Low-Voltage 2.0 GHz PLL Frequency Synthesizer Includes On-Board 64/65 Prescaler
The MC145202 is a low–voltage single–package synthesizer with serial interface capable of direct usage up to 2.0 GHz.
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 Plusï£ª registers, the MC145202 may be cascaded with other peripherals featuring Bit Grabber Plus without requiring leading dummy bits or address bits in the serial data stream. In addition, Bit Grabber Plus peripherals may be cascaded with existing Bit Grabberï£ª peripherals.
The device features a single–ended current source/sink phase detector A output and a double–ended phase detector B output. Both phase detectors have linear transfer functions (no dead zones). The maximum current of the single–ended phase detector output is determined by an external resistor tied from the Rx pin to ground. This current can be varied via the serial port.
Slew–rate control is provided by a special driver designed for the REF out pin.
This minimizes interference caused by REF out. This part includes a differential RF input that may be operated in a single–ended mode. Also featured are on–board support of an external crystal and a programmable reference output. The R, A, and N counters are fully programmable. The C register (configuration register) allows the part to be configured to meet various applications. A patented feature allows the C register to shut off unused outputs, thereby minimizing system noise and interference.
In order to have consistent lock times and prevent erroneous data from being loaded into the counters, on–board circuitry synchronizes the update of the A register if the A or N counters are loading. Similarly, an update of the R register is synchronized if the R counter is loading.
The double–buffered R register allows new divide ratios to be presented to the three counters (R, A, and N) simultaneously.
• Maximum Operating Frequency: 2000 MHz @ – 10 dBm
• Operating Supply Current: 4 mA Nominal at 3.0 V
• Operating Supply Voltage Range (VDD and VCC Pins): 2.7 to 5.5 V
• Operating Supply Voltage Range of Phase Detectors (VPD Pin): 2.7 to 5.5 V
• Current Source/Sink Phase Detector Output Capability: 1.7 mA @ 5.0 V
1.0 mA @ 3.0 V
• Gain of Current Source/Sink Phase/Frequency Detector Controllable via
• Operating Temperature Range: – 40 to + 85°C
• R Counter Division Range: 1 and 5 to 8191
• Dual–Modulus Capability Provides Total Division up to 262,143
• High–Speed Serial Interface: 4 Mbps
• OUTPUT A Pin, When Configured as Data Out, Permits Cascading of Devices
• Two General–Purpose Digital Outputs — OUTPUT A: Totem–Pole (Push–Pull) with Four Output Modes
OUTPUT B: Open–Drain
• Patented Power–Saving Standby Feature with Orderly Recovery for
Minimizing Lock Times, Standby Current: 30 µA
• Evaluation Kit Available (Part Number MC145202EVK)
• See Application Note AN1253/D for Low–Pass Filter Design, and
AN1277/D for Offset Reference PLLs for Fine Resolution or Fast Hopping
BitGrabber and BitGrabber Plus are trademarks of Motorola, Inc.
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