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CATV上行放大器

具有业内最低功耗的新型电缆调制解调上行放大器

产品详情

主要特征

应用/用途

简化框图

技术文档

数据资料 CATV上行放大器 Oct 25, 2006

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主要特征

  • Accurate Gain Control
  • Gain Programmable in 0.5dB Steps
  • 56dB of Gain Control Range
  • -55dBc Harmonic Distortion at 65MHz Input
  • Low Burst On/Off Transient
  • High Efficiency:
    • 35mA at +34dBmV Out
    • 8mA Transmit Disable Mode

应用/用途

  • CATV状态监视
  • DOCSIS®/EuroDOCSIS™与DVB线缆调制解调器
  • OpenCable™机顶盒
  • 线缆电话

描述

The MAX3514/MAX3516/MAX3517 programmable-gain amplifiers are designed for use in CATV upstream applications. The MAX3514/MAX3517 drive up to +61dBmV (QPSK) into a 75Ω load when driven with a +34dBmV nominal input signal. The MAX3516 drives up to +64dBmV (QPSK). Both input and output ports are differential, requiring that an external balun be used at the output port. The variable gain feature provides greater than 56dB of dynamic range, which is controlled by an SPI™ 3-wire interface. Gain control is available in 0.5dB steps. The devices operate over a frequency range of 5MHz to 65MHz.

The MAX3514 is a pin-for-pin compatible upgrade for the MAX3510. Like the MAX3510, the MAX3514 is internally matched for use with a 2:1 (voltage ratio) balun. The MAX3517 utilizes an external output resistor for greater load-matching flexibility, and offers the same performance as the MAX3514. The MAX3516 is a higher power version of the MAX3514 with 3dB more gain and output power capability, and is offered in a smaller thermally enhanced TSSOP-EP package.

These devices operate from a single +5VDC supply and draw 120mA during transmit (100% duty cycle, +61dBmV out). The MAX3516 can be operated at up to +9VDC supply for improved harmonic distortion performance. The bias current is automatically adjusted based on the output level to increase efficiency. Additionally, the devices are shut off between bursts to minimize noise and save power while still maintaining a match at the output port. Shutdown mode disables all circuitry and reduces current consumption to 10µA (typ).

The MAX3514/MAX3517 are available in a 20-pin QSOP package and the MAX3516 is available in a 20-pin TSSOP-EP package. All devices operate in the extended industrial temperature range (-40°C to +85°C).

简化框图

MAX3514、MAX3516、MAX3517:典型工作电路 MAX3514、MAX3516、MAX3517:典型工作电路 Zoom icon

技术文档

数据资料 CATV上行放大器 Oct 25, 2006

支持和培训

在Maxim的知识库中搜索技术问题的答案

过滤搜索

Maxim的专业工程师团队也会为您解答相应的技术问题,请访问Maxim的 支持中心