MT1530 Datasheet, PDF (1/14 Pages) List of Unclassifed Manufacturers – UPSTREAM AMPLIFIER

M I C R O T U N E™
MT1530 UPSTREAM AMPLIFIER
ADVANCE DATA SHEET
CATV APPLICATIONS
1 APPLICATIONS
• Cable modems
• Telephony over cable
• Set-top box CATV
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
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 is available in a 20-pin SSOP package for the extended industrial
temperature range of -40°C to +85°C.
DS-00010
Rev 1.2 — December 2000
Page 1 of 14