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MC12149D Scheda tecnica(PDF) 1 Page - LANSDALE Semiconductor Inc. |
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MC12149D Scheda tecnica(HTML) 1 Page - LANSDALE Semiconductor Inc. |
1 / 12 page www.lansdale.com Page 1 of 12 ML12149 Low Power Voltage Controlled Oscillator Buffer Legacy Device: Motorola MC12149 The ML12149 is intended for applications requiring high fre- quency signal generation up to 1300 MHz. An external tank circuit is used to determine the desired frequency of operation. The VCO is realized using an emmiter–coupled pair topology. The ML12149 can be used with an emitter PLL IC such as the Motorola ML12210 1.1 GHz Frequency Synthesizer to realize a complete PLL sub–system. The device is specified to operate over a voltage supply range of 2.7 to 5.5 V. It has a typical current consumption of 15 mA at 3.0 V which makes it attractive for battery operated handheld systems. NOTE: The ML12149 is NOT suitable as a crystal oscillator • Operated Up to 1.3 GHz • Space–Efficient 8–Pin SOIC Package • Low Power 15 mA Typical @ 3.0 V Operation • Supply Voltage of 2.7 to 5.5 V • Typical 900 MHz Performance –Phase Noise – 105 dBc/Hz @ 100 Khz Offset –Tuning Voltage Sensitivity of 20 MHz/V • Output Amplitude Adjustment Capability • Two High Drive Output with an Adjustable Range from –8.0 to –2.0 dBm • One Low–Drive Output for Interfacing to a Prescaler • Operating Temperature Range TA = –40 to 85°C The device has three high frequency outputs which make it attractive for transceiver applications which require both a transmit and receive local oscillator (LO) signal as well as a lower ampli- tude signal to drive the prescaler input of the frequency synthesiz- er. The outputs Q and QB are available for servicing the receiver IF and transmitter up–converter single–ended. In receiver applica- tions, the outputs can be used together if it is necessary to generate a differential signal for the receiver IF. Because the Q and QB out- puts are open collector, terminations to the VCC supply are required for proper operation. Since the outputs are complementa- ry, both outputs must be terminated even if only one is needed. The Q and QB outputs have a nominal drive level of –8dBm to conserve power. A level adjustment pin (CNTL) is available, which when tied to ground, boosts the nominal output levels to –2.0 dBm. A low power VCO output (Q2) is also provided to drive the prescaler input of the PLL. The amplitude of this signal is nomi- nally 500 mV which is suitable for most prescalers. External components required for the ML12149 are: (1) tank cir- cuit (LC network); (2) Inductor/capacitor to provide the termina- tion for the open collector outputs; and (3) adequate supply voltage bypassing. The tank circuit consists of a high–Q inductor and var- actor components. The preferred tank configuration allows the user to tune the VCO across the full supply range. VCO performance such as center frequency, tuning voltage sensitivity, and noise char- acteristics are dependent on the particular components and config- uration of the VCO tank circuit. SO 8 = -5P PLASTIC PACKAGE CASE 751 (SO–8) 1 8 CROSS REFERENCE/ORDERING INFORMATION MOTOROLA SO 8 MC12149D ML12149-5P LANSDALE PACKAGE Note: Lansdale lead free (Pb) product, as it becomes available, will be identified by a part number prefix change from ML to MLE. 8 1 Q2 VCC 7 2 Q CNTL 6 3 GND TANK 5 4 QB VREF (Top View) PIN CONNECTIONS Issue B |
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