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MC33591 数据表(PDF) 4 Page - Motorola, Inc |
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MC33591 数据表(HTML) 4 Page - Motorola, Inc |
4 / 28 page RECEIVER FUNCTIONAL DESCRIPTION 4 MC33591 Technical Data MOTOROLA RECEIVER FUNCTIONAL DESCRIPTION The basic functionality of the ROMEO2 receiver may be seen by reference to the accompanying block diagram (see figure 1). It is fully compatible with the TANGO3 transmitter. The RF section comprises a mixer with image cancelling, followed by an IF band-pass filter at 660kHz, an AGC controlled gain stage and OOK/FSK demodulators, the desired modulation type being selectable by the SPI interface. The data output from the circuit may either be the data comparator output, or, if Data Manager is enabled, the SPI port. The local oscillator is controlled with a PLL referenced to the crystal oscillator. The received channel is defined by the choice of the crystal frequency. An SPI bus permits programming the modulation type, data rate, UHF frequency, ID word etc., though to accomodate applications where no bus interface is available the circuit defaults at power-on to a standard operating mode. Depending upon the configuration, the circuit can be either externally strobed by the STROBE input or internally wait-and-sleep cycled to reduce the power consumption. At any time, a high level on STROBE overrides the internal timer output and wakes up ROMEO2. When the circuit is switched into sleep mode its current consumption is approximately 100µA. The circuit configuration which has previously been programmed is retained. THE LOCAL OSCILLATOR PLL The PLL is tuned by comparing the local oscillator frequency, after suitable division, with that of the crystal oscillator reference. The loop filter has been integrated in the IC. Practical limits upon the values of components which may be integrated mean that the local oscillator performance may be slightly improved by using an external PFD filter, shown in Figure 2. In this way the user may choose to have optimum performance with the addition of external filter components. The PLL gain may be programmed by bit PG: it is recommended that this bit be set to 1, corresponding to low loop gain. Figure 2 : External loop filter C1=4.7nF, C2=390pF, R=1k W Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
类似零件编号 - MC33591 |
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类似说明 - MC33591 |
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