MC12181数据手册恩XP中文资料规格书

描述 Description

Overview The MC12181 is a monolithic bipolar synthesizer integrating a high performance prescaler, programmable divider, phase/frequency detector, charge pump, and reference oscillator/buffer functions. The device is capable of synthesizing a signal which is 25 to 40 times the input reference signal. The device has a 4–bit parallel interface to set the proper total multiplication which can range from 25 to 40. When combined with an external passive loop filter and VCO, the MC12181 serves as a complete PLL subsystem.

特性 Features

•2.7 to 5.5 V Operation
•Low power supply current of 4.25mA typical
•On chip reference oscillator/buffer supporting wide frequency operating
range from 5 to 25MHz
•4–bit parallel interface for programming divider (N = 25 .... 40)
•Wide 125 – 1000MHz frequency of operation
•Digital phase/frequency detector with linear transfer function
•Balanced Charge Pump Output
•Space efficient 16 lead SOIC package
•Operating Temperature Range of –40 to 85°C
•>1000 Volt ESD Protection (I/O to Ground, I/O to V CC )
The device is suitable for applications where a fixed local oscillator (LO) needs to be synthesized or where a limited number of
LO frequencies need to be generated. The device also has auxiliary open emitter outputs (Pout and Rout) for observing the
inputs to the phase detector for verification purposes. In normal use the pins should be left open. The Reset input is normally
LOW. When this input is placed in the HIGH state the reference prescaler is reset and the charge pump output (Do) is placed in
the OFF state.
The 4–bit programming interface maps into divider states ranging from 25 to 40. A is the LSB and D is the MSB. The data
inputs (A,B,C, and D) are CMOS compatible and have pull–up resistors. The inputs can be tied directly to Vcc or Ground for
programming or can be interfaced to an external data latch/register.