INTRODUCTION
The MC145192EVK and MC145202EVK are two versions of one board with a few component changes. They allow users to exercise features of both devices and to build PLLs which meet individual performance requirements. The control program works with any board and can be used with other Motorola PLL devices (MC145190, MC145191, MC145200, MC145201, MC145220*). It will select frequency defaults that apply to each. All board functions are controlled through the printer port of an IBM PC. Up to three different EVKs may be controlled at the same time from one printer port. The functional block diagram is given in Figure 1.

This manual is divided into two sections. Section 1 describes the hardware and Section 2 covers the software control program.

FEATURES
1. The EVK is a complete working synthesizer, including VCO.
2. Control program is written in Turbo Pascal.
3. Board is controlled by an IBM PC–compatible computer through the printer port.
4. Up to three boards can be operated independently through one printer port.
5. A prototype area and mounting holes are provided for VCOs, mixers, and amplifiers.
6. External reference input can be used.
7. Five element loop filter is included.
8. Frequency range of operation, step size and reference frequency can be changed in the control program.
9. Lock Detect, Out A, and Out B on any single board are accessible through the printer port.