The Microtune® MT1560 is a lowcost 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.

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 APPLICATIONS

• Cable modems

• Telephony over cable

• Set-top box CATV