MC145200EVK 데이터 시트보기 (PDF) - Motorola => Freescale

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MC145200EVK

Evaluation Boards

Motorola => Freescale 

SUPPORT MATERIAL

To provide further information, the following documents are included:

1. Schematic diagram of ’190/191/200/201EVK.

2. Separate Bill of Materials for each board.

3. Parts layout diagram.

4. Mechanical drawing of board.

5. MC145190/191 and MC145200/201 data sheets.

6. Printer port diagram.

7. Typical signal plots for each type of EVK.

PRODUCTION TEST

After assembly is complete, the following alignment and test is performed on ’190 and ’191EVK (’200 and

’201EVK):

1. The control program is started in single board ’190EVK (’200EVK) mode.

2. L menu item is selected.

3. Power is applied to the board. DIP switch section 1 is closed circuit with all others being open

circuit.

4. After attaching computer cable, menu item I is selected.

5. Trim resistor VR1 is adjusted to obtain an output frequency at J8 of 740.999 – 741.001 MHz

(1481.998 – 1482.002 MHz).

6. Voltage at the control voltage test point is measured. It must be 2.8 – 3.6 V.

7. When testing more than 1 board, steps 3 – 6 are repeated.

If in step 5 it isn’t possible to obtain a signal on frequency, menu item P should be selected and the cor-

rect printer port address entered. Menu item I would then be selected to reload the data.

BOARD OPERATION

A computer is connected to the DB–25 connector J5. Data is output from the printer port. The printer card

is in slot 0 using the default address in the control program. Data is sent to the PLL device (U1) through

the DIP switch (S1), and 74HCT241 buffer (U5). A ’190/191/200/201 PLL has three output lines which

are routed through a 74LS126 line driver (U2) to the computer.

U5, the 74HCT241, provides isolation, logic translation and a turn–on delay for PLL input lines. Logic

translation is needed from the TTL levels on the printer port to the CMOS levels on the ’190/191 inputs.

Turn–on delay is used to ensure the power–on reset functions properly. The clock line to the PLL must be

held low during power up.

A 12 V power supply should be used to power the board at J6 (Augat 2SV–02 connector). The 2SV–02

will accept 18–24 AWG bare copper power leads. No tools are needed for connection. If power is proper-

ly connected, LED D2 will be lit.

Power passes from J6 to U3 (78M08 regulator) configured as an 8.5 V regulator. D1 increases output

voltage of the regulator by 0.6 V. In the ’190 and ’200 boards, 8.5 V is routed through J3 to the charge

pump supply, VCO, and RF amplifier. The ’191 and ’201 boards use 8.5 V to power the VCO and RF

amplifier. J3 is a cut–trace and jumper. If it is desired to power the 8.5 V circuits directly, the trace under

J3 can be cut, J3’s shorting plug is removed, and 8.5 V is applied through J7 (2SV03 power connector).

MOTOROLA

MC145190EVK

5

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