Rainbow Electronics MAX2645 - Manual

General Description
The MAX2645 is a versatile, high-linearity, low-noise
amplifier designed for 3.4GHz to 3.8GHz wireless local
loop (WLL), wireless broadband access, and digital
microwave radio applications. The device features an
externally adjustable bias control, set with a single resis-
tor, that allows the user to meet minimum linearity require-
ments while minimizing current consumption. The
amplifier’s high-gain, low-noise performance and
adjustable input third-order intercept (IP3) allow it to be
used as a low-noise amplifier (LNA) in the receive path, a
PA predriver in the transmit path, or as an LO buffer.
The MAX2645 features a logic-level gain control that pro-
vides a 25dB step reduction in gain, which improves IP3
performance for operation during high input signal level
conditions. Supply current is reduced from 9mA in high-
gain mode to 3mA in low-gain mode. The device also
includes a logic-controlled shutdown mode, which
reduces supply current to 0.1µA. The MAX2645 operates
from a +3V to +5.5V supply and is offered in the miniature
10-pin µMAX package (5mm
✕ 3mm) with an exposed
paddle. Its performance has been optimized for use with
the MAX2683/MAX2684 3.5GHz SiGe mixers to provide a
complete high-performance, front-end solution for 3.5GHz
applications.
Applications
Wireless Local Loop
Wireless Broadband Access
Digital Microwave Radios
Features
♦ 3.4GHz to 3.8GHz Frequency Range
♦ LNA Performance (High/Low-Gain Modes)
Gain: +14.4dB/-9.7dB
NF: 2.3dB/15.5dB
Input IP3: +4dBm/+13dBm
Supply Current: 9.2mA/2.7mA
♦ Highly Versatile Application
Receive Path 1st and 2nd Stage LNA
Transmit PA Predriver
LO Buffer
♦ Adjustable IP3 and Supply Current
♦ 0.1µA Supply Current in Shutdown Mode
♦ +3.0V to +5.5V Single-Supply Operation
♦ 10-Pin µMAX-EP Package (5.0mm x 3.0mm)
MAX2645
________________________________________________________________ Maxim Integrated Products 1
19-1759; Rev 0; 7/00
For free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
3.4GHz to 3.8GHz SiGe
Low-Noise Amplifier/PA Predriver
Ordering Information
Pin Configuration appears at end of data sheet.
PART TEMP. RANGE PIN-PACKAGE
MAX2645EUB -40 °C to +85°C 10 µMAX-EP*
*Exposed paddle
APPLICATION
CIRCUIT
LNA, LOW NF 14.4/-9.7 2.3/15.5 +4/+13
+10/+15.5
+11.8/+16.2
2.6/16
2.6/16
14.9/-10.7
15.2/-9.7
LNA, HIGH IP3
PA PREDRIVER
GAIN
(dB)
NF
(dB)
IIP3
(dBm)
MAX2645
BIAS AND POWER
MANAGEMENT
RFIN
Z1
RF
INPUT
3.5GHz
C1
HIGH
GAIN
LOW
GAIN
GND
GAIN STEP
SHUTDOWN LOGIC
INPUTS
R BIAS
RADIAL STUB
V CC
RF
OUTPUT
T LINE
Typical Operating Circuit
EVALUATION KIT MANUAL
FOLLOWS DATA SHEET