19-4797; Rev 0; 2/99
1 0 MHz t o 5 0 0 MHz VCO Bu ffe r Am p lifie rs
w it h Diffe re n t ia l Ou t p u t s
0/MAX2471
Ge n e ra l De s c rip t io n
Fe a t u re s
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.
♦ +2.7V to +5.5V Supply Range
♦ Input Frequency Range
High: 10MHz to 500MHz (MAX2470/2471)
Low: 10MHz to 200MHz (MAX2470)
♦ >14dB Power Gain at 200MHz
♦ 64dB Typical Reverse Isolation at 200MHz
♦ Low-Distortion Output Drive
♦ Ultra-Small SOT23-6 Package
♦ High Input Impedance
♦ Single-Ended (MAX2470) or Differential
(MAX2471) Inputs
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.
Ord e rin g In fo rm a t io n
PIN-
PACKAGE
SOT TOP
MARK
PART
TEMP. RANGE
The MAX2470 operates from a single +2.7V to +5.5V
supply. At -5dBm output power, it consumes 5.5mA in
the hig h-fre q ue nc y ra ng e a nd 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.
MAX2470EUT-T -40°C to +85°C
MAX2471EUT-T -40°C to +85°C
6 SOT23-6
6 SOT23-6
AAAX
AAAY
Typ ic a l Op e ra t in g Circ u it s
V
CC
Ap p lic a t io n s
Cellular and PCS Mobile Phones
ISM-Band Applications
HI/LO
MAX2470
BIAS
OUT
OUT
Active Baluns
General-Purpose Buffers/Amplifiers
IN
50Ω
P in Co n fig u ra t io n
50Ω
GND
V
CC
TOP VIEW
OUT
GND
OUT
1
2
3
6
5
4
V
CC
MAX2471
BIAS
MAX2470
MAX2471
OUT
OUT
IN
IN
IN
50Ω
HI/LO (IN)
50Ω
SOT23-6
GND
( ) ARE FOR MAX2471
________________________________________________________________ Maxim Integrated Products
1
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