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MC12148 Fiches technique(PDF) 1 Page - Motorola, Inc |
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MC12148 Fiches technique(HTML) 1 Page - Motorola, Inc |
1 / 5 page MC12148 SEMICONDUCTOR TECHNICAL DATA LOW POWER VOLTAGE CONTROLLED OSCILLATOR Order this document by MC12148/D 8 1 GND VCC 7 2 VCCO AGC 6 3 Out TANK 5 4 GND Vref Device Operating Temperature Range Package ORDERING INFORMATION MC12148D MC12148SD TA = – 40° to +85°C SO–8 SSOP–8 D SUFFIX PLASTIC PACKAGE CASE 751 (SO–8) 8 1 (Top View) PIN CONNECTIONS SD SUFFIX PLASTIC PACKAGE CASE 940 (SSOP–8) 8 1 Low Power Voltage Controlled Oscillator The MC12148 requires an external parallel tank circuit consisting of the inductor (L) and capacitor (C). A varactor diode may be incorporated into the tank circuit to provide a voltage variable input for the oscillator (VCO). This device may also be used in many other applications requiring a fixed frequency clock. The MC12148 is ideal in applications requiring a local oscillator. Systems include electronic test equipment and digital high–speed telecommunications. The MC12148 is based on the VCO circuit topology of the MC1648. The MC12148 has been realized utilizing Motorola’s MOSAIC III advanced bipolar process technology which results in a design which can operate at a much higher frequency than the MC1648 while utilizing half the current. Please consult with the MC1648 data sheet for additional background information. The ECL output circuitry of the MC12148 is not a traditional open emitter output structure and instead has an on–chip termination resistor with a nominal value of 500 ohms. This facilitates direct ac–coupling of the output signal into a transmission line. Because of this output configuration, an external pull–down resistor is not required to provide the output with a dc current path. This output is intended to drive one ECL load. If the user needs to fanout the signal, an ECL buffer such as the MC10EL16 Line Receiver/Driver should be used. NOTE: The MC12148 is NOT useable as a crystal oscillator. • Typical Operating Frequency Up to 1100 MHz • Low–Power 20 mA at 5.0 Vdc Power Supply • 8–Pin SOIC Package • Phase Noise –90 dBc/Hz at 25 kHz Typical © Motorola, Inc. 1997 Rev 5 BLOCK DIAGRAM (Typical Test Circuit) 7 86 5 2 13 4 GND VCCO Out GND VCC AGC TANK Vref 1200 Ω* Fout Vin 51K Ω 0.1 µF * The 1200 Ω resistor and the scope termination impedance constitute a 25:1 attenuator probe. 0.1 µF 0.01 µF 100 µF 0.1 µF 100 µF 0.01 µF 0.1 µF VCCO VCC = 4.5 to 5.5 V |
Numéro de pièce similaire - MC12148 |
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Description similaire - MC12148 |
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