Name: TLC2940IPW
SKU: TLC2940IPW
Price: 0.86971 USD
Availability: InStock

TLC2940

HIGH-PERFORMANCE CMOS VOLTAGE-CONTROLLED OSCILLATOR

SLAS244 – OCTOBER 1999

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

Stable Oscillation Using External Resistor

Lock Frequency Range:

– 35 MHz to 75 MHz (V

= 5 V ± 0.25 V,

= –20°C to 85°C)

– 28 MHz to 50 MHz (V

= 3 V ± 0.15 V,

= –20°C to 85°C)

Operating Free-Air Temperature Range,

= –20°C to 85°C

8-Pin Thin Shrinked Small-Outline Package

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,

= 5 V ± 5%), and from 28 MHz to 50 MHz (over operating free-air temperature range, V

= 3 V ± 5%).

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

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

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.

LOGIC V

VCO OUT

FREFINPUT

PFD OUT

VCO V

BIAS

VCOIN

GND

PW PACKAGE

(TOP VIEW)

TLC2940

HIGH-PERFORMANCE CMOS VOLTAGE-CONTROLLED OSCILLATOR

SLAS244 – OCTOBER 1999

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

Terminal Functions

TERMINAL

I/O

DESCRIPTION

NAME NO.

I/O

DESCRIPTION

BIAS 7 M Bias supply terminal for internal VCO. The resistor should be located between V

and this terminal.

FREFINPUT 3 I Not used. This terminal should be tied to ground.

GND 5 PS Ground

LOGIC V

1 PS Power supply for the internal logic circuitry (PFD portion, input/output portion). It is recommended that this

terminal is separated from the VCO supply voltage terminal.

PFD OUT 4 O Not used. This terminal should be unconnected (open).

VCOIN 6 I VCO control voltage input.

VCO OUT 2 O VCO output. This terminal is tied to a low level at inhibit status.

VCO V

8 PS Supply voltage for VCO analog portion.

†

I: Input, O: Output, PS: Power supply/GND, M: Others

detailed description

The TLC2940 is an analog VCO IC that generates a frequency that is a multiple of a reference frequency for

a PLL block configuration. Normally, a PLL block is composed of a VCO, a phase frequency detector, counter

logic, and a loop filter.

The following is a description for the analog VCO of the TLC2940.

The built-in analog VCO is composed of a ring oscillator portion for oscillation operation and a bias control

portion to generate a bias level to supply to the ring oscillator. The oscillation operation is performed by a bias

resistor (R

BIAS

) connected between the bias control (pin 7) and the supply voltage (pin 8). The VCO oscillation

frequency is determined by this resistor value, R

BIAS

, that is, the oscillation frequency decreases as the resistor

value increases, and the oscillation frequency increases as the resistor value decreases. The lock frequency

range is from 35 MHz to 75 MHz with a R

BIAS

of 1.5 kΩ to 4.3 kΩ at 5-V operation and from 28 MHz to 50 MHz

with a R

BIAS

of 1.5 kΩ to 2.7 kΩ at 3-V operation over the recommended supply voltage and operating free-air

temperature range.

Refer to the curves shown in the typical characteristics section for the lock frequency ranges with varying R

BIAS

values.

VCO Oscillation Frequency Range

Bias Resistor (R

BIAS

)

VCO Control Voltage (V

COIN

)

VCO Oscillation

Figure 1. VCO Oscillation Frequency Range Setting

TLC2940

HIGH-PERFORMANCE CMOS VOLTAGE-CONTROLLED OSCILLATOR

SLAS244 – OCTOBER 1999

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

absolute maximum ratings over operating free-air temperature (unless otherwise noted)

†

Supply voltage (any supply), V

(see Note 1) 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Input voltage range (any input), V

(see Note 1) –0.5 V to V

+ 0.5 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Input current (any input), I

±20 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Output current (any output), I

±20 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Continuous total power dissipation (T

= 25°C or below), P

(see Note 2) 700 mW. . . . . . . . . . . . . . . . . . . . . .

Operating free-air temperature range, T

–20°C to 85°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Storage temperature range, T

stg

–65°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds 260°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

†

Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and

functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not

implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

NOTES: 1. All voltage values are with respect to network GND terminals.

2. For operation above 25°C free-air temperature, derate linearly at the rate of 5.6 mW/°C.

recommended operating conditions

PARAMETER MIN NOM MAX UNIT

ly voltage V

(any su

ly see Notes 3 and 4)

3-V operation 2.85 3 3.15

ppl

y v

oltage

(an

ppl

see

Notes

and

5-V operation 4.75 5 5.25

Input voltage, V

(inputs except VCO IN) 0 V

Output current, I

(any output) 0 ±2 mA

VCO control voltage at VCO IN 1 V

–0.5 V

BIAS

= 1.5 kΩ 42 50

3Vo

eration

BIAS

= 1.8 kΩ 37 47

operation

BIAS

= 2.2 kΩ 33 45

Lock frequency

BIAS

= 2.7 kΩ 28 42

MHz

Lock

freq

enc

BIAS

= 1.5 kΩ 65 75

5Vo

eration

BIAS

= 2.4 kΩ 50 65

operation

BIAS

= 3.3 kΩ 43 56

RBIAS = 4.3 kΩ 35 50

VCO oscillation frequency setting resistor R

BIAS

3-V operation 1.5 2.7

kΩ

VCO

oscillation

freq

enc

setting

resistor

BIAS

5-V operation 1.5 4.3

kΩ

Operating free-air temperature, T

–20 85 °C

NOTES: 3. It is recommended that the logic supply terminal (LOGIC V

) and the VCO supply terminal (VCO V

) should be at the same voltage

and separate from each other.

4. The bypass capacitor should be located as close as possible to each power supply.

5. The FREFINPUT (pin 3) and PFD OUT (pin 4) terminals are input/output terminals preset for logic function respectively. In normal

operation, the FREFINPUT shoud be tied to GND and PDF OUT should be left unconnected (open).

Part #	TLC2940IPW
Description	PLL Single 28MHz to 75MHz 8-Pin TSSOP - Bulk (Alt: TLC2940
Category	IC
Availability	In Stock
Qty	4

TLC2940IPW

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