RF SILICON AND SYSTEMS SOLUTIONS

FOR BROADBAND COMMUNICATIONS, AUTOMOTIVE ELECTRONICS AND WIRELESS CONNECTIVITY

M I C R O T U N E

MT1560 UPSTREAM

AMPLIFIER

PRODUCT BRIEF

The MT1560 is a 3.3V programmable

gain upstream amplifier.

The Microtune® MT1560 is a low-

cost programmable-gain power

amplifier IC for use in CATV

upstream applications. The MT1560

is a 3.3 volt part optimized for the

DOCSIS 2.0 upstream standard.

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 MT1560 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 212mA.

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 18mA. A shutdown mode

further reduces current to a nominal

of 80µA.

The MT1560 is available in a 20-

pin MicroLeadFrame™ package

with an exposed pad for the

extended industrial temperature

range of -40°C to +85°C.

MT1560 APPLICATIONS

•

Cable modems

•

Telephony over cable

•

Set-top box CATV

FEATURES

•

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: -51dBmV in 160kHz

•

Low transmit-disable output

noise: -68dBmV

•

Two power-down modes

•

DOCSIS 2.0 compatible

MT1560 Upstream Amplifier