MAXIM MAX2605, MAX2609 Technical data

General Description

The MAX2605–MAX2609 are compact, high-performance intermediate-frequency (IF) voltage-controlled oscillators (VCOs) designed specifically for demanding portable wireless communication systems. They combine monolithic construction with low-noise, low-power operation in a tiny 6-pin SOT23 package.

These low-noise VCOs feature an on-chip varactor and feedback capacitors that eliminate the need for external tuning elements, making the MAX2605–MAX2609 ideal for portable systems. Only an external inductor is required to set the oscillation frequency. In addition, an integrated differential output buffer is provided for driving a mixer or prescaler. The buffer output is capable of supplying up to -8dBm (differential) with a simple power match. It also provides isolation from load impedance variations.

The MAX2605–MAX2609 operate from a single +2.7V to +5.5V supply and offer low current consumption. These IF oscillators can cover the 45MHz to 650MHz frequency range.

Applications

Cellular and PCS Mobile Phones

2.4GHz ISM Band

902MHz to 928MHz ISM Band

Land Mobile Radio

GPS Receivers

General-Purpose IF Oscillators

Features

♦ Small Size

♦ Integrated Varactor for Tuning

♦ Low Phase Noise

♦ Wide Application Frequency Range

♦ Differential or Single-Ended Outputs

♦ Single +2.7V to +5.5V Supply

♦ Ultra-Small SOT23-6 Package

♦ On-Chip Temperature-Stable Bias

♦ Low-Current Operation

MAX2605–MAX2609

45MHz to 650MHz, Integrated IF

VCOs with Differential Output

________________________________________________________________ Maxim Integrated Products 1

GND

OUT-TUNE

16OUT+

5 V

IND

MAX2605 MAX2606 MAX2607 MAX2608 MAX2609

SOT23-6

TOP VIEW

19-1673; Rev 0a; 4/02

EVALUATION KIT MANUAL

AVAILABLE

Pin Configuration/

Functional Diagram

Ordering Information

PART

MAX2605

MAX2606

MAX2607 150 to 300

70 to 150

45 to 70

FREQUENCY

RANGE

(MHz)

SUPPLY

CURRENT

(mA)

1.9

2.1

MAX2608 300 to 500 2.7

PHASE

NOISE

(dBc/Hz)

-117

-112

-107

-100

MAX2609 500 to 650 3.6 -93

Selector Guide

AABE6 SOT23-6-40°C to +85°C

MAX2608EUT-T

AABD

AABC

AABB

TOP

MARK

6 SOT23-6

PIN-

PACKAGE

TEMP. RANGE

-40°C to +85°C

MAX2607EUT-T

MAX2606EUT-T

MAX2605EUT-T

PART

AABF6 SOT23-6-40°C to +85°C

MAX2609EUT-T

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

MAX2605–MAX2609

45MHz to 650MHz, Integrated IF VCOs with Differential Output

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

DC ELECTRICAL CHARACTERISTICS

(VCC= +2.7V to +5.5V, V

TUNE

= 0.4V to 2.4V, TA= -40°C to +85°C, unless otherwise noted. Typical values are at VCC= +2.75V,

TUNE

= 1.5V, and TA= +25°C.) (Note1)

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 in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

VCCto GND..............................................................-0.3V to +6V

IND to GND ................................................-0.6V to (V

+ 0.3V)

TUNE to GND .............................................-0.3V to (V

+ 0.3V)

OUT+, OUT- to GND ..................................-0.3V to (V

+ 0.6V)

Continuous Power Dissipation (T

= +85°C)

6-Pin SOT23 (derate

8.7mW/°C above +70°C) ...........696mW

Operating Temperature Range ...........................-40°C to +85°C

Junction Temperature......................................................+150°C

Storage Temperature Range .............................-65°C to +150°C

Lead Temperature (soldering, 10s) .................................+300°C

MAX2609

TA= -40°C to +85°C

TA= +25°C

7.5

DC Output Current (Note 3) 0.5 1.0 1.5OUT+ plus OUT-

TA= -40°C to +85°C

TA= +25°C

TA= -40°C to +85°C

TA= +25°C

TA= -40°C to +85°C

TA= +25°C

TA= -40°C to +85°C

TA= +25°C

PARAMETER MIN TYP MAX UNITS

3.5

2.1 3.2

3.0

Supply Current (Note 2)

