MC145220

MOTOROLA SEMICONDUCTOR TECHNICAL DATA Order this document by MC145220/D MC145220 Dual 1.1 GHz PLL Frequency Synthesizer BiCMOS The MC145220 is a low–voltage, single–chip frequency synthesizer with serial interface capable of direct usage up to 1.1 GHz. The device simultaneously supports two loops. The two on–chip dual–modulus prescalers may be independently programmed to divide by either 32/33 or 64/65. The device consists of two dual–modulus prescalers, two 6–stage A counters, two 12–stage N counters, two fully programmable 13–stage R (reference) counters, and two lock detectors. Four phase/frequency detectors are included: two with current source/sink outputs and two with double–ended outputs. The counters are programmed via a synchronous serial port which is SPI compatible. The serial port is byte–oriented to facilitate control via an MCU. Due to the innovative BitGrabber Plus™ registers, the MC145220 may be cascaded with other peripherals featuring BitGrabber Plus without requiring leading dummy bits or multiple address bits in the serial data stream. In addition, BitGrabber Plus peripherals may be cascaded with existing BitGrabber™ peripherals. Because this device is a dual synthesizer, a single steering bit is used in the serial data stream to direct the data to either side of the chip. The phase/frequency detectors have linear transfer functions (no dead zones). The current delivered by the current source/sink outputs is controllable via the serial port. Also featu...