MAX3558 Datasheet, PDF (1/8 Pages) Maxim Integrated Products – Quad-Output LNA with AGC for Cable TV Applications

19-3025; Rev 1; 6/06
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Quad-Output LNA with AGC for
Cable TV Applications
General Description
The MAX3558 broadband quad-output low-noise ampli-
fier (LNA) is designed for digital set tops and digital ter-
restrial applications. The LNA covers a 50MHz to
878MHz input frequency range, while integrating a sep-
arate automatic gain-control (AGC) function with over
30dB of control range for each of four balanced out-
puts. Each output has its own shutdown control to
reduce power consumption when not used. The
MAX3558 also includes a power detector that can be
used to close the loop on any of the AGCs to prevent
overload conditions. The LNA’s attack point is
adjustable with an external resistor. The MAX3558 is
available in a very small 28-pin QFN package with
exposed paddle (EP).
Applications
Digital Set-Top Boxes
Digital Terrestrial Receivers
Tuner Preamps
Features
♦ Quad Outputs with Independent AGCs and
Shutdown
♦ 50MHz to 878MHz Broadband Operation
♦ Integrated Power Detector
♦ High Linearity: 15.6dBm IIP3
Ordering Information
PART
TEMP RANGE ^PIN-
PACKAGE
PKG
CODE
MAX3558CGI 0°C to +70°C
28 QFN-EP*
(5mm x 5mm)
g2855-2
MAX3558CTI+ 0°C to +70°C
*EP = Exposed paddle.
+Denotes lead-free package.
28 QFN-EP*
(5mm x 5mm)
t2855-3
Pin Configuration/Functional Diagram
TOP VIEW
28 27 26 25 24 23 22
BIAS 1
LB 2
RFIN+ 3
RFIN- 4
V_CC 5
PDAGC 6
PDOUT 7
MAX3558
POWER
DETECTOR
8 9 10 11 12 13 14
21 OUT2+
20 OUT2-
19 AGC2
18 GND
17 AGC3
16 OUT3-
15 OUT3+
EXPOSED PADDLE IS CONNECTED TO GND
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.