MAX3518ETPT Datasheet, PDF (1/9 Pages) Maxim Integrated Products – DOCSIS 3.0 Upstream Amplifier

19-4390; Rev 0; 2/09
EVAALVUAAILTAIOBNLEKIT
DOCSIS 3.0 Upstream Amplifier
   General Description
The MAX3518 is an integrated CATV upstream ampli-
fier IC designed to meet the DOCSIS 3.0 requirements,
while disspating only 1.25W. The amplifier covers a
5MHz to 85MHz input frequency range (275MHz, 3dB
bandwidth), and is capable of transmitting four QPSK
modulated carriers, each at +58dBmV, simultaneously
within this range. Both input and output ports are dif-
ferential, requiring that an external balun be used at the
output port. The gain is controlled in 1dB steps over a
63dB range using a SPI™ 3-wire interface.
The MAX3518 operates from a single +5V supply. Four
power codes are provided to allow maximum supply
current to be reduced as determined by distortion
requirements. In addition, for each power code, sup-
ply current is automatically reduced as gain is reduced
while maintaining distortion performance. For DOCSIS
3.0 applications, the MAX3518 draws 300mA at 33dB
gain, dropping to 250mA at 31dB gain. The MAX3518
supply current drops to 5mA between bursts to minimize
power dissipation in transmit-disable mode. Control
logic levels are 3.3V CMOS.
The MAX3518 is available in a 20-pin thin QFN pack-
age, and operates over the extended industrial tem-
perature range (-40°C to +85°C).
DOCSIS 3.0 Cable Modems
VOIP Modems
Set-Top Boxes
 Applications
 Features
♦ +5V Supply Voltage
♦ Low Power: 1.25W at 31dB Gain, 64dBmV Output
♦ Ultra-Low 25mW Dissipation in Transmit-Disable
Mode
♦ 63dB Gain Control Range in 1dB Steps
♦ -60dBc Harmonic Distortion at 64dBmV Output
♦ Small 5mm x 5mm Thin QFN Package
♦ Low Burst On/Off Transient
♦ 275MHz, 3dB Bandwidth
 Ordering Information
PART
TEMP RANGE
PIN PACKAGE
MAX3518ETP+ -40°C to +85°C 20 TQFN-EP*
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
Typical Application Circuit appears at end of data sheet.
SPI is a trademark of Motorola, Inc.
N.C.
20
GND 1
   Pin Configuration/Functional Diagram
N.C.
N.C.
V_CC
N.C.
19
18
17
16
15 N.C.
IN+ 2
MAX3518
14 OUT+
IN- 3
13 N.C.
N.C.* 4
GND 5
SERIAL INTERFACE
12 OUT-
11 N.C.*
NOTE: N.C.* PINS MUST
BE LEFT UNCONNECTED.
6
7
8
9
10
SCLK
SDA
CS
TXEN
V_CC
________________________________________________________________ Maxim Integrated Products   1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or
visit Maxim’s website at www.maxim-ic.com.