MAX2624EUA+中文资料
General Description
The MAX2622/MAX2623/MAX2624 self-contained volt-age-controlled oscillators (VCOs) combine an integrat-ed oscillator and output buffer in a miniature 8-pin μMAX package.
The inductor and varactor elements of the tank circuits are integrated on-chip, greatly simplifying application of the part. In addition, the center frequency of oscillation and frequency span are factory preset to provide a guaranteed frequency range versus control voltage. An external tuning voltage controls the oscillation frequency.The output signals are buffered by an amplifier stage matched on-chip to 50?.
The MAX2622/MAX2623/MAX2624 operate from a +2.7V to +5.5V supply voltage and require only 8mA of supply current. In shutdown mode, the supply current is reduced to 0.1μA.
Applications
866MHz to 868MHz European ISM Band (MAX2622)
DECT 1/2 Frequency LO (MAX2623)902MHz to 928MHz ISM Band, ±10.7MHz IF (MAX2623)
902MHz to 928MHz ISM Band, 45MHz to 70MHz IF (MAX2624)
Features
o Fully Monolithic
o Guaranteed Performance o On-Chip 50?Output Match o Wide Choice of Frequencies
855MHz to 881MHz (MAX2622)885MHz to 950MHz (MAX2623)947MHz to 998MHz (MAX2624)o +2.7V to +5.5V Single-Supply Operation o Low-Current Shutdown Mode
o Smaller than Modules (8-Pin μMAX Package)
MAX2622/MAX2623/MAX2624
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Maxim Integrated Products 1
Ordering Information
Typical Operating Circuit
Pin Configuration appears at end of data sheet.
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M A X 2622/M A X 2623/M A X 2624
Monolithic Voltage-Controlled Oscillators 2_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
DC ELECTRICAL CHARACTERISTICS
(Typical Operating Circuit , V CC = +2.7V to +5.5V, V TUNE = 1.4V, V SHDN = 2V, OUT = unconnected, T A = -40°C to +85°C, unless otherwise noted. Typical values are at V CC = +3V, T A = +25°C.) (Note 1)
AC ELECTRICAL CHARACTERISTICS
(Typical Operating Circuit,V CC = +2.7V to +5.5V, V TUNE = 0.4V to 2.4V, V SHDN = 2V, T A = +25°C, unless otherwise noted. Typical values measured at V CC = +3V.) (Note 1)
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.
Note 1:Specifications are production tested at T A = +25°C. Limits over temperature are guaranteed by design and characterization.Note 2:Tuning gain is measured at V TUNE = 0.4V with a 0.2V step to 0.6V. At low V TUNE , tuning gain is highest.Note 3:Measurements taken on MAX262_ EV kit.
V CC to GND..............................................................-0.3V to +6V TUNE, SHDN to GND.................................-0.3V to (V CC + 0.3V)OUT to GND...............................................-0.3V to (V CC + 0.6V)Continuous Power Dissipation (T A = +70°C)
8-Pin μMAX (derate 5.7mW/°C above T A = +70°C).....457mW
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
MAX2622/MAX2623/MAX2624
Monolithic Voltage-Controlled Oscillators
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3
00.5
1.0
1.5
2.0
-40
-20
20
40
60
80
SHUTDOWN SUPPLY CURRENT
vs. TEMPERATURE
TEMPERATURE (°C)
S U P P L Y C U R R E N T (μA )
78
9
10-40
20
-20
40
60
80
SUPPLY CURRENT vs. TEMPERATURE
M A X 2622/23/24-01
TEMPERATURE (°C)
S U P P L Y C U R R E N T (m A )
-130
-110-120-90-100-70-80-6010
100
1000
PHASE NOISE
M A X 2622-03
OFFSET FREQUENCY (kHz)
P H A S E N O I S E (d B c )
750
800850900
95010000
1.0
0.5
1.5
2.0
2.5
3.0
MAX2622
VCO TUNING CURVE
V TUNE (V)
F R E Q U E N C Y (M H z )
800
850900
950
10001050
1.0
0.5
1.5
2.0
2.5
3.0
MAX2623
VCO TUNING CURVE
V TUNE (V)
F R E Q U E N C Y (M H z )
850
900
950
1000
10501100
1.0
0.5
1.5
2.0
2.5
3.0
MAX2624
VCO TUNING CURVE
V TUNE (V)
F R E Q U E N C Y (M H z )
f O
2f O
3f O
NORMALIZED HARMONIC OUTPUT SPECTRUM
FREQUENCY
O U T P U T P O W E R
Typical Operating Characteristics
(V CC = +3.0V, V TUNE = 0.4V to 2.4V, V SHDN = 2V, T A = +25°C, unless otherwise noted.)
M A X 2622/M A X 2623/M A X 2624
Detailed Description
Oscillator
The MAX2622/MAX2623/MAX2624 VCOs are imple-mented as an L C oscillator topology, integrating all of the tank components on-chip. This fully monolithic approach provides an extremely easy-to-use VCO,equivalent to a VCO module. The frequency is con-trolled by a voltage applied to the TUNE pin, which is internally connected to the varactor. The VCO core uses a differential topology to provide a stable frequen-cy versus supply voltage and improve the immunity to load variations. In addition, there is a buffer amplifier following the oscillator core to provide added isolation from load variations and to boost the output power.
Output Buffer
The oscillator signal from the core drives an output buffer amplifier. The amplifier is constructed as a com-mon-emitter stage with an integrated on-chip reactive output match. No external DC blocking capacitor is required, eliminating the need for any external compo-nents. The output amplifier has its own V CC and GND pins to minimize load-pulling effects. The amplifier boosts the oscillator signal to a level suitable for driving most RF mixers.
Applications Information
Tune Input
The tuning input is typically connected to the output of the PL L loop filter. The loop filter is presumed to pro-vide an appropriately low-impedance source. It may incorporate an extra RC filter stage to reduce high-fre-quency noise and spurious signals. Any excess noise on the tuning input is directly translated into FM noise,which can degrade the phase-noise performance of the oscillator. Therefore, it is important to minimize the noise introduced on the tuning input. A simple RC filter with low corner frequency is needed during testing in order to filter the noise present on the voltage source driving the tuning line.
Layout Issues
Always use controlled impedance lines (microstrip,coplanar waveguide, etc.) for high-frequency signals.Always place decoupling capacitors as close to the V CC pins as possible; for long V CC lines, it may be nec-essary to add additional decoupling capacitors located further from the device. Always provide a low-induc-tance path to ground, and keep GND vias as close to the device as possible. Thermal reliefs on GND pads are not recommended.
Monolithic Voltage-Controlled Oscillators 4_______________________________________________________________________________________
Pin Description
MAX2622/MAX2623/MAX2624
Monolithic Voltage-Controlled Oscillators
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Figure 1. Typical Application Circuit
M A X 2622/M A X 2623/M A X 2624
Monolithic Voltage-Controlled Oscillators 6_______________________________________________________________________________________
Package Information