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PDF MAX2471EUT-T Data sheet ( Hoja de datos )
| Número de pieza | MAX2471EUT-T | |
| Descripción | 10MHz to 500MHz VCO Buffer Amplifiers with Differential Outputs | |
| Fabricantes | Maxim Integrated | |
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19-4797; Rev 0; 2/99
10MHzEVFAOLLULAOTWIOSNDKAITTAMSAHNEUEATL to 500MHz VCO Buffer Amplifiers
with Differential Outputs
General Description
The MAX2470/MAX2471 are flexible, low-cost, high-
reverse-isolation buffer amplifiers for applications with
discrete and module-based VCO designs. Both feature
differential 50Ω outputs for driving a single differential
(balanced) load or two separate single-ended (unbal-
anced) 50Ω loads. The MAX2470 offers a single-ended
input and has two selectable frequency ranges of oper-
ation: 10MHz to 500MHz and 10MHz to 200MHz. The
MAX2471 offers a differential input and operates from
10MHz to 500MHz. The MAX2470/MAX2471 also feature
high input impedance for maximum flexibility, enabling
them to be used with a variety of oscillator topologies.
High reverse isolation combined with low supply current
make them ideal for applications requiring high perfor-
mance with low power.
These devices are also ideal for use as active baluns.
The MAX2470 converts a single-ended input to a differ-
ential output. The MAX2471 is useful as a differential
buffer stage or to convert from a differential input to two
single-ended outputs.
The MAX2470 operates from a single +2.7V to +5.5V
supply. At -5dBm output power, it consumes 5.5mA in
the high-frequency range and only 3.6mA in the
low-frequency range. The MAX2471 operates from a
+2.7V to +5.5V single supply and consumes 5.5mA.
Both devices are available in ultra-small SOT23-6 plas-
tic packages, requiring minimal board space.
Applications
Cellular and PCS Mobile Phones
ISM-Band Applications
Active Baluns
General-Purpose Buffers/Amplifiers
Pin Configuration
TOP VIEW
OUT 1
6 VCC
MAX2470
GND 2 MAX2471 5 IN
OUT 3
4 HI/LO (IN)
( ) ARE FOR MAX2471
SOT23-6
Features
o +2.7V to +5.5V Supply Range
o Input Frequency Range
High: 10MHz to 500MHz (MAX2470/2471)
Low: 10MHz to 200MHz (MAX2470)
o >14dB Power Gain at 200MHz
o 64dB Typical Reverse Isolation at 200MHz
o Low-Distortion Output Drive
o Ultra-Small SOT23-6 Package
o High Input Impedance
o Single-Ended (MAX2470) or Differential
(MAX2471) Inputs
Ordering Information
PART
TEMP. RANGE
MAX2470EUT-T -40°C to +85°C
MAX2471EUT-T -40°C to +85°C
PIN-
PACKAGE
6 SOT23-6
6 SOT23-6
SOT TOP
MARK
AAAX
AAAY
Typical Operating Circuits
VCC
HI/LO
BIAS MAX2470
OUT
IN 50Ω
OUT
GND
VCC
50Ω
BIAS MAX2471
IN OUT
50Ω
IN OUT
50Ω
GND
________________________________________________________________ Maxim Integrated Products 1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
1 page  
10MHz to 500MHz VCO Buffer Amplifiers
with Differential Outputs
Typical Operating Characteristics (continued)
(VCC = +3.0V, MAX2470 output and MAX2471 input and output measurements taken differentially, TA = +25°C unless otherwise
noted.)
MAX2470
OUTPUT VSWR vs. FREQUENCY
1.50
HI/LO = VCC
INPUT TERMINATED IN 50Ω
SINGLE-ENDED MEASUREMENT
OUT
1.25
OUT
MAX2470
OUTPUT ISOLATION vs. FREQUENCY
90
HI/LO = VCC
80 SINGLE-ENDED
MEASUREMENT
70 OUT TO IN
60 OUT TO IN
50
MAX2471
OUTPUT POWER vs. INPUT POWER
2
0
-2 fIN = 200MHz
-4 fIN = 500MHz
-6
-8
40
OUT TO OUT
30 INPUT TERMINATED IN 50Ω
-10
-12
1.00
0
17.5
17.0
100 200 300 400
FREQUENCY (MHz)
MAX2471
DIFFERENTIAL TRANSDUCER
POWER GAIN vs. FREQUENCY
500
TA = +25°C
16.5
16.0 TA = +85°C
TA = -40°C
15.5
15.0
14.5
20
0
100 200 300 400
FREQUENCY (MHz)
500
MAX2471
NOISE FIGURE vs. FREQUENCY
8.50
-14
-30 -28 -26 -24 -22 -20 -18 -16 -14 -12 -10
INPUT POWER (dBm)
MAX2471
REAL INPUT IMPEDANCE vs. FREQUENCY
10,000
8.25
1000
8.00
100
7.75
7.50 10
14.0
0 50 100 150 200 250 300 350 400 450 500
FREQUENCY (MHz)
MAX2471
IMAGINARY INPUT IMPEDANCE
vs. FREQUENCY
500
7.25
0 50 100 150 200 250 300 350 400 450 500
FREQUENCY (MHz)
MAX2471
OUTPUT VSWR vs. FREQUENCY
1.50
INPUT TERMINATED
SINGLE-ENDED MEASUREMENT
1
0 50 100 150 200 250 300 350 400 450 500
FREQUENCY (MHz)
MAX2471
OUTPUT ISOLATION vs. FREQUENCY
90
SINGLE-ENDED
80 MEASUREMENT
0 VSWR OUT
1.25 VSWR OUT
-500
-1000
0
100 200 300 400
FREQUENCY (MHz)
500
1.00
0
100 200 300 400
FREQUENCY (MHz)
500
70
60
50
40
30
20
0
OUT TO IN
OUT TO OUT
INPUT TERMINATED IN 50Ω
100 200 300 400
FREQUENCY (MHz)
500
_______________________________________________________________________________________ 5
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| PDF Descargar | [ Datasheet MAX2471EUT-T.PDF ] | |
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