PLL501-21/23

VCXO Clock Generator IC

47745 Fremont Blvd., Fremont, California 94538 TEL (510) 492-0990 FAX (510) 492-0991

Rev 01/15/01 Page 1

FEATURES

• On-chip tunable voltage-controlled crystal

oscillator circuitry (VCXO) allows precise system

frequency tuning (pull range 200ppm minimum).

• VCXO tuning range: 0-3.3V.

• Uses inexpensive fundamental-mode crystals.

• Integrated phase-locked loop (PLL) multiplies

VCXO frequency to the higher system

frequencies needed.

• 3.3V supply voltage.

• Small circuit board footprint (8-pin 0.150’’ SOIC).

• Custom frequency selections available.

• 12mA output drives capability at TTL level.

DESCRIPTIONS

The PLL501-21/23 is a monolithic low Jitter, high

performance CMOS clock generator IC. It has a

circuitry that implements a voltage-controlled crystal

oscillator when an external resonator (nominally

13.5MHz) is attached. The VCXO allows device

frequencies to be precisely adjusted for matching

requirements.

This product is ideal for Set-Top Box and multimedia

synthesizer applications.

PIN CONFIGURATION

Table 1: Crystal / Output Frequencies

DEVICE

CLK (MHz)

PLL501-21

13.5

27

PLL501-23

13.5

54

Note: Contact PhaseLink for custom PLL Frequencies

BLOCK DIAGRAM

VIN

XOUT

XIN

VCXO

PLL

CLK

Output

Buffer

1

2

3

4

5

6

7

8

XIN

VDD

VIN

GND

XOUT

VDD

CLK

GND