MT1550 データシートの表示（PDF） - Microtune,Inc

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MT1550

UPSTREAM AMPLIFIER

Microtune,Inc 

M I C R O T U NE

MT1550 UPSTREAM

AMPLIFIER

PRODUCT BRIEF

The MT1550 is a 3.3V

programmable gain upstream

amplifier with integrated anti-

aliasing filter.

MT1550 Upstream Amplifier

RF SILICON AND SYSTEMS SOLUTIONS

FOR BROADBAND COMMUNICATIONS, AUTOMOTIVE ELECTRONICS AND WIRELESS CONNECTIVITY

The MT1550 is a low-cost

programmable-gain power amplifier

IC for use in CATV upstream

applications. The Microtune®

MT1550 is a 3.3 volt part optimized

for the DOCSIS® 1.0, 1.1, 2.0 and

Euro-DOCSIS™ upstream standard.

An on-chip input anti-aliasing filter is

included to reduce external system

costs.

The device’s specified frequency

range is from 5 MHz to 65 MHz, with

an output P1dB > 67 dBmV through

a 1:1 impedance-ratio transformer.

A 3-wire digital serial bus controls

the variable gain, with gain control

available in 1 dB steps and a

nominal 59 dB gain range.

The MT1550 may be disabled via

an external control pin. The transmit-

disable mode not only minimizes

output noise by shutting off the

output stage, but also maintains its

output impedance at nominal levels.

Output transients are nominally less

than 16 mVp-p at 61 dBmV output

level during transmit enable/disable

switching.

Operating from a single 3.3 V

supply, the amplifier typically draws

247 mA at maximum gain or

minimum attenuation. Additional

internal circuitry reduces the

amplifier’s power consumption

depending on gain setting.

Transmit-disable mode reduces the

typical current draw to 60 mA, while

shutdown mode further reduces it to

85 µA.

The MT1550 is available in a 20-

pin Quad Flat No-Lead (QFN)

package with an exposed pad for

the extended industrial temperature

range of -40°C to +85°C.

MT1550 APPLICATIONS

• Cable modems

• Telephony over cable

• Set-top box CATV

FEATURES

• Integrated on-chip anti-

aliasing filter

• P1dB of 67 dBmV

• Low power-up/down

transients of 16 mVp-p typical

at 61 dBmV output

• Ultra low third harmonic

distortion

• Single 3.3 V supply

• 59 dB gain range

• Gain programmable in 1 dB

steps

• Low transmit output noise

floor: -50 dBmV in 160 kHz

• Low transmit-disable output

noise: -68 dBmV

• Two power-down modes

• DOCSIS 1.0, 1.1, 2.0 and

Euro-DOCSIS compatible

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