MAX2605EUT+T

EVALUATION KIT AVAILABLE MAX2605–MAX2609 45MHz to 650MHz, Integrated IF VCOs with Differential Output LE AVAILAB General Description Features 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. ♦ Small Size 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. ♦ Differential or Single-Ended Outputs Applications Cellular and PCS Mobile Phones ♦ Integrated Varactor for Tuning ♦ Low Phase Noise ♦ Wide Application Frequency Range ♦ Single +2.7V to +5.5V Supply ♦ Ultra-Small SOT23-6 Package ♦ On-Chip Temperature-Stable Bias ♦ Low-Current Operation Ordering Information PART TEMP. RANGE PINPACKAGE TOP MARK MAX2605EUT-T -40°C to +85°C 6 SOT23-6 AABB MAX2606EUT-T -40°C to +85°C 6 SOT23-6 AABC MAX2607EUT-T -40°C to +85°C 6 SOT23-6 AABD 2.4GHz ISM Band MAX2608EUT-T -40°C to +85°C 6 SOT23-6 AABE 902MHz to 928MHz ISM Band MAX2609EUT-T -40°C to +85°C 6 SOT23-6 AABF Land Mobile Radio GPS Receivers Functional Diagrams General-Purpose IF Oscillators Pin Configuration/ Functional Diagram Selector Guide FREQUENCY RANGE (MHz) SUPPLY CURRENT (mA) PHASE NOISE (dBc/Hz) MAX2605 45 to 70 1.9 -117 MAX2606 MAX2607 MAX2608 MAX2609 70 to 150 150 to 300 300 to 500 500 to 650 2.1 2.1 2.7 3.6 -112 -107 -100 -93 PART TOP VIEW IND 1 GND 2 MAX2605 MAX2606 MAX2607 MAX2608 MAX2609 TUNE 3 Pin Configurations appear at end of data sheet. Functional Diagrams continued at end of data sheet. UCSP is a trademark of Maxim Integrated Products, Inc. 6 OUT+ 5 VCC 4 OUT- SOT23-6 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com. 19-1673; Rev 0a; 4/02 MAX2605–MAX2609 45MHz to 650MHz, Integrated IF VCOs with Differential Output ABSOLUTE MAXIMUM RATINGS VCC to GND ..............................................................-0.3V to +6V IND to GND ................................................-0.6V to (VCC + 0.3V) TUNE to GND .............................................-0.3V to (VCC + 0.3V) OUT+, OUT- to GND ..................................-0.3V to (VCC + 0.6V) Continuous Power Dissipation (TA = +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 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. DC ELECTRICAL CHARACTERISTICS (VCC = +2.7V to +5.5V, VTUNE = 0.4V to 2.4V, TA = -40°C to +85°C, unless otherwise noted. Typical values are at VCC = +2.75V, VTUNE = 1.5V, and TA = +25°C.) (Note1) PARAMETER CONDITIONS Supply Voltage MAX2606 MAX2607 MAX2608 MAX2609 DC Output Current (Note 3) TUNE Input Current 2 TYP MAX 1.9 2.6 2.7 MAX2605 Supply Current (Note 2) MIN OUT+ plus OUT- TA = +25°C 5.5 TA = -40°C to +85°C UNITS V 2.8 TA = +25°C 2.1 2.7 2.1 3.2 TA = -40°C to +85°C 3.0 TA = +25°C TA = -40°C to +85°C 3.5 TA = +25°C 2.7 4.4 3.6 6.8 1.0 1.5 TA = -40°C to +85°C mA 5.5 TA = +25°C TA = -40°C to +85°C 7.5 0.5 0.03 mA nA Maxim Integrated MAX2605–MAX2609 45MHz to 650MHz, Integrated IF VCOs with Differential Output AC ELECTRICAL CHARACTERISTICS (MAX2605–MAX2609 EV kits, VCC = +2.7V to +5.5V, VTUNE = 0.4V to 2.4V, TA = -40°C to +85°C, unless otherwise noted. Typical values are at VCC = +2.75V, VTUNE = 1.5V, and TA = +25°C.) (Note 1) PARAMETER Oscillator Nominal Frequency Range (Note 4) CONDITIONS 45 70 70 150 MAX2607 150 300 MAX2608 300 500 MAX2609 500 650 TA = +25°C -4.1 +3.2 TA = -40°C to +85°C -2.25 +2.25 TA = +25°C -4.4 +3.4 TA = -40°C to +85°C -2.5 +2.5 TA = +25°C -4.6 +3.6 TA = -40°C to +85°C -2.75 +2.75 TA = +25°C -4.7 +3.6 TA = -40°C to +85°C -2.8 +2.8 TA = +25°C -5.0 +3.8 TA = -40°C to +85°C -3.0 MAX2607 MAX2608 MAX2609 VTUNE = 0.4V to 0.6V step (Note 6) Single-Ended Output Power (Note 7) Phase Noise (Note 8) Maxim Integrated MAX MAX2605 MAX2606 Peak Tuning Gain TYP MAX2606 MAX2605 Guaranteed Frequency Limits (relative to nominal) (Note 5) MIN fOFFSET = 100kHz UNITS MHz % +3.0 14.5 %/V -10 dBm MAX2605, QL ≥ 35 -117 MAX2606, QL ≥ 35 -112 MAX2607, QL ≥ 35 -107 MAX2608, QL ≥ 40 -100 MAX2609, QL ≥ 40 -93 dBc/Hz 3 MAX2605–MAX2609 45MHz to 650MHz, Integrated IF VCOs with Differential Output AC ELECTRICAL CHARACTERISTICS (continued) (MAX2605–MAX2609 EV kits, VCC = +2.7V to +5.5V, VTUNE = 0.4V to 2.4V, TA = -40°C to +85°C, unless otherwise noted. Typical values are at VCC = +2.75V, VTUNE = 1.5V, and TA = +25°C.) (Note 1) PARAMETER CONDITIONS Even-Order Harmonics Supply Pushing (Note 9) MIN TYP