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MC13030DW Arkusz danych(PDF) 8 Page - Motorola, Inc |
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MC13030DW Arkusz danych(HTML) 8 Page - Motorola, Inc |
8 / 16 page MC13030 8 MOTOROLA ANALOG IC DEVICE DATA PIN FUNCTION DESCRIPTION (continued) Pin No. Description Internal Equivalent Circuit 17 2.0 k 4.8 V 17 To SD Circuit IF Input The IF input impedance is 2.0 k to match most ceramic 455 or 450 kHz filters. For a ceramic filter requiring a 1.5 k load, a 5.6 k resistor in series with a 0.01 µF capacitor should be connected from Pin 17 to ground. 18 19 18 5.1 k 500 Crystal Oscillator Base The crystal oscillator is a simple Colpitts type, operating at a low current. The crystal should operate at 10.250 MHz for 450 kHz IF or 10.245 MHz for 455 kHz IF with a 20 pF load capacitance. The oscillator signal to the second mixer is coupled from Pin 18 through an emitter follower. If a synthesizer such as the Motorola MC145170 with a 15 bit programmable R counter is used, the 10.245 MHz crystal can be connected to the synthesizer, and a 200 mVpp oscillator signal from the synthesizer can be capacitively coupled to Pin 18, so only one crystal is needed. 19 Crystal Oscillator Emitter The capacitive divider from Pin 18 is connected as shown in the application circuits of Figures 10, 11, 12. 20, 21 20 21 51 V Mixer2 Output The maximum AC collector voltage is about 5.8 Vpp or 2.0 Vrms. The mixer conversion transconductance gc = 0.0046 mho. The load impedance should be selected so the mixer output does not overload before the input. 22 5.1 V To AGC Circuit 2.4 k 22 51 51 3.0 mA 3.7 V Mixer2 Input The input impedance is 2.4 k. A series R–C network from Pin 22 to ground or a resistor from the filter to Pin 22 can be used to properly match the filter. In most cases, a 10.7 MHz crystal filter can be connected to Pin 22 directly without any additional components. IP3 (third order intercept) at the input is 5.0 dBm (112 dB µ). To guarantee –50 dB IM3, the input level should not be greater than –20 dBm (87 dB µ) (22.7 mVrms). 23 23 6.5 V Vref Vref This is the main reference voltage for most of the circuits in the IC and should be bypassed with a 1.0 µF capacitor. 24, 25 VCO 24 5.1 V 25 Mixer1 Output The maximum collector voltage is about 5.8 Vpp or 2.0 Vrms. The mixer conversion transconductance gc = 0.0022. The load impedance should be selected so the mixer output does not overload before the input. |
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Podobny opis - MC13030DW |
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