TLC2940

HIGH-PERFORMANCE CMOS VOLTAGE-CONTROLLED OSCILLATOR

SLAS244 – OCTOBER 1999

1

POST OFFICE BOX 655303

description

The TLC2940 is a high-performance analog voltage-controlled oscillator (VCO) using Texas Instruments

0.8-

µm CMOS process. The VCO oscillating operation can be performed by an external bias resistor connected

to the internal oscillation circuitry, and the oscillation frequency range is set by this bias resistor. The lock

frequency range for PLL applications is from 35 MHz to 75 MHz (over operating free-air temperature range,

The stable analog PLL can be configured within these frequency ranges.

The device is available in an 8-pin TSSOP surface-mount package.

The PLL block is configured using a counter, a required LPF, and a phase frequency detector (PFD).

AVAILABLE OPTIONS

PACKAGE

TA

TSSOP

(PW)

–20

°C to 85°C

TLC2940IPW

functional block diagram

Bias

Circuit

Output

Buffer

VCO CONTROL

VCOIN

VCO OUT

BIAS

RESISTOR

VCO OUT

VCO

TLC2940

BIAS

VCOIN

Copyright

© 1999, Texas Instruments Incorporated

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of Texas Instruments

standard warranty. Production processing does not necessarily include

testing of all parameters.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

1

2

3

4

8

7

6

5

VCO OUT

FREFINPUT

PFD OUT

BIAS

VCOIN

GND

PW PACKAGE

(TOP VIEW)