Differential, RL = 50Ω each side -30 MAX2605 60 MAX2606 120 MAX2607 220 MAX2608 480 MAX2609 720 MAX UNITS dBc kHz/V 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 ≥ QMIN. For MAX2605/MAX2606/MAX2607, QMIN = 35; for MAX2608/MAX2609, QMIN = 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 internal varactors support center frequencies of 45MHz to 650MHz. The center frequency is defined by the value of the external inductor element, LF. The application frequency limits are guaranteed by design and characterization. Note 5: The guaranteed (tested) limits ƒMIN and ƒMAX are measured at VTUNE = 0.4V and VTUNE = 2.4V, respectively. Passing requirements are: ƒ ≤ ƒMIN at VTUNE = 0.4 and ƒ ≥ ƒMAX at VTUNE = 2.4V. The nominal frequency of oscillation is defined by the inductor. Note 6: Describes peak tuning gain, which occurs at VTUNE = 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 VCC stepped from +2.7V to +3.2V. Typical Operating Characteristics (MAX260_ EV kit, VCC = +2.75V, VTUNE = 1.4V, TA = +25°C, unless otherwise noted.) SUPPLY CURRENT vs. TEMPERATURE MAX2608 MAX2607 MAX2606 2.5 2.0 0.08 MAX2605/9-03 MAX2605/9-02 65 60 FREQUENCY (MHz) MAX2609 LEAKAGE CURRENT (nA) SUPPLY CURRENT (mA) 3.5 0.06 0.04 55 50 0.02 1.5 MAX2605 1.0 45 0 -40 -20 0 20 40 TEMPERATURE (°C) 4 0.10 MAX2605/9-01 4.0 3.0 MAX2605 VCO TUNING CURVE TUNE INPUT LEAKAGE CURRENT vs. TEMPERATURE 60 80 -40 -20 0 20 40 TEMPERATURE (°C) 60 80 0 0.5 1.0 1.5 2.0 2.5 3.0 VTUNE (V) Maxim Integrated MAX2605–MAX2609 45MHz to 650MHz, Integrated IF VCOs with Differential Output Typical Operating Characteristics (continued) (MAX260_ EV kit, VCC = +2.75V, VTUNE = 1.4V, TA = +25°C, unless otherwise noted.) MAX2607 VCO TUNING CURVE 430 MAX2605/9-05 260 MAX2605/9-04 130 MAX2608 VCO TUNING CURVE 240 110 100 FREQUENCY (MHz) 400 FREQUENCY (MHz) FREQUENCY (MHz) 120 MAX2605/9-06 MAX2606 VCO TUNING CURVE 220 200 340 180 160 90 0 0.5 1.0 1.5 2.0 2.5 310 0 3.0 0.5 1.0 1.5 2.0 2.5 3.0 0 0.5 1.0 VTUNE (V) VTUNE (V) 1.5 2.0 2.5 3.0 VTUNE (V) MAX2609 VCO TUNING CURVE OUTPUT SPECTRUM 640 MAX2605/9-08 0 MAX2605/9-07 680 -10 600 -20 (dB) FREQUENCY (MHz) 370 560 -30 520 -40 -50 480 0 0.5 1.0 1.5 2.0 2.5 3.0 fo 2fo 3fo 4fo 5fo 6fo 7fo FREQUENCY VTUNE (V) Pin Description PIN NAME 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 VCC is required. Output power is dependent on external load impedance. OUT- is complementary to OUT+. 5 VCC Supply Voltage Connection. Connect an external bypass capacitor to ground for low noise and low spurious-output content. See Layout Issues for more details. 6 OUT+ Maxim Integrated FUNCTION High-Impedance Open-Collector Output. An external pull-up resistor or inductor to VCC is required. Output power is dependent on external load impedance. OUT+ is complementary to OUT-. 5 MAX2605–MAX2609 45MHz to 650MHz, 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 so that only an external inductor is required to establish the frequency of oscillation and produce a properly operating VCO. The tuning range, biasing, startup, etc., are all managed within the IC. This highly integrated design dramatically simplifies the parts’ application. The tuning range is wide enough so that, with the use of ±2% tolerance inductors, no board-level adjustments to the oscillation frequency are necessary. Once the correct inductor value is chosen, the VCO is guaranteed always to tune to the desired operating frequency. In addition, with the use of inductors of moderate Q (35 to 40), the VCO achieves excellent phase-noise performance. Applications Information Desired Oscillation Frequency The desired VCO operating frequency is set by the value of the external inductance, LF. Figures 1–5 show the inductance value LF required to achieve the desired oscillation frequency. The inductor value can be taken directly from these figures. Inductance must be selected accurately to ensure proper operation over all conditions. that required for LF. Choose LF2 to be a standard-value inductor with a value just less than (LF - L F1 ). L F1 should adhere to the minimum Q requirements, but LF2 may be implemented as a lower-cost, lower-Q, thin-film SMT inductor. Its lower Q has only a small impact on the overall Q of the total inductance because it is