2.1 2.7

2.7 4.4

5.5

3.6 6.8

TUNE Input Current 0.03 nA

Supply Voltage 2.7 5.5

1.9 2.6

2.8

CONDITIONS

MAX2607

MAX2606

MAX2608

MAX2605

45MHz to 650MHz, Integrated IF

VCOs with Differential Output

_______________________________________________________________________________________ 3

AC ELECTRICAL CHARACTERISTICS

(MAX2605–MAX2609 EV kits, VCC= +2.7V to +5.5V, V

TUNE

= 0.4V to 2.4V, TA= -40°C to +85°C, unless otherwise noted. Typical val-

ues are at V

= +2.75V, V

TUNE

= 1.5V, and TA= +25°C.) (Note 1)

MAX2609, QL≥ 40

Peak Tuning Gain

14.5

%/VV

TUNE

= 0.4V to 0.6V step (Note 6)

TA= +25°C

-5.0 +3.8

500 650

MAX2609

MAX2608, QL≥ 40

MAX2607, QL≥ 35

MAX2606, QL≥ 35

MAX2605, QL≥ 35

-107

dBc/Hz

-100

-93

-117

Phase Noise (Note 8)

-112

OFFSET

= 100kHz

-4.7 +3.6

TA= +25°C

PARAMETER MIN TYP MAX UNITS

Guaranteed Frequency Limits (relative to nominal) (Note 5)

-4.1 +3.2

300 500

-4.4 +3.4

-4.6 +3.6

Oscillator Nominal Frequency Range (Note 4)

45 70

70 150

150 300

CONDITIONS

MAX2606

MAX2605

MAX2608

MAX2607

MAX2608

MAX2605

MAX2606

MAX2607

Single-Ended Output Power (Note 7)

-10

dBm

TA= -40°C to +85°C

-2.25 +2.25

-2.5 +2.5

-2.75 +2.75

-2.8 +2.8

-3.0 +3.0

MAX2605–MAX2609

MAX2609

MHz

MAX2605–MAX2609

45MHz to 650MHz, Integrated IF VCOs with Differential Output

4 _______________________________________________________________________________________

AC ELECTRICAL CHARACTERISTICS (continued)

(MAX2605–MAX2609 EV kits, VCC= +2.7V to +5.5V, V

TUNE

= 0.4V to 2.4V, TA= -40°C to +85°C, unless otherwise noted. Typical val-

ues are at V

= +2.75V, V

TUNE

= 1.5V, and TA= +25°C.) (Note 1)

Note 1: Production tested at TA= +25°C. Maximum and minimum over temperature limits are guaranteed by design and

characterization.

Note 2: Supply current is measured while the part is oscillating and inductor Q ≥ Q

MIN

. For MAX2605/MAX2606/MAX2607, Q

MIN

= 35;

for MAX2608/MAX2609, Q

MIN

= 40.

Note 3: The DC output current is the total available output signal current. Note 4: Application range of the part is achieved using external inductance as specified in Figures 1-5 and shown in Figure 6. The inter-

nal varactors support center frequencies of 45MHz to 650MHz. The center frequency is defined by the value of the external inductor element, L

. The application frequency limits are guaranteed by design and characterization.

Note 5: The guaranteed (tested) limits ƒ

MIN

and ƒ

MAX

are measured at V

TUNE

= 0.4V and V

TUNE

= 2.4V, respectively. Passing

requirements are: ƒ ≤ ƒ

MIN

at V

TUNE

= 0.4 and ƒ ≥ ƒ

MAX

at V

TUNE

= 2.4V. The nominal frequency of oscillation is defined by

the inductor.

