MC1451701

The new MC1451701 is pinforpin compatible with the MC145170. A omparison of the two parts is shown in the table below. The MC1451701 is ecommended for new designs.

The MC1451701 is a singlechip synthesizer capable of direct usage in th MF, HF, and VHF bands. A special architecture makes this PLL the easiest to rogram in the industry. Either a bit or byteoriented format may be used. Due o the patented BitGrabberE registers, no address/steering bits are required for andom access of the three registers. Thus, tuning can be accomplished via a byte serial transfer to the 16bit N register.

The device features fully programmable R and N counters, an amplifier at the in pin, onchip support of an external crystal, a programmable reference utput, and both single and doubleended phase detectors with linear transfer unctions (no dead zones). A configuration (C) register allows the part to be onfigured to meet various applications. A patented feature allows the C egister to shut off unused outputs, thereby minimizing noise and interference.

In order to reduce lock times and prevent erroneous data from being loaded nto the counters, a patented jamload feature is included. Whenever a new ivide ratio is loaded into the N register, both the N and R counters are amloaded with their respective values and begin counting down together. The hase detectors are also initialized during the jam load.
• Operating Voltage Range: 2.5 to 5.5 V
• Maximum Operating Frequency:
185 MHz @ Vin = 500 mV pp, 4.5 V Minimum Supply
100 MHz @ Vin = 500 mV pp, 3.0 V Minimum Supply
• Operating Supply Current: 0.6 mA @ 3 V, 30 MHz
1.5 mA @ 3 V, 100 MHz
3.0 mA @ 5 V, 50 MHz
5.8 mA @ 5 V, 185 MHz
• Operating Temperature Range: 40 to 85°C
• R Counter Division Range: 1 and 5 to 32,767
• N Counter Division Range: 40 to 65,535
• Direct Interface to Motorola SPI and National MICROWIREE Serial Data orts
• Chip Complexity: 4800 FETs or 1200 Equivalent Gates
• See Application Note AN1207/D