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Zakładka z wyszukiwarką danych komponentów |
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Zakładka z wyszukiwarką danych komponentów |
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MC145202EVK Arkusz danych(PDF) 5 Page - Motorola, Inc |
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MC145202EVK Arkusz danych(HTML) 5 Page - Motorola, Inc |
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5 / 48 page  MC145192EVK • MC145202EVK 5 MOTOROLA design simple, reduce noise, and reduce the quantity of traces susceptible to stray pickup. About 56 dB rejection of fundamental and 23 dB gain is provided by the harmonic filter amplifier. This allows the ’202 to lock at 1466 – 1486 MHz. A single VCO model is used for both boards. It is an internal Motorola part which is not sold for other applications. The ’192 operates at half the output frequency and step size of the ’202. This allows the same loop filter components to be used. RF is fed to the PLL chip Fin input through voltage dividers R14 and R10. These two resistors terminate the PLL chip RF input with 50 ohms and provide isolation. Both boards use a phase detector current of 2 mA. J1 and J2 are removable jumpers and cut traces. They are used as connection points for a current measurement of VPD or VCC. A potentiometer VR1 is used to set M2 (14.4 MHz TCXO) on frequency. COMPONENTS UNIQUE TO EACH EVK Components that are not the same on all EVKs are given in the following table: ’192EVK ’202EVK U1 MC145192 MC145202 R2 18 k Ω 3.9 k Ω R8 0 Ω Not Used C22 Not Used 1.0 pF J3 3 V 5 V EXTERNAL REFERENCE INPUT As shipped, all boards are configured for a 14.4 MHz TCXO (supplied). To use an external reference, disconnect J13 and connect J9. Use a reference signal at J10 which complies with data sheet require- ments. Then modify the reference frequency in the program main menu to reflect the changes made ( [F] menu item ). DATA TRANSFER FROM COMPUTER TO EVK To control the serial input EVK with the parallel printer port, a conversion is done. Printer cards are de- signed to output eight bits through eight lines. A bit mask is used to obtain the bit combination for the three required output lines (Data, Clock, Load). As bytes are sent to the printer card in sequence, it ap- pears to be a serial transfer. The printer port is used because data transfer using the serial port is much slower. A standard IBM PC can support a parallel port data rate of 4.77 MHz. IBM PCs and compatibles can accept up to three printer port cards. These ports are called LPT1, LPT2, and LPT3. Each printer card has jumpers or DIP switches on it to set a unique address. Two sets of addresses are in common use. One set applies to IBM PC XT, AT, and clones. The other is for the PS 2 line. To load data into the EVK, the correct address must be selected. The program default is $278, which is LPT1 in a clone. If $278 is not the address in use, it must be modified by entering the O menu item in the main menu. All allowed addresses given in hexadecimal are as follows: Label IBM PC and Clones PS 2 LPT1 278 3BC LPT2 378 378 LPT3 3BC 278 |
Podobny numer części - MC145202EVK |
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Podobny opis - MC145202EVK |
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