Note 6: Describes peak tuning gain, which occurs at V

TUNE

= 0.4V.

Note 7: Measurement at OUT+ or OUT- matched for optimum power transfer into 50Ω load near the center of the operating frequency

range.

Note 8: The phase-noise specifications listed apply to the typical operating circuit shown in Figure 6. Apply over the entire operating

frequency range of the MAX2605–MAX2609.

Note 9: Supply pushing is measured with V

stepped from +2.7V to +3.2V.

1.0

1.5

2.0

3.0

2.5

3.5

4.0

-40 0-20 20 40 60 80

SUPPLY CURRENT

vs. TEMPERATURE

MAX2605/9-01

TEMPERATURE (°C)

SUPPLY CURRENT (mA)

MAX2609

MAX2605

MAX2606MAX2607MAX2608

0.02

0.06

0.04

0.08

0.10

-40 0-20 20 40 60 80

TUNE INPUT LEAKAGE CURRENT

vs. TEMPERATURE

MAX2605/9-02

TEMPERATURE (°C)

LEAKAGE CURRENT (nA)

0 1.00.5 1.5 2.0 2.5 3.0

MAX2605

VCO TUNING CURVE

MAX2605/9-03

TUNE

(V)

FREQUENCY (MHz)

Typical Operating Characteristics

(MAX260_ EV kit, VCC= +2.75V, V

TUNE

= 1.4V, TA = +25°C, unless otherwise noted.)

dBcEven-Order Harmonics -30Differential, RL= 50Ω each side

PARAMETER MIN TYP MAX UNITS

CONDITIONS

MAX2605

120

MAX2606

480

MAX2608

220

MAX2607

Supply Pushing (Note 9)

720

kHz/V

MAX2609

_______________________________________________________________________________________ 5

MAX2605–MAX2609

45MHz to 650MHz, Integrated IF

VCOs with Differential Output

100

110

120

130

0 1.00.5 1.5 2.0 2.5 3.0

MAX2606

VCO TUNING CURVE

MAX2605/9-04

TUNE

(V)

FREQUENCY (MHz)

160

180

200

220

240

260

0 1.00.5 1.5 2.0 2.5 3.0

MAX2607

VCO TUNING CURVE

MAX2605/9-05

TUNE

(V)

FREQUENCY (MHz)

310

340

370

400

430

0 1.00.5 1.5 2.0 2.5 3.0

MAX2608

VCO TUNING CURVE

MAX2605/9-06

TUNE

(V)

FREQUENCY (MHz)

480

520

560

600

640

680

0 1.00.5 1.5 2.0 2.5 3.0

MAX2609

VCO TUNING CURVE

MAX2605/9-07

TUNE

(V)

FREQUENCY (MHz)

-50

-40

-30

-20

-10

o5fo

2fo3f

6fo7f

MAX2605/9-08

FREQUENCY

(dB)

OUTPUT SPECTRUM

NAME FUNCTION

1 IND

Tuning Inductor Port. Connect an inductor from IND to GND to set VCO center frequency (see Oscillation Frequency).

2 GND Ground. Connect to the ground plane with a low-inductance path.

3 TUNE Voltage-Control Input for Frequency Tuning. Input voltage range from +0.4V to +2.4V.

4 OUT-

High-Impedance Open-Collector Output. An external pull-up resistor or inductor to VCCis required. Output power is dependent on external load impedance. OUT- is complementary to OUT+.

6 OUT+

High-Impedance Open-Collector Output. An external pull-up resistor or inductor to VCCis required. Output power is dependent on external load impedance. OUT+ is complementary to OUT-.

5 V

Supply Voltage Connection. Connect an external bypass capacitor to ground for low noise and low spurious-output content. See Layout Issues for more details.

Pin Description

Typical Operating Characteristics (continued)

(MAX260_ EV kit, VCC= +2.75V, V

TUNE

= 1.4V, TA = +25°C, unless otherwise noted.)

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