 Fiches technique(PDF) 10 Page - Motorola, Inc |
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MC13122 Fiches technique(HTML) 10 Page - Motorola, Inc |
10 / 28 page MC13027 MC13122 10 MOTOROLA ANALOG IC DEVICE DATA MC13027 PIN FUNCTION DESCRIPTION Pin Name Internal Equivalent Circuit Description 1 WB AGC In VCC 1 3.3 V WB AGC In R2 15 k 20 k Wideband AGC Input The input impedance to the WB AGC detector is 15 k and is internally biased so it must be coupled through a capacitor. The threshold can be increased by adding a resistor in series with the input. The WB AGC begins at about 1.0 mV. In car radios, this input should be connected to the collector of the RF amplifier cascode stage through a resistor and capacitor. A 68 pF to ground will prevent undesired high frequency signals from activating the WB AGC and make the sensitivity more uniform across the band. 2 Blanker AGC 2 NB AGC D1 D2 Blanker AGC The capacitor to ground is the bypass for the noise blanker AGC circuit. The noise blanker can be disabled by grounding this pin. 10 µF is used in the application, but it can be changed to match the time constant of the main IF AGC in the MC13122, Pin 4. 3 Feedback 3 NB Feedback 11 k Blanker Feedback This pin is the dc feedback to the input stage of the wide band amplifier. 4 4.0 V Reg 4 7 4.0 V Reg 4.0 V Filter Buffer 4.0 V Regulator The 4.0 V regulator supplies low impedance bias to many of the circuits in the IC. It should be bypassed to a ground near Pin 5. 7 4.0 V Filt VCC 4.7 k Reg 4.0 V Filter The external capacitor works with internal 4.7 k to filter noise from the bandgap regulator. 5 Gnd 5 RF Gnd RF Ground This pin is the ground for the RF section, blanker RF, filters and all radio circuits except the IF. In the PCB layout, the ground pin should be used as the internal return ground in the RF circuits. 6 BlkRF/MixIn 6 11 Mixer Out Mixer/ Blanker In LO + VCC LO 50 Ω 50 Ω 50 Ω 50 Ω VCC 4.0 V Mixer Input/Blanker RF Input The blanker RF input must be biased from the 4.0 V on Pin 4. The mixer input is to two bases of the upper mixer transistors. A low impedance dc path to the 4.0 V on Pin 4 is required. Normally, this would be a coil secondary connected between Pins 6 and 4. 11 Mixer Out 750 LO– Mixer Output A single ended output of a double balanced mixer. A load resistor to supply is chosen to match the ceramic filter, typically 1.5 k to 1.8 k. Output current is 830 µA. |
Numéro de pièce similaire - MC13122 |
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Description similaire - MC13122 |
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