BLOCK DIAGRAM



PIN DESCRIPTION



FUNCTION DESCRIPTIONS

Pulse swallow function

The divide ratio can be calculated using the following equation:

fVCO = [(P x N) + A] x fOSC P R (A < N)
fVCO : Output frequency of external voltage controlled oscillator (VCO)
N : Preset divide ratio of binary 11-bit programmable counter (5 to 2,047)
A : Preset divide ratio of binary 7-bit swallow counter (0 3 A 3 127)
fOSC : Output frequency of the reference frequency oscillator
R : Preset divide ratio of binary 14-bit programmable reference counter (6 to 16,383)
P : Preset divide ratio of modules prescaler (64 or 128)

Serial data input

Serial data is processed using the Data, Clock, and LE pins. Serial data controls the 15-bit programmable reference divider and 18-bit programmable divider separately.
Binary serial data is entered via the Data pin.
One bit of data is shifted into the internal shift register on the rising edge of clock. When the load enable pin is high or open, stored data is latched depending on the control data as follows:



(a) Programmable reference divider
The programmable reference divider consists of a 16-bit shift register, a 15-bit latch and a 14-bit reference counter. The serial 16-bit data format is shown below:





(b) Programmable divider divide
The programmable divider consists of a 19-bit shift register, a 18-bit latch, a 7-bit swallow counter, and a 11-bit programmable counter. The serial 19-bit data format is shown below:





Serial data input timing



Relation between the FC input and phase characteristics

The FC pin changes the phase characteristics of the phase comparator. Both the internal charge pump output level (DO) and the phase comparator output (FR, FP) are reversed depending on the FC pin input level. Also, the monitor pin (fOUT) output is controlled by the FC pin. The relationship between the FC input level and each of DO, FR, and FP is shown below:



When designing a synthesizer, the FC pin setting depends on the VCO and LPF characteristics.



Phase comparator output waveforms



RECOMMENDED OPERATING CONDITIONS



Notes: To protect against damage by electrostatic discharge, note the following handling precautions:

- Store and transport devices in conductive containers.

- Use properly grounded workstations, tools, and equipment.

- Turn off power before inserting or removing this device into or from a socket.

- Protect leads with conductive sheet, when transporting a board mounted device.

ELECTRICAL CHARACTERISTICS
(Recommended operating conditions unless otherwise noted.)



TEST CIRCUIT
(FOR MEASURING INPUT SENSITIVITY fin/OSCin)



APPLICATION EXAMPLE



PACKAGE DIMENSION