MAX3518 DOCSIS 3.0上行放大器,用于DOCS

MAX3518 DOCSIS 3.0上行放大器,用于DOCSIS 3.0系统

数据资料

The MAX3518 is an integrated CATV upstream amplifier IC designed to meet the DOCSIS 3.0 requirements, while dissipating only 1.25W. The amplifier covers a 5MHz to 85MHz input frequency range (275MHz, 3dB bandwidth), and is capable of transmitting four QPSK modulated carriers, each at +58dBmV, simultaneously within this range. Both input and output ports are differential, requiring than an external balun be used at the output port. The gain is controlled in 1dB steps over a 63dB range using a SPI™ 3-wire interface.

The MAX3518 operates from a single +5V supply. Four power codes are provided to allow maximum supply current to be reduced as determined by distortion requirements. In addition, for each power code, supply current is automatically reduced as gain is reduced while maintaining distortion performance. For DOCSIS 3.0 applications, the MAX3518 draws 300mA at 33dB gain, dropping to 250mA at 31dB gain. The MAX3518 supply current drops to 5mA between bursts to minimize power dissipation in transmit-disable mode. Control logic levels are 3.3V CMOS.

The MAX3518 is available in a 20-pin thin QFN package, and operates over the extended industrial temperature range (-40°C to
+85°C).

关键特性

+5V Supply Voltage
	Low Power: 1.25W at 31dB Gain, 64dBmV Output
	Ultra-Low 25mW Dissipation in Transmit-Disable Mode
	63dB Gain Control Range in 1dB Steps
	-60dBc Harmonic Distortion at 64dBmV Output
	Small 5mm x 5mm Thin QFN Package
	Low Burst On/Off Transient
	275MHz, 3dB Bandwidth

应用/使用

 DOCSIS 3.0电缆调制解调器
 机顶盒
 VOIP调制解调器