UPSTREAM AMPLIFIER
Description
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M I C R O T U N E™
MT1530 UPSTREAM AMPLIFIER ADVANCE DATA SHEET
1 APPLICATIONS
• • • Cable modems Telephony over cable Set-top box CATV
CATV APPLICATIONS
2 FEATURES
• • • • • • • • • • • • Lowest power consumption upstream amplifier available Maximum output level of 64 dBmV Low power-up/down transients of 4 mVp-p typical at 59 dBmV output Best in class second harmonic distortion Ultra low third harmonic distortion Single +5V supply 63-dB Gain range Gain programmable in 1-dB steps Low transmit output noise floor: 131 nV / √Hz Low transmit-disable output noise: 810 pV / √Hz Two power-down modes DOCSIS and EuroDOCSIS compatible
Preliminary and Proprietary
3 OVERVIEW
The Microtune 1530 (MT1530) is a low-cost programmable-gain power amplifier IC for use in CATV upstream applications.
Specifically, the MT1530 is optimized for the DOCSIS upstream standard.
The device operates at a frequency range from 5 MHz to 65 MHz, and can output 64 dBmV through a 4:1 impedance-ratio transformer.
Second harmonic distortion is typically less than -70 dBc, and third harmonic distortion is typically less than -55 dBc at a 59 dBmV output level.
A 3-wire digital serial bus controls the variable gain, with gain control available in 1-dB steps and a nominal 63-dB gain range.
The MT1530 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 glitch transients are nominally less than 4 mV at maximum gain settings during transmit enable/disable switching.
Operating from a single +5V supply, the amplifier’s typical current draw at maximum gain, or minimum attenuation, is 102 mA.
Additionally, internal circuitry reduces the amplifier’s power consumption depending on gain setting.
Transmit-disable mode power supply current is reduced to a nominal of 14 mA.
A shutdown mode further reduces current to a nominal of 130 µA.
The MT1530...
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