MAX3523 Low-Power DOCSIS 3.1 Programmable-Gain Amp

By Maxim Integrated 162

MAX3523 Low-Power DOCSIS 3.1 Programmable-Gain Amp

Maxim’s amplifier portfolio includes a wide selection of operational amplifiers (op-amps), current-sense amplifiers, and comparators for signal conditioning, monitoring, and control applications. Maxim's line of op-amps includes ICs for precision and low noise, high voltage, low power, and space savings, as well as those with CMOS inputs. In addition, Maxim's current-sense amplifiers, which monitor current flow through a shunt (sense) resistor and provide closed-loop feedback of system loads, are designed for high-side and low-side sensing and also for unidirectional and bidirectional current flow through the sense resistor. Finally, Maxim's comparators include ICs with low pin counts that do not require a separate power pin.

Maxim's MAX3523 low-power upstream programmable-gain amplifier is designed to exceed DOCSIS 3.1 upstream transmit requirements. The MAX3523 transmits a combined output power of 68 dBmV over the RF bandwidth of 5 MHz to 204 MHz. An SPI 3-wire interface controls the gain in 1 dB steps over a 60 dB range. The device, available in a 20-pin 5 mm x 5 mm x 0.75 mm TQFN package, delivers high dynamic range and minimizes power dissipation under a +5 V supply rail. The MAX3523 is ideal for cable modems and customer premises equipment.

Features
  • Delivers +68 dBmV output power while meeting DOCSIS 3.1 requirements
  • Covers 5 MHz to 204 MHz output bandwidth
  • 3.5 W power consumption with 5 V supply voltage
  • Programmable power codes allow operation at reduced power dissipation
  • Exceeds spurious requirements with fully-loaded OFDM allocation at +65 dBmV at modem output
  • 20-pin 5 mm x 5 mm x 0.75 mm TQFN package with exposed paddle
Applications
  • Cable modems (CM)
  • Customer premises equipment (CPE)
  • DOCSIS 3.1 upstream (D3.1 US)

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