These devices are dual phase–locked loop (PLL) frequency synthesizers intended for use primarily in 46/49 MHz cordless phones with up to 10 channels. These parts contain two mask–programmable counter ROMs for receive and transmit loops with two independent phase detect circuits. A common reference oscillator and reference divider are shared by the receive and transmit circuits. Frequency selection is accomplished via a 4–bit parallel input for the MC145166. The MC145167 utilizes a serial interface. Other features include a lock detect circuit for the transmit loop, illegal code default, and a 5 kHz tone output.

•Synthesizes Up to Ten Channel Pairs
•Maximum Operating Frequency: 60 MHz @ Vin=200 mV p–p
•Operating Temperature Range: – 40 to + 75°C
•Operating Voltage Range: 2.5 to 5.5 V
•On–Chip Oscillator Circuit Supports External Crystal
•Lock Detect Signal
•Operating Power Consumption: 3.0 mA @ 3.0 V
•Standby Mode for Power Savings: 1.5 mA @ 3.0 V