19-1384; Rev 1; 2/99
4 0 0 MHz t o 2 5 0 0 MHz S iGe
Ult ra -Lo w -No is e Am p lifie rs
0/MAX2641
Ge n e ra l De s c rip t io n
Fe a t u re s
The MAX2640/MAX2641 are low-cost, ultra-low-noise
amplifiers designed for applications in the cellular, PCS,
GPS, and 2.4GHz ISM frequency bands. Operating from
a single +2.7V to +5.5V supply, these devices consume
only 3.5mA of current while providing a low noise fig-
ure, high gain, high input IP3, and an operating fre-
quency range that extends from 400MHz to 2500MHz.
♦ Wide Operating Frequency Range
MAX2640: 400MHz to 1500MHz
MAX2641: 1400MHz to 2500MHz
♦ Low Noise Figure
MAX2640: 0.9dB at 900MHz
MAX2641: 1.2dB at 1575MHz
1.3dB at 1900MHz
The MAX2640 is optimized for 400MHz to 1500MHz
applications, with a typical performance of 15.1dB gain,
input IP3 of -10dBm, and a noise figure of 0.9dB at
900MHz. The MAX2641 is optimized for 1400MHz to
2500MHz applications, with a typical performance of
14.4dB gain, an input IP3 of -4dBm, and a noise figure
of 1.3dB at 1900MHz.
1.5dB at 2450MHz
♦ High Gain
MAX2640: 15.1dB at 900MHz
MAX2641: 15.7dB at 1575MHz
14.4dB at 1900MHz
13.5dB at 2450MHz
These devices are internally biased, eliminating the
need for external bias resistors and chokes. In a typical
application, the only external components needed are a
two-element input match, input and output blocking
♦ High Reverse Isolation
MAX2640: 40dB at 900MHz
MAX2641: 31dB at 1575MHz
30dB at 1900MHz
capacitors, and a V bypass capacitor.
CC
24dB at 2450MHz
The MAX2640/MAX2641 are designed on a high-fre-
q ue nc y, low-nois e , a d va nc e d s ilic on-g e rma nium
proc e ss a nd a re offe re d in the sp a c e -sa ving 6-pin
SOT23 package.
♦ +2.7V to +5.5V Single-Supply Operation
♦ Low 3.5mA Supply Current
♦ Ultra-Small SOT23-6 Package
Ap p lic a t io n s
400MHz/900MHz/2.4GHz ISM Radios
Cellular/PCS Handsets
GPS Receivers
Ord e rin g In fo rm a t io n
TEMP.
PIN-
SOT
PART
RANGE
PACKAGE TOP MARK
MAX2640EUT-T -40°C to +85°C 6 SOT23-6
MAX2641EUT-T -40°C to +85°C 6 SOT23-6
AAAV
AAAW
Cordless Phones
Wireless LANs
Pin Configuration appears at end of data sheet.
Wireless Data
Typ ic a l Op e ra t in g Circ u it s
V
CC
C4
C3
V
CC
C2
C3
C4
C1
VALUE
Z1*
ZM1
FREQUENCY (MHz)
ZM2
VALUE
VALUE VALUE VALUE
(pF)
VALUE VALUE
(nH)
BIAS GENERATOR
LNA
(pF)
(pF)
MAX2640 MAX2641 (pF)
(pF)
C1
C2
Z1
900
—
—
—
—
470
100
470
470
3
470
—
9.85
2
—
6.8nH
1pF
RFIN
RF OUT
ZM2
RFIN
RF OUT
1575
1900
2450
100
100
100
470
470
470
—
—
5.6
1
1
1
ZM1
2.55
1.65
MAX2640/1
100
1pF
GND
*The series inductor Z1 can be replaced by a transmission line of appropriate impedance
and electrical length.
________________________________________________________________ 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.
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