19-1764; Rev 2; 6/05
Low-Noise, High-Linearity
Broadband Amplifier
General Description
The MAX3524 broadband amplifier is designed specifi-
cally for cable television receiver and cable modem
applications. The MAX3524 is a single-ended input, dif-
ferential-output low-noise amplifier (LNA) that offers
15dB of gain. It operates from a +4.75V to +5.25V sin-
gle supply from 44MHz to 880MHz. The MAX3524
includes an operational amplifier that is used to control
an off-chip PIN attenuator circuit at the input of the LNA.
The attenuator is typically used to regulate the input
signal to a value that maintains high linearity for large
signals. The MAX3524 is available in a 10-pin μMAX ?
package with an exposed paddle (EP) and operates in
the extended temperature range (-40°C to +85°C).
Applications
Features
o Single-Ended Input, Differential Output
o +4.75V to +5.25V Single-Supply Operation
o Broadband Operation: 44MHz to 880MHz
o Low Noise Figure: 4.2dB
o High Linearity: IIP2 (42dBm), IIP3(14dBm)
o Voltage Gain: 15dB
o Independent On-Chip Op Amp
Ordering Information
Cable Modems
Cable Set-Top Boxes
Broadband Amplifiers
CATV Infrastructures
PART
MAX3524EVB
MAX3524EVB+
* EP = Exposed paddle.
TEMP RANGE
-40 ° C to +85 ° C
-40 ° C to +85 ° C
PIN-PACKAGE
10 μMAX-EP*
10 μMAX-EP*
+ Denotes lead-free package.
μMAX is a registered trademark of Maxim Integrated Products, Inc.
Typical Application Circuit
V CC = 5V
10 μ F
1
V CC
RFOUT- 10
0.1 μ F
L1 = 0.5nH TO 1nH
C L < 1.8pF
INPUT:
44-880MHz
75 ? TO 2k ?
PIN
ATTENUATOR
0.1 μ F
10nF
2
3
RFIN
RFGND
MAX3524
V CC
RFOUT+
9
8
0.1 μ F
OUTPUT TO TUNER
(DIFFERENTIAL DRIVE)
V CC = 5V
10 μ F
L2 = 0.5nH TO 1nH
R1
4
OPOUT
OPIN+
7
0.1 μ F
FROM DEMOD IC
TO CONTROL PIN
ATTENUATOR
3k ?
D2
OP AMP
R2
3k ?
CMDSH-3
5
OPIN-
GND
*
BIAS
6
R BIAS = 5.9 ?
L BIAS = 680nH
D1
CMDSH-3
*EXPOSED PADDLE
Pin Configuration appears at end of data sheet.
________________________________________________________________ Maxim Integrated Products
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.
1
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