|Category||Communication => Wireless|
|Description||10mhz to 1050mhz Integrated RF Oscillator With Buffered Outputs|
|Company||Maxim Integrated Products|
|Datasheet||Download MAX2620EUA datasheet
Low-Phase-Noise Oscillator: -110dBc/Hz (25kHz offset from carrier) Attainable Operates from Single to +5.25V Supply Low-Cost Silicon Bipolar Design Two Output Buffers Provide Load Isolation Insensitive to Supply Variations Low, 27mW Power Consumption (VCC = 3.0V) Low-Current Shutdown Mode: 0.1µA (typ)
The MAX2620 combines a low-noise oscillator with two output buffers in a low-cost, plastic surface-mount, ultra-small µMAX package. This device integrates functions typically achieved with discrete components. The oscillator exhibits low-phase noise when properly mated with an external varactor-tuned resonant tank circuit. Two buffered outputs are provided for driving mixers or prescalers. The buffers provide load isolation to the oscillator and prevent frequency pulling due to load-impedance changes. Power consumption is typically just 27mW in operating mode (VCC = 3.0V), and drops to less than 0.3µW in standby mode. The MAX2620 operates from a single to +5.25V supply.
Analog Cellular Phones Digital Cellular Phones 900MHz Cordless Phones 900MHz ISM-Band Applications Land Mobile Radio Narrowband PCS (NPCS)PART MAX2620EUA MAX2620E/D TEMP RANGE to +85°C PIN-PACKAGE 8 µMAX Dice*
*Dice are tested +25°C, DC parameters only. Pin Configuration appears at end of data sheet.
VCC C17 1.5pF VTUNE 1k D1 ALPHA SMV1204-34 CERAMIC RESONATOR 1pF 4 SHDN BIAS SUPPLY 1 VCC1 OUT 8 1.5pF VCC
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com.
to +6V TANK, SHDN GND.................................-0.3V to (VCC + 0.3V) OUT, OUT to GND...........................(VCC 0.6V) to (VCC + 0.3V) FDBK to GND..................................(VCC 2.0V) to (VCC + 0.3V) Continuous Power Dissipation (TA = +70°C) µMAX (derate 5.7mW/°C above +70°C).....................457mW Operating Temperature Range to +85°C Junction Temperature......................................................+150°C Storage Temperature to +165°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.
to +5.25V, FDBK = open, TANK = open, OUT and OUT connected to VCC through 50, SHDN to +85°C, unless otherwise noted. Typical values measured = +25°C.) (Note 1) PARAMETER Supply Current Shutdown Current Shutdown Input Voltage High Shutdown Input Voltage Low Shutdown Bias Current High Shutdown Bias Current Low SHDN = 2.0V SHDN 0.6V 5.5 SHDN = 0.6V CONDITIONS MIN TYP 9.0 0.1 MAX 12.5 2 UNITS V µA
Note 1: Specifications are production tested and guaranteed = +25°C and = +85°C. Specifications are guaranteed by design and characterization = -40°C.
(Test Circuit of Figure = +3.0V, SHDN , Z LOAD = Z SOURCE (50 f TEST = +25°C, unless otherwise noted.) PARAMETER Frequency Range Reverse Isolation Output Isolation CONDITIONS to +85°C (Note 2) OUT or OUT to TANK; OUT, OUT driven = -20dBm OUT to OUT MIN 50 33 TYP MAX 1050 UNITS MHz dB
Note 2: Guaranteed by design and characterization 650MHz, 900MHz, and 1050MHz. Over this frequency range, the magnitude of the negative real impedance measured at TANK is greater than one-tenth the magnitude of the reactive impedances at TANK. This implies proper oscillator start-up when using an external resonator tank circuit with 10. C3 and C4 must be tuned for operation at the desired frequency.TYPICAL OPERATING CIRCUIT PERFORMANCE--900MHz Band CeramicResonator-Based Tank
(Typical Operating Circuit, VCC = +3.0V, VTUNE = 1.5V, SHDN = VCC, load at OUT = 50, load at OUT L1 = coaxial ceramic resonator: Trans-Tech = +25°C, unless otherwise noted.) PARAMETER Tuning Range Phase Noise VTUNE to 3.0V SSB = 25kHz SSB 300kHz At OUT (Note 2) Output Power (Single-Ended) At OUT, per test circuit of Figure to +85°C (Note 3) At OUT (Note 3) Noise Power Average Tuning Gain Second-Harmonic Output Load Pull Supply Pushing VSWR = 1.75:1, all phases VCC stepped from -11 -16 CONDITIONS MIN TYP dBm/Hz MHz/V dBc kHzP-P kHz/V dBm MAX UNITS MHz dBc/HzTYPICAL OPERATING CIRCUIT PERFORMANCE--900MHz Band Inductor-Based Tank
(Typical Operating Circuit, VCC = +3.0V, VTUNE = 1.5V, SHDN = VCC, load at OUT = 50, load at OUT = 5nH (Coilcraft = +25°C, unless otherwise noted.) PARAMETER Tuning Range Phase Noise VTUNE to 3.0V SSB = 25kHz SSB 300kHz At OUT (Note 2) Output Power (single-ended) At OUT, per test circuit of Figure to +85°C (Note 3) At OUT (Note 3) Noise Power Average Tuning Gain Second-Harmonic Output Load Pull Supply Pushing VSWR = 1.75:1, all phase angles VCC stepped from -11 -16 CONDITIONS MIN TYP dBm/Hz MHz/V dBc kHzP-P kHz/V dBm MAX UNITS MHz dBc/Hz
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