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MC13110A Datasheet(PDF) 14 Page - Motorola, Inc |
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MC13110A Datasheet(HTML) 14 Page - Motorola, Inc |
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14 / 68 page  MC13110A/B MC13111A/B 14 MOTOROLA ANALOG IC DEVICE DATA PIN FUNCTION DESCRIPTION (continued) Description Equivalent Internal Circuit (52 Pin QFP) Symbol/ Type Pin Description Equivalent Internal Circuit (52 Pin QFP) Symbol/ Type QFP–52 LQFP–48 30 26 RSSI VCC Audio 186 k 26 VCC RF VCC RF RSSI RSSI is the receive signal strength indicator. This pin must be filtered through a capacitor to ground. The capacitance value range should be 0.01 to 0.1 µF. This is also the input to the Carrier Detect comparator. An external R to ground shifts the RSSI voltage. 24 27 Q Coil Q Coil 27 VCC RF VCC RF A quad coil or ceramic discriminator connects this pin as part of the FM demodulator circuit. DC–couple this pin to VCC RF through the quad coil or the external resistor. 26 29 VCC RF VCC supply for RF receiver section (1st LO, mixer, limiter, demodulator). Proper supply filtering is needed on this pin too. 25 28 Lim Out Lim C1 31 VCC RF 28 VCC RF VCC RF VCC RF 53.5 k A quad coil or ceramic discriminator are connected to these pins as part of the FM demodulator circuit. A coupling capacitor connects this pin to the quad coil or ceramic discriminator as part of the FM demodulator circuit. This pin can drive coupling capacitors up to 47 pF with no deterioration in performance. 27 28 30 31 Lim C2 Lim C1 1 Lim Out Lim In 32 Lim C2 30 52 k 1.5 k IF amplifier/limiter capacitor pins. These decoupling capacitors should be 0.1 µF. They determine the IF limiter gain and low frequency bandwidth. 29 32 Lim In (Input) Lim C2 52 k Signal input for IF amplifier/limiter. Signals should be ac–coupled to this pin. The input impedance is 1.5 k Ω at 455 kHz. – 33 SGnd RF This pin is not connected internally but should be grounded to reduce potential coupling between pins. 31 34 Mix2 In (Input) Mix2 In 34 VCC RF VCC RF 3.0 k Mix2 In is the second mixer input. Signals are to be ac–coupled to this pin, which is biased internally to VCC RF. The input impedance is 2.8 k Ω at 455 kHz. The input impedance can be reduced by connecting an external resistor to VCC RF. |
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Similar Description - MC13110A |
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