MAX3503 Datasheet, PDF (1/13 Pages) Maxim Integrated Products – Upstream CATV Amplifier

19-2339; Rev 1; 3/02
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Upstream CATV Amplifier
General Description
The MAX3503 programmable power amplifier is
designed for use in CATV upstream applications. The
MAX3503 drives 61dBmV (QPSK) into a 75Ω load when
driven with a 34dBmV nominal input signal. Both input
and output ports are differential, requiring that an exter-
nal balun be used at the output port. The variable gain
feature provides greater than 56dB of dynamic range,
which is controlled by an SPI™ 3-wire interface. Gain
control is available in 0.5dB steps. The device operates
over a frequency range of 5MHz to 65MHz. The
MAX3503 is internally matched for use with a 1:1 balun.
This device operates from a single 3.3V DC supply and
draws 235mA during transmit (100% duty cycle,
61dBmV out). The bias current is automatically
adjusted, based on the output level to increase efficien-
cy. Additionally, the device can be disabled between
bursts to minimize noise and save power while main-
taining a match at the output port. A shutdown mode is
available to disable all circuitry and reduce current con-
sumption to 5µA (typ).
The MAX3503 is available in a 20-pin QFN package.
The device operates in the extended industrial temper-
ature range (-40°C to +85°C).
Features
o Single 3.3V Supply Operation
o Accurate Gain Control, ±1dB over 53dB Range
o Gain Programmable in 0.5dB Steps
o -55dBc Harmonic Distortion at 65MHz
o Low Burst On/Off Transient
o High Efficiency: 182mW at 34dBmV Out;
16mW in Transmit-Disable Mode
Ordering Information
PART
MAX3503EGP
*Exposed pad.
TEMP RANGE
-40°C to +85°C
PIN-PACKAGE
20 QFN-EP* (5mm × 5mm)
________________________Applications
DOCSIS/EuroDOCSIS and DVB Cable
Modems
OpenCable Set-Top Box
Telephony Over Cable
CATV Status Monitor
Typical Operating Circuit appears at end of data sheet.
SPI is a trademark of Motorola, Inc.
DOCSIS/EuroDOCSIS/OpenCable are trademarks of
CableLabs^®.
TOP VIEW
GND
V_{CC 1}
IN+ 2
GND 3
IN- 4
GND 5
GND
Pin Configuration
MAX3503
GND
15 V_CC
14 OUT+
13 N.C.
12 OUT-
11 N.C.
GND
QFN**
**NOTE: CORNER GND PINS AND THE EXPOSED PAD MUST BE
SOLDERED TO THE SUPPLY GROUND.
________________________________________________________________ Maxim Integrated Products 1
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