

PIN DESCRIPTION

FUNCTIONAL DESCRIPTIONS
SERIAL DATA INPUT
Serial data input is achieved by three inputs, such as Data pin, Clock pin and LE pin. Serial data input controls 15-bit programmable reference divider
and 19-bit programmable divider, respectively.
Binary serial data is input to Data pin.
On rising edge of clock shifts one bit of serial data into the internal shift registers and when load enable pin is high level or open, stored data is
transferred into latch depending upon the control bit.
Control data "H" data is transferred into 15-bit latch.
Control data "L" data is transferred into 19-bit latch.
THE DIVIDE RATIO SETTING
fVCO=[(MxN)+A]xfOSCPR
fVCO: Output frequency of external voltage controlled oscillator (VCO)
M: Preset modulus of external dual modulus prescaler (128 or 256)
N: Preset divide ratio of binary 11-bit programmable counter (16 to 2047)
A: Preset divide ratio of binary 8-bit swallow counter (03A3255, A<N)
fOSC: Output frequency of the external reference frequency oscillator
R: Preset divide ratio of binary 14-bit programmable reference counter (8 to 16383)
PROGRAMMABLE REFERENCE DIVIDER
Programmable reference divider consists of 16-bit shift register, 15-bit latch and 14-bit reference counter. Serial 16-bit data format is shown below.

14-BIT PROGRAMMABLE REFERENCE COUNTER DIVIDE RATIO

PROGRAMMABLE DIVIDER
Programmable divider consists of 20-bit shift register, 19-bit latch, 8-bit swallow counter and 11-bit programmable counter.
Serial 20-bit data format is shown below.

8-BIT SWALLOW COUNTER DIVIDE RATIO

11-BIT PROGRAMMABLE COUNTER DIVIDE RATIO


PHASE CHARACTERISTICS

PHASE DETECTOR OUTPUT WAVEFORM (FC=High)

ANALOG SWITCH
ON/OFF of analog switch is controlled by LE input signal. When the analog switch is ON, internal charge pump output (DO) is connected to BISW pin.
When the analog switch is OFF, BI-SW pin is set to high-impedance state.

When an analog switch is inserted between LP1 and LP2, faster lock up time is achieved to reduce LPF time constant during PLL channel switching.

RECOMMENDED OPERATING CONDITIONS

HANDLING PRECAUTIONS
w This device should be transported and stored in anti-static containers.
w This is a static-sensitive device; take proper anti-ESD precautions. Ensure that personnel and equipment are properly grounded. Cover
workbenches with grounded conductive mats.
w Always turn the power supply off before inserting or removing the device from its socket.
w Protect leads with a conductive sheet when handling or transporting PC boards with devices.
ELECTRICAL CHARACTERISTICS

TEST CIRCUIT (Prescaler Input Sensitivity)

TYPICAL APPLICATION EXAMPLE

PACKAGE DIMENSIONS




