MAX3518ETP+ Maxim Integrated Products, MAX3518ETP+ Datasheet

MAX3518ETP+

Manufacturer Part Number

MAX3518ETP+

Description

IC AMP CATV UPSTREAM 3.0 20TQFN

Manufacturer

Maxim Integrated Products

Type

Variable Gain Amplifierr

Datasheet

1.MAX3518ETPT.pdf (9 pages)

Specifications of MAX3518ETP+

Applications

CATV

Mounting Type

Surface Mount

Package / Case

20-WQFN Exposed Pad, 20-DQFN

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

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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).

SPI is a trademark of Motorola, Inc.

19-4390; Rev 0; 2/09

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.

DOCSIS 3.0 Cable Modems

VOIP Modems

Set-Top Boxes

_______________________________________________________________ Maxim Integrated Products 1

NOTE: N.C.* PINS MUST

BE LEFT UNCONNECTED.

General Description

Applications

N.C.*

GND

IN+

IN-

DOCSIS 3.0 Upstream Amplifier

SCLK

N.C.

SERIAL INTERFACE

N.C.

SDA

MAX3518

Pin Configuration/Functional Diagram

N.C.

+Denotes a lead(Pb)-free/RoHS-compliant package.

*EP = Exposed pad.

♦ +5V Supply Voltage

♦ Low Power: 1.25W at 31dB Gain, 64dBmV Output

♦ Ultra-Low 25mW Dissipation in Transmit-Disable

♦ 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

Typical Application Circuit appears at end of data sheet.

Mode

MAX3518ETP+

TXEN

PART

N.C.

OUT+

N.C.

OUT-

N.C.*

-40°C to +85°C

TEMP RANGE

Ordering Information

PIN PACKAGE

20 TQFN-EP*

Features

Related parts for MAX3518ETP+

MAX3518ETP+ Summary of contents

Page 1

... Harmonic Distortion at 64dBmV Output ♦ Small 5mm x 5mm Thin QFN Package ♦ Low Burst On/Off Transient ♦ 275MHz, 3dB Bandwidth PART MAX3518ETP+ +Denotes a lead(Pb)-free/RoHS-compliant package. *EP = Exposed pad. Applications Typical Application Circuit appears at end of data sheet. Pin Configuration/Functional Diagram N ...

Page 2

DOCSIS 3.0 Upstream Amplifier ABSOLUTE MAXIMUM RATINGS V to GND ...........................................................-0.3V to +5.5V CC IN+, IN- ...................................................... -0. OUT+, OUT- ............................................... -0. TXEN, SDA, SCLK, CS .........................................-0.3V to +4.2V RF Input Power ............................................................... +10dBm Note 1: ...

Page 3

AC ELECTRICAL CHARACTERISTICS (continued) (Typical Application Circuit as shown, V fied. Typical values are 5V Transmit-Disable Mode Noise Isolation in Transmit-Disable Mode Noise Figure NF Noise Figure Slope Transmit-Disable/Transmit- Enable Transient Duration Transmit-Disable/Transmit- Enable ...

Page 4

DOCSIS 3.0 Upstream Amplifier (MAX3518 EV kit +5V 33dBmV SUPPLY CURRENT vs. GAIN CODE 350 300 250 200 150 100 ...

Page 5

EV kit +5V 33dBmV 2ND HARMONIC DISTORTION vs. INPUT FREQUENCY - +64dBmV 1.25W OUT DISS -55 - +85°C A -65 -70 -75 - +25°C ...

Page 6

DOCSIS 3.0 Upstream Amplifier PIN NAME 1, 5 GND Ground 2 IN+ Positive PGA Input 3 IN- Negative PGA Input 4, 11 N.C. No Connection. These pins must remain open. 6 SCLK Serial Interface Clock 7 SDA Serial Interface Data ...

Page 7

Table 2. Reg 00 Gain Control BIT LOCATION BIT NAME (0 = LSB) PC[1:0] 7,6 GC[5:0] 5,4,3,2,1,0 Table 3. Initialize Register BIT LOCATION BIT NAME (0 = LSB) — 7,6,5,4,3,2,1,0 t SENS CS SCLK t SDAS SDA A3 Figure 1. ...

Page 8

DOCSIS 3.0 Upstream Amplifier resistance on the secondary winding. Operating in a 75Ω system tends to shift the low-frequency edge of the transformer bandwidth specification factor of 1.5 due to primary inductance. Keep this in mind when ...

Page 9

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2009 Maxim Integrated Products DOCSIS 3 ...

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