MT1550 Ver la hoja de datos (PDF) - Unspecified

Número de pieza

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Fabricante

MT1550

UPSTREAM AMPLIFIER

Unspecified 

M I C R O T U NE

RF SILICON AND SYSTEMS SOLUTIONS

FOR BROADBAND COMMUNICATIONS, AUTOMOTIVE ELECTRONICS AND WIRELESS CONNECTIVITY

MT1550 UPSTREAM

AMPLIFIER

PRODUCT BRIEF

The MT1550 is a 3.3V programmable

gain upstream amplifier with integrated

anti-aliasing filter.

MT1550 Upstream Amplifier

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 1.1 upstream

standard. The MT1550 also includes

an on-chip input anti-aliasing filter,

thereby reducing external system

costs.

The device’s specified frequency

range is from 5MHz to 65MHz, and

can output 67dBmV through a 1:1

impedance-ratio transformer. A 3-

wire digital serial bus controls the

variable gain, with gain control

available in 1dB steps and a

nominal 59dB 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 16mVp-p at 61dBmV output

level during transmit enable/disable

switching.

Operating from a single +3.3V

supply, the amplifier’s typical

current draw at maximum gain, or

minimum attenuation, is 259mA.

Additional internal circuitry reduces

the amplifier’s power consumption

depending on gain setting.

Transmit-disable mode power

supply current is reduced to a

nominal of 62mA. A shutdown mode

further reduces current to a nominal

of 70µA.

The MT1550 is available in a 20-

pin MicroLeadFrame™ 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

• Maximum output level of

67dBmV

• Low power-up/down

transients of 16mVp-p typical

at 61dBmV output

• Ultra low third harmonic

distortion

• Single +3.3V supply

• 59dB gain range

• Gain programmable in 1dB

steps

• Low transmit output noise

floor: -50dBmV in 160kHz

• Low transmit-disable output

noise: 1nV / √Hz

• Two power-down modes

• Primarily for set-top boxes

• DOCSIS 1.1 compatible

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