MAX2606EUT-T

Manufacturer Part NumberMAX2606EUT-T
DescriptionRF Wireless Misc 70 to 150MHz VCO wit h Differential Outpu
ManufacturerMaxim Integrated Products
MAX2606EUT-T datasheet
 


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19-1673; Rev 0a; 4/02
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 monolith-
ic 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 dri-
ving 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.
Cellular and PCS Mobile Phones
2.4GHz ISM Band
902MHz to 928MHz ISM Band
Land Mobile Radio
GPS Receivers
General-Purpose IF Oscillators
Selector Guide
FREQUENCY
SUPPLY
PART
RANGE
CURRENT
(MHz)
(mA)
MAX2605
45 to 70
1.9
MAX2606
70 to 150
2.1
MAX2607
150 to 300
2.1
MAX2608
300 to 500
2.7
MAX2609
500 to 650
3.6
________________________________________________________________ Maxim Integrated Products
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.
45MHz to 650MHz, Integrated IF
VCOs with Differential Output
o Small Size
o Integrated Varactor for Tuning
o Low Phase Noise
o Wide Application Frequency Range
o Differential or Single-Ended Outputs
o Single +2.7V to +5.5V Supply
o Ultra-Small SOT23-6 Package
o On-Chip Temperature-Stable Bias
o Low-Current Operation
PART
MAX2605EUT-T
Applications
MAX2606EUT-T
MAX2607EUT-T
MAX2608EUT-T
MAX2609EUT-T
PHASE
TOP VIEW
NOISE
(dBc/Hz)
-117
-112
-107
-100
GND
-93
TUNE
Features
Ordering Information
PIN-
TEMP. RANGE
PACKAGE
-40°C to +85°C
6 SOT23-6
-40°C to +85°C
6 SOT23-6
-40°C to +85°C
6 SOT23-6
-40°C to +85°C
6 SOT23-6
-40°C to +85°C
6 SOT23-6
Pin Configuration/
Functional Diagram
MAX2605
MAX2606
IND
1
MAX2607
MAX2608
MAX2609
2
3
SOT23-6
TOP
MARK
AABB
AABC
AABD
AABE
AABF
6
OUT+
5
V
CC
4
OUT-
1

MAX2606EUT-T Summary of contents

  • Page 1

    ... Integrated Varactor for Tuning o Low Phase Noise o Wide Application Frequency Range o Differential or Single-Ended Outputs o Single +2.7V to +5.5V Supply o Ultra-Small SOT23-6 Package o On-Chip Temperature-Stable Bias o Low-Current Operation PART MAX2605EUT-T Applications MAX2606EUT-T MAX2607EUT-T MAX2608EUT-T MAX2609EUT-T PHASE TOP VIEW NOISE (dBc/Hz) -117 -112 -107 ...

  • Page 2

    Integrated IF VCOs with Differential Output ABSOLUTE MAXIMUM RATINGS V to GND ..............................................................-0.3V to +6V CC IND to GND ................................................-0. TUNE to GND .............................................-0. OUT+, OUT- to GND ..................................-0. Continuous Power ...

  • Page 3

    AC ELECTRICAL CHARACTERISTICS (MAX2605–MAX2609 EV kits +2.7V to +5.5V ues are +2.75V 1.5V, and T CC TUNE PARAMETER MAX2605 MAX2606 Oscillator Nominal Frequency MAX2607 Range (Note 4) MAX2608 MAX2609 MAX2605 MAX2606 ...

  • Page 4

    Integrated IF VCOs with Differential Output AC ELECTRICAL CHARACTERISTICS (continued) (MAX2605–MAX2609 EV kits +2.7V to +5.5V ues are +2.75V 1.5V, and T CC TUNE PARAMETER Even-Order Harmonics Differential, ...

  • Page 5

    EV kit +2.75V TUNE MAX2606 VCO TUNING CURVE 130 120 110 100 90 0 0.5 1.0 1.5 2.0 2.5 V (V) TUNE VCO TUNING CURVE 680 640 600 560 520 480 0 0.5 PIN NAME ...

  • Page 6

    Integrated IF VCOs with Differential Output Detailed Description The MAX2605–MAX2609 are low-noise VCOs designed for fixed/single-frequency IF applications. The core oscillator circuit is based on the well-known Colpitts topology. The varactor and feedback capacitors are integrated on-chip ...

  • Page 7

    REQUIRED INDUCTANCE vs. DESIRED VCO FIXED FREQUENCY 1900 1800 1700 1600 1500 1400 1300 1200 1100 1000 900 800 700 45 Figure 1. MAX2605 Required Inductance vs. Desired VCO Fixed Frequency _______________________________________________________________________________________ 45MHz to 650MHz, Integrated IF VCOs with Differential ...

  • Page 8

    Integrated IF VCOs with Differential Output REQUIRED INDUCTANCE vs. DESIRED VCO FIXED FREQUENCY 790 740 690 640 590 540 490 440 390 340 290 240 190 140 Figure 2. MAX2606 Required Inductance vs. Desired ...

  • Page 9

    Figure 3. MAX2607 Required Inductance vs. Desired VCO Fixed Frequency _______________________________________________________________________________________ 45MHz to 650MHz, Integrated IF VCOs with Differential ...

  • Page 10

    Integrated IF VCOs with Differential Output REQUIRED INDUCTANCE vs. DESIRED VCO FIXED FREQUENCY 41.0 40.0 38.0 37.0 36.0 35.0 34.0 33.0 32.0 31.0 30.0 29.0 28.0 27.0 26.0 25.0 24.0 23.0 22.0 21.0 20.0 19.0 18.0 17.0 ...

  • Page 11

    REQUIRED INDUCTANCE vs. DESIRED VCO FIXED FREQUENCY 14.0 13.5 13.0 12.5 12.0 11.5 11.0 10.5 10.0 9.5 9.0 8.5 8.0 7.5 7.0 6.5 6.0 5.5 5.0 4.5 4.0 3.5 500 510 520 530 540 550 Figure 5. MAX2609 Required Inductance ...

  • Page 12

    Integrated IF VCOs with Differential Output the cathode of the varactor. This is accomplished through the use of a simple bypass capacitor connect- ed from TUNE to ground. The value of this capacitor should be greater than ...

  • Page 13

    BYP 3 TUNE FROM PLL LOOP FILTER OUTPUT Figure 6. Typical Operating Circuit Chip Information TRANSISTOR COUNT: 158 ______________________________________________________________________________________ 45MHz to 650MHz, Integrated IF VCOs with Differential Output OUT+ MAX2605 MAX2606 MAX2607 ...

  • Page 14

    Integrated IF VCOs with Differential Output IND PAR2 PAR1 Figure 7. Simple Model of External Inductance MAX2605 MAX2606 MAX2607 MAX2608 4 MAX2609 Γ Figure 9. Output Matching Network 14 ______________________________________________________________________________________ ...

  • Page 15

    ... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________15 © 2002 Maxim Integrated Products ...