MC145173

www.DataSheet4U.com MOTOROLA SEMICONDUCTOR TECHNICAL DATA Order this document by MC145173/D MC145173 Advance Information Dual-Band PLL Frequency Synthesizer with ADC and Frequency Counter CMOS The MC145173 is a single–chip CMOS synthesizer with a four–wire serial interface for primary use in AM–FM broadcast receivers. The device also finds use in long–wave (LW) and short–wave (SW) receivers. Two inputs to a single high–speed N counter are provided, along with 2 phase detectors; one for a VHF loop up to 130 MHz, and another for an HF loop up to 40 MHz. The VHF phase detector has a current source/sink output and both detectors feature linear transfer functions (no dead zones). An external crystal ties across on–chip circuitry which drives a completely–programmable reference counter. Thus, a broad range of tuning resolution is possible. The crystal oscillator is buffered and fed to an open–drain output which is active in the HF mode only. Due to the patented BitGrabber™ registers, address or steering bits are not needed in the serial data stream for random access of the registers. The serial port is byte–oriented to facilitate control via an MCU. Tuning across a band is accomplished with a two–byte transfer to the N register. The 6–bit analog–to–digital converter (ADC) has two input channels. The converter is read via a one–byte transfer which includes an end–of–conversion (EOC) bit. DataSheet4U.com A 22–stage frequency counter is provided and accepts two IF (intermediate f...